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Fix bootstrap error

From: Pat Haugen <pthaugen at us dot ibm dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 13 May 2010 16:10:17 -0500
Subject: Fix bootstrap error

Hit the following on PPC, when tree-ssa-loop-prefetch.c is compiled at -O1
(-O0 I would assume too).

/home/pthaugen/src/gcc/trunk/gcc/gcc/tree-ssa-loop-prefetch.c: In function
#prune_ref_by_group_reuse#:
/home/pthaugen/src/gcc/trunk/gcc/gcc/tree-ssa-loop-prefetch.c:720:27:
warning: comparison between signed and unsigned integer expressions
[-Wsign-compare]

Is the following correct and qualify as an obvious fix?  It fixes the
bootstrap issue.



2010-05-13  Pat Haugen  <pthaugen@us.ibm.com>

	* tree-ssa-loop.prefetch.c (prune_ref_by_group_reuse): Cast abs()
result to
	unsigned to prevent bootstrap error for signed and unsigned compare.

(See attached file: boot.diff)

Attachment: boot.diff
Description: Binary data

Follow-Ups:
- Re: Fix bootstrap error
  - From: Richard Guenther

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