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glibc  2.9
Functions
w_log2.c File Reference
#include <math.h>
#include "math_private.h"
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Functions

double __log2 (double x)

Function Documentation

double __log2 ( double  x)

Definition at line 9 of file w_log2.c.

{
#ifdef _IEEE_LIBM
  return __ieee754_log2 (x);
#else
  double z;
  z = __ieee754_log2 (x);
  if (_LIB_VERSION == _IEEE_ || __isnan (x)) return z;
  if (x <= 0.0)
    {
      if (x == 0.0)
       return __kernel_standard (x, x, 48); /* log2 (0) */
      else
       return __kernel_standard (x, x, 49); /* log2 (x < 0) */
    }
  else
    return z;
#endif
}

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