[Bug tree-optimization/87985] Compile-time and memory hog w/ -O1 -ftree-slp-vectorize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87985

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 14 14:33:44 2018
New Revision: 266147

URL: https://gcc.gnu.org/viewcvs?rev=266147&root=gcc&view=rev
Log:
2018-11-14  Richard Biener  <rguenther@suse.de>

        PR middle-end/87985
        * tree-data-ref.c (split_constant_offset): Add wrapper
        allocating a cache hash-map.
        (split_constant_offset_1): Cache results of expanding
        expressions from SSA def stmts.

        * gcc.dg/pr87985.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr87985.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-data-ref.c