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(0.48) x86: add option to disable AVX-512 #20360

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Oct 16, 2024
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(0.48) x86: add option to disable AVX-512 #20360

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23 changes: 23 additions & 0 deletions runtime/compiler/x/env/J9CPU.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,29 @@ J9::X86::CPU::supportsFeature(uint32_t feature)
TR_ASSERT_FATAL(TRUE == omrsysinfo_processor_has_feature(&_supportedFeatureMasks, feature), "New processor feature usage detected, please add feature %d to _supportedFeatureMasks via TR::CPU::enableFeatureMasks()\n", feature);
}

static bool disableAVX512 = feGetEnv("TR_DisableAVX512");

if (disableAVX512)
{
switch (feature)
{
case OMR_FEATURE_X86_AVX512F:
case OMR_FEATURE_X86_AVX512VL:
case OMR_FEATURE_X86_AVX512BW:
case OMR_FEATURE_X86_AVX512DQ:
case OMR_FEATURE_X86_AVX512CD:
case OMR_FEATURE_X86_AVX512ER:
case OMR_FEATURE_X86_AVX512PF:
case OMR_FEATURE_X86_AVX512_BITALG:
case OMR_FEATURE_X86_AVX512_IFMA:
case OMR_FEATURE_X86_AVX512_VBMI:
case OMR_FEATURE_X86_AVX512_VBMI2:
case OMR_FEATURE_X86_AVX512_VNNI:
case OMR_FEATURE_X86_AVX512_VPOPCNTDQ:
return false;
}
}

return TRUE == omrsysinfo_processor_has_feature(&_processorDescription, feature);
}

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