[Bug tree-optimization/78482] [7 Regression] wrong code at -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78482

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 23 14:25:48 2016
New Revision: 242754

URL: https://gcc.gnu.org/viewcvs?rev=242754&root=gcc&view=rev
Log:
2016-11-23  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/78482
        * tree-cfgcleanup.c: Include tree-ssa-loop-niter.h.
        (remove_forwarder_block_with_phi): When merging with a loop
        header creates a new latch reset number of iteration information
        of the loop.

        * gcc.dg/torture/pr78482.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr78482.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-cfgcleanup.c