[Bug tree-optimization/87287] Move signed (x % pow2) == 0 optimization to gimple

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87287

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Sep 13 07:36:50 2018
New Revision: 264260

URL: https://gcc.gnu.org/viewcvs?rev=264260&root=gcc&view=rev
Log:
        PR tree-optimization/87287
        * fold-const.c (fold_binary_loc) <case EQ_EXPR>: Move signed modulo
        X % C == 0 to X % (unsigned) C == 0 optimization to ...
        * match.pd (X % C == 0): ... here.  New optimization.

        * gcc.dg/tree-ssa/pr87287.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr87287.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog