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mathlog a float is required. Mathlogx base doesnt literally mean put base in brackets. The value to determine the base-2 logarithm of.
C onlylong double log2 long double x. C allows overloading so you can call overloads of log and log10 that take and return float or long double values. A float is required.
If x is negative return ulp-x.
If x is a NaN not a number return x. Ranges library C20 Algorithms library. Not all approximations that have 1 ulp accuracy will. Log and log10 have an implementation that uses Streaming SIMD Extensions 2 SSE2.