[Bug tree-optimization/71625] missing strlen optimization on different array initialization style

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71625

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jun 29 08:47:46 2016
New Revision: 237841

URL: https://gcc.gnu.org/viewcvs?rev=237841&root=gcc&view=rev
Log:
        PR tree-optimization/71625
        * tree-ssa-strlen.c (get_addr_stridx): Add PTR argument.  Assume list
        is sorted by ascending list->offset.  If PTR is non-NULL and there is
        previous strinfo, call get_stridx_plus_constant.
        (get_stridx): Pass exp as second argument to get_addr_stridx.
        (addr_stridxptr): Add missing list = list->next, so that there can be
        more than one entries in the list.  Bump limit from 16 to 32.  Ensure
        the list is sorted by ascending list->offset.
        (get_stridx_plus_constant): Adjust so that it can be also called with
        ADDR_EXPR instead of SSA_NAME as PTR.
        (handle_char_store): Pass NULL_TREE as second argument to
        get_addr_stridx.

        * gcc.dg/strlenopt-28.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/strlenopt-28.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c