[Bug tree-optimization/78205] BB vectorization confused by too large load groups

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78205

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Nov  8 08:06:42 2016
New Revision: 241956

URL: https://gcc.gnu.org/viewcvs?rev=241956&root=gcc&view=rev
Log:
2016-11-08  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/78205
        * tree-vect-stmts.c (vectorizable_load): Move check whether
        we may run into gaps when BB vectorizing SLP permutations ...
        * tree-vect-slp.c (vect_supported_load_permutation_p): ...
        here where we can do a more precise check.

        * gcc.dg/vect/bb-slp-pr78205.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/bb-slp-pr78205.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-slp.c
    trunk/gcc/tree-vect-stmts.c