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author | Jakub Jelinek <jakub@redhat.com> | 2005-12-19 12:11:38 +0000 |
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committer | Jakub Jelinek <jakub@redhat.com> | 2005-12-19 12:11:38 +0000 |
commit | 2c6cfe6853a30deb4af842aacc924fa298d0521a (patch) | |
tree | 7fcc409e499bb8e3d96522f7fc2393fc10e53db2 /math/w_exp2.c | |
parent | 3ccb96cd41b38d0159bdf8aad229c3599864c65d (diff) | |
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Updated to fedora-glibc-20051219T1003cvs/fedora-glibc-2_3_90-19
Diffstat (limited to 'math/w_exp2.c')
-rw-r--r-- | math/w_exp2.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/math/w_exp2.c b/math/w_exp2.c new file mode 100644 index 0000000000..446e5ea91c --- /dev/null +++ b/math/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 - 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 |