[Bug tree-optimization/79578] Unnecessary instructions in generated code

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79578

--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Feb 23 05:47:43 2017
New Revision: 245675

URL: https://gcc.gnu.org/viewcvs?rev=245675&root=gcc&view=rev
Log:
        PR tree-optimization/79578
        * tree-ssa-dse.c (clear_bytes_written_by): Use operand_equal_p
        to compare base operands.

        PR tree-optimization/79578
        * g++.dg/tree-ssa/ssa-dse-3.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/ssa-dse-3.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dse.c