[Bug tree-optimization/66299] more optimize opportunity

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66299

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Jun  9 14:24:04 2015
New Revision: 224283

URL: https://gcc.gnu.org/viewcvs?rev=224283&root=gcc&view=rev
Log:
        PR tree-optimization/66299
        * match.pd ((CST1 << A) == CST2 -> A == ctz (CST2) - ctz (CST1)
        ((CST1 << A) != CST2 -> A != ctz (CST2) - ctz (CST1)): New
        patterns.

        * gcc.dg/pr66299-1.c: New test.
        * gcc.dg/pr66299-2.c: New test.
        * gcc.dg/pr66299-3.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr66299-1.c
    trunk/gcc/testsuite/gcc.dg/pr66299-2.c
    trunk/gcc/testsuite/gcc.dg/pr66299-3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog