diff options
Diffstat (limited to 'libc/math/w_exp2.c')
| -rw-r--r-- | libc/math/w_exp2.c | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/libc/math/w_exp2.c b/libc/math/w_exp2.c index 446e5ea91..bf223265c 100644 --- a/libc/math/w_exp2.c +++ b/libc/math/w_exp2.c @@ -4,30 +4,20 @@ #include <float.h> #include <math.h> -#include "math_private.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); +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 */ +__exp2 (double x) { -#ifdef _IEEE_LIBM + if (__builtin_expect (x <= u_threshold || x > o_threshold, 0) + && _LIB_VERSION != _IEEE_ && __finite (x)) + /* exp2 overflow: 44, exp2 underflow: 45 */ + return __kernel_standard (x, x, 44 + (x <= o_threshold)); + 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 |