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glibc/math/w_exp2f.c
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/* | |
* wrapper exp2f(x) | |
*/ | |
#include <float.h> | |
#include "math.h" | |
#include "math_private.h" | |
static const float o_threshold= (float) FLT_MAX_EXP; | |
static const float u_threshold= (float) FLT_MIN_EXP; | |
float | |
__exp2f (float x) /* wrapper exp2f */ | |
{ | |
#ifdef _IEEE_LIBM | |
return __ieee754_exp2f (x); | |
#else | |
float z; | |
z = __ieee754_exp2f (x); | |
if (_LIB_VERSION != _IEEE_ && __finitef (x)) | |
{ | |
if (x > o_threshold) | |
/* exp2 overflow */ | |
return (float) __kernel_standard ((double) x, (double) x, 144); | |
else if (x < u_threshold) | |
/* exp2 underflow */ | |
return (float) __kernel_standard ((double) x, (double) x, 145); | |
} | |
return z; | |
#endif | |
} | |
weak_alias (__exp2f, exp2f) |