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| author | Ulrich Drepper <drepper@redhat.com> | 2009-08-26 00:12:58 -0700 |
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| committer | Ulrich Drepper <drepper@redhat.com> | 2009-08-26 00:12:58 -0700 |
| commit | 15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a (patch) | |
| tree | 3e2bc0fbdced3092dfa2dd2911b234799fa856a5 /sysdeps | |
| parent | deb13bcda9a63ea65a82df138d71c803f963c8a7 (diff) | |
| download | glibc-15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a.tar glibc-15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a.tar.gz glibc-15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a.tar.bz2 glibc-15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a.zip | |
Optimized isnan for 64-bit machines.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c new file mode 100644 index 0000000000..3b08c54dd4 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c @@ -0,0 +1,39 @@ +/* @(#)s_isnan.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* + * isnan(x) returns 1 is x is nan, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + int __isnan(double x) +#else + int __isnan(x) + double x; +#endif +{ + int64_t hx; + EXTRACT_WORDS64(hx,x); + hx &= UINT64_C(0x7fffffffffffffff); + hx = UINT64_C(0x7ff0000000000000) - hx; + return (int)(((uint64_t)hx)>>63); +} +hidden_def (__isnan) +weak_alias (__isnan, isnan) +#ifdef NO_LONG_DOUBLE +strong_alias (__isnan, __isnanl) +weak_alias (__isnan, isnanl) +#endif |