| /* |
| * 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 - DBL_MANT_DIG - 1); |
| |
| 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, __exp2l) |
| weak_alias (__exp2, exp2l) |
| #endif |
