[Bug middle-end/61158] negative shift at fold-const.c:12095

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61158

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 15 10:01:11 2014
New Revision: 210467

URL: http://gcc.gnu.org/viewcvs?rev=210467&root=gcc&view=rev
Log:
    PR tree-optimization/61158
    * fold-const.c (fold_binary_loc): If X is zero-extended and
    shiftc >= prec, make sure zerobits is all ones instead of
    invoking undefined behavior.

    * gcc.dg/pr61158.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr61158.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog