[Bug rtl-optimization/56151] [4.8 Regression] Performance degradation after r194054 on x86 Atom.

[jakub at gcc dot gnu.org]

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