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Merge pull request #188 from gjaegy/master

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fix crash on CPU not having AVX support
This commit is contained in:
erwincoumans
2014-06-30 12:13:26 -07:00
parent 791b5149f6 f2e54ea0a5
commit 473c2d43bf
1 changed files with 8 additions and 2 deletions
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10
src/LinearMath/btCpuFeatureUtility.h
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@@ -55,10 +55,16 @@ public:
{ {
int cpuInfo[4]; int cpuInfo[4];
memset(cpuInfo, 0, sizeof(cpuInfo)); memset(cpuInfo, 0, sizeof(cpuInfo));
unsigned long long sseExt; unsigned long long sseExt = 0;
__cpuid(cpuInfo, 1); __cpuid(cpuInfo, 1);
sseExt = _xgetbv(0);
bool osUsesXSAVE_XRSTORE = cpuInfo[2] & (1 << 27) || false;
bool cpuAVXSuport = cpuInfo[2] & (1 << 28) || false;
if (osUsesXSAVE_XRSTORE && cpuAVXSuport)
{
sseExt = _xgetbv(0);
}
const int OSXSAVEFlag = (1UL << 27); const int OSXSAVEFlag = (1UL << 27);
const int AVXFlag = ((1UL << 28) | OSXSAVEFlag); const int AVXFlag = ((1UL << 28) | OSXSAVEFlag);
const int FMAFlag = ((1UL << 12) | AVXFlag | OSXSAVEFlag); const int FMAFlag = ((1UL << 12) | AVXFlag | OSXSAVEFlag);