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Read AVX2 from the processor

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Avx2.IsSupported says whether the starter's own code may use AVX2, and the AOT
compiler fixes that at build time to its baseline, which has none. A published
starter told every player that their processor lacked AVX2. The check now reads
CPUID: AVX2 in leaf 7, AVX and OSXSAVE in leaf 1.
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maj00r
2026-11-03 20:29:18 +01:00
parent 6d8a6c36e7
commit 39d4ef0bc4
1 changed files with 17 additions and 1 deletions
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18
StarterNG/Infrastructure/CpuFeatures.cs
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@@ -12,5 +12,21 @@ public static class CpuFeatures
/// processor. Other architectures cannot run them at all, which is not this. /// processor. Other architectures cannot run them at all, which is not this.
/// </summary> /// </summary>
public static bool LacksAvx2 => public static bool LacksAvx2 =>
RuntimeInformation.ProcessArchitecture is Architecture.X64 or Architecture.X86 && !Avx2.IsSupported; RuntimeInformation.ProcessArchitecture is Architecture.X64 or Architecture.X86 && !HasAvx2();
/// <summary>
/// Asks the processor itself. Avx2.IsSupported only says whether the starter's own
/// code may use AVX2, and the AOT compiler fixes that at build time to its baseline,
/// which has no AVX2, so a published starter always read false.
/// </summary>
static bool HasAvx2()
{
if (!X86Base.IsSupported || X86Base.CpuId(0, 0).Eax < 7)
return false;
// Leaf 1 ECX: bit 27 the system saves the extended registers (OSXSAVE), bit 28 AVX.
// Leaf 7 EBX: bit 5 AVX2.
const int osxsaveAndAvx = (1 << 27) | (1 << 28);
return (X86Base.CpuId(1, 0).Ecx & osxsaveAndAvx) == osxsaveAndAvx &&
(X86Base.CpuId(7, 0).Ebx & (1 << 5)) != 0;
}
} }