[Bug middle-end/58564] [4.7/4.8/4.9 Regression] possible wrong code bug at -O0

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58564

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Sep 30 20:15:20 2013
New Revision: 203042

URL: http://gcc.gnu.org/viewcvs?rev=203042&root=gcc&view=rev
Log:
    PR middle-end/58564
    * fold-const.c (fold_ternary_loc): For A < 0 : <sign bit of A> : 0
    optimization, punt if sign_bit_p looked through any zero extension.

    * gcc.c-torture/execute/pr58564.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr58564.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog