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[Bug tree-optimization/68465] pass_lim doesn't detect identical loop entry conditions
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 23 Nov 2015 15:22:04 +0000
- Subject: [Bug tree-optimization/68465] pass_lim doesn't detect identical loop entry conditions
- Auto-submitted: auto-generated
- References: <bug-68465-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68465
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Nov 23 15:21:32 2015
New Revision: 230764
URL: https://gcc.gnu.org/viewcvs?rev=230764&root=gcc&view=rev
Log:
2015-11-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/68465
* tree-ssa-sccvn.c (sccvn_dom_walker::before_dom_children):
Also record equalities from multiple predecessor blocks if
only one non-backedge exists.
* gcc.dg/tree-ssa/ssa-fre-52.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-52.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-sccvn.c