[Bug c++/82084] [5/6/7/8 Regression] ICE: constructing wstring with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82084

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Sep  4 14:10:11 2017
New Revision: 251661

URL: https://gcc.gnu.org/viewcvs?rev=251661&root=gcc&view=rev
Log:
2017-09-04  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/82084
        * fold-const.h (can_native_encode_string_p): Declare.
        * fold-const.c (can_native_encode_string_p): Factor out from ...
        (native_encode_string): ... here.
        * tree-vect-stmts.c (vectorizable_store): Call it to avoid
        vectorizing stores from constants we later cannot handle.

        * g++.dg/torture/pr82084.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr82084.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/fold-const.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-stmts.c