Re: optimization/8178: __builtin_ffs broken

[Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>]

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

From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
To: reichelt@igpm.rwth-aachen.de
Cc: christianbiere@gmx.de, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: optimization/8178: __builtin_ffs broken
Date: 18 Apr 2003 18:23:15 +0200

 reichelt@igpm.rwth-aachen.de writes:
 
 > Synopsis: __builtin_ffs broken
 > 
 > State-Changed-From-To: analyzed->closed
 > State-Changed-By: reichelt
 > State-Changed-When: Fri Apr 18 15:36:52 2003
 > State-Changed-Why:
 >     Fixed in gcc 3.2 branch, 3.3 branch and mainline.
 
 It still doesn't work for me on mainline with -march=k6:
 
 % cat ffs.c
 int f(int x) { return __builtin_ffs(x); }
 
 % /tmp/bla/bin/gcc -v 
 Reading specs from /usr/tmp/bla/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.4/specs
 Configured with: ./configure --enable-languages=c --disable-nls
 Thread model: posix
 gcc version 3.4 20030415 (experimental)
 % /tmp/bla/bin/gcc -c ffs.c 
 % /tmp/bla/bin/gcc -c -march=k6 ffs.c
 ffs.c: In function `f':
 ffs.c:1: error: unrecognizable insn:
 (insn 26 22 27 0 0x401705d8 (parallel [
             (set (reg:SI 1 edx)
                 (const_int 0 [0x0]))
             (clobber (reg:CC 17 flags))
         ]) -1 (nil)
     (nil))
 ffs.c:1: internal compiler error: in extract_insn, at recog.c:2188
 Please submit a full bug report,
 with preprocessed source if appropriate.
 See <URL:http://gcc.gnu.org/bugs.html> for instructions.
 
 -- 
 	Falk