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Merge pull request #9565 from kencooke/cpudetect-gcc-bugfix

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Fix bug that causes GCC not to detect AVX2
This commit is contained in:
Brad Hefta-Gaub 2017-01-31 11:11:35 -08:00 committed by GitHub
commit 3bbb57599b
1 changed files with 11 additions and 4 deletions
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15
libraries/shared/src/CPUDetect.h
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@ -134,7 +134,7 @@ static inline bool cpuSupportsAVX() {
result = true;
}
}
return result;
return result;
}
static inline bool cpuSupportsAVX2() {
@ -143,11 +143,18 @@ static inline bool cpuSupportsAVX2() {
bool result = false;
if (cpuSupportsAVX()) {
if (__get_cpuid(0x7, &eax, &ebx, &ecx, &edx) && ((ebx & MASK_AVX2) == MASK_AVX2)) {
result = true;
// 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;
}
}
}
return result;
return result;
}
#else