Konstantin Belousov 7a1c55c380 Microoptimize the return path for the fast syscalls on amd64. Arrange
the code to have the fall-through path to follow the likely target.
Do not use intermediate register to reload user %rsp.

Proposed by:	alc
Reviewed by:	alc, jhb
Approved by:	re (bz)
MFC after:	2 weeks
2011-09-15 09:53:04 +00:00
..