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Date: Thu, 13 Mar 2003 00:46:00 -0000
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Cc: gcc-prs@gcc.gnu.org,
From: Richard Henderson <rth@redhat.com>
Subject: Re: optimization/8178: __builtin_ffs broken
Reply-To: Richard Henderson <rth@redhat.com>
X-SW-Source: 2003-03/txt/msg00751.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR optimization/8178; it has been noted by GNATS.

From: Richard Henderson <rth@redhat.com>
To: Volker Reichelt <reichelt@igpm.rwth-aachen.de>
Cc: christianbiere@gmx.de, gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
   falk.hueffner@student.uni-tuebingen.de, ebotcazou@libertysurf.fr,
   gcc-patches@gcc.gnu.org
Subject: Re: optimization/8178: __builtin_ffs broken
Date: Wed, 12 Mar 2003 16:42:15 -0800

 On Wed, Mar 12, 2003 at 01:30:29PM +0100, Volker Reichelt wrote:
 > I can confirm that the problem is still present on k6.
 > According to Phil's tester the problem for the ix86 was fixed
 > between 2003-01-31 and 2003-02-01.
 
 Backporting the patch you mention isn't an option, but
 this bug is fixable for 3.2/3.3 trivially.
 
 
 r~
 
 
 	* config/i386/i386.md (ffssi2): Tighten op1 predicate to 
 	match the requirements of the output insns.
 
 Index: gcc/config/i386/i386.md
 ===================================================================
 RCS file: /cvs/gcc/gcc/gcc/config/i386/i386.md,v
 retrieving revision 1.404.2.10
 diff -c -p -d -u -r1.404.2.10 i386.md
 --- gcc/config/i386/i386.md	12 Mar 2003 09:35:27 -0000	1.404.2.10
 +++ gcc/config/i386/i386.md	13 Mar 2003 00:41:08 -0000
 @@ -13671,7 +13671,7 @@
  
  (define_expand "ffssi2"
    [(set (match_operand:SI 0 "nonimmediate_operand" "") 
 -	(ffs:SI (match_operand:SI 1 "general_operand" "")))]
 +	(ffs:SI (match_operand:SI 1 "nonimmediate_operand" "")))]
    ""
  {
    rtx out = gen_reg_rtx (SImode), tmp = gen_reg_rtx (SImode);