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Re: more tidying of x86 feature tests


On 3/7/07, H. J. Lu <hjl@lucon.org> wrote:

> >So I guess the conditional above can be enabled iff we are 64bit and
> >arch is specified as "x86-64" or "nocona"
>
> Attached patch implements this proposal.
>
> 2007-03-07  Uros Bizjak  <ubizjak@gmail.com>
>
>        * config/i386/i386.c (ix86_tune_features) [X86_TUNE_SAHF]:
>       Also enable for m_K8 and m_AMDFAM10.
>       (override_options): Do not unconditionally disable
>       TARGET_USE_SAHF for 64-bit.
>       * config/i386/i386.md (x86_sahf_1): Do not disable for
>       TARGET_64BIT.
>
> Patch was tested on i686-pc-linux-gnu. If there are no objections,
> I'll commit this patch to SVN shortly.
>

Will -mtune=k8 use lahf with this patch?

Uh, yes. I missed one spot in ix86_emit_fp_unordered_jump(). I'll correct the patch.

BTW: Does CORE2 also prefer sahf?

uros.


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