41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
|
/* @(#)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 <ldbl-classify-compat.h>
|
||
|
|
#include <shlib-compat.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
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 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
|