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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 1158cff9ea
commit 5aa76de35f
1 changed files with 10 additions and 9 deletions
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19
src/cpuinfo/SDL_cpuinfo.c
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@ -262,15 +262,16 @@ 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))
#define cpuid(func, a, b, c, d) \ /* Use __cpuidex instead of __cpuid because ICL does not clear ecx register */
{ \ #define cpuid(func, a, b, c, d) \
int CPUInfo[4]; \ { \
__cpuid(CPUInfo, func); \ int CPUInfo[4]; \
a = CPUInfo[0]; \ __cpuidex(CPUInfo, func, 0); \
b = CPUInfo[1]; \ a = CPUInfo[0]; \
c = CPUInfo[2]; \ b = CPUInfo[1]; \
d = CPUInfo[3]; \ c = CPUInfo[2]; \
d = CPUInfo[3]; \
} }
#else #else
#define cpuid(func, a, b, c, d) \ #define cpuid(func, a, b, c, d) \