[Bug tree-optimization/91178] [9/10 Regression] Infinite recursion in split_constant_offset in slp after r260289

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91178

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Jul 17 10:26:25 2019
New Revision: 273549

URL: https://gcc.gnu.org/viewcvs?rev=273549&root=gcc&view=rev
Log:
2019-07-17  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/91178
        * tree-vect-stmts.c (get_group_load_store_type): For SLP
        loads with a gap larger than the vector size always use
        VMAT_STRIDED_SLP.
        (vectorizable_load): For VMAT_STRIDED_SLP with a permutation
        avoid loading vectors that are only contained in the gap
        and thus are not needed.

        * gcc.dg/torture/pr91178.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr91178.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-stmts.c