[Bug target/77756] __get_cpuid() returns wrong values for level 7 (extended features)

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77756

--- Comment #9 from Uroš Bizjak <ubizjak at gmail dot com> ---
At the end of the day, it looks that we want simply an additional version of
__get_cpuid where sub-leaf can be specified - a variant of HJ's proposal:

--cut here--
/* Return cpuid data for requested cpuid leaf, as found in returned
   eax, ebx, ecx and edx registers.  The function checks if cpuid is
   supported and returns 1 for valid cpuid information or 0 for
   unsupported cpuid leaf.  All pointers are required to be non-null.  */

static __inline int
__get_cpuid (unsigned int __leaf,
             unsigned int *__eax, unsigned int *__ebx,
             unsigned int *__ecx, unsigned int *__edx)
{
  unsigned int __ext = __leaf & 0x80000000;

  if (__get_cpuid_max (__ext, 0) < __leaf)
    return 0;

  __cpuid (__leaf, *__eax, *__ebx, *__ecx, *__edx);
  return 1;
}

/* Same as above, but sub-leaf can be specified.  */

static __inline int
__get_cpuid_count (unsigned int __leaf, unsigned int __subleaf,
                   unsigned int *__eax, unsigned int *__ebx,
                   unsigned int *__ecx, unsigned int *__edx)
{
  unsigned int __ext = __leaf & 0x80000000;

  if (__get_cpuid_max (__ext, 0) < __leaf)
    return 0;

  __cpuid_count (__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
  return 1;
}
--cut here--