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Adding check for OSXSAVE before checking xgetbv in cpu detection code.

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Fix for #1026
This commit is contained in:
Dmitry Babokin
2015-04-24 21:28:06 +03:00
parent 44cf9866cb
commit ad97d70a43
3 changed files with 58 additions and 47 deletions
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6
check_isa.cpp
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@@ -109,7 +109,8 @@ lGetSystemISA() {
// Call cpuid with eax=7, ecx=0
__cpuidex(info2, 7, 0);
if ((info2[1] & (1 << 5)) != 0 && // AVX2
if ((info[2] & (1 << 27)) != 0 && // OSXSAVE
(info2[1] & (1 << 5)) != 0 && // AVX2
(info2[1] & (1 << 16)) != 0 && // AVX512 F
__os_has_avx512_support()) {
// We need to verify that AVX2 is also available,
@@ -131,7 +132,8 @@ lGetSystemISA() {
// or whatever is available in the machine.
}
if ((info[2] & (1 << 28)) != 0 &&
if ((info[2] & (1 << 27)) != 0 && // OSXSAVE
(info[2] & (1 << 28)) != 0 &&
__os_has_avx_support()) { // AVX
// AVX1 for sure....
// Ivy Bridge?