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Rollup merge of #138003 - sayantn:new-amx, r=Amanieu

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Add the new `amx` target features and the `movrs` target feature

Adds 5 new `amx` target features included in LLVM20. These are guarded under `x86_amx_intrinsics` (#126622)

 - `amx-avx512`
 - `amx-fp8`
 - `amx-movrs`
 - `amx-tf32`
 - `amx-transpose`

Adds the `movrs` target feature (from #137976).

`@rustbot` label O-x86_64 O-x86_32 T-compiler A-target-feature
r? `@Amanieu`
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Stuart Cook 2025-04-02 13:10:36 +11:00 • committed by GitHub
commit 5b0f658922
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6
compiler/rustc_target/src/target_features.rs
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@ -380,11 +380,16 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
// tidy-alphabetical-start
("adx", Stable, &[]),
("aes", Stable, &["sse2"]),
("amx-avx512", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-bf16", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-complex", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-fp16", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-fp8", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-int8", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-movrs", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-tf32", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("amx-tile", Unstable(sym::x86_amx_intrinsics), &[]),
("amx-transpose", Unstable(sym::x86_amx_intrinsics), &["amx-tile"]),
("avx", Stable, &["sse4.2"]),
("avx2", Stable, &["avx"]),
("avx512bf16", Unstable(sym::avx512_target_feature), &["avx512bw"]),
@ -418,6 +423,7 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
("lahfsahf", Unstable(sym::lahfsahf_target_feature), &[]),
("lzcnt", Stable, &[]),
("movbe", Stable, &[]),
("movrs", Unstable(sym::movrs_target_feature), &[]),
("pclmulqdq", Stable, &["sse2"]),
("popcnt", Stable, &[]),
("prfchw", Unstable(sym::prfchw_target_feature), &[]),