On Wed, Mar 07, 2007 at 08:13:21AM -0800, H. J. Lu wrote:
> > BTW: Does CORE2 also prefer sahf?
>
> Compared with what?
Bit tests vs ax. E.g.
fnstsw %ax
testb $1, %ah
jne .L5
vs
fnstsw %ax
sahf
jb .L5
Though I guess it really ought not make any difference
whatsoever, because 64-bit should always use fcomi.
r~