diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c new file mode 100644 index 0000000000..c48e979a84 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c @@ -0,0 +1,30 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>. + * Public domain. + */ + +/* + * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +int +__isinf (double x) +{ + int64_t ix; + EXTRACT_WORDS64(ix,x); + int64_t t = ix & UINT64_C(0x7fffffffffffffff); + t ^= UINT64_C(0x7ff0000000000000); + t |= -t; + return ~(t >> 63) & (ix >> 62); +} +hidden_def (__isinf) +weak_alias (__isinf, isinf) +#ifdef NO_LONG_DOUBLE +strong_alias (__isinf, __isinfl) +weak_alias (__isinf, isinfl) +#endif |