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[Bug tree-optimization/18298] [4.0 Regression] bad code from lim ssa pass with strcmp
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Nov 2004 20:25:08 -0000
- Subject: [Bug tree-optimization/18298] [4.0 Regression] bad code from lim ssa pass with strcmp
- References: <20041104155905.18298.snyder@fnal.gov>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-04 20:25 -------
Adding a may_alias pass after fold all builtins makes this testcase works (I don't know if this is correct
fix or not):
Index: tree-optimize.c
===============================================================
====
RCS file: /cvs/gcc/gcc/gcc/tree-optimize.c,v
retrieving revision 2.61
diff -u -p -r2.61 tree-optimize.c
--- tree-optimize.c 2 Nov 2004 00:23:04 -0000 2.61
+++ tree-optimize.c 4 Nov 2004 20:23:32 -0000
@@ -371,6 +371,7 @@ init_tree_optimization_passes (void)
NEXT_PASS (pass_ccp);
NEXT_PASS (pass_redundant_phi);
NEXT_PASS (pass_fold_builtins);
+ NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_split_crit_edges);
NEXT_PASS (pass_pre);
NEXT_PASS (pass_loop);
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18298