[Bug tree-optimization/81703] memcpy folding defeats strlen optimization

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81703

--- Comment #2 from prathamesh3492 at gcc dot gnu.org ---
Author: prathamesh3492
Date: Thu Jan 11 04:37:48 2018
New Revision: 256475

URL: https://gcc.gnu.org/viewcvs?rev=256475&root=gcc&view=rev
Log:
2018-01-11  Martin Sebor  <msebor@gmail.com>
            Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

        PR tree-optimization/83501
        PR tree-optimization/81703

        * tree-ssa-strlen.c (get_string_cst): Rename...
        (get_string_len): ...to this.  Handle global constants.
        (handle_char_store): Adjust.

testsuite/
        * gcc.dg/strlenopt-39.c: New test-case.
        * gcc.dg/pr81703.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/pr81703.c
    trunk/gcc/testsuite/gcc.dg/strlenopt-39.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c