On 03/16/2010 08:53 PM, H.J. Lu wrote:
> The question is what processor macros should "-march=x86-64" define. There
> is
>
> {"x86-64", PROCESSOR_K8, CPU_K8,
> PTA_64BIT | PTA_MMX | PTA_SSE | PTA_SSE2 | PTA_NO_SAHF},
>
> For -march=x86-64, __k8 is defined. However, real K8 supports:
>
> {"k8", PROCESSOR_K8, CPU_K8,
> PTA_64BIT | PTA_MMX | PTA_3DNOW | PTA_3DNOW_A | PTA_SSE
> | PTA_SSE2 | PTA_NO_SAHF},
>
> It isn't an issue in i386.c since PROCESSOR_K8 isn't used to check
> ISAs. But using __k8 to check ISAs is a problem.
>
I'm not sure to follow the gory details of your reply, but to me, it
seems *really* strange that *now*, on x86_64, "-m32" is not the same as
"-m32 -march=-i686" as far as __i686 is concerned...
Paolo.
