[Bug middle-end/87290] Optimize signed x % pow2p == cst

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87290

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Sep 13 07:42:55 2018
New Revision: 264261

URL: https://gcc.gnu.org/viewcvs?rev=264261&root=gcc&view=rev
Log:
        PR middle-end/87290
        * expr.c (maybe_optimize_pow2p_mod_cmp): New function.
        (maybe_optimize_mod_cmp): Use it if integer_pow2p treeop1.

        * gcc.target/i386/pr87290.c: New test.
        * gcc.c-torture/execute/pr87290.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr87290.c
    trunk/gcc/testsuite/gcc.target/i386/pr87290.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/testsuite/ChangeLog