[Bug tree-optimization/83444] [5/6/7 Regression] missing strlen optimization on a member array of a local struct

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83444

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Dec 19 18:10:04 2017
New Revision: 255835

URL: https://gcc.gnu.org/viewcvs?rev=255835&root=gcc&view=rev
Log:
        PR tree-optimization/83444
        * tree-ssa-strlen.c (strlen_check_and_optimize_stmt): For the
        character load case, if get_stridx on MEM_REF's operand doesn't
        look usable, retry with get_addr_stridx.

        * gcc.dg/strlenopt-38.c: New test.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/strlenopt-38.c
    trunk/gcc/tree-ssa-strlen.c