real_plan make_real_plan (int length)
{
real_plan plan = (real_plan) malloc(sizeof(real_plan_i));
int pfsum = prime_factor_sum(length);
double comp1 = .5*length*pfsum;
double comp2 = 2*3*length*log(3.*length);
plan->length=length;
plan->bluestein = (comp2<comp1);
if (plan->bluestein)
bluestein_i (length,&(plan->work));
else
{
plan->work=(double *)malloc((2*length+15)*sizeof(double));
rffti(length, plan->work);
}
return plan;
}
real_plan make_real_plan (size_t length)
{
real_plan plan = RALLOC(real_plan_i,1);
size_t pfsum = prime_factor_sum(length);
double comp1 = .5*length*pfsum;
double comp2 = 2*3*length*log(3.*length);
comp2*=3; /* fudge factor that appears to give good overall performance */
plan->length=length;
plan->bluestein = (comp2<comp1);
if (plan->bluestein)
bluestein_i (length,&(plan->work));
else
{
plan->work=RALLOC(double,2*length+15);
rffti(length, plan->work);
}
return plan;
}
complex_plan make_complex_plan (size_t length)
{
complex_plan plan = RALLOC(complex_plan_i,1);
size_t pfsum = prime_factor_sum(length);
double comp1 = (double)(length*pfsum);
double comp2 = 2*3*length*log(3.*length);
comp2*=3.; /* fudge factor that appears to give good overall performance */
plan->length=length;
plan->bluestein = (comp2<comp1);
if (plan->bluestein)
bluestein_i (length,&(plan->work),&(plan->worksize));
else
{
plan->worksize=4*length+15;
plan->work=RALLOC(double,4*length+15);
cffti(length, plan->work);
}
return plan;
}