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Require avxvnni for avx10.2

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This commit is contained in:
sayantn
2026-02-25 06:17:53 +05:30
parent 859951e3c7
commit db18ecf263
2 changed files with 41 additions and 33 deletions
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compiler/rustc_target/src/target_features.rs
+5 -1
View File
@@ -392,7 +392,11 @@ pub fn toggle_allowed(&self) -> Result<(), &'static str> {
"avx512vpopcntdq",
],
),
("avx10.2", Unstable(sym::avx10_target_feature), &["avx10.1"]),
(
"avx10.2",
Unstable(sym::avx10_target_feature),
&["avx10.1", "avxvnni", "avxvnniint8", "avxvnniint16"],
),
("avx512bf16", Stable, &["avx512bw"]),
("avx512bitalg", Stable, &["avx512bw"]),
("avx512bw", Stable, &["avx512f"]),
library/std_detect/src/detect/os/x86.rs
+36 -32
View File
@@ -202,6 +202,28 @@ pub(crate) fn detect_features() -> cache::Initializer {
// Test `XCR0.APX[19]` with the mask `0b1000_0000_0000_0000_0000 == 0x80000`
let os_apx_support = xcr0 & 0x80000 == 0x80000;
if os_amx_support {
enable(extended_features_edx, 24, Feature::amx_tile);
enable(extended_features_edx, 25, Feature::amx_int8);
enable(extended_features_edx, 22, Feature::amx_bf16);
enable(extended_features_eax_leaf_1, 21, Feature::amx_fp16);
enable(extended_features_edx_leaf_1, 8, Feature::amx_complex);
if max_basic_leaf >= 0x1e {
let CpuidResult { eax: amx_feature_flags_eax, .. } =
__cpuid_count(0x1e_u32, 1);
enable(amx_feature_flags_eax, 4, Feature::amx_fp8);
enable(amx_feature_flags_eax, 6, Feature::amx_tf32);
enable(amx_feature_flags_eax, 7, Feature::amx_avx512);
enable(amx_feature_flags_eax, 8, Feature::amx_movrs);
}
}
if os_apx_support {
enable(extended_features_edx_leaf_1, 21, Feature::apxf);
}
// Only if the OS and the CPU support saving/restoring the AVX
// registers we enable `xsave` support:
if os_avx_support {
@@ -236,9 +258,10 @@ pub(crate) fn detect_features() -> cache::Initializer {
enable(extended_features_ebx, 5, Feature::avx2);
// "Short" versions of AVX512 instructions
enable(extended_features_eax_leaf_1, 4, Feature::avxvnni);
enable(extended_features_eax_leaf_1, 23, Feature::avxifma);
enable(extended_features_edx_leaf_1, 4, Feature::avxvnniint8);
let avxvnni = enable(extended_features_eax_leaf_1, 4, Feature::avxvnni);
let avxvnniint8 = enable(extended_features_eax_leaf_1, 23, Feature::avxifma);
let avxvnniint16 =
enable(extended_features_edx_leaf_1, 4, Feature::avxvnniint8);
enable(extended_features_edx_leaf_1, 5, Feature::avxneconvert);
enable(extended_features_edx_leaf_1, 10, Feature::avxvnniint16);
@@ -269,37 +292,18 @@ pub(crate) fn detect_features() -> cache::Initializer {
enable(extended_features_edx, 8, Feature::avx512vp2intersect);
enable(extended_features_edx, 23, Feature::avx512fp16);
enable(extended_features_eax_leaf_1, 5, Feature::avx512bf16);
}
}
if os_amx_support {
enable(extended_features_edx, 24, Feature::amx_tile);
enable(extended_features_edx, 25, Feature::amx_int8);
enable(extended_features_edx, 22, Feature::amx_bf16);
enable(extended_features_eax_leaf_1, 21, Feature::amx_fp16);
enable(extended_features_edx_leaf_1, 8, Feature::amx_complex);
let avx10_1 = enable(extended_features_edx_leaf_1, 19, Feature::avx10_1);
if avx10_1 {
let CpuidResult { ebx, .. } = __cpuid(0x24);
let avx10_version = ebx & 0xff;
if max_basic_leaf >= 0x1e {
let CpuidResult { eax: amx_feature_flags_eax, .. } =
__cpuid_count(0x1e_u32, 1);
enable(amx_feature_flags_eax, 4, Feature::amx_fp8);
enable(amx_feature_flags_eax, 6, Feature::amx_tf32);
enable(amx_feature_flags_eax, 7, Feature::amx_avx512);
enable(amx_feature_flags_eax, 8, Feature::amx_movrs);
}
}
if os_apx_support {
enable(extended_features_edx_leaf_1, 21, Feature::apxf);
}
let avx10_1 = enable(extended_features_edx_leaf_1, 19, Feature::avx10_1);
if avx10_1 {
let CpuidResult { ebx, .. } = __cpuid(0x24);
let avx10_version = ebx & 0xff;
if avx10_version >= 2 {
value.set(Feature::avx10_2 as u32);
// AVX10.2 supports masked versions of dot-product instructions available in avxvnni etc,
// so it doesn't make sense to have it without the unmasked versions
if avx10_version >= 2 && avxvnni && avxvnniint8 && avxvnniint16 {
value.set(Feature::avx10_2 as u32);
}
}
}
}
}