K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2011-09-11T16:08:10.659727Z
K 7
svn:log
V 372
Perform amd64-specific microoptimizations for native syscall entry
sequence. The effect is ~1% on the microbenchmark.

In particular, do not restore registers which are preserved by the
C calling sequence. Align the jump target. Avoid unneeded memory
accesses by calculating some data in syscall entry trampoline.

Reviewed by:	jhb
Approved by:	re (bz)
MFC after:	2 weeks

END