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[PATCH] fixed pr59651 & new test case

From: Bingfeng Mei <bmei at broadcom dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: "tbelagod at arm dot com" <tbelagod at arm dot com>
Date: Thu, 2 Jan 2014 15:02:14 +0000
Subject: [PATCH] fixed pr59651 & new test case
Authentication-results: sourceware.org; auth=none

Hi, 
This patch fixes pr59651. The original regression for pr52943 only appears on AArch64 target. I constructed a similar test that also exposes bug on x86-64. The problem is that calculation of address range in alias versioning for loops with negative step is wrong during vectorization. For example, for a loop that access int a[3] -> a[1], the old calculated address range is [a, a+12). It should be [a+4, a+16) instead.

Bootstrapped and passed testsuite on x86-64. Get confirmed by original reporter that regression is fixed on AArch64. OK to commit?

Thanks,
Bingfeng

Attachment: patch_pr59651
Description: patch_pr59651

Follow-Ups:
- Re: [PATCH] fixed pr59651 & new test case
  - From: Richard Biener

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