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lgamma-and-gamma-using-SSE2

2020-01-14 | |  28 |   0 |   0

lgamma-and-gamma-using-SSE2

Implementation of the Log Gamma and Gamma functions in 64-bit assembly.

c-ish version: lgamma(z):

int j;
double x, tmp, y, ser;
if (z <= 0) return NAN;
y = x = z;
tmp = x + 5.2421875;
tmp = (x + 0.5) * log(tmp) - tmp
ser = 0.999999999999997092;
for (int j = 0; j < 14; j++) 
	ser += cof[j] / ++y;

return tmp + log(2.5066282746310005 * ser / x);

gamma(z):

return exp(lgamma(z))


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