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[Bug rtl-optimization/56151] [4.8 Regression] Performance degradation after r194054 on x86 Atom.
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 12 Feb 2013 10:37:42 +0000
- Subject: [Bug rtl-optimization/56151] [4.8 Regression] Performance degradation after r194054 on x86 Atom.
- Auto-submitted: auto-generated
- References: <bug-56151-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56151
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-12 10:37:42 UTC ---
Author: jakub
Date: Tue Feb 12 10:37:38 2013
New Revision: 195972
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195972
Log:
PR rtl-optimization/56151
* optabs.c (add_equal_note): Don't return 0 if target is a MEM,
equal to op0 or op1, and last_insn pattern is CODE operation
with MEM dest and one of the operands matches that MEM.
* gcc.target/i386/pr56151.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr56151.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/optabs.c
trunk/gcc/testsuite/ChangeLog