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Re: [PATCH] Enhance shrink-wrap
- From: Steven Bosscher <stevenb dot gcc at gmail dot com>
- To: Zhenqiang Chen <zhenqiang dot chen at linaro dot org>
- Cc: gcc-patches at gcc dot gnu dot org, Martin Jambor <mjambor at suse dot cz>
- Date: Thu, 6 Jun 2013 14:43:49 +0200
- Subject: Re: [PATCH] Enhance shrink-wrap
- References: <CACgzC7Dyrc4Zc=WDKy=m03Wwp3hmrgD315b5vRuV9_gO_4MA-A at mail dot gmail dot com>
On Thu, Jun 6, 2013 at 11:55 AM, Zhenqiang Chen wrote:
> The patch enhance prepare_shrink_wrap by doing copyprop for the entry
> block. This exposes more opportunities for shrink-wrapping. These
> kinds of copies often occur when incoming argument registers are moved
> to call-saved registers because their values are live across one or
> more calls during the function.
Hello,
This was discussed before, see the thread surrounding:
http://gcc.gnu.org/ml/gcc-patches/2013-04/msg01455.html
This is also http://gcc.gnu.org/PR10474
Ciao!
Steven