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For CPUID, save EBX on the stack instead of in a register. 

This fixes GCC running out of registers when compiling for x86
in release mode.

Thanks to kiesel.
This commit is contained in:
Maarten ter Huurne 2011-12-12 02:14:56 +01:00
parent d75f45979b
commit ee5a29e6f2
1 changed files with 8 additions and 10 deletions
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18
Source/Core/Common/Src/CPUDetect.cpp
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@ -43,29 +43,27 @@ static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
// Note: EBX is reserved on Mac OS X and in PIC on Linux, so it has to // Note: EBX is reserved on Mac OS X and in PIC on Linux, so it has to
// restored at the end of the asm block. // restored at the end of the asm block.
__asm__ ( __asm__ (
"mov %%rbx,%%rdi;" "pushq %%rbx;"
"cpuid;" "cpuid;"
"movl %%ebx,%1;" "movl %%ebx,%1;"
"mov %%rdi,%%rbx;" "popq %%rbx;"
: "=a" (*eax), : "=a" (*eax),
"=r" (*ebx), "=S" (*ebx),
"=c" (*ecx), "=c" (*ecx),
"=d" (*edx) "=d" (*edx)
: "a" (*eax) : "a" (*eax)
: "rdi", "rbx"
); );
#else #else
__asm__( __asm__ (
"movl %%ebx,%%edi;" "pushl %%ebx;"
"cpuid;" "cpuid;"
"movl %%ebx,%1;" "movl %%ebx,%1;"
"movl %%edi,%%ebx;" "popl %%ebx;"
: "=a" (*eax), : "=a" (*eax),
"=r" (*ebx), "=S" (*ebx),
"=c" (*ecx), "=c" (*ecx),
"=d" (*edx) "=d" (*edx)
: "a" (*eax) : "a" (*eax)
: "edi", "ebx"
); );
#endif #endif
} }