[Bug tree-optimization/78899] [7 Regression] Vestorized loop with optmized mask stores motion is completely deleted after r242520.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78899

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jan  9 20:10:23 2017
New Revision: 244238

URL: https://gcc.gnu.org/viewcvs?rev=244238&root=gcc&view=rev
Log:
        PR tree-optimization/78899
        * tree-if-conv.c (version_loop_for_if_conversion): Instead of
        returning bool return struct loop *, NULL for failure and the new
        loop on success.
        (versionable_outer_loop_p): Don't version outer loop if it has
        dont_vectorized bit set.
        (tree_if_conversion): When versioning outer loop, ensure
        tree_if_conversion is performed also on the inner loop of the
        non-vectorizable outer loop copy.
        * tree-vectorizer.c (set_uid_loop_bbs): Formatting fix.  Fold
        LOOP_VECTORIZED in inner loop of the scalar outer loop and
        prevent vectorization of it.
        (vectorize_loops): For outer + inner LOOP_VECTORIZED, ensure
        the outer loop vectorization of the non-scalar version is attempted
        before vectorization of the inner loop in scalar version.  If
        outer LOOP_VECTORIZED guarded loop is not vectorized, prevent
        vectorization of its inner loop.
        * tree-vect-loop-manip.c (rename_variables_in_bb): If outer_loop
        has 2 inner loops, rename also on edges from bb whose single pred
        is outer_loop->header.  Fix typo in function comment.

        * gcc.target/i386/pr78899.c: New test.
        * gcc.dg/pr71077.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr71077.c
    trunk/gcc/testsuite/gcc.target/i386/pr78899.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-if-conv.c
    trunk/gcc/tree-vect-loop-manip.c
    trunk/gcc/tree-vectorizer.c