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Merge pull request #2620 from stweil/simd

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simd: Check whether the OS supports FMA, AVX, ...
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Egor Pugin 2019-08-17 08:31:54 +03:00 committed by GitHub
commit 0a3a351cb3
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1 changed files with 3 additions and 2 deletions
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src/arch/simddetect.cpp
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@ -120,18 +120,19 @@ SIMDDetect::SIMDDetect() {
__cpuid(cpuInfo, 0);
max_function_id = cpuInfo[0];
if (max_function_id >= 1) {
bool xmm_ymm_state_enabled = (_xgetbv(0) & 6) == 6;
__cpuid(cpuInfo, 1);
#if defined(SSE4_1)
sse_available_ = (cpuInfo[2] & 0x00080000) != 0;
#endif
#if defined(FMA)
fma_available_ = (cpuInfo[2] & 0x00001000) != 0;
fma_available_ = xmm_ymm_state_enabled && (cpuInfo[2] & 0x00001000) != 0;
#endif
#if defined(AVX)
avx_available_ = (cpuInfo[2] & 0x10000000) != 0;
#endif
#if defined(AVX2)
if (max_function_id >= 7) {
if (max_function_id >= 7 && xmm_ymm_state_enabled) {
__cpuid(cpuInfo, 7);
avx2_available_ = (cpuInfo[1] & 0x00000020) != 0;
avx512F_available_ = (cpuInfo[1] & 0x00010000) != 0;