[Bug target/46357] Unnecessary movzx instruction

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46357

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-08 
10:44:31 UTC ---
We always use zero/sign-extending moves to avoid partial register stalls.