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[RFC PATCH]Fix latent bug in combine pass as reported in pr62151

From: "Bin.Cheng" <amker dot cheng at gmail dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Mon, 18 Aug 2014 15:36:22 +0800
Subject: [RFC PATCH]Fix latent bug in combine pass as reported in pr62151
Authentication-results: sourceware.org; auth=none

Hi,
PR62151 is about wrong code generated on x86_641, which starts from
one of my checkin.  I did some investigation, now can confirm it's
another latent bug in combine pass as analyzed by comment#7 in the PR.
Here is a patch can fix the problem, as well as the code given in the
comment.  It passes bootstrap on x86_64, but the problem is code in
that part of combine is kind of ad-hoc implemented.  To be honest, I
don't fully understand it, so it would be better to have some combine
pass experts look into it and give some comments.

Thanks,
bin

Attachment: pr62151.txt
Description: Text document

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