float
__log2f (float x) /* wrapper log2f */
{
#ifdef _IEEE_LIBM
return __ieee754_log2f (x);
#else
float z;
z = __ieee754_log2f (x);
if (_LIB_VERSION == _IEEE_ || __isnanf (x)) return z;
if (x <= 0.0f)
{
if (x == 0.0f)
/* log2f (0) */
return __kernel_standard ((double) x, (double) x, 148);
else
/* log2f (x < 0) */
return __kernel_standard ((double) x, (double) x, 149);
}
else
return z;
#endif
}
/* wrapper log2f(x) */
float
__log2f (float x)
{
if (__builtin_expect (islessequal (x, 0.0f), 0) && _LIB_VERSION != _IEEE_)
{
if (x == 0.0)
{
feraiseexcept (FE_DIVBYZERO);
return __kernel_standard_f (x, x, 148); /* log2(0) */
}
else
{
feraiseexcept (FE_INVALID);
return __kernel_standard_f (x, x, 149); /* log2(x<0) */
}
}
return __ieee754_log2f (x);
}
