[Bug middle-end/67797] builtin functions should be able to know when their first argument is returned

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67797

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2015-12-23
          Component|target                      |middle-end
     Ever confirmed|0                           |1
            Summary|[ARM] Unnecessary r0 saving |builtin functions should be
                   |for memset call             |able to know when their
                   |                            |first argument is returned
           Severity|normal                      |enhancement

--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
This isn't target specific.  GCC does not currently realise that many string
functions return their first argument as a result.