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[PATCH, ARM] More strictly validate LDRD/STRD peepholes

From: Richard Earnshaw <rearnsha at arm dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 09 Dec 2013 14:58:15 +0000
Subject: [PATCH, ARM] More strictly validate LDRD/STRD peepholes
Authentication-results: sourceware.org; auth=none

This patch fixes a bug on ARM where we can end up generating invalid
addresses for the LDRD/STRD peepholes.  We then end up with an ICE later
on when we check the results.  The patch does more strict validation of
the addresses, including having better tests for side effects that we
can't handle.

Tested on arm-linux-gnueabi and applied to trunk.

R.

gcc/
	* arm.c (mem_ok_for_ldrd_strd): Rename first argument as MEM.
	Do more address validation checks.
gcc/testsuite/
	* gcc.target/arm/ldrd-strd-offset.c: New.

Attachment: ldrd-offset-final.patch
Description: Text document

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