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[PATCH] Fix PR60896

From: Cong Hou <congh at google dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: Richard Biener <rguenther at suse dot de>
Date: Wed, 23 Apr 2014 16:02:00 -0700
Subject: [PATCH] Fix PR60896
Authentication-results: sourceware.org; auth=none

See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60896 for bug report.

The cause of PR60896 is that those statements in PATTERN_DEF_SEQ in
pre-recognized widen-mult pattern are not forwarded to later
recognized dot-product pattern.

Another issue is that the def types of statements in PATTERN_DEF_SEQ
are assigned with the def type of the pattern statement. This is
incorrect for reduction pattern statement, in which case all
statements in PATTERN_DEF_SEQ will all be vect_reduction_def, and none
of them will be vectorized later. The def type of statement in
PATTERN_DEF_SEQ should always be vect_internal_def.

The patch is attached. Bootstrapped and tested on a x86_64 machine.

OK for trunk?


thanks,
Cong

Attachment: patch-pr60896.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Fix PR60896
  - From: Richard Biener

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