[Bug tree-optimization/54579] missed optimization: ASR idiom

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54579

--- Comment #2 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
Author: miyuki
Date: Tue May 17 20:50:22 2016
New Revision: 236344

URL: https://gcc.gnu.org/viewcvs?rev=236344&root=gcc&view=rev
Log:
Fold bit_not through ASR and rotate

gcc/

        PR tree-optimization/54579
        PR middle-end/55299
        * match.pd (~(~X >> Y), ~(~X >>r Y), ~(~X <<r Y)): New patterns.

gcc/testsuite

        PR tree-optimization/54579
        PR middle-end/55299
        * gcc.dg/fold-notrotate-1.c: New test.
        * gcc.dg/fold-notshift-1.c: New test.
        * gcc.dg/fold-notshift-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/fold-notrotate-1.c
    trunk/gcc/testsuite/gcc.dg/fold-notshift-1.c
    trunk/gcc/testsuite/gcc.dg/fold-notshift-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog