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Re: Surprisingly bad code generated near char*

From: Andrew Haley <aph at redhat dot com>
To: Avi Kivity <avi at scylladb dot com>, Manuel López-Ibáñez <lopezibanez at gmail dot com>, GCC-help <gcc-help at gcc dot gnu dot org>
Date: Fri, 19 Aug 2016 08:32:04 +0100
Subject: Re: Surprisingly bad code generated near char*
Authentication-results: sourceware.org; auth=none
References: <b315835f-6899-1ccd-13e5-418cdadd494c@scylladb.com> <197568f8-8ca0-d1c8-5b0b-a7747d31d899@gmail.com> <9d93d68d-581f-2d88-14f7-b4ba7fc46057@scylladb.com> <5e12e7d0-94dc-34ef-4f67-833cae018217@redhat.com> <d64fe7e8-3026-768f-6ddc-cb78010df15f@scylladb.com>

On 18/08/16 19:54, Avi Kivity wrote:
> I replicated it on Fedora 24's gcc; in fact -O2 code is worse (but -O3 
> is fine):

So -O3 is fine; O2 isn't doing the analysis to merge the stores.  No bug.

Andrew.

Follow-Ups:
- Re: Surprisingly bad code generated near char*
  - From: Avi Kivity

References:
- Surprisingly bad code generated near char*
  - From: Avi Kivity
- Re: Surprisingly bad code generated near char*
  - From: Manuel López-Ibáñez
- Re: Surprisingly bad code generated near char*
  - From: Avi Kivity
- Re: Surprisingly bad code generated near char*
  - From: Andrew Haley
- Re: Surprisingly bad code generated near char*
  - From: Avi Kivity

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