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[PATCH, i386]: Avoid partial reg stall with arith insn + setCC + movzbl sequence

From: Uros Bizjak <ubizjak at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Mon, 12 Mar 2012 09:52:01 +0100
Subject: [PATCH, i386]: Avoid partial reg stall with arith insn + setCC + movzbl sequence

Hello!

Attached patch improves setCC + movzbl to xor + setcc peephole2 to
also handle CC setting arithmetic instructions.

2012-03-12  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/i386.md (setcc + movzbl to xor + setcc peephole2):
	Also convert sequences with CC setting arithmetic instruction.

Tested on x86_64-pc-linux-gnu {, -m32}, committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, i386]: Avoid partial reg stall with arith insn + setCC + movzbl sequence
  - From: Paolo Bonzini

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