* Uros Bizjak: > +#elif defined(__x86_64__) > +#define __cpuid(level, a, b, c, d) \ > + __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ > + "cpuid\n\t" \ > + "xchg{q}\t{%%}rbx, %q1\n\t" \ > + : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \ > + : "0" (level)) > + > +#define __cpuid_count(level, count, a, b, c, d) \ > + __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ > + "cpuid\n\t" \ > + "xchg{q}\t{%%}rbx, %q1\n\t" \ > + : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \ > + : "0" (level), "2" (count)) > +#endif
Shouldn't the constraint for b be "=&r"?