[Bug tree-optimization/52631] [4.6/4.7/4.8 Regression] VN does not use simplified expression for lookup

[law at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52631

--- Comment #10 from Jeffrey A. Law <law at gcc dot gnu.org> 2013-01-20 05:01:04 UTC ---
Author: law
Date: Sun Jan 20 05:00:56 2013
New Revision: 195318

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195318
Log:
        PR tree-optimization/52631
        * tree-ssa-sccvn (visit_use): Before looking up the original
        statement, try looking up the simplified expression.

        PR tree-optimization/52631
        * tree-ssa/pr52631.c: New test.
        * tree-ssa/ssa-fre-9: Update expected output.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr52631.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-9.c
    trunk/gcc/tree-ssa-sccvn.c