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

[yzhang1985 at gmail dot com]

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

--- Comment #12 from Yale Zhang <yzhang1985 at gmail dot com> ---
What's the purpose of subleaf? Is it to distinguish the capabilities of
different cores in a heterogeneous chip (e.g. ARM big-little)?

Then I would be fine with making this an extra parameter to __get_cpuid(). 

Microsoft has a __cpuidex() function that also takes subleaf, but for the
regular __cpuid(), the subleaf default to 0. Should __get_cpuid() default to 0
as well?


(In reply to uros from comment #11)
> Author: uros
> Date: Thu Sep 29 18:44:32 2016
> New Revision: 240629
> 
> URL: https://gcc.gnu.org/viewcvs?rev=240629&root=gcc&view=rev
> Log:
> 	PR target/77756
> 	* config/i386/cpuid.h (__get_cpuid_count): New.
> 	(__get_cpuid): Rename __level to __leaf.
> 
> testsuite/ChangeLog:
> 
> 	PR target/77756
> 	* gcc.target/i386/pr77756.c: New test.
> 
> 
> Modified:
>     trunk/gcc/ChangeLog
>     trunk/gcc/config/i386/cpuid.h
>     trunk/gcc/testsuite/ChangeLog
>     trunk/gcc/testsuite/gcc.target/i386/pr77756.c