On 02/15, Julius Smith wrote:
>
> Along these lines, we could have a more efficient impulse as well. We
> presently use this all over the place:
>
> process = 1-1';
> =>
> for (int i = 0; (i < count); i = (i + 1)) {
> iVec0[0] = 1;
> output0[i] = FAUSTFLOAT((1 - iVec0[1]));
> iVec0[1] = iVec0[0];
> }
Yes,
impulse = FPP() int {
decl: int imp = 1;
post: imp = 0;
exec: imp;
};
process = impulse;
=>
class mydsp : public dsp {
private:
int imp = 1;
...
virtual void compute(int count, FAUSTFLOAT** inputs, FAUSTFLOAT**
outputs) {
FAUSTFLOAT* output0 = outputs[0];
for (int i = 0; (i < count); i = (i + 1)) {
output0[i] = FAUSTFLOAT(imp);
imp = 0;
}
}
looks better ;)
in any case 1-1' looks suboptimal. prefix(1,0) makes more sense and it
could generate the same code. I am a bit surprised it doesn't... Plus
it is always broken. Say,
prefix(1) : mem;
leads to
ERROR : no vector name for : prefix(1,IN[0])
Oleg.
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