[Bug tree-optimization/78725] [7 Regression] wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78725

--- Comment #6 from Michael Matz <matz at gcc dot gnu.org> ---
Author: matz
Date: Tue Dec 13 14:14:41 2016
New Revision: 243606

URL: https://gcc.gnu.org/viewcvs?rev=243606&root=gcc&view=rev
Log:
Fix pr78725

        PR tree-optimization/78725
        * tree-ssa-loop-split.c (split_at_bb_p): Check for overflow and
        at correct use point.

testsuite/
        PR tree-optimization/78725
        * gcc.dg/pr78725.c: New test.
        * gcc.dg/pr78725-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr78725-2.c
    trunk/gcc/testsuite/gcc.dg/pr78725.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-split.c