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Re: inline asm problem
TWISTI <twisti@fusion.at> writes:
> On Mon, 2002-03-18 at 18:46, DJ Delorie wrote:
> > Why not this?
> > asm("mov %0, %%mm1" : : "m" (filt_cos[n]));
> >
> > You don't have to be *that* clever, as gcc *does* know how to handle
> > things like this on its own.
> >
>
> Would be possible, but counter is in %eax and i need fastest execution
> possible. Assignment to `n' isn't that clever i think.
You need to read up about gcc constraints, which is a subject for the
gcc list, not for here. You can use constraints to force gcc to put a
value into a particular set of registers, which I think is what you
want. See
http://gcc.gnu.org/onlinedocs/gcc-3.0.3/gcc_20.html#SEC216
with particular attention to the i386 section in
http://gcc.gnu.org/onlinedocs/gcc-3.0.3/gcc_20.html#SEC221
Ian