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| author | Ulrich Drepper <drepper@redhat.com> | 2009-08-26 00:51:45 -0700 |
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| committer | Ulrich Drepper <drepper@redhat.com> | 2009-08-26 00:51:45 -0700 |
| commit | 2df4be8c3545f6158e468660a73f794573fb6f07 (patch) | |
| tree | ec06cffcb2f9117507ad309fe749b86704b06158 /sysdeps | |
| parent | 15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a (diff) | |
| download | glibc-2df4be8c3545f6158e468660a73f794573fb6f07.zip glibc-2df4be8c3545f6158e468660a73f794573fb6f07.tar.gz glibc-2df4be8c3545f6158e468660a73f794573fb6f07.tar.bz2 | |
Add isinf optimized for 64-bit.
Diffstat (limited to 'sysdeps')
| -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 0000000..c48e979 --- /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 |