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Re: Why doesn't GCC generate conditional move for COND_EXPR?

From: Richard Guenther <richard dot guenther at gmail dot com>
To: Bingfeng Mei <bmei at broadcom dot com>
Cc: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Mon, 24 Oct 2011 16:00:50 +0200
Subject: Re: Why doesn't GCC generate conditional move for COND_EXPR?
References: <7FB04A5C213E9943A72EE127DB74F0ADD15FEADD80@SJEXCHCCR02.corp.ad.broadcom.com>

On Mon, Oct 24, 2011 at 2:55 PM, Bingfeng Mei <bmei@broadcom.com> wrote:
> Hello,
> I noticed that COND_EXPR is not expanded to conditional move
> as MIN_EXPR/MAX_EXPR are (assuming movmodecc is available).
> I wonder why not?
>
> I have some loop that fails tree vectorization, but still contains
> COND_EXPR from tree ifcvt pass. In the end, the generated code
> is worse than if I don't turned -ftree-vectorize on. ?This
> is on our private port.

Because nobody touched COND_EXPR expansion since ages.

> Thanks,
> Bingfeng Mei
>
>

Follow-Ups:
- Re: Why doesn't GCC generate conditional move for COND_EXPR?
  - From: Andrew Pinski

References:
- Why doesn't GCC generate conditional move for COND_EXPR?
  - From: Bingfeng Mei

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