[Bug inline-asm/63900] memory constrains needlessly doing memory clobber

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63900

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |NEW
   Last reconfirmed|                            |2014-11-16
                 CC|                            |segher at gcc dot gnu.org
         Resolution|INVALID                     |---
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Reopened; this is a perfectly valid missed optimisation.

Nothing here does a "full memory clobber"; instead, CSE simply doesn't
know how to handle a three-byte datum.