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common: Use GCC's _xgetbv definition from GCC 8.2 onwards 

The _xgetbv bug was fixed, so avoid using our own definition (again).
This commit is contained in:
Jonathan Li 2018-08-08 01:19:50 +01:00
parent 39b405648a
commit e8ed18feba
1 changed files with 5 additions and 1 deletions
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6
common/include/x86emitter/x86_intrin.h
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@ -50,7 +50,8 @@ static __inline__ __attribute__((always_inline)) void cpuid(int CPUInfo[], const
__cpuid(InfoType, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
}
// _xgetbv on gcc 8 is broken (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85684).
#if defined(__clang__) || __GNUC__ < 8 || (__GNUC__ == 8 && __GNUC_MINOR__ < 2)
// _xgetbv on gcc 8.1 is broken (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85684).
// It also isn't present on clang and earlier versions of gcc.
static __inline__ __attribute__((always_inline)) unsigned long long xgetbv(unsigned int index)
{
@ -60,6 +61,9 @@ static __inline__ __attribute__((always_inline)) unsigned long long xgetbv(unsig
: "c"(index));
return ((unsigned long long)edx << 32) | eax;
}
#else
#define xgetbv _xgetbv
#endif
#endif