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Date: Sat, 17 Nov 2001 00:16:00 -0000
Message-ID: <20011122005601.24475.qmail@sourceware.cygnus.com>
To: nobody@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org,
From: Ian Lance Taylor <ian@airs.com>
Subject: Re: c/4925: __builtin_memcpy overcopies on ix86 in gcc 3.0.2
Reply-To: Ian Lance Taylor <ian@airs.com>
X-SW-Source: 2001-11/txt/msg00443.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR c/4925; it has been noted by GNATS.

From: Ian Lance Taylor <ian@airs.com>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c/4925: __builtin_memcpy overcopies on ix86 in gcc 3.0.2
Date: 21 Nov 2001 16:46:38 -0800

 gcc-gnats@gcc.gnu.org writes:
 
 > Thank you very much for your problem report.
 > It has the internal identification `c/4925'.
 > The individual assigned to look at your
 > report is: unassigned. 
 > 
 > >Category:       c
 > >Responsible:    unassigned
 > >Synopsis:       __builtin_memcpy overcopies on ix86 in gcc 3.0.2
 > >Arrival-Date:   Wed Nov 21 16:26:00 PST 2001
 
 I believe this is the patch which fixes the bug.  A version of this
 patch appears in the current development sources.
 
 Ian
 
 Index: i386.md
 ===================================================================
 RCS file: /home/cvsfiles/tools/egcs/gcc/config/i386/i386.md,v
 retrieving revision 1.1.1.4
 diff -u -r1.1.1.4 i386.md
 --- i386.md	2001/11/14 22:28:55	1.1.1.4
 +++ i386.md	2001/11/22 00:46:27
 @@ -10917,7 +10917,7 @@
  	  LABEL_NUSES (label) = 1;
  	}
        if (align > 1 && count > 0 && (count & 1))
 -	emit_insn (gen_strmovsi (destreg, srcreg));
 +	emit_insn (gen_strmovqi (destreg, srcreg));
        if (align <= 1 || count < 0)
  	{
  	  rtx label = gen_label_rtx ();