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cpuinfo: use __cpuidex instead of __cpuid

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The classic Intel Compiler does not clear the ecx register prior
to executing the cpuid opcode.
This commit is contained in:
Anonymous Maarten
2023-03-22 23:40:35 +01:00
committed by Anonymous Maarten
parent 904e4a6e7c
commit 09832c701c
1 changed files with 10 additions and 9 deletions
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5
src/cpuinfo/SDL_cpuinfo.c
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@@ -246,11 +246,12 @@ done:
__asm mov c, ecx \ __asm mov c, ecx \
__asm mov d, edx \ __asm mov d, edx \
} }
#elif defined(_MSC_VER) && defined(_M_X64) #elif (defined(_MSC_VER) && defined(_M_X64))
/* Use __cpuidex instead of __cpuid because ICL does not clear ecx register */
#define cpuid(func, a, b, c, d) \ #define cpuid(func, a, b, c, d) \
{ \ { \
int CPUInfo[4]; \ int CPUInfo[4]; \
__cpuid(CPUInfo, func); \ __cpuidex(CPUInfo, func, 0); \
a = CPUInfo[0]; \ a = CPUInfo[0]; \
b = CPUInfo[1]; \ b = CPUInfo[1]; \
c = CPUInfo[2]; \ c = CPUInfo[2]; \