From 4dd9be44619896b6af2005fba63f05a10f8e31f1 Mon Sep 17 00:00:00 2001 From: Trevor Gross Date: Mon, 29 Jul 2024 11:12:30 -0400 Subject: [PATCH 1/2] Enable `f16` tests on x86 and x86-64 Since the `compiler_builtins` update [1], ABI bugs on x86 should be resolved. Enable tests for f16 on these platforms now. `f16` math functions (`reliable_f16_math`) are still excluded because there is an LLVM crash for powi [2]. [1]: https://github.com/rust-lang/rust/pull/125016 [2]: https://github.com/llvm/llvm-project/issues/105747 --- library/std/build.rs | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/library/std/build.rs b/library/std/build.rs index 35a5977b6ebaf..26b8669d382d9 100644 --- a/library/std/build.rs +++ b/library/std/build.rs @@ -103,9 +103,6 @@ fn main() { ("arm64ec", _) => false, // MinGW ABI bugs ("x86_64", "windows") => false, - // x86 has ABI bugs that show up with optimizations. This should be partially fixed with - // the compiler-builtins update. - ("x86" | "x86_64", _) => false, // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee` ("powerpc" | "powerpc64", _) => false, // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee` @@ -140,17 +137,17 @@ fn main() { _ => false, }; - // These are currently empty, but will fill up as some platforms move from completely - // unreliable to reliable basics but unreliable math. + // Configure platforms that have reliable basics but may have unreliable math. // LLVM is currenlty adding missing routines, let has_reliable_f16_math = has_reliable_f16 && match (target_arch.as_str(), target_os.as_str()) { // FIXME: Disabled on Miri as the intrinsics are not implemented yet. _ if is_miri => false, - // Currently nothing special. Hooray! - // This will change as platforms gain better better support for standard ops but math - // lags behind. + // x86 has a crash for `powi`: + ("x86" | "x86_64", _) => false, + // Assume that working `f16` means working `f16` math for most platforms, since + // operations just go through `f32`. _ => true, }; From 186ff6a4401c2047be47b85f2cef373c8711a73e Mon Sep 17 00:00:00 2001 From: Trevor Gross Date: Mon, 29 Jul 2024 11:28:45 -0400 Subject: [PATCH 2/2] Change `f16` doctests in core to run on x86-64 Since `f16` now works on x86 and x86-64, change doctests to use this instead of aarch64. This is to make sure any changes get run in PR CI. --- library/core/src/num/f16.rs | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/library/core/src/num/f16.rs b/library/core/src/num/f16.rs index 41bd34a270238..c00bebadaadd0 100644 --- a/library/core/src/num/f16.rs +++ b/library/core/src/num/f16.rs @@ -261,7 +261,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let nan = f16::NAN; /// let f = 7.0_f16; @@ -293,7 +293,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let f = 7.0f16; /// let inf = f16::INFINITY; @@ -319,7 +319,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let f = 7.0f16; /// let inf: f16 = f16::INFINITY; @@ -347,7 +347,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let min = f16::MIN_POSITIVE; // 6.1035e-5 /// let max = f16::MAX; @@ -377,7 +377,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let min = f16::MIN_POSITIVE; // 6.1035e-5 /// let max = f16::MAX; @@ -409,7 +409,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// use std::num::FpCategory; /// @@ -867,7 +867,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let value = 4.6_f16; /// let rounded = unsafe { value.to_int_unchecked::() }; @@ -910,7 +910,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// # // FIXME(f16_f128): enable this once const casting works /// # // assert_ne!((1f16).to_bits(), 1f16 as u128); // to_bits() is not casting! @@ -958,7 +958,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let v = f16::from_bits(0x4a40); /// assert_eq!(v, 12.5); @@ -1071,7 +1071,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let value = f16::from_be_bytes([0x4a, 0x40]); /// assert_eq!(value, 12.5); @@ -1094,7 +1094,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let value = f16::from_le_bytes([0x40, 0x4a]); /// assert_eq!(value, 12.5); @@ -1124,7 +1124,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// let value = f16::from_ne_bytes(if cfg!(target_endian = "big") { /// [0x4a, 0x40] @@ -1257,7 +1257,7 @@ impl f16 { /// /// ``` /// #![feature(f16)] - /// # #[cfg(target_arch = "aarch64")] { // FIXME(f16_F128): rust-lang/rust#123885 + /// # #[cfg(target_arch = "x86_64")] { /// /// assert!((-3.0f16).clamp(-2.0, 1.0) == -2.0); /// assert!((0.0f16).clamp(-2.0, 1.0) == 0.0);