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

[rguenth at gcc dot gnu.org]

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.9.0
            Summary|[4.7/4.8/4.9 Regression]    |[4.7/4.8 Regression] wrong
                   |wrong code for expressions  |code for expressions in
                   |in loop at -O3              |loop at -O3
      Known to fail|                            |4.8.1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Aug 27 10:10:34 2013
New Revision: 202019

URL: http://gcc.gnu.org/viewcvs?rev=202019&root=gcc&view=rev
Log:
2013-08-27  Richard Biener  <rguent...@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.
    (pass_data_if_conversion): Add TODO_verify_ssa.

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

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr57521.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-if-conv.c