[Bug tree-optimization/83896] [8 Regression] ice in get_string_len on a call to strlen with non-constant length

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83896

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Fri Jan 26 16:47:22 2018
New Revision: 257100

URL: https://gcc.gnu.org/viewcvs?rev=257100&root=gcc&view=rev
Log:
PR tree-optimization/83896 - ice in get_string_len on a call to strlen with
non-constant length

gcc/ChangeLog:

        PR tree-optimization/83896
        * tree-ssa-strlen.c (get_string_len): Rename...
        (get_string_cst_length): ...to this.  Return HOST_WIDE_INT.
        Avoid assuming length is constant.
        (handle_char_store): Use HOST_WIDE_INT for string length.

gcc/testsuite/ChangeLog:

        PR tree-optimization/83896
        * gcc.dg/strlenopt-43.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/strlenopt-43.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c