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[PATCH, i386]: Extend TARGET_READ_MODIFY{,_WRITE} peepholes to all integer modes

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Eric Botcazou <ebotcazou at adacore dot com>
Date: Thu, 28 Apr 2016 21:16:40 +0200
Subject: [PATCH, i386]: Extend TARGET_READ_MODIFY{,_WRITE} peepholes to all integer modes
Authentication-results: sourceware.org; auth=none

Hello!

Attached patch extends TARGET_READ_MODIFY{,_WRITE} peepholes to handle
all integer modes, while also taking care not to introduce additional
QImode register stalls.

While looking at the insn enable condition, I noticed that we don't
use "probe_stack" pattern any more, as the stack check loop is now
implemented in a different way.

2016-04-28  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (peephole2s for operations with memory inputs):
    Use SWI mode iterator.
    (peephole2s for operations with memory outputs): Ditto.
    Do not check for stack checking probe.

    (probe_stack): Remove expander.

Patch was bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, i386]: Extend TARGET_READ_MODIFY{,_WRITE} peepholes to all integer modes
  - From: Eric Botcazou

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