[Bug target/53133] XOR AL,AL to zero lower 8 bits of EAX/RAX causes partial register stall (Intel Core 2)

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53133

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2012-04-30 13:26:32 
UTC ---
(In reply to comment #2)
> 
> H.J., should we consider these processors as affected by partial reg stall?

We will investigate.