[Bug optimization/12340] [3.3 regression] loop unroller + gcse produces wrong code

[cvs-commit at gcc dot gnu dot org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12340



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-09-27 17:18 -------
Subject: Bug 12340

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	ebotcazou@gcc.gnu.org	2003-09-27 17:18:25

Modified files:
	gcc            : ChangeLog loop.h unroll.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/opt: unroll1.C 

Log message:
	PR optimization/12340
	* loop.h (struct induction): Document the new semantics
	of the 'same' field for bivs.
	* unroll.c (biv_total_increment): Don't count the same
	biv increment several times.
	(loop_iterations) [GENERAL_INDUCT]: Likewise.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.1196&r2=2.1197
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/loop.h.diff?cvsroot=gcc&r1=1.68&r2=1.69
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/unroll.c.diff?cvsroot=gcc&r1=1.202&r2=1.203
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3082&r2=1.3083
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/opt/unroll1.C.diff?cvsroot=gcc&r1=NONE&r2=1.1