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Check AVX OS support in host cpu check code

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Dmitry Babokin
2013-10-28 22:19:09 +04:00
parent c1de753db6
commit a166eb7ea1
1 changed files with 18 additions and 1 deletions
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19
ispc.cpp
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@@ -102,6 +102,22 @@ static void __cpuidex(int info[4], int level, int count) {
}
#endif // !ISPC_IS_WINDOWS && !__ARM__
#if !defined(__arm__)
static bool __os_has_avx_support() {
#if defined(ISPC_IS_WINDOWS)
// Check if the OS will save the YMM registers
unsigned long long xcrFeatureMask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
return (xcrFeatureMask & 6) == 6;
#else // defined(ISPC_IS_WINDOWS)
// Check xgetbv; this uses a .byte sequence instead of the instruction
// directly because older assemblers do not include support for xgetbv and
// there is no easy way to conditionally compile based on the assembler used.
int rEAX, rEDX;
__asm__ __volatile__ (".byte 0x0f, 0x01, 0xd0" : "=a" (rEAX), "=d" (rEDX) : "c" (0));
return (rEAX & 6) == 6;
#endif // !defined(ISPC_IS_WINDOWS)
}
#endif // !__arm__
static const char *
lGetSystemISA() {
@@ -111,7 +127,8 @@ lGetSystemISA() {
int info[4];
__cpuid(info, 1);
if ((info[2] & (1 << 28)) != 0) { // AVX
if ((info[2] & (1 << 28)) != 0 &&
__os_has_avx_support()) { // AVX
// AVX1 for sure....
// Ivy Bridge?
if ((info[2] & (1 << 29)) != 0 && // F16C