K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-10-13T21:18:31.876870Z
K 7
svn:log
V 564
amd64: partially depessimize cpu_fetch_syscall_args and cpu_set_syscall_retval

Vast majority of syscalls take 6 or less arguments. Move handling of other
cases to a fallback function. Similarly, special casing for _syscall
and __syscall
magic syscalls is moved away.

Return is almost always 0. The change replaces 3 branches with 1 in the common
case. Also the 'frame' variable convinces clang not to reload it on each access.

Reviewed by:	kib
Approved by:	re (gjb)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17542

END