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Re: [PATCH] x86: Define _mm*_undefined_*
- From: Ulrich Drepper <drepper at gmail dot com>
- To: Ilya Tocar <tocarip dot intel at gmail dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Mon, 17 Mar 2014 22:27:36 -0400
- Subject: Re: [PATCH] x86: Define _mm*_undefined_*
- Authentication-results: sourceware.org; auth=none
- References: <87bnx6z9at dot fsf at x240 dot local dot i-did-not-set--mail-host-address--so-tickle-me> <20140317113921 dot GA71172 at msticlxl7 dot ims dot intel dot com>
On Mon, Mar 17, 2014 at 7:39 AM, Ilya Tocar <tocarip.intel@gmail.com> wrote:
> Do you know of any cases where xor is
> generated (except for destination in gather/scatter)
I don't have any code exhibiting this handy right now. I'll keep an eye out.
> but it also clobbers
> flags. Maybe just define it to setzero for now?
What do you mean by "clobbers flags"? Do you have an example?