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x86emitter: Fix Windows AVX2 detection 

Technically it did work, but it was undefined behaviour. Use __cpuidex,
which allows setting ecx as well.

Also fix the _xgetbv intrinsic - I have no idea how PCSX2 even
compiled on Windows.
This commit is contained in:
Jonathan Li 2015-11-29 10:52:50 +00:00
parent 7055e29670
commit 4d97089990
3 changed files with 10 additions and 7 deletions
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1
common/include/Pcsx2Defs.h
View File

@ -27,7 +27,6 @@
#ifdef _MSC_VER
# include <intrin.h>
extern "C" unsigned __int64 __xgetbv(int);
#else
# include <intrin_x86.h>
#endif

10
common/include/intrin_x86.h
View File

@ -96,11 +96,15 @@ static __inline__ __attribute__((always_inline)) s32 _InterlockedIncrement(volat
/*** System information ***/
static __inline__ __attribute__((always_inline)) void __cpuid(int CPUInfo[], const int InfoType)
{
// ECX allow to select the leaf. Leaf 0 is the one that you want to get, so I just xor the register
__asm__ __volatile__("xor %%ecx, %%ecx\n" "cpuid": "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : "a" (InfoType));
__asm__ __volatile__("cpuid": "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : "a" (InfoType));
}
static __inline__ __attribute__((always_inline)) unsigned long long __xgetbv(unsigned int index)
static __inline__ __attribute__((always_inline)) void __cpuidex(int CPUInfo[], const int level, const int count)
{
__asm__ __volatile__("cpuid": "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : "a" (level), "c" (count));
}
static __inline__ __attribute__((always_inline)) unsigned long long _xgetbv(unsigned int index)
{
unsigned int eax, edx;
__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));

6
common/src/x86emitter/cpudetect.cpp
View File

@ -210,8 +210,8 @@ void x86capabilities::Identify()
if ( cmds >= 0x00000007 )
{
// Note: ECX must be 0. I did it directly in the __cpuid asm instrinsic
__cpuid( regs, 0x00000007 );
// Note: ECX must be 0 for AVX2 detection.
__cpuidex( regs, 0x00000007, 0 );
SEFlag = regs[ 1 ];
}
@ -275,7 +275,7 @@ void x86capabilities::Identify()
if((Flags2 >> 27) & 1) // OSXSAVE
{
if((__xgetbv(0) & 6) == 6) // XFEATURE_ENABLED_MASK[2:1] = '11b' (XMM state and YMM state are enabled by OS).
if((_xgetbv(0) & 6) == 6) // XFEATURE_ENABLED_MASK[2:1] = '11b' (XMM state and YMM state are enabled by OS).
{
hasAVX = ( Flags2 >> 28 ) & 1; //avx
hasFMA = ( Flags2 >> 12 ) & 1; //fma