Changes

Revision History and Change Log

The changes in each Verilator version are described below. The contributors that suggested a given feature are shown in []. Thanks!

Verilator 5.009 devel

Minor:

• Add --public-depth to force public to a certain instance depth (#3952). [Andrew Nolte]
• Add --public-params flag (#3990). [Andrew Nolte]
• Add STATICVAR warning and convert to automatic (#4018) (#4027) (#4030). [Ryszard Rozak, Antmicro Ltd]
• Support class extends of package::class.
• Support method calls without parenthesis (#4034). [Ryszard Rozak, Antmicro Ltd]
• Support complicated IEEE 'for' assignments.
• Support $fopen as an expression.
• Change range order warning from LITENDIAN to ASCRANGE (#4010). [Iztok Jeras]
• Change ZERODLY to a warning.
• Fix random internal crashes (#666). [Dag Lem]
• Fix install, standardization in cmake CMakeLists.txt (#3974). [Yu-Sheng Lin]
• Fix UNDRIVEN warning seg fault (#3989). [Felix Neumärker]
• Fix symbol entries when inheriting classes (#3995) (#3996). [Krzysztof Boroński]
• Fix event controls reusing same variable (#4014). Kamil Rakoczy <[email protected]>
• Fix push to dynamic queue in struct (#4015). [ezchi]
• Fix names for blocks in do..while loop (#4019). [Ryszard Rozak, Antmicro Ltd]
• Fix randomize on null field (#4023). [Ryszard Rozak, Antmicro Ltd]
• Fix rand fields in base classes (#4025). [Ryszard Rozak, Antmicro Ltd]
• Fix large return blocks with --comp-limit-blocks (#4028). [tenghtt]
• Fix clocking block scope internal error (#4032). [Srinivasan Venkataramanan]
• Fix false LATCH warning on --assert 'unique else if' (#4033) ($4054). [Jesse Taube]
• Fix characters from DEFENV literals for conda (#4035) (#4044). [Tim Snyder]
• Fix false ENUMVALUE on expressions and arrays.

Verilator 5.008 2023-03-04

Minor:

• Add --annotate-points option, change multipoint on line reporting (#3876). [Nassim Corteggiani]
• Add --verilate-jobs option (#3889). [Kamil Rakoczy, Antmicro Ltd]
• Add WIDTHEXPAND and WIDTHTRUNC warnings to replace WIDTH (#3900). [Andrew Nolte]
• Add SOURCE_DATE_EPOCH for docs/guide/conf.py (#3918). [Larry Doolittle]
• Add /verilator public[flat|flat_rd|flat_rw| ]/ metacomments (#3894). [Joseph Nwabueze]
• Add lint warning on always_comb multidriven (#3888) (#3939). [Adam Bagley]
• Add warning on ++/-- over expressions with potential side effects (#3976). [Krzysztof Boroński]
• Add error on mixing .name and by-port instantiations.
• Removed deprecated --cdc option.
• Support unpacked unions.
• Support interface classes and class implements.
• Support global clocking and $global_clock.
• Support class parameters without initial values.
• Support cast to numbers from strings.
• Support struct I/O in --lib-create (#3378) (#3892). [Varun Koyyalagunta]
• Support function calls without parenthesis (#3903) (#3902). [Ryszard Rozak, Antmicro Ltd]
• Support class extending its parameter (#3904). [Ryszard Rozak, Antmicro Ltd]
• Support static function variables (#3830). [Ryszard Rozak, Antmicro Ltd]
• Support recursive methods (#3987). [Ryszard Rozak, Antmicro Ltd]
• Fix real parameters of infinity and NaN.
• Fix pattern assignment to unpacked structs (#3510). [Mostafa Garnal]
• Fix single-element replication to dynarray/unpacked/queue (#3548). [Gustav Svensk]
• Fix constant enum methods (#3621). [Todd Strader]
• Fix inconsistent naming of generate scope arrays (#3840). [Andrew Nolte]
• Fix namespace fallback resolution (#3863) (#3942). [Aleksander Kiryk, Antmicro Ltd]
• Fix std:: to be parsed first (#3864) (#3928). [Aleksander Kiryk, Antmicro Ltd]
• Fix cmake warning if multiple SOURCES w/o PREFIX (#3916) (#3927). [Yoda Lee]
• Fix parameterized class function linkage (#3917). [Ryszard Rozak]
• Fix static members of type aliases of a parameterized class (#3922). [Ryszard Rozak, Antmicro Ltd]
• Fix class extend parameter dot case (#3926). [Ryszard Rozak, Antmicro Ltd]
• Fix MsWin missing directory exception, and ::std (#3928) (#3933) (#3935). [Kritik Bhimani]
• Fix very long VPI signal names (#3929). [Marlon James]
• Fix VPI upper interface scopes not found (#3937). [David Stanford]
• Fix virus detection false positive (#3944). [Stuart Morris]
• Fix constant string function assignment (#3945). [Todd Strader]
• Fix constant format field widths (#3946). [Todd Strader]
• Fix class field linking when a super classes is a param (#3949). [Ryszard Rozak, Antmicro Ltd]
• Fix CMake bad C identifiers (#3948) (#3951). [Zixi Li]
• Fix build on HP PA architecture (#3954). [John David Anglin]
• Fix date on the front page of verilator.pdf (#3956) (#3957). [Larry Doolittle]
• Fix associative arrays declared with ref type (#3960). [Ryszard Rozak, Antmicro Ltd]
• Fix missing error on negative replicate (#3963). [Benjamin Menküc]
• Fix self references to parameterized classes (#3962). [Ryszard Rozak, Antmicro Ltd]
• Fix LITENDIAN warning is backwards (#3966) (#3967). [Cameron Kirk]
• Fix subsequent parameter declarations (#3969). [Ryszard Rozak, Antmicro Ltd]
• Fix timing delays to not truncate below 64 bits (#3973) (#3982). [Felix Neumärker]
• Fix cmake on MacOS to mark weak symbols with -U linker flag (#3978) (#3979). [Peter Debacker]
• Fix UNDRIVEN warning seg fault (#3989). [Felix Neumärker]
• Fix coverage of class methods (#3998). [Tim Paine]
• Fix packed array structure replication.
• Fix enum.next(0) and enum.prev(0).

Verilator 5.006 2023-01-22

Minor:

• Support clocking blocks (#3674). [Krzysztof Bieganski, Antmicro Ltd]
• Support packed structs (#3802). [Aleksander Kiryk, Antmicro Ltd]
• Support Windows-native builds using cmake (#3814). [Kritik Bhimani]
• Support p format for UnpackArray (#3877). [Aleksander Kiryk, Antmicro Ltd]
• Support property calls without parenthesis (#3879) (#3893). [Ryszard Rozak, Antmicro Ltd]
• Support import/export lists in modport (#3886). [Gökçe Aydos]
• Support class queue equality (#3895). [Ilya Barkov]
• Support type case and type equality comparisons.
• Add IMPLICITSTATIC warning when a task/function is implicitly static (#3839). [Ryszard Rozak, Antmicro Ltd]
• Add VL_VALUE_STRING_MAX_WORDS override (#3869). [Andrew Nolte]
• Optimize expansion of extend operators.
• Internal multithreading tests. [Mariusz Glebocki, et al, Antmicro Ltd]
• Fix VPI one-time timed callbacks (#2778). [Marlon James, et al]
• Fix initiation of function variables (#3815). [Dan Gisselquist]
• Fix to zero possibly uninitialized bits in replications (#3815).
• Fix crash in DFT due to width use after free (#3817) (#3820). [Jevin Sweval]
• Fix signed/unsigned comparison compile warning (#3822). [Kamil Rakoczy]
• Fix OS-X weak symbols with -U linker flag (#3823). [Jevin Sweval]
• Fix wrong bit op tree optimization (#3824) (#3825). [Yutetsu TAKATSUKASA]
• Fix self references when param class instantiated (#3833). [Ryszard Rozak, Antmicro Ltd]
• Fix memory leak in V3Sched, etc. (#3834). [Geza Lore]
• Fix compatibility with musl libc / Alpine Linux (#3845). [Sören Tempel]
• Fix empty case items crash (#3851). [Rich Porter]
• Fix VL_CPU_RELAX on MIPS/Armel/s390/sparc (#3843) (#3891). [Kamil Rakoczy]
• Fix module parameter name collision (#3854) (#3855). [James Shi]
• Fix unpacked array expansion (#3861). [Joey Liu]
• Fix signed/unsigned parameter types (#3866). [James Shi]
• Fix chain call of abstract class constructor (#3868) (#3883). [Ilya Barkov]
• Fix to use same std in Verilator and Verilated compile (#3881). [Kamil Rakoczy, Antmicro Ltd]
• Fix foreach unnamedblk duplicate error (#3885). [Ilya Barkov]
• Fix elaboration of member selected classes (#3890). [Ilya Barkov]
• Fix mismatched widths in DFG (#3872). [Geza Lore, Yike Zhou]
• Fix lint for non-integral types in packed structs.
• Fix generate case with empty body statements.

Verilator 5.004 2022-12-14

Major:

• Support named properties (#3667). [Ryszard Rozak, Antmicro Ltd]
• Add ENUMVALUE warning when value misused for enum (#726) (#3777) (#3783).
• Deprecate --no-threads; use --threads 1 for single threaded (#3703). [Kamil Rakoczy, Antmicro Ltd]

Minor:

• Support std::semaphore and typed std::mailbox (#3708). [Krzysztof Bieganski, Antmicro Ltd]
• Support 'with' in unique, unique_index, min, max in queues (#3772). [Ryszard Rozak, Antmicro Ltd]
• Support events in VCD/FST traces (#3759). [Yves Mathieu]
• Support foreach loops on strings (#3760). [Ryszard Rozak, Antmicro Ltd]
• Support member selects in with clauses (#3775). [Ryszard Rozak, Antmicro Ltd]
• Support super.new calls (#3789). [Ryszard Rozak, Antmicro Ltd]
• Support randcase.
• Support pre_randomize and post_randomize.
• Support $timeunit and $timeprecision.
• Support assignment expressions.
• Change ENDLABEL from warning into an error.
• Internal AST improvements, also affect XML format (#3721). [Geza Lore]
• Deprecate verilated_fst_sc.cpp and verilated_vcd_sc.cpp.
• Disable stack size limit (#3706) (#3751). [Mariusz Glebocki]
• Add error when use --exe with --lib-create (#3785). [Yinan Xu]
• Fix jump handling in do while loops (#3731). [Ryszard Rozak, Antmicro Ltd]
• Fix 'with' clause handling in functions (#3739). [Ryszard Rozak, Antmicro Ltd]
• Fix CONTEXT compile error on MingW (#3741). [William D. Jones]
• Fix MSVC compiler errors (#3742) (#3746). [Kritik Bhimani]
• Fix CASEINCOMPLETE when covers all enum values (#3745) (#3782). [Guy-Armand Kamendje]
• Fix return type of $countbits functions to int (#3725). [Ryszard Rozak, Antmicro Ltd]
• Fix timing control in while-break loops (#3733) (#3769). [Ryszard Rozak, Antmicro Ltd]
• Fix return in constructors (#3734). [Ryszard Rozak, Antmicro Ltd]
• Fix missing UNUSED warnings with --coverage (#3736). [alejandro-castro-ortegon]
• Fix tracing parameters overridden with -G (#3723). [Iztok Jeras]
• Fix folding of LogAnd with non-bool operands (#3726). [Geza Lore]
• Fix DFG optimization issues (#3740) (#3771). [Geza Lore]
• Fix pre/postincrement operations (#3744) (#3756). [Ryszard Rozak, Antmicro Ltd]
• Fix cross-compile for MingW, Arm and RISC-V (#3752). [Miodrag Milanović]
• Fix $unit as base package for other packages (#3755). [Ryszard Rozak, Antmicro Ltd]
• Fix make jobserver with submakes (#3758). [Gus Smith]
• Fix to escape VERILATOR_ROOT file paths (#3764) (#3765). [Jiacheng Qian]
• Fix empty string literals converting to string types (#3774). [miree]
• Fix to remove $date from .vcd files (#3779). [Larry Doolittle]
• Fix missing user objects in --lib-create mode (#3780) (#3784). [Yinan Xu]
• Fix non-blocking assignments in forks (#3781) (#3800). [Krzysztof Bieganski, Antmicro Ltd]
• Fix forks without any delayed statements (#3792) (#3801). [Krzysztof Bieganski, Antmicro Ltd]
• Fix internal error in bit op tree optimization (#3793). [Yutetsu TAKATSUKASA]
• Fix lint_off EOFNEWLINE in .vlt files (#3796). [Andrew Nolte]
• Fix wait 0.
• Fix comparing ranged slices of unpacked arrays.

Verilator 5.002 2022-10-29

Major:

• This is a major new release.
• Require C++20 for the new --timing features. Upgrading to a C++20 or newer compiler is strongly recommended.
• Support the Active and NBA scheduling regions as defined by the SystemVerilog standard (IEEE 1800-2017 chapter 4). This means all generated clocks are now simulated correctly (#3278, #3384). [Geza Lore, Shunyao CAD]
• Support timing controls (delays, event controls in any location, wait statements) and forks. [Krzysztof Bieganski, Antmicro Ltd] This may require adding --timing or --no-timing. See docs for details.
• Introduce a new combinational logic optimizer (DFG), that can yield significant performance improvements on some designs. [Geza Lore, Shunyao CAD]
• Add --binary option as alias of --main --exe --build --timing (#3625). For designs where C++ was only used to make a simple no-I/O testbench, we recommend abandoning that C++, and instead letting Verilator build it with --binary (or --main).

Minor:

• Split UNUSED warning into genvar, param, and signal warnings (#3607). [Topa Topino]
• Support standalone 'this' in classes (#2594) (#3248) (#3675). [Arkadiusz Kozdra, Antmicro Ltd]
• Support tristate select/extend (#3604). [Ryszard Rozak, Antmicro Ltd>
• Support linting for top module interfaces (#3635). [Kanad Kanhere]
• Support virtual interfaces (#3654). [Arkadiusz Kozdra, Antmicro Ltd]
• Support class type params without defaults (#3693). [Krzysztof Bieganski, Antmicro Ltd]
• Support empty generate_regions (#3695). [mpb27]
• Support access to constructs inside type parameters (#3702). [Arkadiusz Kozdra, Antmicro Ltd]
• Add --dump-tree-dot to enable dumping Ast Tree .dot files (#3636). [Marcel Chang]
• Add --get-supported to determine what features are in Verilator.
• Add error on real edge event control.
• Fix false LATCH warning on 'unique if' (#3088). [Rachit Nigam]
• Fix cell assigning integer array parameters (#3299). [Michael Platzer]
• Fix LSB error on --hierarchical submodules (#3539). [danbone]
• Fix $display of fixed-width numbers (#3565). [Iztok Jeras]
• Fix foreach and pre/post increment in functions (#3613). [Nandu Raj]
• Fix linker errors in user-facing timing functions (#3657). [Krzysztof Bieganski, Antmicro Ltd]
• Fix null access on optimized-out fork statements (#3658). [Krzysztof Bieganski, Antmicro Ltd]
• Fix VPI inline module naming mismatch (#3690) (#3694). [Jiuyang Liu]
• Fix deadlock in timeprecision when using SystemC (#3707). [Kamil Rakoczy, Antmicro Ltd]
• Fix width mismatch on inside operator (#3714). [Alex Torregrosa]

Verilator 4.228 2022-10-01

Announcement:

• The next release is anticipated to premiere Verilator Version 5. Please consider beta-testing the github 'develop-v5' branch, which will soon merge into the github 'master' branch (#3383).

Minor:

• Support some IEEE signal strengths (#3601) (#3629). [Ryszard Rozak, Antmicro Ltd]
• Add --main to generate main() C++ (previously was experimental only).
• Add --build-jobs, and rework arguments for -j (#3623). [Kamil Rakoczy]
• Rename --bin to --build-dep-bin.
• Rename debug flags --dumpi-tree, --dumpi-graph, etc. [Geza Lore]
• Fix thread safety in SystemC VL_ASSIGN_SBW/WSB (#3494) (#3513). [Mladen Slijepcevic]
• Fix crash in gate optimization of circular logic (#3543). [Bill Flynn]
• Fix arguments in non-static method call (#3547) (#3582). [Gustav Svensk]
• Fix default --mod-prefix when --prefix is repeated (#3603). [Geza Lore]
• Fix calling trace() after open() segfault (#3610) (#3627). [Yu-Sheng Lin]
• Fix typedef'ed class conversion to Boolean (#3616). [Aleksander Kiryk]
• Fix Verilation speed when disabled warnings (#3632). [Kamil Rakoczy, Antmicro Ltd]

Verilator 4.226 2022-08-31

Minor:

• Add --future0 and --future1 options.
• Support class parameters (#2231) (#3541). [Arkadiusz Kozdra, Antmicro Ltd]
• Support wildcard index associative arrays (#3501). [Arkadiusz Kozdra, Antmicro Ltd]
• Support negated properties (#3572). [Aleksander Kiryk]
• Support $test$plusargs(expr) (#3489).
• Rename trace rolloverSize() (#3570).
• Improve Verilation speed with --threads on large designs. [Geza Lore]
• Improve Verilation memory by reducing V3Number (#3521). [Mariusz Glebocki, Antmicro Ltd]
• Fix struct pattern assignment (#2328) (#3517). [Mostafa Gamal]
• Fix public combo propagation issues (#2905). [Todd Strader]
• Fix incorrect tristate logic (#3399) [shareefj, Vighnesh Iyer]
• Fix incorrect bit op tree optimization (#3470). [algrobman]
• Fix bisonpre for MSYS2 (#3471).
• Fix max memory usage (#3483). [Kamil Rakoczy, Antmicro Ltd]
• Fix empty string arguments to display (#3484). [Grulfen]
• Fix table optimizing away display (#3488). [Stefan Post]
• Fix unique_ptr memory header for MinGW64 (#3493).
• Fix $dump system task with --output-split-cfuncs (#3495) (#3497). [Varun Koyyalagunta]
• Fix wrong bit op tree optimization (#3509). [Nathan Graybeal]
• Fix nested default assignment for struct pattern (#3511) (#3524). [Mostafa Gamal]
• Fix sformat string incorrectly cleared (#3515) (#3519). [Gustav Svensk]
• Fix segfault exporting non-existent package (#3535).
• Fix void-cast queue pop_front or pop_back (#3542) (#3364). [Drew Ranck]
• Fix case statement comparing string literal (#3544). [Gustav Svensk]
• Fix === with some tristate constants (#3551). [Ryszard Rozak, Antmicro Ltd]
• Fix converting classes to string (#3552). [Arkadiusz Kozdra, Antmicro Ltd]
• Fix --hierarchical with order-based pin connections (#3583) (#3585). [Kelin9298]

Verilator 4.224 2022-06-19

Major:

• VCD tracing is now parallelized with --threads (#3449). [Geza Lore, Shunyao CAD]

Minor:

• Add -f<optimization> options to replace -O<letter> options (#3436).
• Changed --no-merge-const-pool to -fno-merge-const-pool (#3436).
• Changed --no-decoration to remove output whitespace (#3460). [Kamil Rakoczy]
• Support compile time trace signal selection with tracing_on/off (#3323). [Shunyao CAD]
• Support non-ANSI interface port declarations (#3439). [Geza Lore, Shunyao CAD]
• Support concat assignment to packed array (#3446).
• Improve conditional merging optimization (#3125). [Geza Lore, Shunyao CAD]
• Define VM_TRACE_VCD when tracing in VCD format. [Geza Lore, Shunyao CAD]
• Add assert when VerilatedContext is mis-deleted (#3121). [Rupert Swarbrick]
• Internal prep work towards timing control. [Krzysztof Bieganski, Antmicro Ltd]
• Fix hang with large case statement optimization (#3405). [Mike Urbach]
• Fix UNOPTFLAT warning from initial static var (#3406). [Kamil Rakoczy]
• Fix compile error when enable VL_LEAK_CHECKS (#3411). [HungMingWu]
• Fix cmake rules to support higher-level targets (#3377) (#3386). [Martin Stadler]
• Fix BLKANDNBLK on $readmem/$writemem (#3379). [Alex Solomatnikov]
• Fix 'with' operator with type casting (#3387). [xiak95]
• Fix incorrect conditional merging (#3409). [Raynard Qiao]
• Fix passing VL_TRACE_FST_WRITER_THREAD in CMake build. [Geza Lore, Shunyao CAD]
• Fix compile error under strict C++11 mode (#3463). [Kevin Kiningham]
• Fix public unpacked input ports (#3465). [Todd Strader]

Verilator 4.222 2022-05-02

Minor:

• Split --prof-threads into --prof-exec and --prof-pgo (#3365). [Geza Lore, Shunyao CAD]
• Deprecate 'vluint64_t' and similar types (#3255).
• Raise error on assignment to const in initial blocks. [Geza Lore, Shunyao CAD]
• Issue INITIALDLY/COMBDLY/BLKSEQ warnings consistent with Verilator execution. [Geza Lore, Shunyao CAD]
• Support LoongArch ISA multithreading (#3353) (#3354). [Xi Zhang]
• Fix MSVC localtime_s (#3124).
• Fix Bison 3.8.2 error (#3366). [elike-ypq]
• Fix rare bug in -Oz (V3Localize) (#3286). [Geza Lore, Shunyao CAD]
• Fix tracing interfaces inside interfaces (#3309). [Kevin Millis]
• Fix filenames with dots overwriting debug .vpp files (#3373).
• Fix including VK_USER_OBJS in make library (#3370) (#3382). [Julien Margetts]
• Fix hang in generate symbol references (#3391) (#3398). [Yoda Lee]
• Fix missing #include <memory> (#3392). [Aliaksei Chapyzhenka]
• Fix crash in recursive module inlining (#3393). [david-sawatzke]
• Fix --protect-ids mangling names of library methods. [Geza Lore, Shunyao CAD]
• Fix foreach segmentation fault (#3400). [Kamil Rakoczy]

Verilator 4.220 2022-03-12

Minor:

• Removed the deprecated lint_off flag -msg; use -rule instead.
• Removed the deprecated "fl" attribute in XML output; use "loc" attribute instead.
• Suppress WIDTH warning on negate using carry bit (#3295). [Peter Monsson]
• Add trace dumpvars() call for selective runtime tracing (#3322). [Shunyao CAD]
• Add VERILATOR_VERSION_INTEGER for determining API (#3343). [Larry Doolittle]
• Improve various V3Combine algorithm details (#3328). [Yutetsu TAKATSUKASA]
• Improve various V3Order algorithm details. [Geza Lore]
• Fix MacOS arm64 build (#3285) (#3291). [Guokai Chen]
• Fix signed number operation (#3294) (#3308). [Raynard Qiao]
• Fix FST traces to include vector range (#3296) (#3297). [Jamie Iles]
• Fix skipping public enum values with four-state values (#3303).
• Fix $readmem file not found to be warning not error (#3310). [Alexander Grobman]
• Fix class stringification on wide arrays (#3312). [Iru Cai]
• Fix $fscanf etc to return -1 on EOF (#3313). [Jose Tejada]
• Fix public function arguments that are arrayed (#3316). [pawel256]
• Fix unnamedblk error on foreach (#3321). [Aliaksei Chapyzhenka]
• Fix crash in recursive module inlining (#3324). [Larry Doolittle]
• Fix VL_RESTORER behavior on passing a lvalue reference (#3326). [HungMingWu]
• Fix compile error with --trace-fst --sc (#3332). [leavinel]
• Fix cast to array types (#3333). [Todd Strader]
• Fix Vdeeptemp error with --threads and --compiler clang (#3338). [Per Karlsson]

Verilator 4.218 2022-01-17

Major:

• Primary inputs and outputs (VL_INW/VL_OUTW) now use VlWide type. In general this should be backward compatible, but may lead to some wrapper code needing changes.
• Option --cdc is deprecated and is planned for removal, file a bug if this is still being used.

Minor:

• Support class static members (#2233).
• Support force/release (#2431) (#2593). [Shunyao CAD]
• Add 'forceable' attribute to allow forcing from C++. (#3272). [Geza Lore, Shunyao CAD]
• Support lower dimension looping in foreach loops (#3172). [Ehab Ibrahim]
• Support up to 64 bit enums for .next/.prev/.name (#3244). [Alexander Grobman]
• Reduce .rodata footprint of trace initialization (#3250). [Geza Lore, Shunyao CAD]
• Support FST tracing in hierarchical Verilation (#3251). [Yutetsu TAKATSUKASA]
• Use C++11 standard types for MacOS portability (#3254) (#3257). [Adrien Le Masle]
• Fix make support for BSD ar (#2999) (#3256). [Julie Schwartz]
• Fix bad ending address on $readmem (#3205). [Julie Schwartz]
• Fix MSWIN compile error (#2681). [Unai Martinez-Corral]
• Fix break under foreach loop (#3230).
• Fix VL_STREAML_FAST_QQI with 64 bit left-hand-side (#3232) (#3235). [Adrien Le Masle]
• Fix $sformat of inputs/outputs (#3236). [Adrien Le Masle]
• Fix associative array first method as statement (#3228). [Adrien Le Masle]
• Fix associative array foreach loop (#3229).
• Fix $fclose not accepting expressions (#3237). [Julie Schwartz]
• Fix $random not updating seed (#3238). [Julie Schwartz]
• Fix top level param overwrite when package has same param (#3241) (#3247). [Adrien Le Masle]
• Fix spurious UNUSED by ignoring inout pin connections (#3242). [Julie Schwartz]
• Fix splitting of _eval and other top level functions. [Geza Lore, Shunyao CAD]
• Fix internal error by inout port (#3258). [Yutetsu TAKATSUKASA]
• Fix GCC 11 compile error (#3273). [HungMingWu]

Verilator 4.216 2021-12-05

Major:

• Add --lib-create, similar to --protect-lib but without protections.
• Support tracing through --hierarchical/--lib-create libraries (#3200).

Minor:

• Internal code cleanups and improvements. [Geza Lore]
• Improve --thread Verilation-time performance.
• Support task name in $display %m (#3211). [Julie Schwartz]
• Make 'bit', 'logic' and 'time' types unsigned by default. [Geza Lore]
• Optimize $random concatenates/selects (#3114).
• Fix array method names with parenthesis (#3181) (#3183). [Teng Huang]
• Fix split_var assign merging (#3177) (#3179). [Yutetsu TAKATSUKASA]
• Fix wrong bit op tree optimization (#3185). [Yutetsu TAKATSUKASA]
• Fix some SliceSels not being constants (#3186) (#3218). [Michaël Lefebvre]
• Fix nested generate if genblk naming (#3189). [yanx21]
• Fix hang on recursive definition error (#3199). [Jonathan Kimmitt]
• Fix display of signed without format (#3204). [Julie Schwartz]
• Fix display of empty string constant (#3207) (#3215). [Julie Schwartz]
• Fix incorrect width after and-or optimization (#3208). [Julie Schwartz]
• Fix $fopen etc on integer arrays (#3214). [adrienlemasle]
• Fix $size on dynamic strings (#3216).
• Fix %0 format on $value$plusargs (#3217).
• Fix timescale portability on Arm64 (#3222).

Verilator 4.214 2021-10-17

Major:

• Add profile-guided optimization of mtasks (#3150).

Minor:

• Verilator_gantt has removed the ASCII graphics, use the VCD output instead.
• Verilator_gantt now shows the predicted mtask times, eval times, and additional statistics.
• Verilator_gantt data files now include processor information, to allow later processing.
• Support displaying x and z in $display task (#3107) (#3109). [Iru Cai]
• Fix verilator_profcfunc profile accounting (#3115).
• Fix display has no time units on class function (#3116). [Damien Pretet]
• Fix removing if statement with side effect in condition (#3131). [Alexander Grobman]
• Fix --waiver-output for multiline warnings (#2429) (#3141). [Keith Colbert]
• Fix internal error on bad widths (#3140) (#3145). [Zhanglei Wang]
• Fix crash on clang 12/13 (#3148). [Kouping Hsu]
• Fix cygwin compile error due to missing -std=gnu++14 (#3149). [Sun Kim]
• Fix $urandom_range when the range is 0 ... UINT_MAX (#3161). [Iru Cai]
• Fix constructor-parameter argument comma-separation in C++ (#3162). [Matthew Ballance]
• Fix missing install of vl_file_copy/vl_hier_graph (#3165). [Popolon]
• Fix calling new with arguments in same class (#3166). [Matthew Ballance]
• Fix false EOFNEWLINE warning when DOS carriage returns present (#3171).

Verilator 4.212 2021-09-01

Minor:

• Fix re-evaluation of logic dependent on state set in DPI exports (#3091). [Geza Lore]
• Support unpacked array localparams in tasks/functions (#3078). [Geza Lore]
• Support timeunit/timeprecision in $unit.
• Support assignment patterns as children of pins (#3041). [Krzysztof Bieganski, Antmicro Ltd]
• Add --instr-count-dpi to tune assumed DPI import cost for multithreaded model scheduling. Default value changed to 200 (#3068). [Yinan Xu]
• Output files are split based on the set of headers required in order to aid incremental compilation via ccache (#3071). [Geza Lore]
• Parameter values are now emitted as 'static constexpr' instead of enum. C++ direct references to parameters might require updating (#3077). [Geza Lore]
• Refactored Verilated include files; include verilated.h not verilated_heavy.h.
• Add header guards on Dpi.h generated files (#2979). [Tood Strader]
• Add XML ccall, constpool, initarray, and if/while begins (#3080). [Steven Hugg]
• Add error when constant function under a generate (#3103). [Don Owen]
• Fix -G to treat simple integer literals as signed (#3060). [Anikin1610]
• Fix emitted string array initializers (#2895). [Iztok Jeras]
• Fix bitop tree optimization dropping necessary & operator (#3096). [Flavien Solt]
• Fix internal error on wide -x-initial unique (#3106). [Alexandre Joannou]
• Fix traces to show array instances with brackets (#3092) (#3095). [Pieter Kapsenberg]

Verilator 4.210 2021-07-07

Major:

• Generated code is now emitted as global functions rather than methods. '$c' contents might need to be updated, see the docs (#3006). [Geza Lore]
• The generated model class instantiated by the user is now an interface object and no longer the TOP module instance. User code with direct C++ member access to model internals, including verilator public_flat items will likely need to be updated. See the manual for instructions: https://verilator.org/guide/latest/connecting.html#porting-from-pre-4-210 (#3036). [Geza Lore]

Minor:

• Add --prof-c to pass profiling to compiler (#3059). [Alexander Grobman]
• Optimize a lot more model variables into function locals (#3027). [Geza Lore]
• Support middle-of-design nested top modules (#3026). [Dan Petrisko]
• Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
• Remove deprecated --inhibit-sim option (#3035). [Geza Lore]
• Merge const static data globally into a new constant pool (#3013). [Geza Lore]
• Allow configure override of AR program (#2999). [ahouska]
• In XML, show pinIndex information (#2877). [errae233]
• Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
• Fix type parameter specialization when struct names are same (#3055). [7FM]
• Improve speed of table optimization (-OA) pass. [Geza Lore]

Verilator 4.204 2021-06-12

Minor:

• Add 'make ccache-report' (#3011). [Geza Lore]
• Add --reloop-limit argument (#2943) (#2960). [Geza Lore]
• Add --expand-limit argument (#3005). [Julien Margetts]
• Add TRACE_THREADS to CMake (#2934). [Jonathan Drolet]
• Optimize large lookup tables to static data (#2925). [Geza Lore]
• Optimize reloop to accept constant index offsets (#2939). [Geza Lore]
• Split always blocks to better respect --output-split-cfuncs. [Geza Lore]
• Support ignoring "`pragma protect ..." (#2886). [Udi Finkelstein]
• Support --trace-fst for SystemC with CMake (#2927). [Jonathan Drolet]
• Update cmake latest C++ Standard Compilation flag (#2951). [Ameya Vikram Singh]
• Prep work towards better ccache hashing/performance. [Geza Lore]
• Fix assertion failure in bitOpTree optimization (#2891) (#2899). [Raynard Qiao]
• Fix DPI functions not seen as vpiModule (#2893). [Todd Strader]
• Fix bounds check in VL_SEL_IWII (#2910). [Krzysztof Bieganski, Antmicro Ltd]
• Fix slowdown in elaboration (#2911). [Nathan Graybeal]
• Fix initialization of assoc in assoc array (#2914). [myftptoyman]
• Fix make support for gmake 3.x (#2920) (#2921). [Philipp Wagner]
• Fix VPI memory access for packed arrays (#2922). [Todd Strader]
• Fix MCD close also closing stdout (#2931). [Alexander Grobman]
• Fix split procedures to better respect --output-split-cfuncs (#2942). [Geza Lore]
• Fix to emit 'else if' without nesting (#2944). [Geza Lore]
• Fix part select issues in LATCH warning (#2948) (#2938). [Julien Margetts]
• Fix to not emit empty files with low split limits (#2961). [Geza Lore]
• Fix merging of assignments in C++ code (#2970). [Rupert Swarbrick]
• Fix unused variable warnings (#2991). [Pieter Kapsenberg]
• Fix --protect-ids when using SV classes (#2994). [Geza Lore]
• Fix constant function calls with uninitialized value (#2995). [yanx21]
• Fix Makefiles to support Windows EXEEXT usage (#3008). [Miodrag Milanovic]

Verilator 4.202 2021-04-24

Major:

• Documentation has been rewritten into a book format.
• Verilated signals now use VlWide and VlPacked in place of C arrays.

Minor:

• Add an URL on warnings to point to the manual's description.
• Add EOFNEWLINE warning when missing a newline at EOF.
• Changed TIMESCALEMOD from error into a warning.
• Mark --no-relative-cfuncs as scheduled for deprecation.
• Add --coverage-max-width (#2853). [xuejiazidi]
• Add VerilatedCovContext::forcePerInstance (#2793). [Kevin Laeufer]
• Add FST SystemC tracing (#2806). [Alex Torregrosa]
• Add PINNOTFOUND warning in place of error (#2868). [Udi Finkelstein]
• Support overlaps in priority case statements (#2864). [Rupert Swarbrick]
• Support for null ports (#2875). [Udi Finkelstein]
• Fix class unpacked-array compile error (#2774). [Iru Cai]
• Fix scope types in FST and VCD traces (#2805). [Alex Torregrosa]
• Fix exceeding command-line ar limit (#2834). [Yinan Xu]
• Fix false $dumpfile warning on model save (#2834). [Yinan Xu]
• Fix --timescale-override not suppressing TIMESCALEMOD (#2838). [Kaleb Barrett]
• Fix false TIMESCALEMOD on generate-ignored instances (#2838). [Kaleb Barrett]
• Fix --output-split with class extends (#2839). [Iru Cai]
• Fix false WIDTHCONCAT on casted constant (#2849). [Rupert Swarbrick]
• Fix tracing of long hashed names (#2854). [Graham Rushton]
• Fix --public-flat-rw / DPI issue (#2858). [Todd Strader]
• Fix interface localparam access (#2859). [Todd Strader]
• Fix Cygwin example compile issues (#2856). [Mark Shaw]
• Fix select of with index variable (#2880). [Alexander Grobman]
• Fix cmake version number to be numeric (#2881). [Yuri Victorovich]
• Fix MinGW not supporting 'localtime_r' (#2882). [HyungKi Jeong]
• Fix cast from packed, typedef'ed interface signal (#2884). [Todd Strader]
• Fix VPI package reported as vpiModule (#2885). [Todd Strader]
• Fix dumping waveforms to multiple FST files (#2889). [David Metz]
• Fix assertion failure in bitOpTree (#2892). [Yutetsu TAKATSUKASA]
• Fix V3Premit infinite loop on always read-and-write (#2898). [Raynard Qiao]
• Fix VPI packed vectors (#2900). [Todd Strader]
• Fix VPI public interface parameters (#2901). [Todd Strader]

Verilator 4.200 2021-03-12

Announcement:

• --inhibit-sim is planned for deprecation, file a bug if this is still being used.

Major:

• Add simulation context (VerilatedContext) to allow multiple fully independent models to be in the same process. Please see the updated examples. (#2660)
• Add context->time() and context->timeInc() API calls, to set simulation time. These now are recommended in place of the legacy sc_time_stamp().

Minor:

• Converted Asciidoc documentation into reStructuredText (RST) format.
• Fix range inheritance on port without data type (#2753). [Embedded Go]
• Fix slice-assign overflow (#2803) (#2811). [David Turner]
• Fix interface array connection ordering broken in v4.110 (#2827). [Don Owen]
• Fix or-reduction on different scopes broken in 4.110 (#2828). [Yinan Xu]
• Fix MSVC++ compile error. (#2831) (#2833) [Drew Taussig]

Verilator 4.110 2021-02-25

Major:

• Optimize bit operations and others (#2186) (#2632) (#2633) (#2751) (#2800) [Yutetsu TAKATSUKASA]

Minor:

• Support concat selection (#2721).
• Support struct scopes when dumping structs to VCD (#2776) [Alex Torregrosa]
• Generate SELRANGE for potentially unreachable code (#2625) (#2754) [Pierre-Henri Horrein]
• For --flatten, override inlining of public and no_inline modules (#2761) [James Hanlon]
• Fix little endian interface pin swizzling (#2475). [Don Owen]
• Fix range inheritance on port without data type (#2753). [Embedded Go]
• Fix TIMESCALE warnings on primitives (#2763). [Xuanqi]
• Fix to exclude strings from toggle coverage (#2766) (#2767) [Paul Wright]
• Fix $fread extra semicolon inside statements. [Leendert van Doorn]
• Fix class extends with VM_PARALLEL_BUILDS (#2775). [Iru Cai]
• Fix shifts by > 32 bit values (#2785). [qrq992]
• Fix examples not flushing vcd (#2787). [Richard E George]
• Fix little endian packed array pattern assignment (#2795). [Alex Torregrosa]

Verilator 4.108 2021-01-10

Major:

• Many VPI changes for IEEE compatibility, which may alter behavior from previous releases.
• Support randomize() class method and rand (#2607). [Krzysztof Bieganski, Antmicro Ltd]

Minor:

• Support $cast and new CASTCONST warning.
• Add --top option as alias of --top-module.
• Add LATCH and NOLATCH warnings (#1609) (#2740). [Julien Margetts]
• Remove Unix::Processors internal test dependency.
• Report UNUSED on parameters, localparam and genvars (#2627). [Charles Eric LaForest]
• Add error on real to non-real output pins (#2690). [Peter Monsson]
• Support package imports before parameters in interfaces (#2714). [James Hanlon]
• Support --sanitize in internal tests (#2705). [Yutetsu TAKATSUKASA]
• Fix passing parameter type instantiations by position number.
• Fix DPI open array handling issues.
• Fix error when dotted refers to missing module (#2095). [Alexander Grobman]
• Fix little endian packed array counting (#2499). [phantom-killua]
• Fix showing reference locations for BLKANDNBLK (#2170). [Yuri Victorovich]
• Fix genblk naming to match IEEE (#2686). [tinshark]
• Fix VPI memory word indexing (#2695). [Marlon James]
• Fix vpiLeftRange on little-endian memories (#2696). [Marlon James]
• Fix VPI module tree (#2704). [Todd Strader]
• Fix vpi_release_handle to be called implicitly per IEEE (#2706).
• Fix to allow inheriting 'VerilatedVcdFile' class. (#2720) [HyungKi Jeong]
• Fix $urandom_range maximum value (#2723). [Nandu Raj]
• Fix tracing empty sc module (#2729).
• Fix generate for unrolling to be signed (#2730). [yanx21]
• Fix to emit timescale in hierarchical blocks (#2735). [Yutetsu TAKATSUKASA]
• Fix to ignore coverage on real ports (#2741) (#2745). [Paul Wright]

Verilator 4.106 2020-12-02

Major:

• Change -sv option to select 1800-2017 instead of 1800-2005.

Minor:

• Check for proper 'local' and 'protected' (#2228).
• Support $random and $urandom seeds.
• Support $monitor and $strobe.
• Support complex function arguments.
• Support 'super'.
• Support 'with item.index'.
• Fix the default GNU Make executable name on FreeBSD (#2553). [Yuri Victorovich]
• Fix trace signal names getting hashed (#2643). [Barbara Gigerl]
• Fix unpacked array parameters near functions (#2639). [Anderson Ignacio da Silva]
• Fix access to non-overridden base class variable (#2654). [Tobias Rosenkranz]

Verilator 4.104 2020-11-14

Minor:

• Support queue and associative array 'with' statements (#2616).
• Support queue slicing (#2326).
• Support associative array pattern assignments and defaults.
• Support static methods and typedefs in classes (#2615). [Krzysztof Bieganski, Antmicro Ltd]
• Add error on typedef referencing self (#2539). [Cody Piersall]
• With --debug, turn off address space layout randomization.
• Fix iteration over mutating list bug in VPI (#2588). [Kaleb Barrett]
• Fix cast width propagation (#2597). [flex-liu]
• Fix return from callValueCbs (#2589) (#2605). [Marlon James]
• Fix WIDTH warnings on comparisons with nullptr (#2602). [Rupert Swarbrick]
• Fix fault when $fgets, $sscanf, etc used with string (#2604). [Yutetsu TAKATSUKASA]
• Fix WIFEXITED missing from MinGW/MSYS2 (#2609). [Jean Berniolles]
• Fix queue poping wrong value when otherwise unused (#2512). [nanduraj1]
• Fix arrays of modport interfaces (#2614). [Thierry Tambe]
• Fix split_var internal error (#2640) (#2641). [Yutetsu TAKATSUKASA]

Verilator 4.102 2020-10-15

Minor:

• Support const object new() assignments.
• Support # as a comment in -f files (#2497). [phantom-killua]
• Support 'this' (#2585). [Rafal Kapuscik]
• Support defines for FST tracing (#2592). [Markus Krause]
• Support non-overlapping implication inside properties (#1292). [Peter Monsson]
• Fix timescale with --hierarchical (#2554). [Yutetsu TAKATSUKASA]
• Fix cmake build with --hierarchical (#2560). [Yutetsu TAKATSUKASA]
• Fix -G dropping public indication (#2561). [Andrew Goessling]
• Fix $urandom_range passed variable (#2563). [nanduraj1]
• Fix method calls to package class functions (#2565). [Peter Monsson]
• Fix class wide member display (#2567). [Nandu Raj P]
• Fix hierarchical references inside function (#2267) (#2572). [James Pallister]
• Fix flushCall for backward compatibility (#2580). [chenguokai]
• Fix preprocessor stringify of undefined macro. [Martin Whitaker]

Verilator 4.100 2020-09-07

Major:

• C++11 or newer compilers are now required.
• SystemC 2.3.0 or newer (SYSTEMC_VERSION >= 20111121) is now required.
• Support hierarchical Verilation (#2206). [Yutetsu TAKATSUKASA]

Minor:

• Support (with limitations) class extern, class extends, virtual class.
• Support $urandom, $urandom_range without stability.
• Support assume property. [Peter Monsson]
• Support non-overlapping implication inside properties (#1292). [Peter Monsson]
• Fix false DECLFILENAME on black-boxed modules (#2430). [Philipp Wagner]
• Fix naming of "id : begin" blocks.
• Fix class constructor error on assignments to const.
• Fix splitting eval functions with --output-split-cfuncs (#2368). [Geza Lore]
• Fix queues as class members (#2525). [nanduraj1]

Verilator 4.040 2020-08-15

Announcement:

• Version 4.040 is planned to be the final version that will support pre-C++11 compilers. Please move to C++11 or newer compilers.

Minor:

• Fix arrayed interfaces, broke in 4.038 (#2468). [Josh Redford]
• Support $stable, $rose and $fell. (#2148) (#2501) [Peter Monsson]
• Support simple function localparams (#2461). [James Hanlon]
• Miscellaneous parsing error changes towards UVM support.
• Fix arrayed interfaces (#2469). [Josh Redford]
• Fix protect lib VCS warning. (#2479) [Julien Margetts]
• Fix combining different-width parameters (#2484). [abirkmanis]
• Fix protect-lib without sequential logic (#2492). [Yutetsu TAKATSUKASA]
• Fix V3Unknown from running with flat XML output (#2494). [James Hanlon]
• Fix non-32 bit conversion to float (#2495). [dsvf]
• Fix casting non-self-determined subexpressions (#2493). [phantom-killua]
• Fix SystemC net names (#2500). [Edgar E. Iglesias]
• Fix build with Bison 3.7 and newer (#2505). [Rupert Swarbrick]
• Fix slice of unpacked array (#2506) (#2507). [Yutetsu TAKATSUKASA]

Verilator 4.038 2020-07-11

Announcement:

• Versions 4.038 and 4.040 are planned to be the final versions that will support pre-C++11 compilers. Please move to C++11 or newer compilers.

Minor:

• Support VPI access to parameters and localparam. [Ludwig Rogiers]
• Support parsing (not elaboration, yet) of UVM.
• Add new UNSUPPORTED error code to replace most previous Unsupported: messages.
• With --bbox-unsup continue parsing on many (not all) UVM constructs.
• Support for-loop increments with commas.
• Support $swrite with arbitrary arguments.
• Support $writememb (#2450). [Fan Shupei]
• Fix OS X, Free BSD, and -m32 portability issues. [Geza Lore]
• Fix to flush FST trace on termination due to $stop or assertion failure.
• Fix part select error when multipling by power-of-two (#2413). [Conor McCullough]
• Fix division exception (#2460) [Kuoping Hsu]

Verilator 4.036 2020-06-06

Major:

• OPT_FAST is now -Os by default. See the BENCHMARKING & OPTIMIZATION part of the manual if you experience issues with compilation speed.
• --output-split is now on by default. VM_PARALLEL_BUILDS is set by default iff the --output-split caused an actual file split to occur. --output-split-cfuncs and --output-split-ctrace now default to the value of --output-split. These changes should improve build times of medium and large designs with default options. User makefiles may require changes.

Minor:

• Configure now enables SystemC if it is installed as a system headers, e.g. with 'apt-get install systemc-dev'.
• Add --waiver-output flag that writes a verilator config file (.vlt) with waivers to the warnings emitted during a Verilator run.
• Support verilator_coverage --write-info for lcov HTML reports.
• Line Coverage now tracks all statement lines, not just branch lines.
• The run-time library is now compiled with -Os by default. (#2369, #2373)
• Support multi channel descriptor I/O (#2190) [Stephen Henry]
• Support $countbits. (#2287) [Yossi Nivin]
• Support $isunbounded and parameter $. (#2104)
• Support unpacked array .sum and .product.
• Support prefix/postfix increment/decrement. (#2223) [Maciej Sobkowski]
• Fix FST tracing of little bit endian signals. [Geza Lore]
• Fix +: and -: on unpacked arrays. (#2304) [engr248]
• Fix $isunknown with constant Z's.
• Fix queues and dynamic array wide ops. (#2352) [Vassilis Papaefstathiou]

Verilator 4.034 2020-05-03

Major:

• Support simplistic classes with many restrictions, see manual. (#377)
• Support IEEE time units and time precisions. (#234) Includes `timescale, $printtimescale, $timeformat. VL_TIME_MULTIPLIER, VL_TIME_PRECISION, VL_TIME_UNIT have been removed and the time precision must now match the SystemC time precision. To get closer behavior to older versions, use e.g. --timescale-override "1ps/1ps".
• Add --build to call make automatically. (#2249) [Yutetsu TAKATSUKASA]
• Configuring with ccache present now defaults to using it; see OBJCACHE.
• Fix DPI import/export to be standard compliant. (#2236) [Geza Lore]
• Add --trace-threads for general multithreaded tracing. (#2269) [Geza Lore]

Minor:

• Add --flatten for use with --xml-only. (#2270) [James Hanlon]
• Greatly improve FST/VCD dump performance (#2244) (#2246) (#2250) (#2257) [Geza Lore]
• Support $ferror, and $fflush without arguments. (#1638)
• Support event data type (with some restrictions).
• Support $root. (#2150) [Keyi Zhang]
• Add error if use SystemC 2.2 and earlier (pre-2011) as is deprecated.
• Add support of --trace-structs for CMake (#2986). [Martin Schmidt]
• Fix arrayed instances connecting to slices. (#2263) [Don/engr248]
• Fix error on unpacked connecting to packed. (#2288) [Joseph Shaker]
• Fix logical not optimization with empty begin. (#2291) [Baltazar Ortiz]
• Fix reduction OR on wide data, broke in v4.026. (#2300) [Jack Koenig]
• Fix clock enables with bit-extends. (#2299) [Marco Widmer]
• Fix MacOs Homebrew by removing default LIBS. (#2298) [Ryan Clarke]

Verilator 4.032 2020-04-04

Minor:

• Add column numbers to errors and warnings.
• Add GCC 9-style line number prefix when showing source text for errors.
• Add setting VM_PARALLEL_BUILDS=1 when using --output-split. (#2185)
• Change --quiet-exit to also suppress 'Exiting due to N errors'.
• Suppress REALCVT for whole real numbers.
• Support split_var in vlt files. (#2219) [Marco Widmer]
• Fix parameter type redeclaring a type. (#2195) [hdzhangdoc]
• Fix VCD open with empty filename. (#2198) [Julius Baxter]
• Fix packages as enum base types. (#2202) [Driss Hafdi]
• Fix duplicate typedefs in generate for. (#2205) [hdzhangdoc]
• Fix MinW portability. (#2114) [Sean Cross]
• Fix assertions with unique case inside. (#2199) [hdzhangdoc]
• Fix implicit conversion of floats to wide integers.

Verilator 4.030 2020-03-08

Major:

• Add split_var metacomment to assist UNOPTFLAT fixes. (#2066) [Yutetsu TAKATSUKASA]
• Support $dumpfile and $dumpvars. (#2126) [Alexander Grobman]
• Support dynamic arrays. (#379)

Minor:

• Add +verilator+noassert flag to disable assertion checking. [Tobias Wölfel]
• Add check for assertOn for asserts. (#2162) [Tobias Wölfel]
• Add --structs-packed for forward compatibility.
• Support $displayb/o/h, $writeb/o/h, etc. (#1637)
• Use gcc -Os in examples instead of -O2 for better average performance.
• Fix genblk naming with directly nested generate blocks. (#2176) [Alexander Grobman]
• Fix undeclared VL_SHIFTR_WWQ. (#2114) [Alex Solomatnikov]

Verilator 4.028 2020-02-08

Major:

• Support attributes (public, isolate_assignments, etc.) in configuration files.
• Add -match to lint_off to waive warnings. [Philipp Wagner]

Minor:

• Link Verilator binary partially statically. (#2146) [Geza Lore]
• Verilation speed improvements (#2133) (#2138) [Geza Lore]
• Support libgoogle-perftools-dev's libtcmalloc if available. (#2137) [Geza Lore]
• Support $readmem/$writemem with assoc arrarys. (#2100) [agrobman]
• Support type(expression) operator and $typename. (#1650)
• Support left justified $display. (#2101) [Pieter Kapsenberg]
• Support string character access via indexing.
• Support enum.next(k) with constant k > 1. (#2125) [Tobias Rosenkranz]
• Support parameter access from arrays of interfaces. (#2155) [Todd Strader]
• Add parameter values in XML. #2110. [Pieter Kapsenberg]
• Add loc column location in XML (replaces fl). (#2122) [Pieter Kapsenberg]
• Add error on misused define. [Topa Tota]
• Add parameter to set maximum signal width. (#2082) [Øyvind Harboe]
• Add warning on genvar in normal for loop. (#2143) [Yuri Victorovich]
• Fix VPI scope naming for public modules. [Nandu Raj]
• Fix FST tracing of enums inside structs. [fsiegle]
• Fix WIDTH warning on </<= of narrower value. (#2141) [agrobman]
• Fix OpenSolaris issues. (#2154) [brancoliticus]
• Fix gated clocks under --protect-lib. (#2169) [Todd Strader]

Verilator 4.026 2020-01-11

Major:

• Docker images are now available for Verilator releases.

Minor:

• Support bounded queues.
• Support non-overlapping implication operator in assertions. (#2069) [Peter Monsson]
• Support string compare, ato*, etc methods. (#1606) [Yutetsu TAKATSUKASA]
• Support immediate cover statements.
• Ignore `uselib to end-of-line. (#1634) [Frederic Antonin]
• Update FST trace API for better performance.
• Add vpiTimeUnit and allow to specify time as string. (#1636) [Stefan Wallentowitz]
• Add error when `resetall inside module (IEEE 2017-22.3).
• Add cleaner error on version control conflicts in sources.
• Fix little endian cell ranges. (#1631) [Julien Margetts]
• Fix queue issues (#1641) (#1643) [Peter Monsson, Stefan Wallentowitz]
• Fix strcasecmp for windows. (#1651) [Kuba Ober]
• Fix disable iff in assertions. Closes #1404. [Peter Monsson]
• Fix huge case statement performance. Closes #1644. [Julien Margetts]
• Fix tracing -1 index arrays. Closes #2090. [Yutetsu Takatsukasa]
• Fix expand optimization slowing --lint-only. Closes #2091. [Thomas Watts]
• Fix %{number}s with strings. #2093. [agrobman]
• Fix shebang breaking some shells. Closes #2067. [zdave]

Verilator 4.024 2019-12-08

Major:

• Support associative arrays (excluding [*] and pattern assignments). (#544)
• Support queues (excluding {} notation and pattern assignments). (#545)

Minor:

• Add +verilator+error+limit to see more assertion errors. [Peter Monsson]
• Support string.toupper and string.tolower.
• Support $rewind and $ungetc.
• Support shortreal as real, with a SHORTREAL warning.
• Add -Wpedantic and -Wno-context for compliance testing.
• Add error on redefining preprocessor directives. [Piotr Binkowski]
• Support $value$plusargs float and shorts. (#1592) (#1619) [Garrett Smith]
• Fix gate lvalue optimization error. (#831) [Jonathon Donaldson, Driss Hafdi]
• Fix color assertion on empty if. (#1604) [Andrew Holme]
• Fix for loop missing initializer. (#1605) [Andrew Holme]
• Fix hang on concat error. (#1608) [Bogdan Vukobratovic]
• Fix VPI timed callbacks to be one-shot, pull5. [Matthew Ballance]
• Fix // in filenames. (#1610) [Peter Nelson]
• Fix $display("%p") to be closer to IEEE.
• Fix labels on functions with returns. (#1614) [Mitch Hayenga]
• Fix false unused message on __Vemumtab. (#2061) [Tobias Rosenkranz]
• Fix assertion on dotted parameter arrayed function. (#1620) [Rich Porter]
• Fix interface reference tracing. (#1595) [Todd Strader]
• Fix error on unpacked concatenations. (#1627) [Driss Hafdi]

Verilator 4.022 2019-11-10

Major:

• Add --protect-lib. (#1490) [Todd Strader]
• Add cmake support. (#1363) [Patrick Stewart]

Minor:

• Examples have been renamed.
• Add --protect-ids to obscure information in objects. (#1521) [Todd Strader]
• Add --trace-coverage.
• Add --xml-output.
• Support multithreading on Windows. [Patrick Stewart]
• Suppress 'command failed' on normal errors.
• Support some unpacked arrays in parameters. (#1315) [Marshal Qiao]
• Add interface port visibility in traces. (#1594) [Todd Strader]
• Increase case duplicate/incomplete to 16 bit tables. (#1545) [Yossi Nivin]
• Support quoted arguments in -f files. (#1535) [Yves Mathieu]
• Optimize modulus by power-of-two constants, and masked conditionals.
• Fix detecting missing reg types. (#1570) [Jacko Dirks]
• Fix multithreaded yield behavior when no work. [Patrick Stewart]
• Fix bad-syntax crashes. (#1548, #1550-#1553, #1557-#1560, #1563, #1573-#1577, #1579, #1582-#1591) [Eric Rippey]
• Fix false CMPCONST/UNSIGNED warnings on "inside". (#1581) [Mitch Hayenga]

Verilator 4.020 2019-10-06

Minor:

• Add --public-flat-rw. (#1511) [Stefan Wallentowitz]
• Support $fseek, $ftell, $frewind. (#1496) [Howard Su]
• Support vpiModule. (#1469) [Stefan Wallentowitz]
• Make Syms file honor --output-split-cfuncs. (#1499) [Todd Strader]
• Fix make test with no VERILATOR_ROOT. (#1494) [Ahmed El-Mahmoudy]
• Fix error on multidimensional cells. (#1505) [Anderson Ignacio Da Silva]
• Fix config_rev revision detection on old versions.
• Fix false warning on backward indexing. (#1507) [Hao Shi]
• Fix vpiType accessor. (#1509) (#1510) [Stefan Wallentowitz]
• Fix ugly error on interface misuse. (#1525) [Bogdan Vukobratovic]
• Fix misc bad-syntax crashes. (#1529) (#1530) (#1531) (#1532) (#1533) [Eric Rippey]
• Fix case statements with strings. (#1536) [Philipp Wagner]
• Fix some coverage lost when multithreaded. (#2151)

Verilator 4.018 2019-08-29

Major:

• When showing an error, show source code and offer suggestions of replacements.
• When showing an error, show the instance location. (#1305) [Todd Strader]

Minor:

• Add --rr. (#1481) [Todd Strader]
• Change MULTITOP to warning to help linting, see manual.
• Add XSim support to driver.pl. (#1493) [Todd Strader]
• Add --dpi-hdr-only. (#1491) [Todd Strader]
• Show included-from filenames in warnings. (#1439) [Todd Strader]
• Fix elaboration time errors. (#1429) [Udi Finkelstein]
• Fix not reporting some duplicate signals/ports. (#1462) [Peter Gerst]
• Fix not in array context on non-power-of-two slices. (#2027) [Yu Sheng Lin]
• Fix system compile flags injection. [Gianfranco Costamagna]
• Fix enum values not being sized based on parent. (#1442) [Dan Petrisko]
• Fix internal error on gate optimization of assign. (#1475) [Oyvind Harboe]

Verilator 4.016 2019-06-16

Minor:

• Add --quiet-exit. (#1436) [Todd Strader]
• Error continuation lines no longer have %Error prefix.
• Support logical equivalence operator <->.
• Support VerilatedFstC set_time_unit. (#1433) [Pieter Kapsenberg]
• Support deferred assertions. (#1449) [Charles Eddleston]
• Mark infrequently called functions with GCC cold attribute.
• Fix sign-compare warning in verilated.cpp. (#1437) [Sergey Kvachonok]
• Fix fault on $realtime with %t. (#1443) [Julien Margetts]
• Fix $display with string without %s. (#1441) [Denis Rystsov]
• Fix parameter function string returns. (#1441) [Denis Rystsov]
• Fix invalid XML output due to special chars. (#1444) [Kanad Kanhere]
• Fix performance when mulithreaded on 1 CPU. (#1455) [Stefan Wallentowitz]
• Fix type and real parameter issues (#1427) (#1456) (#1458) [Todd Strader]
• Fix build error on MinGW. (#1460) [Richard Myers]
• Fix not reporting some duplicate signals. (#1462) [Peter Gerst]
• Fix --savable invalid C++ on packed arrays. (#1465) [Alex Chadwick]
• Fix constant function return of function var. (#1467) [Roman Popov]

Verilator 4.014 2019-05-08

Minor:

• Add --trace-fst-thread.
• Support '#' comments in $readmem. (#1411) [Frederick Requin]
• Support "'dx" constants. (#1423) [Udi Finkelstein]
• For FST tracing use LZ4 compression. [Tony Bybell]
• Add error when use parameters without value. (#1424) [Peter Gerst]
• Auto-extend and WIDTH warn on unsized X/Zs. (#1423) [Udi Finkelstein]
• Fix missing VL_SHIFTL errors. (#1412) (#1415) [Larry Lee]
• Fix MinGW GCC 6 printf formats. (#1413) [Sergey Kvachonok]
• Fix test problems when missing fst2vcd. (#1417) [Todd Strader]
• Fix GTKWave register warning. (#1421) [Pieter Kapsenberg]
• Fix FST enums not displaying. (#1426) [Danilo Ramos]
• Fix table compile error with multiinterfaces. (#1431) [Bogdan Vukobratovic]

Verilator 4.012 2019-03-23

Minor:

• Add +verilator+seed. (#1396) [Stan Sokorac]
• Support $fread. [Leendert van Doorn]
• Support void' cast on functions called as tasks. (#1383) [Al Grant]
• Add IGNOREDRETURN warning. (#1383)
• Report PORTSHORT errors on concat constants. (#1400) [Will Korteland]
• Fix VERILATOR_GDB being ignored. (#2017) [Yu Sheng Lin]
• Fix $value$plus$args missing verilated_heavy.h. [Yi-Chung Chen]
• Fix MSVC compile error. (#1406) [Benjamin Gartner]
• Fix maintainer test when no Parallel::Forker. (#1977) [Enzo Chi]
• Fix +1364-1995ext flags applying too late. (#1384) [Al Grant]

Verilator 4.010 2019-01-27

Minor:

• Removed --trace-lxt2, use --trace-fst instead.
• For --xml, add additional information. (#1372) [Jonathan Kimmitt]
• Add circular typedef error. (#1388) [Al Grant]
• Add unsupported for loops error. (#1986) [Yu Sheng Lin]
• Fix FST tracing of wide arrays. (#1376) [Aleksander Osman]
• Fix error when pattern assignment has too few elements. (#1378) [Viktor Tomov]
• Fix error when no modules in $unit. (#1381) [Al Grant]
• Fix missing too many digits warning. (#1380) [Jonathan Kimmitt]
• Fix uninitialized data in verFiles and unroller. (#1385) (#1386) [Al Grant]
• Fix internal error on xrefs into unrolled functions. (#1387) [Al Grant]
• Fix DPI export void compiler error. (#1391) [Stan Sokorac]

Verilator 4.008 2018-12-01

Minor:

• Support "ref" and "const ref" pins and functions. (#1360) [Jake Longo]
• In --xml-only show the original unmodified names, and add module_files and cells similar to Verilog-Perl, msg2719. [Kanad Kanhere]
• Add CONTASSREG error on continuous assignments to regs. (#1369) [Peter Gerst]
• Add PROCASSWIRE error on behavioral assignments to wires, msg2737. [Neil Turton]
• Add IMPORTSTAR warning on import::* inside $unit scope.
• Fix --trace-lxt2 compile error on MinGW. (#1990) [HyungKi Jeong]
• Fix hang on bad pattern keys. (#1364) [Matt Myers]
• Fix crash due to cygwin bug in getline. (#1349) [Affe Mao]
• Fix __Slow files getting compiled with OPT_FAST. (#1370) [Thomas Watts]

Verilator 4.006 2018-10-27

Minor:

• Add --pp-comments. (#1988) [Robert Henry]
• Add --dump-defines.
• For --trace-fst, save enum decoding information. (#1358) [Sergi Granell] (To visualize enumeration data you must use GTKwave 3.3.95 or newer.)
• For --trace-fst, combine hier information into FST. [Tony Bybell]
• Fix --trace-lxt2 compile error on MinGW, msg2667. [HyungKi Jeong]
• Fix Windows .exe not found. (#1361) [Patrick Stewart]

Verilator 4.004 2018-10-06

Major:

• Add GTKWave FST native tracing. (#1356) [Sergi Granell] (Verilator developers need to pull the latest vcddiff.)

Minor:

• Support $past. [Dan Gisselquist]
• Support restrict. (#1350) [Clifford Wolf]
• Rename include/lxt2 to include/gtkwave.
• Fix replication of 64-bit signal change detects.
• Fix Mac OSX 10.13.6 / LLVM 9.1 compile issues. (#1348) [Kevin Kiningham]
• Fix MinGW compile issues. (#1979) [HyungKi Jeong]

Verilator 4.002 2018-09-16

Major:

• This is a major release. Any patches may require major rework to apply. [Thanks everyone]
• Add multithreaded model generation.
• Add runtime arguments.
• Add GTKWave LXT2 native tracing. (#1333) [Yu Sheng Lin]
• Note $random has new algorithm; results may vary vs. previous versions.

Minor:

• Better optimize large always block splitting. (#1244) [John Coiner]
• Add new reloop optimization for repetitive assignment compression.
• Support string.atoi and similar methods. (#1289) [Joel Holdsworth]
• Fix internals to be C++ null-pointer-check clean.
• Fix internals to avoid 'using namespace std'.
• Fix Verilation performance issues. (#1316) [John Coiner]
• Fix clocker attributes to not propagate on concats. [John Coiner]
• Fix first clock edge and --x-initial-edge. (#1327) [Rupert Swarbrick]
• Fix compile error on tracing of string arrays. (#1338) [Iztok Jeras]
• Fix number parsing with newline after radix. (#1340) [George Cuan]
• Fix string ?: conditional type resolution. (#1345) [Iztok Jeras]
• Fix duplicate symbol error on generate tri. (#1347) [Tomas Dzetkulic]

Verilator 3.926 2018-08-22

Minor:

• Add OBJCACHE envvar support to examples and generated Makefiles.
• Change MODDUP errors to warnings. (#1969) [Marshal Qiao]
• Fix define argument stringification (`"), broke since 3.914. [Joe DErrico]
• Fix to ignore Unicode UTF-8 BOM sequences. (#1967) [HyungKi Jeong]
• Fix std:: build error. (#1322)
• Fix function inlining inside certain while loops. (#1330) [Julien Margetts]

Verilator 3.924 2018-06-12

Minor:

• Renamed --profile-cfuncs to --prof-cfuncs.
• Report interface ports connected to wrong interface. (#1294) [Todd Strader]
• When tracing, use scalars on single bit arrays to appease vcddiff.
• Fix parsing "output signed" in V2K port list, msg2540. [James Jung]
• Fix parsing error on bad missing #. (#1308) [Dan Kirkham]
• Fix $clog2 to be in verilog 2005. (#1319) [James Hutchinson]

Verilator 3.922 2018-03-17

Major:

• Support IEEE 1800-2017 as default language.

Minor:

• Support trig functions ($sin() etc). (#1281) [Patrick Stewart]
• Support calling system functions as tasks. (#1285) [Joel Holdsworth]
• Support assert properties. (#785) (#1290) [John Coiner, et al]
• Support $writememh. [John Coiner]
• Add --no-debug-leak to reduce memory use under debug. [John Coiner]
• Fix severe runtime performance bug in certain foreach loops. [John Coiner]
• On convergence errors, show activity. [John Coiner]
• Fix GCC 8.0 issues. (#1273)
• Fix pullup/pulldowns on bit selects. (#1274) [Rob Stoddard]
• Fix verilator_coverage --annotate-min. (#1284) [Tymoteusz Blazejczyk]
• Fix quoting of quoted arguments. [John Coiner]

Verilator 3.920 2018-02-01

Announcement:

• Moving forward, use the git "stable" branch to track the latest release, and git "v#.###" tags for specific releases.

Minor:

• Support 'assume' similar to 'assert'. (#1269) [Dan Gisselquist]
• Remove c++filt. (#1265) [Stefan Wallentowitz]
• Fix tracing example file output. (#1268) [Enzo Chi]
• Fix gate optimization out of memory, add --gate-stmts. (#1260) [Alex Solomatnikov]
• Fix compile error on public real parameters by suppressing. (#1261) [Alex Solomatnikov]
• Fix input-only tristate comparisons. (#1267) [Alexis G]
• Fix missing edge type in xml output. (#1955) [Alexis G]
• Fix compile error with --public and interface bind. (#1264) [Alexis G]

Verilator 3.918 2018-01-02

Minor:

• Workaround GCC/clang bug with huge compile times. (#1248)
• Support DPI open arrays. (#909) (#1245) [David Pierce, Victor Besyakov]
• Add INFINITELOOP warning. (#1254) [Alex Solomatnikov]
• Support > 64 bit decimal $display.
• Support DPI time and svLogicVal. [Victor Besyakov] Note older version incorrectly assumed svBitVal even for logicals.
• Support string len() method. [Victor Besyakov]
• Add error if always_comb has sensitivity list. [Arjen Roodselaar]
• Fix SystemC 2.3.2 compile error. (#1251) [Tymoteusz Blazejczyk]
• Fix modport outputs being treated as inputs. (#1246) [Jeff Bush]
• Fix false ALWCOMBORDER on interface references. (#1247) [Josh Redford]
• Fix constant propagation across DPI imports of inout strings. [Victor Besyakov]
• Fix resolving inline nested interface names. (#1250) [Arjen Roodselaar]
• Fix GCC false warning on array bounds. (#2386)

Verilator 3.916 2017-11-25

Minor:

• Support self-recursive modules. (#659) [Sean Moore, et al]
• Support $error/$warning in elaboration time blocks.
• Support $size/$bits/etc on type references.
• Add error when driving input-only modport. (#1110) [Trevor Elbourne]
• Add BSSPACE and COLONPLUS lint warnings.
• Detect MSB overflow when under VL_DEBUG. (#1238) [Junyi Xi]
• Add data types to --xml. [Rui Terra]
• Fix partial slicing with pattern assignments. (#991) [Johan Bjork]
• Fix false unused warning on interfaces. (#1241) [Laurens van Dam]
• Fix error on "unique case" with no cases.
• Fix MacOS portability. (#1232) [Jeff Bush]

Verilator 3.914 2017-10-14

Major:

• Add new examples/ directory with appropriate examples. This replaces the old test_c and test_sc directories.

Minor:

• Add --getenv option for simplifying Makefiles.
• Add --x-initial option for specifying initial value assignment behavior.
• Add --no-relative-cfuncs and related default optimization. (#1224) [John Coiner]
• Add /verilator tag/ for XML extraction applications. [Chris Randall]
• The internal test_verilated test directory is moved to be part of test_regress.
• The experimental VL_THREADED setting (only, not normal mode) now requires C++11.
• Fix over-aggressive inlining. (#1223) [John Coiner]
• Fix Ubuntu 17.10 issues. (#1223 partial). [John Coiner]
• Fix compiler warning when WIDTH warning ignored on large compare.
• Fix memory leak in VerilatedVcd dumps. (#1222 partial) [Shareef Jalloq]
• Fix unnecessary Vdly variables. (#1224 partial) [John Coiner]
• Fix conditional slices and add related optimizations.
• Fix `` expansion of `defines. (#1225) (#1227) (#1228) [Odd Magne Reitan]
• Fix -E duplicating output. (#1226) [Odd Magne Reitan]
• Fix float-conversion warning. (#1229) [Robert Henry]
• Fix MacOS portability. (#1230) (#1231) [Jeff Bush]

Verilator 3.912 2017-09-23

Major:

• Verilated headers no longer "use namespace std;" User's code without "std::" prefixes may need "use namespace std;" to compile.

Minor:

• Support or/and/xor array intrinsic methods. (#1210) [Mike Popoloski]
• Support package export. (#1217) [Usuario Eda]
• Support module port parameters without defaults. (#1213) [Mike Popoloski]
• Add performance information to --stats file.
• Simplify VL_CONST_W macro generation for faster compiles.
• Optimize improvements for Shift-And, and replication constructs.
• Fix ordering of arrayed cell wide connections. (#1202 partial) [Mike Popoloski]
• Fix LITENDIAN warning on arrayed cells. (#1202) [Mike Popoloski]
• Fix enum ranges without colons. (#1204) [Mike Popoloski]
• Fix GCC noreturn compile error. (#1209) [Mike Popoloski]
• Fix constant function default parameters. (#1211) [Mike Popoloski]
• Fix non-colon array of interface modports. (#1212) [Mike Popoloski]
• Fix .name connections on interfaces. (#1214) [Mike Popoloski]
• Fix wide array indices causing compile error.

Verilator 3.910 2017-09-07

Major:

• SystemPerl mode (-sp-deprecated) has been removed.

Minor:

• Update keyword warnings to include C++11 and others.

Verilator 3.908 2017-08-28

Minor:

• Support x in $readmem. (#1180) [Arthur Kahlich]
• Support packed struct DPI imports. (#1190) [Rob Stoddard]
• Fix GCC 6 warnings.
• Fix compile error on unused VL_VALUEPLUSARGS_IW. (#1181) [Thomas J Whatson]
• Fix undefined VL_POW_WWI. [Clifford Wolf]
• Fix internal error on unconnected inouts. (#1187) [Rob Stoddard]

Verilator 3.906 2017-06-22

Minor:

• Support set_time_unit/set_time_precision in C traces. (#1937)
• Fix extract of packed array with non-zero LSB. (#1172) [James Pallister]
• Fix shifts by more than 32-bit numbers. (#1174) [Clifford Wolf]
• Fix power operator on wide constants. (#761) [Clifford Wolf]
• Fix .* on interface pins. (#1176) [Maciej Piechotka]

Verilator 3.904 2017-05-30

Minor:

• Fix non-cutable ordering loops on clock arrays. (#1009) [Todd Strader]
• Support ports of array of reals. (#1154) [J Briquet]
• Support arrayed parameter overrides. (#1153) [John Stevenson]
• Support $value$plusargs with variables. (#1165) [Wesley Terpstra]
• Support modport access to un-modport objects. (#1161) [Todd Strader]
• Add stack trace when can't optimize function. (#1158) [Todd Strader]
• Add warning on mis-sized literal. (#1156) [Todd Strader]
• Fix interface functions returning wrong parameters. (#996) [Todd Strader]
• Fix non-arrayed cells with interface arrays. (#1153) [John Stevenson]
• Fix --assert with complex case statements. (#1164) [Enzo Chi]

Verilator 3.902 2017-04-02

Major:

• Add -FI option to force includes. (#1916) [Amir Gonnen]
• Add --relative-includes. [Rob Stoddard]

Minor:

• Add error on duplicate pattern assignments. (#1145) [Johan Bjork]
• Fix error on improperly widthed default function. (#984) [Todd Strader]
• Fix 2009 localparam syntax, msg2139. [Galen Seitz]
• Fix ugly interface-to-non-interface errors. (#1112) [Johan Bjork]
• Fix LDFLAGS and CFLAGS not preserving order. (#1130) [Olof Kindgren]
• Fix internal error on initializing parameter array. (#1131) [Jie Xu]
• Fix internal error on interface arrays. (#1135) [John Stevenson]
• Fix calling sformatf to display, and elab $displays. (#1139) [Johan Bjork]
• Fix realpath compile issue on MSVC++. (#1141) [Miodrag Milanovic]
• Fix missing error on interface size mismatch. (#1143) [Johan Bjork]
• Fix error on parameters with dotted references. (#1146) [Johan Bjork]
• Fix wreal not handling continuous assign. (#1150) [J Briquet]
• Fix nested structure parameter selects. (#1150) [J Briquet]

Verilator 3.900 2017-01-15

Major:

• Internal code changes for improved compatibility and performance.

Minor:

• Support old-style $display($time). (#467) [John Demme]
• With --bbox-unsup, suppress desassign and mixed edges. (#1120) [Galen Seitz]
• Fix parsing sensitivity with &&. (#934) [Luke Yang]
• Fix internal error on double-for loop unrolling. (#1044) [Jan Egil Ruud]
• Fix internal error on unique casez with --assert. (#1117) [Enzo Chi]
• Fix bad code when tracing array of structs. (#1122) [Andrew Bardsley]

Verilator 3.890 2016-11-25

Minor:

• Honor --output-split on coverage constructors. (#1098) [Johan Bjork]
• Fix various issues when making outside of the kit.
• Fix flex 2.6.2 bug. (#1103) [Sergey Kvachonok]
• Fix error on bad interface name. (#1097) [Todd Strader]
• Fix error on referencing variable in parent. (#1099) [Ian Thompson]
• Fix type parameters with low optimization. (#1101) [Stefan Wallentowitz]

Verilator 3.888 2016-10-14

Major:

• Support foreach. (#1078) [Xuan Guo]

Minor:

• Add --no-decoration to remove output comments, msg2015. [Frederic Requin]
• If VM_PARALLEL_BUILDS=1, use OPT_FAST and OPT_SLOW. [Frederic Requin] Set VM_DEFAULT_RULES=0 for old behavior.
• Add error on DPI functions > 32 bits. (#1898) [Elliot Mednick]
• Improve Verilation performance on internal strings. (#1896) [Johan Bjork]
• Improve Verilation performance on trace duplicates. (#1090) [Johan Bjork]
• Fix SystemC compiles with VPI. (#1081) [Arthur Kahlich]
• Fix error on wide numbers that represent shifts, msg1991. (#1088) [Mandy Xu]

Verilator 3.886 2016-07-30

Minor:

• Fix enum values of 11-16 bits wide using .next/.prev. (#1062) [Brian Flachs]
• Fix false warnings on non-power-2 enums using .next/.prev.
• Fix comparison of unpacked arrays. (#1071) [Andrew Bardsley]
• Fix compiler warning in GCC 6. [David Horton]

Verilator 3.884 2016-05-18

Major:

• Support parameter type. (#376) [Alan Hunter, et al]
• Support command-line -G/+pvalue param overrides. (#1045) [Stefan Wallentowitz]
• Add --l2-name option for controlling "v" naming.
• The default l2 scope name is now the same as the top-level module. (#1050) Use "--l2-name v" for the historical behavior.

Minor:

• Fix --output-split of constructors. (#1035) [Johan Bjork]
• Fix removal of empty packages, modules and cells. (#1034) [Johan Bjork]
• Fix core dump on Arch Linux/GCC 6.1.1. (#1058) [Jannis Harder]
• Fix $value$plusargs to string. (#1880) [Frederic Requin]

Verilator 3.882 2016-03-01

Minor:

• Internal Verilation-time performance enhancements. (#1021) [Johan Bjork]
• Support inlining interfaces. (#1018) [Johan Bjork]
• Support SV strings to readmemh. (#1040) [Stefan Wallentowitz]
• Fix unrolling complicated for-loop bounds. (#677) [Johan Bjork]
• Fix stats file containing multiple unroll entries. (#1020) [Johan Bjork]
• Fix using short parameter names on negative params. (#1022) [Duraid Madina]
• Fix read-after-free error. (#1031) [Johan Bjork]
• Fix elaboration-time display warnings. (#1032) [Johan Bjork]
• Fix crash on very deep function trees. (#1028) [Jonathan Kimmitt]
• Fix slicing mix of big and little-endian. (#1033) [Geoff Barrett]
• Fix pattern assignment width propagation. (#1037) [Johan Bjork]

Verilator 3.880 2015-12-19

Minor:

• Support display %u, %v, %p, %z. (#989) [Johan Bjork]
• Fix real parameters causing bad module names. (#992) [Johan Bjork]
• Fix size-changing cast on packed struct. (#993) [Johan Bjork]
• Fix function calls on arrayed interface. (#994) [Johan Bjork]
• Fix arrayed interfaces. (#879) (#1001) [Todd Strader]
• Fix constant function assigned to packed structs. (#997) [Johan Bjork]
• Fix interface inside generate. (#998) [Johan Bjork]
• Fix $signed casts under generates. (#999) [Clifford Wolf]
• Fix genvar constant propagation. (#1003) [Johan Bjork]
• Fix parameter constant propagation from package. (#1004) [Johan Bjork]
• Fix array slicing of non-const indexes. (#1006) [Johan Bjork]
• Fix dotted generated array error. (#1005) [Jeff Bush, Johan Bjork]
• Fix error instead of warning on large concat. (#1865) [Paul Rolfe]
• Fix $bitstoreal constant propagation. (#1012) [Jonathan Kimmitt]
• Fix model restore crash. (#1013) [Jason McMullan]
• Fix arrayed instances to unpacked of same size. (#1015) [Varun Koyyalagunta]
• Fix slices of unpacked arrays with non-zero LSBs.
• Fix ternary operation with unpacked array. (#1017) [Varun Koyyalagunta].

Verilator 3.878 2015-11-01

Major:

• Add --vpi flag, and fix VPI linkage. (#969) [Arthur Kahlich]
• Support genvar indexes into arrayed cells. (#517) [Todd Strader]
• Support $sformatf. (#977) [Johan Bjork]
• Support elaboration assertions. (#973) [Johan Bjork]
• Support $display with non-format arguments. (#467) [Jamey Hicks]

Minor:

• Add VerilatedScopeNameMap for introspection. (#966) [Todd Strader]
• Ignore %l in $display. (#983) [Todd Strader]
• Fix very long module names. (#937) [Todd Strader]
• Fix internal error on dotted refs into generates. (#958) [Jie Xu]
• Fix structure parameter constant propagation. (#968) [Todd Strader]
• Fix enum constant propagation. (#970) [Todd Strader]
• Fix mis-optimizing public DPI functions. (#963) [Wei Song]
• Fix package:scope.scope variable references.
• Fix $fwrite to constant stderr/stdout. (#961) [Wei Song]
• Fix struct.enum.name method calls. (#855) [Jonathon Donaldson]
• Fix dot indexing into arrayed inferfaces. (#978) [Johan Bjork]
• Fix crash in commandArgsPlusMatch. (#987) [Jamie Iles]
• Fix error message on missing interface. (#985) [Todd Strader]

Verilator 3.876 2015-08-12

Minor:

• Add tracing_on, etc to vlt files. (#932) [Frederic Requin]
• Support extraction of enum bits. (#951) [Jonathon Donaldson]
• Fix MinGW compiler error. (#927) (#929) [Hans Tichelaar]
• Fix .c files to be treated as .cpp. (#930) [Jonathon Donaldson]
• Fix string-to-int space conversion. (#931) [Fabrizio Ferrandi]
• Fix dpi imports inside generates. [Michael Tresidder]
• Fix rounding in trace $timescale. (#946) [Frederic Requin]
• Fix $fopen with SV string. (#947) [Sven Stucki]
• Fix hashed error with typedef inside block. (#948) [Sven Stucki]
• Fix makefile with --coverage. (#953) [Eivind Liland]
• Fix coverage documentation. (#954) [Thomas J Whatson]
• Fix parameters with function parameter arguments. (#952) [Jie Xu]
• Fix size casts as second argument of cast item. (#950) [Jonathon Donaldson]

Verilator 3.874 2015-06-06

Minor:

• Add pkg-config .pc file. (#919) [Stefan Wallentowitz]
• Fix installing missing manpages. (#908) [Ahmed El-Mahmoudy]
• Fix sign extension in large localparams. (#910) [Mike Thyer]
• Fix core dump in sync-async warnings. (#911) [Sebastian Dressler]
• Fix truncation warning with -pins-bv. (#912) [Alfonso Martinez]
• Fix Cygwin uint32 compile. (#914) [Matthew Barr]
• Fix preprocessing stringified newline escapes. (#915) [Anton Rapp]
• Fix part-select in constant function. (#916) [Andrew Bardsley]
• Fix width extension on mis-width ports. (#918) [Patrick Maupin]
• Fix width propagation on sized casts. (#925) [Jonathon Donaldson]
• Fix MSVC++ compiler error. (#927) [Hans Tichelaar]

Verilator 3.872 2015-04-05

Minor:

• Add VerilatedVcdFile to allow real-time waveforms. (#890) [HyungKi Jeong]
• Add --clk and related optimizations. (#1840) [Jie Xu]
• Fix order of C style arrays. [Duraid Madina]
• Add --dump-treei-<srcfile>. (#894) [Jie Xu]
• Fix comma-instantiations with parameters. (#884) [Franck Jullien]
• Fix SystemC arrayed bit vectors. (#886) [David Poole]
• Fix compile error on MinGW. (#887) [HyungKi Jeong]

Verilator 3.870 2015-02-12

Minor:

• Suppress COMBDLY when inside always_latch. (#864) [Iztok Jeras]
• Support cast operator with expression size. (#865) [Iztok Jeras]
• Add warning on slice selection out of bounds. (#875) [Cong Van Nguyen].
• Fix member select error broke in 3.868. (#867) [Iztok Jeras]
• Fix $sccanf from string. (#866) [David Pierce]
• Fix VM_PARALLEL_BUILDS broke in 3.868. (#870) [Hiroki Honda]
• Fix non-ANSI modport instantiations. (#868) [Kevin Thompson]
• Fix UNOPTFLAT change detect on multidim arrays. (#872) [Andrew Bardsley]
• Fix slice connections of arrays to ports. (#880) [Varun Koyyalagunta]
• Fix mis-optimizing gate assignments in unopt blocks. (#881) [Mike Thyer]
• Fix sign extension of pattern members. (#882) [Iztok Jeras]
• Fix clang compile warnings.

Verilator 3.868 2014-12-20

Major:

• New verilator_coverage program added to replace SystemPerl's vcoverage.
• PSL support was removed, please use System Verilog assertions.
• SystemPerl mode is deprecated and now untested.

Minor:

• Support enum.first/name and similar methods. (#460) (#848)
• Add 'string' printing and comparisons. (#746) (#747) etc.
• Inline C functions that are used only once. (#1838) [Jie Xu]
• Fix tracing SystemC signals with structures. (#858) [Eivind Liland] Note that SystemC traces will no longer show the signals in the wrapper, they can be seen one level further down.
• Add --stats-vars. (#851) [Jeremy Bennett]
• Fix bare generates in interfaces. (#789) [Bob Newgard]
• Fix underscores in real literals. (#863) [Jonathon Donaldson]

Verilator 3.866 2014-11-15

Minor:

• Fix +define+A+B to define A and B to match other simulators. (#847) [Adam Krolnik]
• Add optimization of wires from arrayed cells. (#1831) [Jie Xu]
• Add optimization of operators between concats. (#1831) [Jie Xu]
• Add public enums. (#833) [Jonathon Donaldson]
• Trace_off now operates on cells. (#826) [Lane Brooks]
• Fix public parameters in unused packages. (#804) [Jonathon Donaldson]
• Fix select when partially out-of-bound. (#823) [Clifford Wolf]
• Fix generate unrolling with function call. (#830) [Steven Slatter]
• Fix cast-to-size context-determined sizing. (#828) [Geoff Barrett]
• Fix not tracing modules following primitives. (#837) [Jie Xu]
• Fix trace overflow on huge arrays. (#834) [Geoff Barrett]
• Fix quoted comment slashes in defines. (#845) [Adam Krolnik]

Verilator 3.864 2014-09-21

Minor:

• Support power operator with real. (#809) [Jonathon Donaldson]
• Improve verilator_profcfunc time attributions. [Jonathon Donaldson]
• Fix duplicate anonymous structures in $root. (#788) [Bob Newgard]
• Fix mis-optimization of bit-swap in wide signal. (#800) [Jie Xu]
• Fix error when tracing public parameters. (#722) [Jonathon Donaldson]
• Fix dpiGetContext in dotted scopes. (#740) [Geoff Barrett]
• Fix over-shift structure optimization error. (#803) [Jeff Bush]
• Fix optional parameter keyword in module #(). (#810) [Iztok Jeras]
• Fix $warning/$error multi-argument ordering. (#816) [Jonathon Donaldson]
• Fix clang warnings. (#818) [Iztok Jeras]
• Fix string formats under deep expressions. (#820) [Iztok Jeras]

Verilator 3.862 2014-06-10

Minor:

• Using command line -Wno-{WARNING} now overrides file-local lint_on.
• Add -P to suppress `line and blanks with preprocessing. (#781) [Derek Lockhart]
• Support SV 2012 package import before port list.
• Change SYMRSVDWORD to print as warning rather than error.
• Fix seg-fault with variable of parameterized interface. (#692) [Jie Xu]
• Fix false name conflict on cells in generate blocks. (#749) [Igor Lesik]
• Fix pattern assignment to basic types. (#767) [Jie Xu]
• Fix pattern assignment to conditionals. (#769) [Jie Xu]
• Fix shift corner-cases. (#765) (#766) (#768) (#772) (#774) (#776) [Clifford Wolf]
• Fix C compiler interpreting signing. (#773) [Clifford Wolf]
• Fix late constant division by zero giving X error. (#775) [Clifford Wolf]
• Fix gate primitives with arrays and non-arrayed pins.
• Fix DETECTARRAY error on packed arrays. (#770) [Jie Xu]
• Fix ENDLABEL warnings on escaped identifiers.
• Fix string corruption. (#780) [Derek Lockhart]

Verilator 3.860 2014-05-11

Major:

• PSL is no longer supported, please use System Verilog assertions.
• Support '{} assignment pattern on arrays. (#355)
• Support streaming operators. (#649) [Glen Gibb]
• Fix expression problems with -Wno-WIDTH. (#729) (#736) (#737) (#759) Where WIDTH warnings were ignored this might result in different warning messages and results, though it should better match the spec. [Clifford Wolf]

Minor:

• Add --no-trace-params.
• Add assertions on 'unique if'. (#725) [Jeff Bush]
• Add PINCONNECTEMPTY warning. [Holger Waechtler]
• Support parameter arrays. (#683) [Jeremy Bennett]
• Documentation fixes. (#723) [Glen Gibb]
• Support {} in always sensitivity lists. (#745) [Igor Lesik]
• Fix begin_keywords "1800+VAMS". (#1806)
• Fix tracing of package variables and real arrays.
• Fix tracing of packed arrays without --trace-structs. (#742) [Jie Xu]
• Fix missing coverage line on else-if. (#727) [Sharad Bagri]
• Fix modport function import not-found error.
• Fix power operator calculation. (#730) (#735) [Clifford Wolf]
• Fix reporting struct members as reserved words. (#741) [Chris Randall]
• Fix change detection error on unions. (#758) [Jie Xu]
• Fix -Wno-UNOPTFLAT change detection with 64-bits. (#762) [Clifford Wolf]
• Fix shift-right optimization. (#763) [Clifford Wolf]
• Fix Mac OS-X test issues. [Holger Waechtler]
• Fix C++-2011 warnings.

Verilator 3.856 2014-03-11

Minor:

• Support case inside. (#708) [Jan Egil Ruud]
• Add parameters into trace files. (#706) [Alex Solomatnikov]
• Fix parsing "#0 'b0". (#256)
• Fix array bound checks on real variables.
• Fix --skip-identical mis-detecting on OS-X. (#707)
• Fix missing VL_SHIFTRS_IQI with WIDTH warning. (#714) [Fabrizio Ferrandi]
• Fix signed shift right optimization. (#715) [Fabrizio Ferrandi]
• Fix internal error on "input x =" syntax error. (#716) [Lane Brooks]
• Fix slice extraction from packed array. (#717) [Jan Egil Ruud]
• Fix inside statement EQWILD error. (#718) [Jan Egil Ruud]

Verilator 3.855 2014-01-18

Minor:

• Support modport import. (#696) [Jeremy Bennett]
• Add --trace-structs to show struct names. (#673) [Chris Randall]
• Fix tracing of packed structs. (#705) [Jie Xu]
• Fix --lint-only with MinGW. (#1813) [HyungKi Jeong]
• Fix some delayed assignments of typedefed unpacked arrays.
• Fix wire declarations with size and not range. (#466) [Alex Solomatnikov]
• Fix parameter pin vs. normal pin error. (#704) [Alex Solomatnikov]

Verilator 3.854 2013-11-26

Minor:

• Add UNPACKED warning to convert unpacked structs. [Jeremy Bennett]
• Add --compiler clang to work around compiler bug. (#694) [Stefan Ludwig]
• Support vpi_get of vpiSuppressVal. (#687) [Varun Koyyalagunta]
• Support vpi_get_time. (#688) [Varun Koyyalagunta]
• Fix evaluation of chained parameter functions. (#684) [Ted Campbell]
• Fix enum value extension of '1.
• Fix multiple VPI variable callbacks. (#679) [Rich Porter]
• Fix vpi_get of vpiSize. (#680) [Rich Porter]
• Fix vpi_remove_cb inside callback. (#689) [Varun Koyyalagunta]
• Fix crash with coverage of structures. (#691) [Eivind Liland]
• Fix array assignment from const var. (#693) [Jie Xu]

Verilator 3.853 2013-09-30

Minor:

• Add --no-order-clock-delay to work around #613. [Charlie Brej]

Verilator 3.852 2013-09-29

Minor:

• Support named function and task arguments. [Chris Randall]
• Report SELRANGE warning for non-generate if. (#675) [Roland Kruse]
• Fix ordering of $fgetc. (#1808) [Frederic Requin]
• Fix --output-split-cfunc to count internal functions. [Chris Randall]
• Fix crash on 32-bit Ubuntu. (#670) [Mark Jackson Pulver]

Verilator 3.851 2013-08-15

Minor:

• Fix ordering of clock enables with delayed assigns. (#613) [Jeremy Bennett]
• Fix vpi_iterate on memory words. (#655) [Rich Porter]
• Fix final duplicate declarations when non-inlined. (#661) [Charlie Brej]
• Fix interface ports with comma lists. (#1779) [Ed Lander]
• Fix parameter real conversion from integer.
• Fix clang warnings. (#668) [Yutetsu Takatsukasa]

Verilator 3.850 2013-06-02

Major:

• Support interfaces and modports. (#102) [Byron Bradley, Jeremy Bennett]

Minor:

• Duplicate clock gate optimization on by default. (#621)
• Fix arrayed input compile error. (#645) [Krzysztof Jankowski]
• Fix GCC version runtime changes. (#651) [Jeremy Bennett]
• Fix packed array select internal error. (#652) [Krzysztof Jankowski]

Verilator 3.847 2013-05-11

Minor:

• Add ALWCOMBORDER warning. [KC Buckenmaier]
• Add --pins-sc-uint and --pins-sc-biguint. (#638) [Alex Hornung]
• Support "signal[vec]++".
• Fix simulation error when inputs and MULTIDRIVEN. (#634) [Ted Campbell]
• Fix module resolution with __. (#631) [Jason McMullan]
• Fix packed array non-zero right index select crash. (#642) [Krzysztof Jankowski]
• Fix nested union crash. (#643) [Krzysztof Jankowski]

Verilator 3.846 2013-03-09

Major:

• IEEE 1800-2012 is now the default language. This adds 4 new keywords and updates the svdpi.h and vpi_user.h header files.
• Add --report-unoptflat. (#611) [Jeremy Bennett]

Minor:

• Add duplicate clock gate optimization. (#1772) [Varun Koyyalagunta] Disabled unless -OD or -O3 used, please try it as may get some significant speedups.
• Support pattern assignment features. (#616) (#617) (#618) [Ed Lander]
• Support bind in $unit. (#602) [Ed Lander]
• Support <number>'() sized casts. (#628) [Ed Lander]
• Fix wrong dot resolution under inlining. [Art Stamness]
• Fix DETECTARRAY on packed structures. (#610) [Jeremy Bennett]
• Fix LITENDIAN on unpacked structures. (#614) [Wai Sum Mong]
• Fix 32-bit OS VPI scan issue. (#615) [Jeremy Bennett, Rich Porter]
• Fix opening a VerilatedVcdC file multiple times. (#1774) [Frederic Requin]
• Fix UNOPTFLAT circular array bounds crossing. (#630) [Jie Xu]

Verilator 3.845 2013-02-04

Minor:

• Fix nested packed arrays and struct. (#600) [Jeremy Bennett] Packed arrays are now represented as a single linear vector in Verilated models. This may affect packed arrays that are public or accessed via the VPI.
• Support wires with data types. (#608) [Ed Lander]
• Support bind, to module names only. (#602) [Ed Lander]
• Support VPI product info, warning calls, etc. (#588) [Rick Porter]
• Support $left, $right and related functions. (#448) [Iztok Jeras]
• Support inside expressions.
• Define SYSTEMVERILOG, SV_COV_START and other IEEE mandated predefines.
• Fix pin width mismatch error. (#595) [Alex Solomatnikov]
• Fix implicit one bit parameter selection. (#603) [Jeremy Bennett]
• Fix signed/unsigned parameter misconversion. (#606) [Jeremy Bennett]
• Fix segfault on multidimensional dotted arrays. (#607) [Jie Xu]
• Fix per-bit array output connection error. (#414) [Jan Egil Ruud]
• Fix package logic var compile error.
• Fix enums with X values.

Verilator 3.844 2013-01-09

Minor:

• Support "unsigned int" DPI import functions. (#1770) [Alex Lee]
• Fix package resolution of parameters. (#586) [Jeremy Bennett]
• Fix non-integer vpi_get_value. (#587) [Rich Porter]
• Fix task inlining under $display and case. (#589) (#598) [Holger Waechtler]
• Fix package import of non-localparam parameter. (#474) (#591) [Jeremy Bennett]
• Fix package import of package imports, partial #592. [Jeremy Bennett]
• Fix package import preventing local var. (#599) [Jeremy Bennett]
• Fix array extraction of implicit vars. (#601) [Joe Eiler]

Verilator 3.843 2012-12-01

Minor:

• Add +1364-1995ext and similar language options. (#532) [Jeremy Bennett]
• Fix mis-optimized identical submodule subtract. (#581) [Charlie Brej]
• Fix crash on dotted references into dead modules. (#583) [Jeremy Bennett]
• Fix compile issues on MSVCC. (#571) (#577) [Amir Gonnen]
• Fix --debug overriding preceding --dump-treei. (#580) [Jeremy Bennett]

Verilator 3.842 2012-11-03

Minor:

• Add -x-initial-edge. (#570) [Jeremy Bennett]
• Fix parameter pins interspersed with cells broke in 3.840. [Bernard Deadman]
• Fix large shift error on large shift constants. [David Welch]
• Fix $display mangling on GCC 4.7 and speed up. (#1765) (#373) (#574) [R Diez]
• Fix array of struct references giving false error. (#566) [Julius Baxter]
• Fix missing var access functions when no DPI. (#572) [Amir Gonnen]
• Fix name collision on unnamed blocks. (#567) [Chandan Egbert]
• Fix name collision on task inputs. (#569) [Chandan Egbert]

Verilator 3.841 2012-09-03

Major:

• Add --savable to support model save/restore. [Jeremy Bennett]

Minor:

• Support '{} assignment pattern on structures, part of #355.
• Fix double-deep parameter cell WIDTHs. (#541) [Hiroki Honda]
• Fix imports under multiple instantiated cells. (#542) [Alex Solomatnikov]
• Fix defparam in generate broke in 3.840. (#543) [Alex Solomatnikov]
• Fix duplicate begin error broke in 3.840. (#548) [Alex Solomatnikov]
• Fix triangle symbol resolution error broke in 3.840. (#550) [Ted Campbell]

Verilator 3.840 2012-07-31 Beta

Major:

• Rewrote tristate handling; supports tri0, tri1, tristate bit selects, concatenates and pullup/pulldowns. (#395) (#56) (#54) (#51) [Alex Solomatnikov, Lane Brooks, et al]
• Support packed structures and unions. (#181) Note this was a major internal change that may lead to some instability.

Minor:

• Support tri0 and tri1. (#462) [Alex Solomatnikov]
• Support nmos and pmos. (#488) [Alex Solomatnikov]
• Add INITIALDLY warning on initial assignments. (#478) [Alex Solomatnikov]
• Add PINMISSING and PINNOCONNECT lint checks.
• Add --converge-limit option.
• Fix generate operators not short circuiting. (#413) [by Jeremy Bennett]
• Fix parameters not supported in constant functions. (#474) [Alex Solomatnikov]
• Fix duplicate warnings/errors. (#516) [Alex Solomatnikov]
• Fix signed extending biops with WIDTH warning off. (#511) [Junji Hashimoto]
• Fix ITOD internal error on real conversions. (#491) [Alex Solomatnikov]
• Fix input and real loosing real data type. (#501) [Alex Solomatnikov]
• Fix imports causing symbol table error. (#490) [Alex Solomatnikov]
• Fix newlines in radix values. (#507) [Walter Lavino]
• Fix loop error message to report line. (#513) [Jeremy Bennett]
• Fix false UNUSED warning on file system calls.
• Fix GCC 4.7.0 compile warnings. (#530) [Jeremy Bennett]
• Fix svdpi.h compile error on Apple OS.
• Fix compile error under git submodules. (#534) [Aurelien Francillon]

Verilator 3.833 2012-04-15

Minor:

• Support += and -= in standard for loops. (#463) [Alex Solomatnikov]
• Fix processing unused parameterized modules. (#469) (#470) [Alex Solomatnikov]
• Add SELRANGE as warning instead of error. (#477) [Alex Solomatnikov]
• Add readme.pdf and internal.pdf and doxygen. (#483) [by Jeremy Bennett]
• Fix change detections on arrays. (#364) [John Stevenson, Alex Solomatnikov]
• Fix signed array warning. (#456) [Alex Solomatnikov]
• Fix genvar and begin under generate. (#461) [Alex Solomatnikov]
• Fix real constant parameter functions. (#475) [Alex Solomatnikov]
• Fix and document --gdb option. (#454) [Jeremy Bennett]
• Fix OpenSolaris compile error. [Sanjay Singh]

Verilator 3.832 2012-03-07

Minor:

• Fix memory delayed assignments from multiple clock domains. [Andrew Ling]
• Support arrayed SystemC I/O pins. [Christophe Joly]
• Report MULTIDRIVEN on memories set in multiple clock domains.
• Report ENDLABEL on mismatching end labels. (#450) [Iztok Jeras]
• Fix expansion of back-slashed escaped macros. (#441) [Alberto Del Rio]
• Fix inheriting real and signed type across untyped parameters.
• Fix core dump with over 100 deep UNOPTFLAT. (#432) [Joe Eiler]
• Fix false command not found warning in makefiles. [Ruben Diez]
• Fix hang when functions inside begin block. [David Welch]
• Fix hang on recursive substitution `defines. (#443) [Alex Solomatnikov]

Verilator 3.831 2012-01-20

Major:

• Support SystemC 2.3.0 prerelease. This requires setting the new SYSTEMC_INCLUDE and SYSTEMC_LIBDIR variables in place of now deprecated SYSTEMC and SYSTEMC_ARCH. [Iztok Jeras]

Minor:

• Suppress VARHIDDEN on dpi import arguments. [Ruben Diez]
• Support "generate for (genvar i=0; ...". [David Kravitz]
• Fix dpi exports with > 32 bit but < 64 bit args. (#423) [Chandan Egbert]
• Fix array of instantiations with sub-range output. (#414) [Jeremy Bennett]
• Fix BLKSEQ warnings on variables declared inside always. [Ruben Diez]

Verilator 3.830 2011-11-27

Major:

• With "--language VAMS" support a touch of Verilog AMS. [Holger Waechtler]

Minor:

• Add sc_bv attribute to force bit vectors. (#402) [by Stefan Wallentowitz]
• Search for user -y paths before default current directory. [Ruben Diez]
• Support constants in sensitivity lists. (#412) [Jeremy Bennett]
• Support $system. [Ruben Diez]
• Support $sscanf with %g. [Holger Waechtler]
• Indicate 'exiting due to errors' if errors, not warnings. [Ruben Diez]
• Fix bad result with if-else-return optimization. (#420) [Alex Solomatnikov]
• Fix reporting not found modules if generate-off. (#403) [Jeremy Bennett]
• Fix $display with %d following %g. [Holger Waechtler]

Verilator 3.824 2011-10-25

Minor:

• Fix "always @ (* )". (#403) (#404) [Walter Lavino]
• Add ASSIGNIN as suppressible error. [Jeremy Bennett]
• Fix 3.823 constructor core dump on Debian. (#401) [Ahmed El-Mahmoudy]

Verilator 3.823 2011-10-20

Minor:

• Support $ceil, $floor, etc. [Alex Solomatnikov]
• Add configure options for cc warnings and extended tests. [Ruben Diez]
• Add -Wall reporting ASSIGNDLY on assignment delays. [Ruben Diez]
• Fix UNDRIVEN warnings inside DPI import functions. [Ruben Diez]
• Fix --help output to go to stderr, not stdout. (#397) [Ruben Diez]
• Fix DPI import output of 64 bits. (#398) [Mike Denio]
• Fix DPI import false BLKSEQ warnings. [Alex Solomatnikov]
• Fix MSVC compile warning with trunc/round. (#394) [Amir Gonnen]
• Fix autoconf and Makefile warnings. (#396) [Ruben Diez]

Verilator 3.821 2011-09-14

Minor:

• Fix PowerPC runtime error. (#288) [Ahmed El-Mahmoudy]
• Fix internal error on integer casts. (#374) [Chandan Egbert]

Verilator 3.820 2011-07-28

Minor:

• Support 'real' numbers and related functions.
• Support 'const' variables in limited cases; similar to enums. [Alex Solomatnikov]
• Support disable for loop escapes.
• Support $fopen and I/O with integer instead of `verilator_file_descriptor.
• Support coverage in -cc and -sc output modes. [John Li] Note this requires SystemPerl 1.338 or newer.
• Use 'vluint64_t' for SystemC instead of (same sized) 'uint64' for MSVC++.
• Fix vpi_register_cb using bad s_cb_data. (#370) [by Thomas Watts]
• Fix $display missing leading zeros in %0d. (#367) [Alex Solomatnikov]

Verilator 3.813 2011-06-28

Minor:

• Support bit vectors > 64 bits wide in DPI import and exports.
• Fix out of memory on slice syntax error. (#354) [Alex Solomatnikov]
• Fix error on enum references to other packages. (#339) [Alex Solomatnikov]
• Fix DPI undeclared svBitVecVal compile error. (#346) [Chandan Egbert]
• Fix DPI bit vector compile errors. (#347) (#359) [Chandan Egbert]
• Fix CDCRSTLOGIC report showing endpoint flops without resets.
• Fix compiler warnings on SPARC. (#288) [Ahmed El-Mahmoudy]

Verilator 3.812 2011-04-06

Minor:

• Add --trace-max-width and --trace-max-array. (#319) [Alex Solomatnikov]
• Add --Wno-fatal to turn off abort on warnings. [by Stefan Wallentowitz]
• Support ${...} and $(...) env vars in .vc files. [by Stefan Wallentowitz]
• Support $bits(data_type). (#327) [Alex Solomatnikov]
• Support loop unrolling on width mismatches. (#333) [Joe Eiler]
• Support simple cast operators. (#335) [Alex Solomatnikov]
• Accelerate bit-selected inversions.
• Add error on circular parameter definitions. (#329) [Alex Solomatnikov]
• Fix concatenates and vectored bufif1. (#326) [Iztok Jeras]

Verilator 3.811 2011-02-14

Minor:

• Report error on duplicated or empty pins. (#321) [Christian Leber]
• Report error on function call output tied to constant. [Bernard Deadman]
• Throw UNUSED/UNDRIVEN only once per net in a parameterized module.
• Fix internal error on functions called as SV tasks. [Bernard Deadman]
• Fix internal error on non-inlined inout pins. [Jeff Winston]
• Fix false BLKSEQ on non-unrolled for loop indexes. [Jeff Winston]
• Fix block comment not separating identifiers. (#311) [Gene Sullivan]
• Fix warnings to point to lowest net usage, not upper level ports.
• Fix error on constants connected to outputs. (#323) [Christian Leber]

Verilator 3.810 2011-01-03

Major:

• Add limited support for VPI access to public signals, see docs.
• Add -F option to read relative option files. (#297) [Neil Hamilton]
• Support ++,--,+= etc as standalone statements. [Alex Solomatnikov]
• Add -Wall, -Wwarn-style, -Wno-style to enable code style warnings that have been added to this release, and disabled by default:
• With --Wall, add BLKSEQ warning on blocking assignments in seq blocks.
• With --Wall, add DECLFILENAME warning on modules not matching filename.
• With --Wall, add DEFPARAM warning on deprecated defparam statements.
• With --Wall, add IFDEPTH warning on deep if statements.
• With --Wall, add INCABSPATH warning on `include with absolute paths.
• With --Wall, add SYNCASYNCNET warning on mixed sync/async reset nets.
• With --Wall, add UNDRIVEN warning on undriven nets.
• With --Wall, add UNUSED warning on unused nets.

Minor:

• When running with VERILATOR_ROOT, optionally find binaries under bin.
• Suppress WIDTH warnings when adding/subtracting 1'b1.
• The VARHIDDEN warning is now disabled by default, use -Wall to enable.

Verilator 3.805 2010-11-02

Minor:

• Add warning when directory contains spaces. (#1705) [Salman Sheikh]
• Fix wrong filename on include file errors. (#289) [Brad Parker]
• Fix segfault on SystemVerilog "output wire foo=0". (#291) [Joshua Wise]
• Fix DPI export name not found. (#1703) [Terry Chen]

Verilator 3.804 2010-09-20

Minor:

• Support tracing/coverage of underscore signals. (#280) [by Jason McMullan]
• Increase define recursions before error. [Paul Liu]
• On core dump, print debug suggestions.
• Fix preprocessor `` of existing base define. (#283) [Usha Priyadharshini]

Verilator 3.803 2010-07-10

Minor:

• Fix preprocessor preservation of newlines across macro substitutions.
• Fix preprocessor stringification of nested macros.
• Fix some constant parameter functions causing crash. (#253) [Nick Bowler]
• Fix do {...} while() not requiring final semicolon.

Verilator 3.802 2010-05-01

Minor:

• Support runtime access to public signal names.
• Add /verilator public_flat_rw/ for timing-specific public access.
• Fix word size to match uint64_t on -m64 systems. (#238) [Joe Eiler]
• Improve error handling on slices of arrays. (#226) [by Byron Bradley]
• Report errors when extra underscores used in meta-comments.
• Fix bit reductions on multi-packed dimensions. (#227) [by Byron Bradley]
• Fix removing $fscanf if assigned to unused var. (#248) [Ashutosh Das]
• Fix "make install" with configure outside srcdir. [Stefan Wallentowitz]
• Fix loop unroller out of memory; change --unroll-stmts. [Ashutosh Das]
• Fix trace files with empty modules crashing some viewers.
• Fix parsing single files > 2GB. [Jeffrey Short]
• Fix installing data files as non-executable. (#168) [by Ahmed El-Mahmoudy]

Verilator 3.801 2010-03-17

Minor:

• Support "break", "continue", "return".
• Support "`default_nettype none|wire". [Dominic Plunkett]
• Skip SystemC tests if not installed. [Iztok Jeras]
• Fix clock-gates with non-AND complex logic. (#220) [Ashutosh Das]
• Fix flushing VCD buffers on $stop. [Ashutosh Das]
• Fix Mac OS-X compile issues. (#217) [Joshua Wise, Trevor Williams]
• Fix make uninstall. (#216) [Iztok Jeras]
• Fix parameterized defines with empty arguments.

Verilator 3.800 2010-02-07

Major application visible changes:

• SystemPerl is no longer required for tracing. Applications must use VerilatedVcdC class in place of SpTraceVcdC.
• SystemVerilog 1800-2009 is now the default language. Thus "global" etc are now keywords. See the --language option.

Major new features:

• Support SystemVerilog types "byte", "chandle", "int", "longint", "shortint", "time", "var" and "void" in variables and functions.
• Support "program", "package", "import" and $unit.
• Support typedef and enum. [by Donal Casey]
• Support direct programming interface (DPI) "import" and "export". Includes an extension to map user $system PLI calls to the DPI.
• Support assignments of multidimensional slices. (#170) [by Byron Bradley]
• Support multidimensional inputs/outputs. (#171) [by Byron Bradley]
• Support "reg [1:0][1:0][1:0]" and "reg x [3][2]". (#176) [Byron Bradley]
• Support declarations in loop initializers. (#172) [by Byron Bradley]
• Support $test$plusargs and $value$plusargs, but see the docs!
• Support $sformat and $swrite.
• Support 1800-2009 define defaults and `undefineall.
• Add -CFLAGS, -LDFLAGS, <file>.a, <file>.o, and <file>.so options.
• Speed compiles by avoiding including the STL iostream header. Application programs may need to include it themselves to avoid errors.
• Add experimental clock domain crossing checks.
• Add experimental --pipe-filter to filter all Verilog input.
• Add experimental config files to filter warnings outside of the source.
• Add VARHIDDEN warning when signal name hides module name.
• Support optional cell parenthesis. (#179) [by Byron Bradley]
• Support for-loop i++, ++i, i--, --i. (#175) [by Byron Bradley]
• Support 1800-2009 /comments/ in define values.
• Add Makefile VM_GLOBAL_FAST, listing objects needed to link executables.
• Add --bbox-unsup option to black-box unsupported UDP tables.
• Add -Wno-MODDUP option to allow duplicate modules.

Bug fixes:

• Fix implicit variable issues. (#196) (#201) [Byron Bradley]
• Fix 'for' variable typing. (#205) [by Byron Bradley]
• Fix tracing with --pins-bv 1. (#195) [Michael S]
• Fix MSVC++ 2008 compile issues. (#209) [Amir Gonnen]
• Fix MinGW compilation. (#184) (#214) [by Shankar Giri, Amir Gonnen]
• Fix Cygwin 1.7.x compiler error with uint32_t. (#204) [Ivan Djordjevic]
• Fix `define argument mis-replacing system task of same name. (#191)
• Fix Verilator core dump on wide integer divides. (#178) [Byron Bradley]
• Fix lint_off/lint_on meta comments on same line as warning.

Verilator 3.720 2009-10-26

Major:

• Support little endian bit vectors ("reg [0:2] x;").
• Support division and modulus of > 64 bit vectors. [Gary Thomas]

Minor:

• Fix writing to out-of-bounds arrays writing element 0.
• Fix core dump with SystemVerilog var declarations under unnamed begins.
• Fix VCD files showing internal flattened hierarchy, broke in 3.714.
• Fix cell port connection to unsized integer causing false width warning.
• Fix erroring on strings with backslashed newlines. (#168) [Pete Nixon]

Verilator 3.714 2009-09-18

Major:

• Add --bbox-sys option to blackbox $system calls.

Minor:

• Support generate for var++, var--, ++var, --var.
• Improved warning when "do" used as identifier.
• Don't require SYSTEMPERL_INCLUDE if SYSTEMPERL/src exists. [Gary Thomas]
• Fix deep defines causing flex scanner overflows. [Brad Dobbie]
• Fix preprocessing commas in deep parameterized macros. [Brad Dobbie]
• Fix tracing escaped dotted identifiers. (#107)
• Fix $display with uppercase %M.
• Fix --error-limit option being ignored.

Verilator 3.713 2009-08-04

Minor:

• Support constant function calls for parameters. [many!]
• Support SystemVerilog "logic". (#101) [by Alex Duller]
• Name SYMRSVDWORD error, and allow disabling it. (#103) [Gary Thomas]
• Fix escaped preprocessor identifiers. (#106) [Nimrod Gileadi]

Verilator 3.712 2009-07-14

Major:

• Patching SystemC is no longer required to trace sc_bvs.

Minor:

• Add verilator --pins-uint8 option to use sc_in<uint8_t/uint16_t>.
• Add verilator -V option, to show verbose version.
• Add BLKLOOPINIT error code, and describe --unroll-count. [Jeff Winston]
• Support zero-width constants in concatenations. [Jeff Winston]
• On WIDTH warnings, show variable name causing error. [Jeff Winston]

Verilator 3.711 2009-06-23

Minor:

• Support decimal constants of arbitrary widths. [Mark Marshall]
• Fix error on case statement with all duplicate items. (#99) [Gary Thomas]
• Fix segfault on unrolling for's with bad inits. (#90) [Andreas Olofsson]
• Fix tristates causing "Assigned pin is neither...". [by Lane Brooks]
• Fix compiler errors under Fedora release candidate 11. [Chitlesh Goorah]

Verilator 3.710 2009-05-19

Major:

• Verilator is now licensed under LGPL v3 and/or Artistic v2.0.

Minor:

• `__FILE__ now expands to a string, per draft SystemVerilog 2010(ish).
• The front end parser has been re-factored to enable more SV parsing. Code should parse the same, but minor parsing bugs may pop up.
• Verilator_includer is no longer installed twice. (#48) [Lane Brooks]
• Fix escaped identifiers with '.' causing conflicts. (#83) [J Baxter]
• Fix define formal arguments that contain newlines. (#84) [David A]

Verilator 3.703 2009-05-02

Minor:

• Fix $clog2 calculation error with powers-of-2. (#81) [Patricio Kaplan]
• Fix error with tasks that have output first. (#78) [Andrea Foletto]
• Fix "cloning" error with -y/--top-module. (#76) [Dimitris Nalbantis]
• Fix segfault with error on bad --top-module. (#79) [Dimitris Nalbantis]
• Fix "redefining I" error with complex includes. [Duraid Madina]
• Fix GCC 4.3.2 compile warnings.

Verilator 3.702 2009-03-28

Minor:

• Add --pins-bv option to use sc_bv for all ports. [Brian Small]
• Add SYSTEMPERL_INCLUDE envvar to assist RPM builds. [Chitlesh Goorah]
• Report errors when duplicate labels are used. (#72) [Vasu Kandadi]
• Fix the SC_MODULE name() to not include __PVT__. [Bob Fredieu]

Verilator 3.701 2009-02-26

Minor:

• Support repeat and forever statements. [Jeremy Bennett]
• Add --debugi-<srcfile> option, for internal debugging. [Dennis Muhlestein]
• Fix compile issues with GCC 4.3. (#47) [Lane Brooks]
• Fix VL_RANDom to better randomize bits. [Art Stamness]
• Fix error messages to consistently go to stderr. [Jeremy Bennett]
• Fix left associativity for ?: operators.

Verilator 3.700 2009-01-08

Major:

• Support limited tristate inouts. Written by Lane Brooks, under support by Ubixum Inc. This allows common pad ring and tristate-mux structures to be Verilated. See the documentation for more information on supported constructs.
• Add --coverage_toggle for toggle coverage analysis. Running coverage now requires SystemPerl 1.301 or newer.
• Add coverage_on/_off metacomments to bracket coverage regions.

Minor:

• Support posedge of bit-selected signals. (#45) [Rodney Sinclair]
• Optimize two-level shift and and/or trees, +23% on one test.
• Line coverage now aggregates by hierarchy automatically. Previously this would be done inside SystemPerl, which was slower.
• Minor performance improvements of Verilator compiler runtime.
• Coverage of each parameterized module is counted separately. [Bob Fredieu]
• Fix creating parameterized modules when no parameter values are changed.
• Fix certain generate-if cells causing "clone" error. [Stephane Laurent]
• Fix line coverage of public functions. [Soon Koh]
• Fix SystemC 2.2 deprecated warnings about sensitive() and sc_start().
• Fix arrayed variables under function not compiling. (#44) [Ralf Karge]
• Fix --output-split-cfuncs to also split trace code. [Niranjan Prabhu]
• Fix 'bad select range' warning missing some cases. (#43) [Lane Brooks]
• Fix internal signal names containing control characters (broke in 3.680).
• Fix compile error on Ubuntu 8.10. [Christopher Boumenot]
• Fix internal error on "output x; reg x = y;".
• Fix wrong result for read of delayed FSM signal. (#46) [Rodney Sinclair]

Verilator 3.681 2008-11-12

Minor:

• Support SystemVerilog unique and priority case.
• Include Verilog file's directory name in coverage reports.
• Fix 'for' under 'generate-for' causing error. (#38) [Rafael Shirakawa]
• Fix coverage hierarchy being backwards with inlining. [Vasu Arasanipalai]
• Fix GCC 4.3 compile error. (#35) [Lane Brooks]
• Fix MSVC compile error. (#42) [John Stroebel]

Verilator 3.680 2008-10-08

Major:

• Support negative bit indexes. [Stephane Laurent] Tracing negative indexes requires latest Verilog-Perl and SystemPerl.

Minor:

• Suppress width warnings between constant strings and wider vectors. [Rodney Sinclair]
• Ignore SystemVerilog timeunit and timeprecision.
• Expand environment variables in -f input files. [Lawrence Butcher]
• Report error if port declaration is missing. (#32) [Guy-Armand Kamendje]
• Fix genvars causing link error when using --public. [Chris Candler]

Verilator 3.671 2008-09-19

Major:

• SystemC uint64_t pins are now the default instead of sc_bv<64>. Use --no-pins64 for backward compatibility.
• Support SystemVerilog "cover property" statements.

Minor:

• When warnings are disabled on signals that are flattened out, disable the warnings on the signal(s) that replace it.
• Add by-design and by-module subtotals to verilator_profcfunc.
• Add IMPERFECTSCH warning, disabled by default.
• Support coverage under SystemPerl 1.285 and newer.
• Support arbitrary characters in identifiers. [Stephane Laurent]
• Fix extra evaluation of pure combo blocks in SystemC output.
• Fix stack overflow on large ? : trees. [John Sanguinetti]

Verilator 3.670 2008-07-23

Major:

• Add --x-assign=fast option, and make it the default. This chooses performance over reset debugging. See the manual.
• Add --autoflush, for flushing streams after $display. [Steve Tong]
• Add CASEWITHX lint warning and if disabled fix handling of casez with Xs.

Minor:

• Add $feof, $fgetc, $fgets, $fflush, $fscanf, $sscanf. [Holger Waechtler]
• Add $stime. [Holger Waechtler]
• Add $random.
• Add --Wfuture-, for improving forward compatibility.
• Add WIDTH warning to $fopen etc file descriptors.
• Fix verilator_includer not being installed properly. [Holger Waechtler]
• Fix IMPURE errors due to X-assignment temporary variables. [Steve Tong]
• Fix "lvalue" errors with public functions. (#25) [CY Wang]

Verilator 3.665 2008-06-25

Minor:

• Ignore "// verilator" comments alone on endif lines. [Rodney Sinclair]
• "Make install" now installs verilator_includer and verilator_profcfunc.
• Fix tracing missing changes on undriven public wires. [Rodney Sinclair]
• Fix syntax error when "`include `defname" is ifdefed. [John Dickol]
• Fix error when macro call has commas in concatenate. [John Dickol]
• Fix compile errors under Fedora 9, GCC 4.3.0. [by Jeremy Bennett]
• Fix Makefile to find headers/libraries under prefix. [by Holger Waechtler]

Verilator 3.664 2008-05-08

Minor:

• Fix missing file in kit.

Verilator 3.663 2008-05-07

Minor:

• Add DESTDIR to Makefiles to assist RPM construction. [Gunter Dannoritzer]
• Fix compiler warnings under GCC 4.2.1.
• Fix preprocessor `else after series of `elsif. [Mark Nodine]
• Fix parameterized defines calling define with comma. [Joshua Wise]
• Fix comma separated list of primitives. [by Bryan Brady]

Verilator 3.662 2008-04-25

Minor:

• Add Verilog 2005 $clog2() function. This is useful in calculating bus-widths from parameters.
• Support C-style comments in -f option files. [Stefan Thiede]
• Add error message when modules have duplicate names. [Stefan Thiede]
• Support defines terminated in EOF, though against spec. [Stefan Thiede]
• Support optional argument to $finish and $stop. [by Stefan Thiede]
• Support ranges on gate primitive instantiations. [Stefan Thiede]
• Ignore old standard(ish) Verilog-XL defines. [by Stefan Thiede]
• Fix "always @ ((a) or (b))" syntax error. [by Niranjan Prabhu]
• Fix "output reg name=expr;" syntax error. [Martin Scharrer]
• Fix multiple .v files being read in random order. [Stefan Thiede]
• Fix internal error when params get non-constants. [Johan Wouters]
• Fix bug introduced in 3.661 with parameterized defines.

Verilator 3.661 2008-04-04

Major:

• The --enable-defenv configure option added in 3.660 is now the default. This hard-codes a default for VERILATOR_ROOT etc in the executables.
• Add --language option for supporting older code. [Stefan Thiede]
• Add --top-module option to select between multiple tops. [Stefan Thiede]

Minor:

• Unsized concatenates now give WIDTHCONCAT warnings. [Jonathan Kimmitt] Previously they threw fatal errors, which in most cases is correct according to spec, but can be incorrect in presence of parameter values.
• Support functions with "input integer". [Johan Wouters]
• Ignore delays attached to gate UDPs. [Stefan Thiede]
• Fix SystemVerilog parameterized defines with `` expansion, and fix extra whitespace inserted on substitution. [Vladimir Matveyenko]
• Fix no-module include files on command line. [Stefan Thiede]
• Fix dropping of backslash quoted-quote at end of $display.
• Fix task output pin connected to non-variables. [Jonathan Kimmitt]
• Fix missing test_v in install datadir. [Holger Waechtler]
• Fix internal error after MSB < LSB error reported to user. [Stefan Thiede]

Verilator 3.660 2008-03-23

Minor:

• Support hard-coding VERILATOR_ROOT etc in the executables, to enable easier use of Verilator RPMs. [Gunter Dannoritzer]
• Allow multiple .v files on command line. [Stefan Thiede]
• Convert re-defining macro error to warning. [Stefan Thiede]
• Add --error-limit option. [Stefan Thiede]
• Allow __ in cell names by quoting them in C. [Stefan Thiede]
• Fix genvar to be signed, so "< 0" works properly. [Niranjan Prabhu]
• Fix assignments to inputs inside functions/tasks. [Patricio Kaplan]
• Fix definitions in main file.v, referenced in library. [Stefan Thiede]
• Fix undefined assigns to be implicit warnings. [Stefan Thiede]

Verilator 3.658 2008-02-25

Minor:

• Fix unistd compile error in 3.657. [Patricio Kaplan, Jonathan Kimmitt]

Verilator 3.657 2008-02-20

Minor:

• Fix assignments of {a,b,c} = {c,b,a}. [Jonathan Kimmitt]
• Fix Perl warning with --lint-only. [by Ding Xiaoliang]
• Fix to avoid creating obj_dir with --lint-only. [Ding Xiaoliang]
• Fix parsing of always @(*). [Patricio Kaplan]

Verilator 3.656 2008-01-18

Minor:

• Wide VL_CONST_W_#X functions are now made automatically. [Bernard Deadman] In such cases, a new {prefix}__Inlines.h file will be built and included.
• Fix sign error when extracting from signed memory. [Peter Debacker]
• Fix tracing of SystemC w/o SystemPerl. [Bernard Deadman, Johan Wouters]

Verilator 3.655 2007-11-27

Minor:

• Support "#delay <statement>;" with associated STMTDLY warning.
• Fix generate for loops with constant zero conditions. [Rodney Sinclair]
• Fix divide-by-zero errors in constant propagator. [Rodney Sinclair]
• Fix wrong result with obscure signed-shift underneath a "? :".
• Fix many internal memory leaks, and added leak detector.

Verilator 3.654 2007-10-18

Minor:

• Don't exit early if many warnings but no errors are found. [Stan Mayer]
• Fix parsing module #(parameter x,y) declarations. [Oleg Rodionov]
• Fix parsing system functions with empty parens. [Oleg Rodionov]

Verilator 3.653 2007-08-01

Minor:

• Support SystemVerilog ==? and !=? operators.
• Fix SC_LIBS missing from generated makefiles. [Ding Xiaoliang]

Verilator 3.652 2007-06-21

Minor:

• Report as many warning types as possible before exiting.
• Support V2K portlists with "input a,b,...". [Mark Nodine]
• Support V2K function/task argument lists.
• Optimize constant $display arguments.
• Fix preprocessor dropping some `line directives. [Mark Nodine]

Verilator 3.651 2007-05-22

Major:

• Add verilator_profcfunc utility. [Gene Weber]

Minor:

• Treat modules within `celldefine and `endcelldefine as if in library.
• Support functions which return integers. [Mark Nodine]
• Warn if flex is not installed. [Ralf Karge]
• Ignore `protect and `endprotect.
• Fix empty case/endcase blocks.

Verilator 3.650 2007-04-20

Major:

• Add --compiler msvc option. This is now required when Verilated code is to be run through MSVC++. This also enables fixing MSVC++ error C1061, blocks nested too deeply. [Ralf Karge]
• Add --lint-only option, to lint without creating other output.

Minor:

• Add /verilator lint_save/ and /verilator lint_restore/ to allow friendly control over re-enabling lint messages. [Gerald Williams]
• Support SystemVerilog .name and .* interconnect.
• Support while and do-while loops.
• Use $(LINK) instead of $(CXX) for Makefile link rules. [Gerald Williams]
• Add USER_CPPFLAGS and USER_LDFLAGS to Makefiles. [Gerald Williams]
• Fix compile errors under Windows MINGW compiler. [Gerald Williams]
• Fix dotted bit reference to local memory. [Eugene Weber]
• Fix 3.640 `verilog forcing IEEE 1364-1995 only. [David Hewson]

Verilator 3.640 2007-03-12

Minor:

• Support Verilog 2005 `begin_keywords and `end_keywords.
• Updated list of SystemVerilog keywords to correspond to IEEE 1800-2005.
• Add /verilator public_flat/. [Eugene Weber]
• Try all +libext's in the exact order given. [Michael Shinkarovsky]
• Fix elimination of public signals assigned to constants. [Eugene Weber]
• Fix internal error when public for loop has empty body. [David Addison]
• Fix "Loops detected" assertion when model exceeds 4GB. [David Hewson]
• Fix display %m names inside named blocks.

Verilator 3.633 2007-02-07

Minor:

• Add --trace-depth option for minimizing VCD file size. [Emerson Suguimoto]
• With VL_DEBUG, show wires causing convergence errors. [Mike Shinkarovsky]
• Fix isolate_assignments when many signals per always. [Mike Shinkarovsky]
• Fix isolate_assignments across task/func temporaries. [Mike Shinkarovsky]
• Fix $display's with array select followed by wide AND. [David Hewson]

Verilator 3.632 2007-01-17

Minor:

• Add /verilator isolate_assignments/ attribute. [Mike Shinkarovsky]

Verilator 3.631 2007-01-02

Major:

• Support standard NAME[#] for cells created by arraying or generate for. This replaces the non-standard name__# syntax used in earlier versions.

Minor:

• Fix again dotted references into generate cells. [David Hewson] Verilator no longer accepts duplicated variables inside unique generate blocks as this is illegal according to the specification.
• Fix $readmem* with filenames < 8 characters. [Emerson Suguimoto]

Verilator 3.630 2006-12-19

Major:

• Support $readmemb and $readmemh. [Eugene Weber, Arthur Kahlich]

Minor:

• When dotted signal lookup fails, help the user by showing known scopes.
• Fix to reduce depth of priority encoded case statements. [Eugene Weber]
• Fix configure and compiling under Solaris. [Bob Farrell]
• Fix dotted references inside generated cells. [David Hewson]
• Fix missed split optimization points underneath other re-split blocks.

Verilator 3.623 2006-12-05

Major:

• Add --output-split-cfuncs for accelerating GCC compile. [Eugene Weber]

Minor:

• Add M32 make variable to support -m32 compiles. [Eugene Weber]
• Fix $signed mis-extending when input has a WIDTH violation. [Eugene Weber]

Verilator 3.622 2006-10-17 Stable

Minor:

• Fix --skip-identical without --debug, broken in 3.621. [Andy Meier]

Verilator 3.621 2006-10-11 Beta

Major:

• Add /verilator no_inline_task/ to prevent over-expansion. [Eugene Weber]

Minor:

• Public functions now allow > 64 bit arguments.
• Remove .vpp intermediate files when not under --debug.
• Fix link error when using --exe with --trace. [Eugene Weber]
• Fix mis-optimization of wide concats with constants.
• Fix core dump on printing error when not under --debug. [Allan Cochrane]

Verilator 3.620 2006-10-04 Stable

Minor:

• Support simple inout task ports. [Eugene Weber]
• Allow overriding Perl, Flex and Bison versions. [by Robert Farrell]
• Optimize variables set to constants within basic blocks for ~3%.
• Default make no longer makes the docs; if you edit the documentation. sources, run "make info" to get them.
• Optimize additional Boolean identities (a|a = a, etc.)
• Fix coredump when dotted cross-ref inside task call. [Eugene Weber]
• Fix dotted variables in always sensitivity lists. [Allan Cochrane]

Verilator 3.610 2006-09-20 Stable

Minor:

• Verilator now works under DJGPP (Pentium GCC). [John Stroebel]
• Add default define for VL_PRINTF. [John Stroebel]
• Removed coverage request variable; see Coverage limitations in docs.
• Fix DOS carriage returns in multiline defines. [Ralf Karge]
• Fix printf format warnings on 64-bit linux.

Verilator 3.602 2006-09-11 Stable

Minor:

• Fix function references under top inlined module. [David Hewson]

Verilator 3.601 2006-09-06 Beta

Major:

• Add --inhibit-sim flag for environments using old __Vm_inhibitSim.
• Add `systemc_dtor for destructor extensions. [Allan Cochrane]
• Add -MP to make phony dependencies, ala GCC's.

Minor:

• Changed how internal functions are invoked to reduce aliasing. Useful when using GCC's -O2 or -fstrict-aliasing, to gain another ~4%.
• Declare optimized lookup tables as 'static', to reduce D-Cache miss rate.
• Fix memory leak when destroying modules. [John Stroebel]
• Fix coredump when unused modules have unused cells. [David Hewson]
• Fix 3.600 internal error with arrayed instances. [David Hewson]
• Fix 3.600 internal error with non-unrolled function loops. [David Hewson]
• Fix $display %m name not matching Verilog name inside SystemC modules.

Verilator 3.600 2006-08-28 Beta

Major:

• Support dotted cross-hierarchy variable and task references.

Minor:

• Lint for x's in generate case statements.
• Fix line numbers being off by one when first file starts with newline.
• Fix naming of generate for blocks to prevent non-inline name conflict.
• Fix redundant statements remaining after table optimization.

Verilator 3.542 2006-08-11 Stable

Minor:

• vl_finish and vl_fatal now print via VL_PRINTF rather then cerr/cout.
• Fix extraneous UNSIGNED warning when comparing genvars. [David Hewson]
• Fix extra white space in $display %c. [by David Addison]
• Fix missing VL_CONST_W_24X macro. [Bernard Deadman]

Verilator 3.541 2006-07-05 Beta

Minor:

• Add warning on changeDetect to arrayed structures. [David Hewson]
• Fix "// verilator lint_on" not re-enabling warnings. [David Hewson]
• Fix 3.540's multiple memory assignments to same block. [David Hewson]
• Fix non-zero start number for arrayed instantiations. [Jae Hossell]
• Fix GCC 4.0 header file warnings.

Verilator 3.540 2006-06-27 Beta

Minor:

• Optimize combo assignments that are used only once, ~5-25% faster.
• Optimize delayed assignments to memories inside loops, ~0-5% faster.
• Fix mis-width warning on bit selects of memories. [David Hewson]
• Fix mis-width warning on dead generate-if branches. [Jae Hossell]

Verilator 3.533 2006-06-05 Stable

Minor:

• Add PDF user manual, verilator.pdf.
• Fix delayed bit-selected arrayed assignments. [David Hewson]
• Fix execution path to Perl. [Shanshan Xu]
• Fix Bison compile errors in verilog.y. [by Ben Jackson]

Verilator 3.531 2006-05-10 Stable

Minor:

• Support $c routines which return 64 bit values.
• Fix `include `DEFINE.
• Fix Verilator core dump when have empty public function. [David.Hewson]

Verilator 3.530 2006-04-24 Stable

Major:

• $time is now 64 bits. The macro VL_TIME_I is now VL_TIME_Q, but calls the same sc_time_stamp() function to get the current time.

Verilator 3.523 2006-03-06 Stable

Minor:

• Fix error line numbers being off due to multi-line defines. [Mat Zeno]
• Fix GCC sign extending (uint64_t)(a<b). [David Hewson]
• Fix `systemc_imp_header "undefined macro" error.

Verilator 3.522 2006-02-23 Beta

Minor:

• Add UNUSED error message, for forward compatibility.

Verilator 3.521 2006-02-14 Beta

Major:

• Create new --coverage-line and --coverage-user options. [Peter Holmes]

Minor:

• Add SystemVerilog 'x,'z,'0,'1, and new string literals.
• Fix public module's parent still getting inlined.

Verilator 3.520 2006-01-14 Stable

Major:

• Support $fopen, $fclose, $fwrite, $fdisplay. See documentation, as the file descriptors differ from the standard.

Verilator 3.510 2005-12-17 Stable

Major:

• Improve trace-on performance on large multi-clock designs by 2x or more. This adds a small ~2% performance penalty if traces are compiled in, but not turned on. For best non-tracing performance, do not use --trace.

Minor:

• Fix $'s in specify delays causing bad PLI errors. [Mat Zeno]
• Fix public functions not setting up proper symbol table. [Mat Zeno]
• Fix genvars generating trace compile errors. [Mat Zeno]
• Fix VL_MULS_WWW compile error with MSVC++. [Wim Michiels]

Verilator 3.502 2005-11-30 Stable

Minor:

• Fix local non-IO variables in public functions and tasks.
• Fix bad lifetime optimization when same signal is assigned multiple times in both branch of an if. [Danny Ding]

Verilator 3.501 2005-11-16 Stable

Major:

• Add --prof-cfuncs for correlating profiles back to Verilog.

Minor:

• Fix functions where regs are declared before inputs. [Danny Ding]
• Fix bad deep expressions with bit-selects and rotate. [Prabhat Gupta]

Verilator 3.500 2005-10-30 Stable

Major:

• Support signed numbers, >>>, $signed, $unsigned. [MANY!]
• Support multi-dimensional arrays. [Eugen Fekete]
• Support very limited Property Specification Language (aka PSL or Sugar). The format and keywords are now very limited, but will grow with future releases. The --assert switch enables this feature.
• With --assert, generate assertions for synthesis parallel_case and full_case.

Minor:

• Fix generate if's with empty if/else blocks. [Mat Zeno]
• Fix generate for cell instantiations with same name. [Mat Zeno]

Verilator 3.481 2005-10-12 Stable

Minor:

• Add /verilator tracing_on/off/ for waveform control.
• Fix split optimization reordering $display statements.

Verilator 3.480 2005-09-27 Beta

Major:

• Allow coverage of flattened modules, and multiple points per line. Coverage analysis requires SystemPerl 1.230 or newer.

Minor:

• Add preprocessor changes to support meta-comments.
• Optimize sequential assignments of different bits of same bus; ~5% faster.
• Optimize away duplicate lookup tables.
• Optimize wide concatenates into individual words. [Ralf Karge]
• Optimize local variables from delayed array assignments.

Verilator 3.470 2005-09-06 Stable

Minor:

• Optimize staging flops under reset blocks.
• Add '-Werror-...' to upgrade specific warnings to errors.
• Add GCC branch prediction hints on generated if statements.
• Fix bad simulation when same function called twice in same expression.
• Fix preprocessor substitution of quoted parameterized defines.

Verilator 3.464 2005-08-24 Stable

Major:

• Add `systemc_imp_header, for use when using --output-split.
• Add --stats option to dump design statistics.

Minor:

• Fix core dump with clock inversion optimizations.

Verilator 3.463 2005-08-05 Stable

Minor:

• Fix case defaults when not last statement in case list. [Wim Michiels]

Verilator 3.462 2005-08-03 Stable

Minor:

• Fix reordering of delayed assignments to same memory index. [Wim Michiels]
• Fix compile error with Flex 2.5.1. [Jens Arm]
• Fix multiply-instantiated public tasks generating non-compilable code.

Verilator 3.461 2005-07-28 Beta

Minor:

• Fix compile error with older versions of bison. [Jeff Dutton]

Verilator 3.460 2005-07-27 Beta

Major:

• Add -output-split option to enable faster parallel GCC compiles. To support --output-split, the makefiles now split VM_CLASSES into VM_CLASSES_FAST and VM_CLASSES_SLOW. This may require a change to local makefiles.
• Support -v argument to read library files.

Minor:

• When issuing unoptimizable warning, show an example path.
• Internal tree dumps now indicate edit number that changed the node.
• Fix false warning when a clock is constant.
• Fix X/Z in decimal numbers. [Wim Michiels]
• Fix genvar statements in non-named generate blocks.
• Fix core dump when missing newline in `define. [David van der bokke]

Verilator 3.450 2005-07-12

Major:

• $finish will no longer exit, but set Verilated::gotFinish(). This enables support for final statements, and for other cleanup code. If this is undesired, redefine the vl_user_finish routine. Top level loops should use Verilated::gotFinish() as an exit condition for their loop, and then call top->final(). To prevent an infinite loop, a double $finish will still exit; this may be removed in future releases.
• Support SystemVerilog keywords $bits, $countones, $isunknown, $onehot, $onehot0, always_comb, always_ff, always_latch, finish.

Minor:

• Fix "=== 1'bx" to always be false, instead of random.

Verilator 3.440 2005-06-28 Stable

Major:

• Add Verilog 2001 generate for/if/case statements.

Verilator 3.431 2005-06-24 Stable

Minor:

• Fix selection bugs introduced in 3.430 beta.

Verilator 3.430 2005-06-22 Beta

Minor:

• Add Verilog 2001 variable part selects [n+:m] and [n-:m]. [Wim Michiels]

Verilator 3.422 2005-06-10 Stable

Minor:

• Add Verilog 2001 power (**) operator. [Danny Ding]
• Fix crash and added error message when assigning to inputs. [Ralf Karge]
• Fix tracing of modules with public functions.

Verilator 3.421 2005-06-02 Beta

Minor:

• Fix error about reserved word on non-public signals.
• Fix missing initialization compile errors in 3.420 beta. [Ralf Karge]

Verilator 3.420 2005-06-02 Beta

Minor:

• Performance improvements worth ~20%
• Add -x-assign options; ~5% faster if use -x-assign=0.
• Add error message when multiple defaults in case statement.
• Optimize shifts out of conditionals and if statements.
• Optimize local 'short' wires.
• Fix case defaults when not last statement in case list. [Ralf Karge]
• Fix crash when wire self-assigns x=x.
• Fix gate optimization with top-flattened modules. [Mahesh Kumashikar]

Verilator 3.411 2005-05-30 Stable

Minor:

• Fix compile error in GCC 2.96. [Jeff Dutton]

Verilator 3.410 2005-05-25 Beta

Major:

• Allow functions and tasks to be declared public. They will become public C++ functions, with appropriate C++ types. This allows users to make public accessor functions/tasks, instead of having to use public variables and `systemc_header hacks.

Minor:

• Skip producing output files if all inputs are identical This uses timestamps, similar to make. Disable with --no-skip-identical.
• Improved compile performance with large case statements.
• Fix internal error in V3Table. [Jeff Dutton]
• Fix compile error in GCC 2.96, and with SystemC 1.2. [Jeff Dutton]

Verilator 3.400 2005-04-29 Beta

Major:

• Internal changes to support future clocking features.
• Verilog-Perl and SystemPerl are no longer required for C++ or SystemC output. If you want tracing or coverage analysis, they are still needed.
• Add --sc to create pure SystemC output not requiring SystemPerl.
• Add --pins64 to create 64 bit SystemC outputs instead of sc_bv<64>.
• The --exe flag is now required to produce executables inside the makefile. This was previously the case any time .cpp files were passed on the command line.
• Add -O3 and --inline-mult for performance tuning. [Ralf Karge] One experiment regained 5% performance, at a cost of 300% in compile time.

Minor:

• Improved performance of large case/always statements with low fanin by converting to internal lookup tables (ROMs).
• Initialize SystemC port names. [S Shuba]
• Add Doxygen comments to Verilated includes.
• Fix -cc pins 8 bits wide and less to be uint8_t instead of uint16_t.
• Fix crash when Mdir has same name as .v file. [Gernot Koch]
• Fix crash with size mismatches on case items. [Gernot Koch]

Verilator 3.340 2005-02-18 Stable

Minor:

• Report misconnected pins across all modules, instead of just first error.
• Improved large netlist compile times.
• Fix over-active inlining, resulting in compile slowness.

Verilator 3.332 2005-01-27

Major:

• Add -E preprocess only flag, similar to GCC.
• Add CMPCONSTLR when comparison is constant due to > or < with all ones.

Minor:

• Fix loss of first -f file argument, introduced in 3.331.

Verilator 3.331 2005-01-18

Major:

• The Verilog::Perl preprocessor is now C++ code inside of Verilator. This improves performance, makes compilation easier, and enables some future features.

Minor:

• Support arrays of instantiations (non-primitives only). [Wim Michiels]
• Fix unlinked error with defparam. [Shawn Wang]

Verilator 3.320 2004-12-10

Major:

• NEWS is now renamed Changes, to support CPAN indexing.
• If Verilator is passed a C file, create a makefile link rule. This saves several user steps when compiling small projects.

Minor:

• Add new COMBDLY warning in place of fatal error. [Shawn Wang]
• Fix mis-simulation with wide-arrays under bit selects. [Ralf Karge]
• Add NC Verilog as alternative to VCS for reference tests.
• Support implicit wire declarations on input-only signals. (Dangerous, as leads to wires without drivers, but allowed by spec.)
• Fix compile warnings on Suse 9.1

Verilator 3.311 2004-11-29

Major:

• Support implicit wire declarations (as a warning). [Shawn Wang]

Minor:

• Fix over-shift difference in Verilog vs C++. [Ralf Karge]

Verilator 3.310 2004-11-15

Major:

• Support defparam.
• Support gate primitives: buf, not, and, nand, or, nor, xor, xnor.

Minor:

• Ignore all specify blocks.

Verilator 3.302 2004-11-12

Minor:

• Support NAND and NOR operators.
• Better warnings when port widths don't match.
• Fix internal error due to some port width mismatches. [Ralf Karge]
• Fix WIDTH warnings on modules that are only used parameterized, not in 'default' state.
• Fix selection of SystemC library on cygwin systems. [Shawn Wang]
• Fix runtime bit-selection of parameter constants.

Verilator 3.301 2004-11-04

Minor:

• Fix 64 bit [31:0] = {#{}} mis-simulation. [Ralf Karge]
• Fix shifts greater then word width mis-simulation. [Ralf Karge]
• Fix to work around GCC 2.96 negation bug.

Verilator 3.300 2004-10-21

Major:

• New backend that eliminates most VL macros. Improves performance 20%-50%, depending on frequency of use of signals over 64 bits. GCC compile times with -O2 shrink by a factor of 10.

Minor:

• Fix "setting unsigned int from signed value" warning.

Verilator 3.271 2004-10-21

Minor:

• Fix "loops detected" error with some negedge clocks.
• Fix some output code spacing issues.

Verilator 3.270 2004-10-15

Minor:

• Support Verilog 2001 parameters in module headers. [Ralf Karge]
• Faster code to support compilers not inlining all Verilated functions.
• Fix numeric fault when dividing by zero.

Verilator 3.260 2004-10-07

Major:

• Support Verilog 2001 named parameter instantiation. [Ralf Karge]

Minor:

• Return 1's when one bit wide extract indexes outside array bounds.
• Fix compile warnings on 64-bit operating systems.
• Fix incorrect dependency in .d file when setting VERILATOR_BIN.

Verilator 3.251 2004-09-09

Minor:

• Fix parenthesis overflow in Microsoft Visual C++ [Renga Sundararajan]

Verilator 3.250 2004-08-30

Major:

• Support Microsoft Visual C++ [Renga Sundararajan]

Minor:

• SystemPerl 1.161+ is required.

Verilator 3.241 2004-08-17

Minor:

• Support ,'s to separate multiple assignments. [Paul Nitza]
• Fix shift sign extension problem using non-GCC compilers.

Verilator 3.240 2004-08-13

Major:

• Verilator now uses 64 bit math where appropriate. Inputs and outputs of 33-64 bits wide to the C++ Verilated model must now be uint64_t's; SystemC has not changed, they will remain sc_bv's. This increases performance by ~ 9% on x86 machines, varying with how frequently 33-64 bit signals occur. Signals 9-16 bits wide are now stored as 16 bit shorts instead of longs, this aids cache packing.

Minor:

• Fix SystemC compile error with feedthrus. [Paul Nitza]
• Fix concat value error introduced in 3.230.

Verilator 3.230 2004-08-10

Minor:

• Add coverage output to test_sp example, SystemPerl 1.160+ is required.
• Fix time 0 value of signals. [Hans Van Antwerpen] Earlier versions would not evaluate some combinatorial signals until posedge/negedge blocks had been activated.
• Fix wide constant inputs to public submodules [Hans Van Antwerpen]
• Fix wide signal width extension bug. Only applies when width mismatch warnings were overridden.

Verilator 3.220 2004-06-22

Major:

• Many waveform tracing changes:
• Tracing is now supported on C++ standalone simulations. [John Brownlee]

Minor:

• When tracing, SystemPerl 1.150 or newer is required.
• When tracing, Verilator must be called with the --trace switch.
• Add SystemPerl example to documentation. [John Brownlee]
• Various Cygwin compilation fixes. [John Brownlee]

Verilator 3.210 2004-04-01

Major:

• Compiler optimization switches have changed See the BENCHMARKING section of the documentation.
• With Verilog-Perl 2.3 or newer, Verilator supports SystemVerilog preprocessor extensions.

Minor:

• Add localparam. [Thomas Hawkins]
• Add warnings for SystemVerilog reserved words.

Verilator 3.203 2004-03-10

Minor:

• Notes and repairs for Solaris. [Fred Ma]

Verilator 3.202 2004-01-27

Major:

• The beta version is now the primary release. See below for many changes. If you have many problems, you may wish to try release 3.125.
• Verilated::traceEverOn(true) must be called at time 0 if you will ever turn on tracing (waveform dumping) of signals. Future versions will need this switch to disable trace incompatible optimizations.

Minor:

• Optimize common replication operations.
• Fix several tracing bugs

Verilator 3.201-beta 2003-12-10

Major:

• BETA VERSION, USE 3.124 for stable release!

• Version 3.2XX includes an all new back-end. This includes automatic inlining, flattening of signals between hierarchy, and complete ordering of statements. This results in 60-300% execution speedups, though less pretty C++ output. Even better results are possible using GCC 3.2.2 (part of Redhat 9.1), as GCC has fixed some optimization problems which Verilator exposes.

  If you are using `systemc_ctor, beware pointers to submodules are now initialized after the constructor is called for a module, to avoid segfaults, move statements that reference subcells into initial statements.

• C++ Constructor that creates a verilog module may take a char* name. This name will be used to prefix any $display %m arguments, so users may distinguish between multiple Verilated modules in a single executable.

Verilator 3.125 2004-01-27

Minor:

• Optimize bit replications

Verilator 3.124 2003-12-05

Major:

• An optimized executable will be made by default, in addition to a debug executable. Invoking Verilator with --debug will pick the debug version.

Minor:

• Many minor invisible changes to support the next version.

Verilator 3.123 2003-11-10

Minor:

• Wide bus performance enhancements.
• Fix function call bug when width warning suppressed. [Leon Wildman]
• Fix __DOT__ compile problem with funcs in last revision. [Leon Wildman]

Verilator 3.122 2003-10-29

Major:

• Modules which are accessed from external code now must be marked with /verilator public_module/ unless they already contain public signals. To enforce this, private cell names now have a string prepended.

Minor:

• Fix replicated function calls in one statement. [Robert A. Clark]
• Fix function call bug when width warning suppressed. [Leon Wildman]

Verilator 3.121 2003-09-29

Minor:

• Support multiplication over 32 bits. [Chris Boumenot] Also improved speed of addition and subtraction over 32 bits.
• Detect bit selection out of range errors.
• Detect integer width errors.
• Fix width problems on function arguments. [Robert A. Clark]

Verilator 3.120 2003-09-24

Minor:

• $finish now exits the model (via vl_finish function).
• Support inputs/outputs in tasks.
• Support V2K "integer int = {INITIAL_VALUE};"
• Ignore floating point delay values. [Robert A. Clark]
• Ignore `celldefine, `endcelldefine, etc. [Robert A. Clark]
• Optimize reduction operators.
• Fix converting "ooo" into octal values.
• Fix $display("%x");

Verilator 3.112 2003-09-16

Minor:

• Fix functions in continuous assignments. [Robert A. Clark]
• Fix inlining of modules with 2-level deep outputs.

Verilator 3.111 2003-09-15

Minor:

• Fix declaration of functions before using that module. [Robert A. Clark]
• Fix module inlining bug with outputs.

Verilator 3.110 2003-09-12

Major:

• Support Verilog 2001 style input/output declarations. [Robert A. Clark]
• Support local vars in headers of function/tasks. [Leon Wildman]

Verilator 3.109 2003-08-28

Major:

• Support local variables in named begin blocks. [Leon Wildman]

Verilator 3.108 2003-08-11

Major:

• Support functions.

Minor:

• Signals 8 bits and shorter are now stored as chars instead of uint32_t's. This improves Dcache packing and improves performance by ~7%.
• $display now usually results in a single VL_PRINT rather then many.
• Optimize conditionals (?:)

Verilator 3.107 2003-07-15

Major:

• --private and --l2name are now the default, as this enables additional optimizations. Use --noprivate or --nol2name to get the older behavior.

Minor:

• Now support $display of binary and wide format data.
• Add detection of incomplete case statements, and added related optimizations worth ~4%.
• Work around flex bug in Redhat 8.0. [Eugene Weber]
• Add some additional C++ reserved words.
• Additional constant optimizations, ~5% speed improvement.

Verilator 3.106 2003-06-17

Major:

• $c can now take multiple expressions as arguments. For example $c("foo","bar(",32+1,");") will insert "foobar(33);" This makes it easier to pass the values of signals.
• Several changes to support future versions that may have signal-eliminating optimizations. Users should try to use these switch on designs, they will become the default in later versions.
• Add --private switch and /verilator public/ metacomment. This renames all signals so that compile errors will result if any signals referenced by C++ code are missing a /verilator public/ metacomment.
• With --l2name, the second level cell C++ cell is now named "v". Previously it was named based on the name of the verilog code. This means to get to signals, scope to "{topcell} ->v ->{mysignal}" instead of "{topcell} ->{verilogmod}. {mysignal}". This allows different modules to be substituted for the cell without requiring source changes.

Minor:

• Several cleanups for Redhat 8.0.

Verilator 3.105 2003-05-08

Minor:

• Fix more GCC 3.2 errors. [David Black]

Verilator 3.104 2003-04-30

Major:

• Indicate direction of ports with VL_IN and VL_OUT.
• Allow $c32, etc, to specify width of the $c statement for VCS.
• Numerous performance improvements, worth about 25%

Minor:

• Fix false "indent underflow" error inside `systemc_ctor sections.
• Fix missing ordering optimizations when outputs also used internally.
• Assign constant cell pins in initial blocks rather then every cycle.
• Promote subcell's combo logic to sequential evaluation when possible.
• Fix GCC 3.2 compile errors. [Narayan Bhagavatula]

Verilator 3.103 2003-01-28

Minor:

• Fix missing model evaluation when clock generated several levels of hierarchy across from where it is used as a clock. [Richard Myers]
• Fix sign-extension bug introduced in 3.102.

Verilator 3.102 2003-01-24

Minor:

• Fix sign-extension of X/Z's ("32'hx")

Verilator 3.101 2003-01-13

Minor:

• Fix 'parameter FOO=#'bXXXX' [Richard Myers]
• Allow spaces inside numbers ("32'h 1234") [Sam Gladstone]

Verilator 3.100 2002-12-23

Major:

• Support for simple tasks w/o vars or I/O. [Richard Myers]

Minor:

• Ignore DOS carriage returns in Linux files. [Richard Myers]

Verilator 3.012 2002-12-18

Minor:

• Fix parsing bug with casex statements containing case items with bit extracts of parameters. [Richard Myers]
• Fix bug which could cause writes of non-power-of-2 sized arrays to corrupt memory beyond the size of the array. [Dan Lussier]
• Fix bug which did not detect UNOPT problems caused by submodules. See the description in the verilator man page. [John Deroo]
• Fix compile with threaded Perl. [Ami Keren]

Verilator 3.010 2002-11-03

Major:

• Support SystemC 2.0.1. SystemPerl version 1.130 or newer is required.

Minor:

• Fix bug with inlined modules under other inlined modules. [Scott Bleiweiss]

Verilator 3.005 2002-10-21

Minor:

• Fix X's in case (not casex/z) to constant propagate correctly.
• Fix missing include. [Kurachi]

Verilator 3.004 2002-10-10

Minor:

• Add module_inline metacomment and associated optimizations.
• Allow coverage_block_off metacomment in place of `coverage_block_off. This prevents problems with Emacs AUTORESET. [Ray Strouble]
• Fix `coverage_block_off also disabling subsequent blocks.
• Fix unrolling of loops with multiple simple statements.
• Fix compile warnings on newer GCC. [Kurachi]
• Additional concatenation optimizations.

Verilator 3.003 2002-09-13

Minor:

• Now compiles on Windows 2000 with Cygwin.
• Fix bug with pin assignments to wide memories.
• Optimize wire assignments to constants.

Verilator 3.002 2002-08-19

Major:

• First public release of version 3.

Verilator 3.000 2002-08-03

Major:

• All new code base. Many changes too numerous to mention.

Minor:

• Approximately 4 times faster then Verilator 2.
• Support initial statements
• Support correct blocking/nonblocking assignments
• Support `defines across multiple modules
• Optimize call ordering, constant propagation, and dead code elimination.

Verilator 2.1.8 2002-04-03

Major:

• All applications must now link against include/verilated.cpp

Minor:

• Paths specified to verilator_make should be absolute, or be formed to allow for execution in the object directory (prepend ../ to each path.) This allows relative filenames for makes which hash and cache dependencies.
• Add warning when parameter constants are too large. [John Deroo]
• Add warning when x/?'s used in non-casez statements.
• Add warning when blocking assignments used in posedge blocks. [Dan Lussier]
• Split evaluation function into clocked and non-clocked, 20% perf gain.

Verilator 2.1.5 2001-12-01

Major:

• Add coverage analysis. In conjunction with SystemC provide line coverage reports, without SystemC, provide a hook to user written accumulation function. See --coverage option of verilator_make.

Minor:

• Relaxed multiply range checking
• Support for constants up to 128 bits
• Randomize values used when assigning to X's.
• Add -guard option of internal testing.
• Changed indentation in emitted code to be automatically generated.
• Fix corruption of assignments of signal over 32 bits with non-0 lsb.

Verilator 2.1.4 2001-11-16

Major:

• Add $c("c_commands();"); for embedding arbitrary C code in Verilog.

Verilator 2.1.3 2001-11-03

Major:

• Support for parameters.

Verilator 2.1.2 2001-10-25

Major:

• Verilog Errors now reference the .v file rather then the .vpp file.

Minor:

• Support strings in assignments: reg [31:0] foo = "STRG";
• Support %m in format strings. Ripped out old $info support, use Verilog-Perl's vpm program instead.
• Convert $stop to call of v_stop() which user can define.
• Fix bug where a==b==c would have wrong precedence rule.
• Fix bug where XNOR on odd-bit-widths (~^ or ^~) had bad value.

Verilator 2.1.1 2001-05-17

Major:

• New test_sp directory for System-Perl (SystemC) top level instantiation of the Verilated code, lower modules are still C++ code. (Experimental).
• New test_spp directory for Pure System-Perl (SystemC) where every module is true SystemC code. (Experimental)

Minor:

• Input ports are now loaded by pointer reference into the sub-cell. This is faster on I-386 machines, as the stack must be used when there are a large number of parameters. Also, this simplifies debugging as the value of input ports exists for tracing.
• Many code cleanups towards standard C++ style conventions.

Verilator 2.1.0 2001-05-08

Minor:

• Many code cleanups towards standard C++ style conventions.

Version history lost

Verilator 1.8 1996-07-08

[Versions 0 to 1.8 were by Paul Wasson] * Fix single bit in concat from instance output incorrect offset bug.

Verilator 1.7 1996-05-20

• Mask unused bits of DONTCAREs.

Verilator 1.6 1996-05-13

• Add fasttrace script

Verilator 1.5 1996-01-09

• Pass structure pointer into translated code, so multiple instances can use same functions.
• Fix static value concat on casex items.

Verilator 1.1 1995-03-30

• Bug fixes, added verimake_partial script, performance improvements.

Verilator 1.0c 1994-09-30

• Initial release of Verilator

Verilator 0.0 1994-07-08

• First code written.

Copyright

Copyright 2001-2023 by Wilson Snyder. This program is free software; you can redistribute it and/or modify it under the terms of either the GNU Lesser General Public License Version 3 or the Perl Artistic License Version 2.0.

SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0