[Bug tree-optimization/60766] [4.7/4.8/4.9 Regression] Wrong optimization with -O2

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60766

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr  7 14:03:55 2014
New Revision: 209190

URL: http://gcc.gnu.org/viewcvs?rev=209190&root=gcc&view=rev
Log:
2014-04-07  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/60766
    * tree-ssa-loop-ivopts.c (cand_value_at): Compute in an
    unsigned type.
    (may_eliminate_iv): Convert cand_value_at result to desired
    type.

    * gcc.dg/torture/pr60766.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr60766.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-ivopts.c