[Bug tree-optimization/55964] [4.7/4.8 Regression] Segmentation fault with -O -ftree-loop-distribution -funswitch-loops

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55964

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-16 14:07:03 UTC ---
Author: rguenth
Date: Wed Jan 16 14:06:58 2013
New Revision: 195239

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195239
Log:
2013-01-16  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/55964
    * tree-flow.h (rename_variables_in_loop): Remove.
    (rename_variables_in_bb): Likewise.
    * tree-loop-distribution.c (update_phis_for_loop_copy): Remove.
    (copy_loop_before): Adjust and delete update-ssa status.
    * tree-vect-loop-manip.c (rename_variables_in_bb): Make static.
    (rename_variables_in_bb): Likewise.  Properly walk over
    predecessors.
    (rename_variables_in_loop): Remove.
    (slpeel_update_phis_for_duplicate_loop): Likewise.
    (slpeel_tree_duplicate_loop_to_edge_cfg): Handle nested loops,
    use available cfg machinery instead of duplicating it.
    Update PHI nodes and perform poor-mans SSA update here.
    (slpeel_tree_peel_loop_to_edge): Adjust.

    * gcc.dg/torture/pr55964.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr55964.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-flow.h
    trunk/gcc/tree-loop-distribution.c
    trunk/gcc/tree-vect-loop-manip.c