[Bug target/79144] cmpstrnsi optimization breaks glibc

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79144

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2017-01-19
           Assignee|unassigned at gcc dot gnu.org      |amodra at gmail dot com
     Ever confirmed|0                           |1

--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
Testing a fix