The x86 cpuid instruction returns a processor ID and the __get_cpuid_max function even explicitly makes the %ebx value directly available. But users of that function have to use a cryptic constant. How about adding a few macros to make this more transparent?
Index: gcc/config/i386/cpuid.h =================================================================== --- gcc/config/i386/cpuid.h (revision 191084) +++ gcc/config/i386/cpuid.h (working copy) @@ -75,6 +75,16 @@ #define bit_RDSEED (1 << 18) #define bit_ADX (1 << 19) +/* Signatures for different CPU implementations as returned in uses + of cpuid with level 0. */ +#define signature_INTEL_ebx 0x756e6547 +#define signature_INTEL_ecx 0x6c65746e +#define signature_INTEL_edx 0x49656e69 + +#define signature_AMD_ebx 0x68747541 +#define signature_AMD_ecx 0x444d4163 +#define signature_AMD_edx 0x69746e65 + #if defined(__i386__) && defined(__PIC__) /* %ebx may be the PIC register. */ #if __GNUC__ >= 3
