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Re: [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Jing Yu <jingyu at google dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Fri, 15 Jan 2010 09:38:56 +0100
Subject: Re: [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG
References: <85670fb81001131632j106a8257t3968274ae2b32187@mail.gmail.com> <201001141256.50276.ebotcazou@adacore.com> <85670fb81001142037v5e8d9fa5ge4fb02abd952adb2@mail.gmail.com>

> 2010-01-14  Jing Yu  <jingyu@google.com>
>
>         PR rtl-optimization/42691
>         * combine.c (try_combine): Clear outdated i3note when dest of I3 is
>         replaced.
>
> testsuite/ChangeLog
> 2010-01-14  Jing Yu  <jingyu@google.com>
>
> 	* gcc.c-torture/execute/pr42691.c: New.

OK for mainline and 4.4 branch with the following ChangeLog:

	PR rtl-optimization/42691
	* combine.c (try_combine): Set changed_i3_dest to 1 when I2 and I3 set
	a pseudo to a constant and are merged, and adjust comments.


-- 
Eric Botcazou

Follow-Ups:
- Re: [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG
  - From: Jing Yu

References:
- [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG
  - From: Jing Yu
- Re: [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG
  - From: Eric Botcazou
- Re: [Patch]PR rtl-optimization/42691: problematic REG_EQUAL note added to SUBREG
  - From: Jing Yu

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