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Re: [Patch, i386] Support AES, F16C, BMI and BMI2 targets in multiversioning
- From: Jakub Jelinek <jakub at redhat dot com>
- To: Allan Sandfeld Jensen <linux at carewolf dot com>
- Cc: gcc-patches at gcc dot gnu dot org, "H.J. Lu" <hjl dot tools at gmail dot com>
- Date: Wed, 31 Dec 2014 14:15:42 +0100
- Subject: Re: [Patch, i386] Support AES, F16C, BMI and BMI2 targets in multiversioning
- Authentication-results: sourceware.org; auth=none
- References: <201412311328 dot 48412 dot linux at carewolf dot com>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Wed, Dec 31, 2014 at 01:28:47PM +0100, Allan Sandfeld Jensen wrote:
> I recently wanted to use multiversioning for BMI2 specific extensions
> PDEP/PEXT, and noticed it wasn't there. So I wrote this patch to add it, and
> also added AES, F16C and BMI1 for completeness.
AES nor F16C doesn't make any sense IMHO for multiversioning, you need
special intrinsics for that anyway and when you use them, the function will
fail to compile without those features.
Multiversioning only makes sense for ISA features the compiler uses for
normal C/C++ code without any intrinsics.
Jakub