Use minipal_getcpufeatures to detect for AVX

[cshung]

This should fix #112897

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[am11]

It could be OS-agnostic cshung/runtime@public/fix-avx-detection...am11:runtime:public/fix-avx-detection.

[mrsharm]

Testing

Successfully tested.

Modified code for testing:

SupportedISA DetermineSupportedISA()
{
    int cpuFeatures = minipal_getcpufeatures();
    if ((cpuFeatures & XArchIntrinsicConstants_Avx2) != 0)
    {
        printf( "Has AVX2 \n");
        if ((cpuFeatures & XArchIntrinsicConstants_Avx512) != 0)
        {
            printf( "Has AVX-512 \n");
            return (SupportedISA)((int)SupportedISA::AVX2 | (int)SupportedISA::AVX512F);
        }
        else
            return SupportedISA::AVX2;
    }
    else
    {
        printf( "Doesn't have AVX2 \n");
        return SupportedISA::None;
    }
}

Testing on a Machine with AVX-2 but not AVX-512.

Processor: AMD EPYC 7763 64-Core Processor

Windows

 .\corerun.exe .\GCPerfSim.dll -- -tc 16 -tagb 5 -tlgb 2 -lohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0
Has AVX2

Linux

./corerun GCPerfSim.dll -- -tc 16 -tagb 5 -tlgb
2 -lohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0
Has AVX2

Testing on a Machine with AVX-512

Windows

./corerun ,exe GCPerfSim.dll --  -tc 16 -tagb 5 -tlgb 2 -l
ohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0
Has AVX2
Has AVX-512

Linux

.\corerun .\GCPerfSim.dll --  -tc 16 -tagb 5 -tlgb 2 -lohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0
Has AVX2
Has AVX-512

Testing on a Machine with AVX* disabled

bcdedit /set xsavedisable 1 to disable AVX*.

Windows

corerun.exe GCPerfSim.dll --  -tc 16 -tagb 5 -tlgb 2 -lohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0 
Doesn't have AVX2

Linux

./corerun GCPerfSim.dll --  -tc 16 -tagb 5 -tlgb 2 -lohpi 0 -sohsi 50 -ramb 20 -rlmb 2 -sohpi 0
Doesn't have AVX2

[mrsharm]

LGTM! Tested extensively.

[EgorBo]

Should it be backported?

[mangod9]

yeah trying to validate the fix, and determine priority since it doesnt seem to be failing broadly across all hardware as far as we can tell, so guessing its not certain CPU skus.