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glibc/math/w_exp2.c
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/* | |
* 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 |