[Bug tree-optimization/86914] [8/9 Regression] -O2 generates wrong code with strlen() of pointers within one-element arrays of structures

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86914

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Aug 28 00:25:50 2018
New Revision: 263905

URL: https://gcc.gnu.org/viewcvs?rev=263905&root=gcc&view=rev
Log:
PR tree-optimization/86914 - wrong code with strlen() of poor-man's flexible
array member plus offset

gcc/ChangeLog:

        PR tree-optimization/86914
        * tree-ssa-strlen.c (maybe_set_strlen_range): Avoid MEM_REF.

gcc/testsuite/ChangeLog:

        PR tree-optimization/86914
        * gcc.dg/strlenopt-57.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/strlenopt-57.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c