[Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66423

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jun  9 12:31:43 2015
New Revision: 224279

URL: https://gcc.gnu.org/viewcvs?rev=224279&root=gcc&view=rev
Log:
2015-06-09  Richard Biener  <rguent...@suse.de>

        PR middle-end/66423
        * match.pd: Handle A % (unsigned)(1 << B).

        * gcc.dg/fold-modpow2.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/fold-modpow2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog