[Bug tree-optimization/57521] [4.7/4.8 Regression] wrong code for expressions in loop at -O3

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57521

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Sep  9 09:51:18 2013
New Revision: 202388

URL: http://gcc.gnu.org/viewcvs?rev=202388&root=gcc&view=rev
Log:
2013-09-09  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2013-08-27  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/57521
    * tree-if-conv.c (if_convertible_bb_p): Verify that at least
    one edge is non-critical.
    (find_phi_replacement_condition): Make sure to use a non-critical
    edge.  Cleanup and remove old bug workarounds.
    (bb_postdominates_preds): Remove.
    (if_convertible_loop_p_1): Do not compute post-dominators.
    (combine_blocks): Do not free post-dominators.
    (main_tree_if_conversion): Likewise.

    * gcc.dg/torture/pr57521.c: New testcase.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr57521.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/tree-if-conv.c