diff options
Diffstat (limited to 'sysdeps/libm-ieee754/w_exp2.c')
| -rw-r--r-- | sysdeps/libm-ieee754/w_exp2.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/w_exp2.c b/sysdeps/libm-ieee754/w_exp2.c new file mode 100644 index 0000000000..126aa090bc --- /dev/null +++ b/sysdeps/libm-ieee754/w_exp2.c @@ -0,0 +1,36 @@ +/* + * 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 |