[Bug tree-optimization/57230] [4.7/4.8/4.9 Regression] tree-ssa-strlen incorrectly optimizes a strlen to 0

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57230

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 30080
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30080&action=edit
gcc49-pr57230.patch

Untested fix.

Note, for 4.9 there is another case I want to look at, in particular how to
adjust handle_char_store so that it will record character length even for the
char p[] = "hello world";
stmt.