mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 03:31:07 +00:00
37 lines
710 B
C
37 lines
710 B
C
/*
|
|
* wrapper exp2(x)
|
|
*/
|
|
|
|
#include <float.h>
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
static const double o_threshold= (double) DBL_MAX_EXP;
|
|
static const double u_threshold= (double) DBL_MIN_EXP;
|
|
|
|
double
|
|
__exp2 (double x) /* wrapper exp2 */
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_exp2 (x);
|
|
#else
|
|
double z;
|
|
z = __ieee754_exp2 (x);
|
|
if (_LIB_VERSION != _IEEE_ && __finite (x))
|
|
{
|
|
if (x > o_threshold)
|
|
/* exp2 overflow */
|
|
return __kernel_standard (x, x, 44);
|
|
else if (x < u_threshold)
|
|
/* exp2 underflow */
|
|
return __kernel_standard (x, x, 45);
|
|
}
|
|
return z;
|
|
#endif
|
|
}
|
|
weak_alias (__exp2, exp2)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__exp2, __expl2)
|
|
weak_alias (__exp2, expl2)
|
|
#endif
|