diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c b/REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c new file mode 100644 index 0000000000..bcff9e3b67 --- /dev/null +++ b/REORG.TODO/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> +#include <shlib-compat.h> +#include <stdint.h> + +#undef __isnan +int __isnan(double x) +{ + 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 +# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23) +compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); +# endif +weak_alias (__isnan, isnanl) +#endif |