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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
| commit | 0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch) | |
| tree | f9d26c8abc0de39d18d4c13e70f6022cdc6b461f /math/w_exp2.c | |
| parent | a843a204a3e8a0dd53584dad3668771abaec84ac (diff) | |
| download | glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz | |
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.
Diffstat (limited to 'math/w_exp2.c')
| -rw-r--r-- | math/w_exp2.c | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/math/w_exp2.c b/math/w_exp2.c index c92fb52ad0..bf223265cb 100644 --- a/math/w_exp2.c +++ b/math/w_exp2.c @@ -6,28 +6,18 @@ #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); +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 |