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Subject: [Bug middle-end/45720] [4.6 regression] Revision 164367 miscompiled SPEC CPU 2K
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45720

--- Comment #2 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2010-10-03 05:41:44 UTC ---
Author: hjl
Date: Sun Oct  3 05:39:32 2010
New Revision: 164914

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164914
Log:
Disallow negative steps in vectorizer.

gcc/

2010-10-02  H.J. Lu  <hongjiu.lu@intel.com>

    PR tree-optimization/45720
    PR tree-optimization/45764
    * tree-vect-data-refs.c (vect_analyze_data_ref_access):
    Don't accept backwards consecutive accesses.
    (vect_create_data_ref_ptr): Disallow negative steps.

    * tree-vect-stmts.c (vectorizable_store): Allow negative steps.
    (perm_mask_for_reverse): Removed.
    (reverse_vec_elements): Likewise.
    (vectorizable_load): Don't hanle negative steps.

gcc/testsuite/

2010-10-02  H.J. Lu  <hongjiu.lu@intel.com>

    PR tree-optimization/45720
    PR tree-optimization/45764
    * g++.dg/torture/pr45764.C: New.

    * gcc.dg/vect/pr43432.c: Xfail.
    * gcc.dg/vect/vect-114.c: Likewise.
    * gcc.dg/vect/vect-15.c: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr45764.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/vect/pr43432.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-114.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-15.c
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-stmts.c

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-21 10:03:49 UTC ---
Likely a dup of PR45764 which has all the analysis.