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[PATCH]: Fix PR rtl-optimization/31344

From: "Uros Bizjak" <ubizjak at gmail dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Cc: "François-Xavier Coudert" <fxcoudert at gmail dot com>
Date: Mon, 7 May 2007 12:09:36 +0200
Subject: [PATCH]: Fix PR rtl-optimization/31344

Hello!

This problem is the cause of i386 bootstrap failure with dfp.

The core of the problem is in memory_address(), where we force
autoincremented/autodecremented reference register into pseudo. This
causes invalid instruction:

(set (reg/f:SI 61)
       (pre_dec:SI (reg/f:SI 7 sp))) -1 (nil)
   (nil))

The solution is to skip processing of autoinc/dec references in a memory rtx.

Attached patch fixes the failure. The patch was bootstrapped on
i686-pc-linux-gnu and regression tested with -mtune=i386. OK for
mainline?

2007-05-07 Uros Bizjak <ubizjak@gmail.com>

	PR rtl-optimization/31344
       * explow.c (memory_address): Do not force autoincremented or
	autodecremented address references into pseudo register.

testsuite/ChangeLog:

2007-05-07 Uros Bizjak <ubizjak@gmail.com>

	PR rtl-optimization/31344
       * gcc.dg/pr31344.c: New test.

Uros.

Attachment: pr31344.diff
Description: Binary data

Follow-Ups:
- Re: [PATCH]: Fix PR rtl-optimization/31344
  - From: Ian Lance Taylor

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