[Bug inline-asm/78487] asm cpuid code and -fgcse crashes

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78487

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
What is the error message which you are getting?  

Here is how GCC's cpuid.h header look like for cpuid:

#define __cpuid(level, a, b, c, d)                      \
  __asm__ ("cpuid\n\t"                                  \
           : "=a" (a), "=b" (b), "=c" (c), "=d" (d)     \
           : "0" (level))

#define __cpuid_count(level, count, a, b, c, d)         \
  __asm__ ("cpuid\n\t"                                  \
           : "=a" (a), "=b" (b), "=c" (c), "=d" (d)     \
           : "0" (level), "2" (count))


It does not use r but rather b directly.