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int
main()
{
unsigned int _eax,_ebx,_ecx,_edx;
unsigned int level = 0;
/* Test gcc inline asm for x86. Note that we CANNOT plainly use __x86_64__
* to correspond to a 64-bit environment without also checking that __ILP32__
* is NOT set, since x32 uses __x86_64__.
*/
#if (defined(__x86_64__) && !defined(__ILP32__))
__asm__("push %%rbx \n\t"
"cpuid \n\t"
"movl %%ebx, %1 \n\t"
"pop %%rbx \n\t"
: "=a"(_eax), "=r"(_ebx), "=c"(_ecx), "=d"(_edx) : "0"(level));
#elif (defined(__x86_64__) && defined(__ILP32__)) || defined(__i386__)
__asm__("push %%ebx \n\t"
"cpuid \n\t"
"movl %%ebx, %1 \n\t"
"pop %%ebx \n\t"
: "=a"(_eax), "=r"(_ebx), "=c"(_ecx), "=d"(_edx) : "0"(level));
#else
# error Cannot detect whether this is a 32-bit or 64-bit x86 build.
#endif
return 0;
}
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