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Convert XGETBV to equivalent byte form in GetXCR0Eax (#69)

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osxcross (https://github.com/tpoechtrager/osxcross) gives the following error, which also happens with regular gcc on OS X (https://github.com/asmjit/asmjit/issues/78):
```
cpu_features/src/cpuinfo_x86.c:44:no such instruction: `XGETBV'
```
This commit is contained in:
natanbc 2019-03-20 06:04:24 -03:00 committed by Guillaume Chatelet
parent 7806502271
commit 084ec5cd0f
1 changed files with 4 additions and 1 deletions
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5
src/cpuinfo_x86.c
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@ -41,7 +41,10 @@ Leaf CpuId(uint32_t leaf_id) {
uint32_t GetXCR0Eax(void) {
uint32_t eax, edx;
__asm("XGETBV" : "=a"(eax), "=d"(edx) : "c"(0));
/* named form of xgetbv not supported on OSX, so must use byte form, see:
https://github.com/asmjit/asmjit/issues/78
*/
__asm(".byte 0x0F, 0x01, 0xd0" : "=a"(eax), "=d"(edx) : "c"(0));
return eax;
}