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Re: [PATCH PR72772]Also check equality for expanded iv base.

From: Jeff Law <law at redhat dot com>
To: Bin Cheng <Bin dot Cheng at arm dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: nd <nd at arm dot com>
Date: Wed, 3 Aug 2016 16:18:49 -0600
Subject: Re: [PATCH PR72772]Also check equality for expanded iv base.
Authentication-results: sourceware.org; auth=none
References: <VI1PR0802MB2176B860C94CE7985DA4E913E7060@VI1PR0802MB2176.eurprd08.prod.outlook.com>

On 08/03/2016 10:35 AM, Bin Cheng wrote:

Hi,
Following previous patch, this one fixes PR72772 by checking equality for expanded iv base.  Richard is fixing the PR by removing degenerate PHI at the first place, but I think this one also catches more cases.
Bootstrap and test on x86_64 and AArch64.  Is it OK?

Thanks,
bin

2016-08-02  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/72772
	* tree-ssa-loop-niter.c (loop_exits_before_overflow): Check equality
	for expanded base.

gcc/testsuite/ChangeLog
2016-08-02  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/pr72772
	* gcc.dg/tree-ssa/pr72772.c: New test.

OK.
jeff

References:
- [PATCH PR72772]Also check equality for expanded iv base.
  - From: Bin Cheng

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