[Bug tree-optimization/71289] Fails to optimize unsigned mul overflow check 'A > -1 / B'

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71289

--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Author: amonakov
Date: Mon May 30 14:37:02 2016
New Revision: 236882

URL: https://gcc.gnu.org/viewcvs?rev=236882&root=gcc&view=rev
Log:
match.pd: optimize unsigned mul overflow check

gcc/
2016-05-28  Alexander Monakov  <amona...@ispras.ru>
            Marc Glisse  <marc.gli...@inria.fr>

        PR tree-optimization/71289
        * match.pd (-1 / B < A, A > -1 / B): New transformations.

gcc/testsuite/
2016-05-28  Alexander Monakov  <amona...@ispras.ru>

        PR tree-optimization/71289
        * gcc.dg/pr71289.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/pr71289.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog