On Sat, May 18, 2019 at 6:57 PM Segher Boessenkool
wrote:
> Something like
>
> *__ebx = *__ecx = *__edx = 0;
> asm volatile("" : "+r"(*__eax), "+r"(*__ebx), "+r"(*__ecx), "+r"(*__edx));
> __cpuid (__leaf, *__eax, *__ebx, *__ecx, *__edx);
>
> should do the trick.
Segher,
that got closer,
On Sat, May 18, 2019 at 5:30 PM Segher Boessenkool
wrote:
> That won't help, the compiler will remove those dead stores.
>
> Add a
>
> asm("" ::: "memory");
>
> between these two lines?
>
This didn't seem to do anything:
--- cpuid.h.orig 2019-05-14 05:52:11.0 -0400
+++ cpuid.h 2019-05
On Mon, May 13, 2019 at 4:49 PM Mike Gilbert wrote:
>
> Just a guess: I wonder if that 'auls' value is left over from the
> previous CPUID result. If that's the case, a simple solution might be
> to zero-out ebx, ecx, and edx in __cpuid().
Mike,
I tried your suggestion and added this patch to g
