"TMS320C55x DSP Library DSPLIB Programmer's Reference"

log_10Special Requirements noneImplementation Notes y = 0.4343 * ln(x) with x = M(x)*2^P(x) = M*2^Py = 0.4343 * (ln(M) + ln(2)*P)y = 0.4343 * (ln(2*M) + (P–1)*ln(2))y = 0.4343 * (ln((2*M–1)+1) + (P–1)*ln(2))y = 0.4343 * (f(2*M–1) + (P–1)*ln(2))with f(u) = ln(1+u).We use a polynomial approximation for f(u) :f(u) = (((((C6*u+C5)*u+C4)*u+C3)*u+C2)*u+C1)*u+C0for 0