https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77756
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Uroš Bizjak from comment #9)
> 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--
It looks good to me.
