[Bug middle-end/84029] Partially inline strcmp

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84029

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-01-25
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
If we know the length of either argument and the other argument is properly
aligned we can do a 2, 4 or 8 byte compare upfront.  Not sure how often that
happens (esp. with regard to knowing alignment to make sure there's no
page fault).

Note this optimization has a code-size impact and thus should be done only
for hot code regions, eventually based on a value-profile?