[thirdparty/glibc.git] / math / w_log2.c

/*
 * wrapper log2(X)
 */

#include <math.h>
#include <math_private.h>

double
__log2 (double x)	/* wrapper log2 */
{
#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
}
weak_alias (__log2, log2)
#ifdef NO_LONG_DOUBLE
strong_alias (__log2, __log2l)
weak_alias (__log2, log2l)
#endif
Commit	Line	Data
601d2942 UD	1	/*
	2	* wrapper log2(X)
	3	*/
	4
9d13fb24	5	#include <math.h>
9277c064	6	#include <math_private.h>
601d2942 UD	7
	8	double
	9	__log2 (double x) /* wrapper log2 */
	10	{
	11	#ifdef _IEEE_LIBM
	12	return __ieee754_log2 (x);
	13	#else
	14	double z;
	15	z = __ieee754_log2 (x);
	16	if (_LIB_VERSION == _IEEE_ \|\| __isnan (x)) return z;
	17	if (x <= 0.0)
	18	{
	19	if (x == 0.0)
	20	return __kernel_standard (x, x, 48); /* log2 (0) */
	21	else
	22	return __kernel_standard (x, x, 49); /* log2 (x < 0) */
	23	}
	24	else
	25	return z;
	26	#endif
	27	}
	28	weak_alias (__log2, log2)
	29	#ifdef NO_LONG_DOUBLE
	30	strong_alias (__log2, __log2l)
	31	weak_alias (__log2, log2l)
	32	#endif