On Wed, 13 Dec 2000, Alfred Perlstein wrote:
> * Marc Tardif <[EMAIL PROTECTED]> [001213 13:30] wrote:
[ snip ]
> > subl $8,%esp
> > addl $-8,%esp
> > pushl $0
> > pushl $.LC0
> > call open
>
> FreeBSD passes syscall args on the stack, Linux uses registers.
>
So why is %esp displaced by 16 bytes when only 8 bytes
are necessary (4 for $0 and 4 for $.LC0)? And couldn't
the compiler use a single instruction such as
subl $16,%esp or addl $-16,%esp? Are two instructions
used for pipelining purposes, where subl is synchro-
nised with the first pushl and addl with the second
pushl?
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