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[X86] Enable EVEX512 when host CPU has AVX512 #90479

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Merged
merged 1 commit into from
Apr 30, 2024
+4 −1
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[X86] Enable EVEX512 when host CPU has AVX512 #90479

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5 changes: 4 additions & 1 deletion llvm/lib/TargetParser/Host.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1287,8 +1287,10 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf,
setFeature(X86::FEATURE_AVX2);
if (HasLeaf7 && ((EBX >> 8) & 1))
setFeature(X86::FEATURE_BMI2);
if (HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save)
if (HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save) {
setFeature(X86::FEATURE_AVX512F);
setFeature(X86::FEATURE_EVEX512);
}
if (HasLeaf7 && ((EBX >> 17) & 1) && HasAVX512Save)
setFeature(X86::FEATURE_AVX512DQ);
if (HasLeaf7 && ((EBX >> 19) & 1))
Expand Down Expand Up @@ -1799,6 +1801,7 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
Features["rtm"] = HasLeaf7 && ((EBX >> 11) & 1);
// AVX512 is only supported if the OS supports the context save for it.
Features["avx512f"] = HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save;
Features["evex512"] = Features["avx512f"];
Features["avx512dq"] = HasLeaf7 && ((EBX >> 17) & 1) && HasAVX512Save;
Features["rdseed"] = HasLeaf7 && ((EBX >> 18) & 1);
Features["adx"] = HasLeaf7 && ((EBX >> 19) & 1);
Expand Down