On Thu, 14 Dec 2000, Iain Templeton wrote:
> On Wed, 13 Dec 2000, Alfred Perlstein wrote:
>
> > subl $8,%esp
> > addl $-8,%esp
> > pushl $0
> > pushl $.LC0
> > call open
> >
> > why the subl then addl?
> >
> Well, as a thoroughly rough guess, the subl is probably to create space
> on the stack for the args, and the addl is to align the stack to a 16
> byte address?
>
Perhaps, but no matter the degree of optimisation, the
16 byte of space is performed in two instructions. This
leads me to believe is it most likely a pipelining issue
for the following pushl instructions. As for subl'ing and
addl'ing 8 bytes instead of 4, as required by each pushl,
that can very well be an aligning issue which would seem
to make more sense for the x86.
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