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feat: remove truncations which can be seen to be noops using type information #3953

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merged 18 commits into from
Jan 10, 2024

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@TomAFrench TomAFrench commented Jan 4, 2024

Description

Problem*

Resolves

Summary*

Truncates which occur on outputs of Binary(BinaryOp::Div) can sometimes be determined to be noops based on type information.

Put simply, if we have (numerator / constant_denom) as T then if type_of(numerator)::max / constant_denom fits inside T then we don't need to truncate the value.

Additional Context

Testing this on noir-rsa takes us from

+---------+----------------------+--------------+----------------------+
| Package | Expression Width     | ACIR Opcodes | Backend Circuit Size |
+---------+----------------------+--------------+----------------------+
| dkim    | Bounded { width: 3 } | 1649234      | 3049613              |
+---------+----------------------+--------------+----------------------+

to

+---------+----------------------+--------------+----------------------+
| Package | Expression Width     | ACIR Opcodes | Backend Circuit Size |
+---------+----------------------+--------------+----------------------+
| dkim    | Bounded { width: 3 } | 1486175      | 2764246              |
+---------+----------------------+--------------+----------------------+

Documentation*

Check one:

  • No documentation needed.
  • Documentation included in this PR.
  • [Exceptional Case] Documentation to be submitted in a separate PR.

PR Checklist*

  • I have tested the changes locally.
  • I have formatted the changes with Prettier and/or cargo fmt on default settings.

@TomAFrench TomAFrench changed the title feat: remove truncations of the output of divisions which ensure truncation is noop feat: remove truncations which can be seen to be noops using type information Jan 4, 2024
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github-actions bot commented Jan 4, 2024

Changes to circuit sizes

Generated at commit: af98346f989131f3817ff6892164c1134a3c3606, compared to commit: 5be049eee6c342649462282ee04f6411e6ea392c

🧾 Summary (10% most significant diffs)

Program ACIR opcodes (+/-) % Circuit size (+/-) %
regression -20 ✅ -8.13% 0 ➖ 0.00%

Full diff report 👇
Program ACIR opcodes (+/-) % Circuit size (+/-) %
regression 226 (-20) -8.13% 4,130 (0) 0.00%

@TomAFrench TomAFrench force-pushed the tf/trunc-after-div branch 2 times, most recently from f37fa83 to c1eb716 Compare January 4, 2024 16:58
@TomAFrench TomAFrench force-pushed the tf/trunc-after-div branch 2 times, most recently from 233ee40 to 3aec04f Compare January 8, 2024 11:17
Base automatically changed from tf/unsafe-casts to master January 8, 2024 18:41
@TomAFrench TomAFrench marked this pull request as ready for review January 8, 2024 18:47
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Looks good. Should we have a test for this optimization though? I noticed none of our tests were affected by this at all.

@TomAFrench
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Yep, I should add some tests for this as there's scope for off-by-one errors. Will do that before we merge this.

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I've added a test showing the two relevant edgecases. There's a good deal of code duplication between them but there doesn't seem to be a nice way to encapsulate the building of the SSA while still having the access to variables needed for the test.

We could in future move these tests to sit in function_builder as what we're really testing is the simplifications made as an instruction is inserted rather than anything innately related to the constant folding pass. We can then rewrite the test to not use constant folding at all which will allow more code reuse.

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Thanks!

@jfecher jfecher added this pull request to the merge queue Jan 10, 2024
Merged via the queue into master with commit cc3c2c2 Jan 10, 2024
30 checks passed
@jfecher jfecher deleted the tf/trunc-after-div branch January 10, 2024 14:34
TomAFrench added a commit that referenced this pull request Jan 11, 2024
* master:
  chore(ci): disable commit comments on docs publishing (#3998)
  feat: simplify chains of casts to be all in terms of the original `ValueId` (#3984)
  chore: quiet down aztec-bot! (#4006)
  chore: force public functions for trait implementation (#3986)
  feat: docker testing flow (#3895)
  feat: decompose `Instruction::Constrain` into multiple more basic constraints (#3892)
  feat: remove truncation from brillig casts (#3997)
  chore: add test case showing reexports (#4001)
  feat: remove truncations which can be seen to be noops using type information (#3953)
  chore: remove homemade keccakf1600 implementation (#3996)
TomAFrench added a commit that referenced this pull request Jan 12, 2024
* master: (285 commits)
  feat: Add `assert_max_bit_size` method to `Field` (#4016)
  fix: fixup exports from `noir_wasm` (#4022)
  chore(ci): fix docker CI (#4014)
  feat(lsp): goto trait method declaration (#3991)
  chore: add action to check for dead links (#3992)
  chore: improve cspell setup (#3985)
  feat: Add dependency resolver for `noir_wasm` and implement `FileManager` for consistency with native interface (#3891)
  chore(docs): devcontainer docs (#4007)
  chore(ci): disable commit comments on docs publishing (#3998)
  feat: simplify chains of casts to be all in terms of the original `ValueId` (#3984)
  chore: quiet down aztec-bot! (#4006)
  chore: force public functions for trait implementation (#3986)
  feat: docker testing flow (#3895)
  feat: decompose `Instruction::Constrain` into multiple more basic constraints (#3892)
  feat: remove truncation from brillig casts (#3997)
  chore: add test case showing reexports (#4001)
  feat: remove truncations which can be seen to be noops using type information (#3953)
  chore: remove homemade keccakf1600 implementation (#3996)
  feat!: Breaking changes from aztec-packages (#3955)
  chore(docs): small grammar fix on the landing page (#3989)
  ...
github-merge-queue bot pushed a commit that referenced this pull request Jan 22, 2024
🤖 I have created a release *beep* *boop*
---


<details><summary>0.23.0</summary>

## [0.23.0](v0.22.0...v0.23.0)
(2024-01-22)


### ⚠ BREAKING CHANGES

* Ban nested slices
([#4018](#4018))
* Breaking changes from aztec-packages
([#3955](#3955))
* Rename Arithmetic opcode to AssertZero
([#3840](#3840))
* remove circuit methods from noir_wasm
([#3869](#3869))

### Features

* Add `assert_max_bit_size` method to `Field`
([#4016](#4016))
([bc9a44f](bc9a44f))
* Add `noir-compiler` checks to `aztec_macros`
([#4031](#4031))
([420a5c7](420a5c7))
* Add a `--force` flag to force a full recompile
([#4054](#4054))
([27a8e68](27a8e68))
* Add dependency resolver for `noir_wasm` and implement `FileManager`
for consistency with native interface
([#3891](#3891))
([c29c7d7](c29c7d7))
* Add foreign call support to `noir_codegen` functions
([#3933](#3933))
([e5e52a8](e5e52a8))
* Add MVP `nargo export` command
([#3870](#3870))
([fbb51ed](fbb51ed))
* Add support for codegenning multiple functions which use the same
structs in their interface
([#3868](#3868))
([1dcfcc5](1dcfcc5))
* Added efficient field comparisons for bn254
([#4042](#4042))
([1f9cad0](1f9cad0))
* Assert maximum bit size when creating a U128 from an integer
([#4024](#4024))
([8f9c7e4](8f9c7e4))
* Avoid unnecessary range checks by inspecting instructions for casts
([#4039](#4039))
([378c18e](378c18e))
* Breaking changes from aztec-packages
([#3955](#3955))
([5be049e](5be049e))
* Bubble up `Instruction::Constrain`s to be applied as early as
possible. ([#4065](#4065))
([66f5cdd](66f5cdd))
* Cached LSP parsing
([#4083](#4083))
([b4f724e](b4f724e))
* Comparison for signed integers
([#3873](#3873))
([bcbd49b](bcbd49b))
* Decompose `Instruction::Cast` to have an explicit truncation
instruction ([#3946](#3946))
([35f18ef](35f18ef))
* Decompose `Instruction::Constrain` into multiple more basic
constraints ([#3892](#3892))
([51cf9d3](51cf9d3))
* Docker testing flow
([#3895](#3895))
([179c90d](179c90d))
* Extract parsing to its own pass and do it in parallel
([#4063](#4063))
([569cbbc](569cbbc))
* Implement `Eq` trait on curve points
([#3944](#3944))
([abf751a](abf751a))
* Implement DAP protocol in Nargo
([#3627](#3627))
([13834d4](13834d4))
* Implement generic traits
([#4000](#4000))
([916fd15](916fd15))
* Implement Operator Overloading
([#3931](#3931))
([4b16090](4b16090))
* **lsp:** Cache definitions for goto requests
([#3930](#3930))
([4a2140f](4a2140f))
* **lsp:** Goto global
([#4043](#4043))
([15237b3](15237b3))
* **lsp:** Goto struct member inside Impl method
([#3918](#3918))
([99c2c5a](99c2c5a))
* **lsp:** Goto trait from trait impl
([#3956](#3956))
([eb566e2](eb566e2))
* **lsp:** Goto trait method declaration
([#3991](#3991))
([eb79166](eb79166))
* **lsp:** Goto type alias
([#4061](#4061))
([dc83385](dc83385))
* **lsp:** Goto type definition
([#4029](#4029))
([8bb4ddf](8bb4ddf))
* **lsp:** Re-add code lens feature with improved performance
([#3829](#3829))
([8f5cd6c](8f5cd6c))
* Optimize array ops for arrays of structs
([#4027](#4027))
([c9ec0d8](c9ec0d8))
* Optimize logic gate ACIR-gen
([#3897](#3897))
([926460a](926460a))
* Prefer `AcirContext`-native methods for performing logic operations
([#3898](#3898))
([0ec39b8](0ec39b8))
* Remove range constraints from witnesses which are constrained to be
constants ([#3928](#3928))
([afe9c7a](afe9c7a))
* Remove truncation from brillig casts
([#3997](#3997))
([857ff97](857ff97))
* Remove truncations which can be seen to be noops using type
information ([#3953](#3953))
([cc3c2c2](cc3c2c2))
* Remove unnecessary predicate from `Lt` instruction
([#3922](#3922))
([a63433f](a63433f))
* Simplify chains of casts to be all in terms of the original `ValueId`
([#3984](#3984))
([2384d3e](2384d3e))
* Simplify multiplications by `0` or `1` in ACIR gen
([#3924](#3924))
([e58844d](e58844d))
* Support for u128
([#3913](#3913))
([b4911dc](b4911dc))
* Support printing more types
([#4071](#4071))
([f5c4632](f5c4632))
* Sync `aztec-packages`
([#4011](#4011))
([fee2452](fee2452))
* Sync commits from `aztec-packages`
([#4068](#4068))
([7a8f3a3](7a8f3a3))
* Use singleton `WasmBlackBoxFunctionSolver` in `noir_js`
([#3966](#3966))
([10b28de](10b28de))


### Bug Fixes

* Acir gen doesn't panic on unsupported BB function
([#3866](#3866))
([34fd978](34fd978))
* Allow abi encoding arrays of structs from JS
([#3867](#3867))
([9b713f8](9b713f8))
* Allow abi encoding tuples from JS
([#3894](#3894))
([f7fa181](f7fa181))
* Allow ast when macro errors
([#4005](#4005))
([efccec3](efccec3))
* Allow lsp to run inside of a docker container
([#3876](#3876))
([2529977](2529977))
* Bit-shifts for signed integers
([#3890](#3890))
([6ddd98a](6ddd98a))
* Checks for cyclic dependencies
([#3699](#3699))
([642011a](642011a))
* **debugger:** Crash when stepping through locations spanning multiple
lines ([#3920](#3920))
([223e860](223e860))
* Don't fail if no tests and the user didn't provide a pattern
([#3864](#3864))
([decbd0f](decbd0f))
* Fix advisory issue in cargo-deny
([#4077](#4077))
([19baea0](19baea0))
* Fixing dark mode background on the CTA button
([#3882](#3882))
([57eae42](57eae42))
* Fixup exports from `noir_wasm`
([#4022](#4022))
([358cdd2](358cdd2))
* Handle multiple imports in the same file
([#3903](#3903))
([219423e](219423e))
* Hoist constraints on inputs to top of program
([#4076](#4076))
([447aa34](447aa34))
* Implement missing codegen for `BlackBoxFunc::EcdsaSecp256r1` in
brillig ([#3943](#3943))
([2c5eceb](2c5eceb))
* Improve `nargo test` output
([#3973](#3973))
([3ab5ff4](3ab5ff4))
* Make `constant_to_radix` emit a slice instead of an array
([#4049](#4049))
([5cdb1d0](5cdb1d0))
* Operator overloading & static trait method references resolving to
generic impls ([#3967](#3967))
([f1de8fa](f1de8fa))
* Preserve brillig entrypoint functions without arguments
([#3951](#3951))
([1111465](1111465))
* Prevent `Instruction::Constrain`s for non-primitive types
([#3916](#3916))
([467948f](467948f))
* Remove panic for adding an invalid crate name in wasm compiler
([#3977](#3977))
([7a1baa5](7a1baa5))
* Return error rather instead of panicking on invalid circuit
([#3976](#3976))
([67201bf](67201bf))
* Search all levels of struct nesting before codegenning primitive types
([#3970](#3970))
([13ae014](13ae014))
* Update generics docs to mention we have traits now
([#3980](#3980))
([c2acdf1](c2acdf1))


### Miscellaneous Chores

* Ban nested slices
([#4018](#4018))
([f8a1fb7](f8a1fb7))
* Remove circuit methods from noir_wasm
([#3869](#3869))
([12d884e](12d884e))
* Rename Arithmetic opcode to AssertZero
([#3840](#3840))
([836f171](836f171))
</details>

<details><summary>0.39.0</summary>

## [0.39.0](v0.38.0...v0.39.0)
(2024-01-22)


### ⚠ BREAKING CHANGES

* Breaking changes from aztec-packages
([#3955](#3955))
* Rename Arithmetic opcode to AssertZero
([#3840](#3840))
* Remove unused methods on ACIR opcodes
([#3841](#3841))
* Remove partial backend feature
([#3805](#3805))

### Features

* Aztec-packages
([#3754](#3754))
([c043265](c043265))
* Breaking changes from aztec-packages
([#3955](#3955))
([5be049e](5be049e))
* Remove range constraints from witnesses which are constrained to be
constants ([#3928](#3928))
([afe9c7a](afe9c7a))
* Speed up transformation of debug messages
([#3815](#3815))
([2a8af1e](2a8af1e))
* Sync `aztec-packages`
([#4011](#4011))
([fee2452](fee2452))
* Sync commits from `aztec-packages`
([#4068](#4068))
([7a8f3a3](7a8f3a3))


### Bug Fixes

* Deserialize odd length hex literals
([#3747](#3747))
([4000fb2](4000fb2))
* Return error rather instead of panicking on invalid circuit
([#3976](#3976))
([67201bf](67201bf))


### Miscellaneous Chores

* Remove partial backend feature
([#3805](#3805))
([0383100](0383100))
* Remove unused methods on ACIR opcodes
([#3841](#3841))
([9e5d0e8](9e5d0e8))
* Rename Arithmetic opcode to AssertZero
([#3840](#3840))
([836f171](836f171))
</details>

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

---------

Co-authored-by: TomAFrench <[email protected]>
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