[Bug tree-optimization/57521] [4.7 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 #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Mar 18 08:46:21 2014
New Revision: 208632

URL: http://gcc.gnu.org/viewcvs?rev=208632&root=gcc&view=rev
Log:
2014-03-18  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.

    2013-09-03  Richard Biener  <rguenther@suse.de>

    PR middle-end/57656
    * fold-const.c (negate_expr_p): Fix division case.
    (negate_expr): Likewise.

    * gcc.dg/torture/pr57656.c: New testcase.

    2013-11-19  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/57517
    * tree-predcom.c (combinable_refs_p): Verify the combination
    is always executed when the refs are.

    * gfortran.fortran-torture/compile/pr57517.f90: New testcase.
    * gcc.dg/torture/pr57517.c: Likewise.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr57517.c
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr57521.c
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr57656.c
   
branches/gcc-4_7-branch/gcc/testsuite/gfortran.fortran-torture/compile/pr57517.f90
Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/fold-const.c
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_7-branch/gcc/tree-if-conv.c
    branches/gcc-4_7-branch/gcc/tree-predcom.c