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[Bug tree-optimization/71947] [6/7 Regression] x ^ y not folded to 0 if x == y by DOM
- From: "law at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 10 Oct 2016 20:41:31 +0000
- Subject: [Bug tree-optimization/71947] [6/7 Regression] x ^ y not folded to 0 if x == y by DOM
- Auto-submitted: auto-generated
- References: <bug-71947-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71947
--- Comment #12 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Oct 10 20:40:59 2016
New Revision: 240947
URL: https://gcc.gnu.org/viewcvs?rev=240947&root=gcc&view=rev
Log:
PR tree-optimization/71947
* tree-ssa-dom.c (cprop_into_stmt): Avoid replacing A with B, then
B with A within a single statement.
PR tree-optimization/71947
* gcc.dg/tree-ssa/pr71947-1.c: New test.
* gcc.dg/tree-ssa/pr71947-2.c: New test.
* gcc.dg/tree-ssa/pr71947-3.c: New test.
* gcc.dg/tree-ssa/pr71947-4.c: New test.
* gcc.dg/tree-ssa/pr71947-5.c: New test.
* gcc.dg/tree-ssa/pr71947-6.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-2.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-3.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-4.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-5.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-6.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-dom.c