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Improved support for AVX512 #373

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Merged
merged 1 commit into from
Dec 16, 2023
Merged

Improved support for AVX512 #373

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2 changes: 1 addition & 1 deletion .github/workflows/compile.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ jobs:
- build: 'avx'
defines: '-DLLAMA_AVX2=OFF'
- build: 'avx512'
defines: '-DLLAMA_AVX512=ON'
defines: '-DLLAMA_AVX512=ON -LLAMA_AVX512_VBMI=ON -DLLAMA_AVX512_VNNI=ON'
runs-on: windows-latest
steps:
- uses: actions/checkout@v3
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27 changes: 24 additions & 3 deletions LLama/Native/NativeLibraryConfig.cs
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Expand Up @@ -194,10 +194,31 @@ private NativeLibraryConfig()
_avxLevel = AvxLevel.Avx;
if (System.Runtime.Intrinsics.X86.Avx2.IsSupported)
_avxLevel = AvxLevel.Avx2;
#if NET8_0_OR_GREATER
if (System.Runtime.Intrinsics.X86.Avx512F.IsSupported)

if (CheckAVX512())
_avxLevel = AvxLevel.Avx512;
}

private static bool CheckAVX512()
{
if (!System.Runtime.Intrinsics.X86.X86Base.IsSupported)
return false;

var (_, ebx, ecx, _) = System.Runtime.Intrinsics.X86.X86Base.CpuId(7, 0);

var vnni = (ecx & 0b_1000_0000_0000) != 0;

#if NET8_0_OR_GREATER
var f = System.Runtime.Intrinsics.X86.Avx512F.IsSupported;
var bw = System.Runtime.Intrinsics.X86.Avx512BW.IsSupported;
var vbmi = System.Runtime.Intrinsics.X86.Avx512Vbmi.IsSupported;
#else
var f = (ebx & (1 << 16)) != 0;
var bw = (ebx & (1 << 30)) != 0;
var vbmi = (ecx & 0b_0000_0000_0010) != 0;
#endif

return vnni && vbmi && bw && f;
}

/// <summary>
Expand Down Expand Up @@ -253,4 +274,4 @@ public override string ToString()
}
}
#endif
}
}