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[patch] Simplify further in combine

From: Chung-Lin Tang <chunglin dot tang at gmail dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 17 Mar 2011 00:01:10 +0900
Subject: [patch] Simplify further in combine

Hi,
this patch adds slightly more simplification in try_combine(), under
-fexpensive-optimizations, by calling subst() to both i2 and i1.
Supplied is an ARM testcase where this resulted in one less redundant
ZERO_EXTEND insn under ARMv6 and above.

Bootstrapped and tested on i686 and x86_64, cross-tested on ARM-Linux
using QEMU, all with no regressions. Okay for trunk?

Thanks,
Chung-Lin

2011-03-16  Chung-Lin Tang  <cltang@codesourcery.com>

	* combine.c (try_combine): Do simplification only call of
	subst() on i2 even when i1 is present. Update comments.

	testsuite/
	* gcc.target/arm/unsigned-extend-1.c: New testcase.

Attachment: combine.diff
Description: Text document

Follow-Ups:
- Re: [patch] Simplify further in combine
  - From: Richard Henderson

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