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Fix bug that causes GCC not to detect AVX2

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This commit is contained in:
Ken Cooke 2017-01-30 17:11:48 -08:00
parent 04ad35aeb1
commit 2ce357db3a
1 changed files with 11 additions and 4 deletions
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9
libraries/shared/src/CPUDetect.h
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@ -143,10 +143,17 @@ static inline bool cpuSupportsAVX2() {
bool result = false; bool result = false;
if (cpuSupportsAVX()) { if (cpuSupportsAVX()) {
if (__get_cpuid(0x7, &eax, &ebx, &ecx, &edx) && ((ebx & MASK_AVX2) == MASK_AVX2)) { // Work around a bug where __get_cpuid(0x7) returns wrong values on older GCC
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77756
if (__get_cpuid(0x0, &eax, &ebx, &ecx, &edx) && (eax >= 0x7)) {
__cpuid_count(0x7, 0x0, eax, ebx, ecx, edx);
if ((ebx & MASK_AVX2) == MASK_AVX2) {
result = true; result = true;
} }
} }
}
return result; return result;
} }