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combiner fix, PR45966

From: Bernd Schmidt <bernds at codesourcery dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: marcus dot shawcroft at arm dot com
Date: Mon, 11 Oct 2010 21:45:59 +0200
Subject: combiner fix, PR45966

The combine-4 patch caused PR45966.  We have a 4->2 combination, and i0
feeds i1 which feeds i2.  When substituting, we only check i0_feeds_i2
and i1_feeds_i2; we also need to check the i0_feeds_i1/i1_feeds_i2 chain
and substitute accordingly.

Bootstrapped and regression tested on i686-linux; ok?


Bernd

Attachment: c4-fix.diff
Description: Text document

Follow-Ups:
- Re: combiner fix, PR45966
  - From: Richard Guenther
- Re: combiner fix, PR45966
  - From: H.J. Lu

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