log1pf
log1pf is a function in the C standard math library that computes the natural logarithm of 1 plus a floating-point input, specifically for float precision. It is declared in <math.h> with the prototype float log1pf(float x). The function is designed to provide higher accuracy than a straightforward call to logf(1+x) when x is small, by reducing cancellation errors that can occur near x = 0.
Domain and behavior: The mathematical domain is -1 < x. When x equals -1, the result is -infinity,
Implementation notes: Implementations typically use a range reduction combined with carefully chosen polynomial or rational approximations
See also: log1p, logf, log, and the broader set of special mathematical functions in the C standard