| 1 | /* s_isnanl.c -- long double version of s_isnan.c. |
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| 2 | */ |
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| 3 | |
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| 4 | /* |
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| 5 | * ==================================================== |
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| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 7 | * |
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| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 9 | * Permission to use, copy, modify, and distribute this |
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| 10 | * software is freely granted, provided that this notice |
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| 11 | * is preserved. |
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| 12 | * ==================================================== |
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| 13 | */ |
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| 14 | |
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| 15 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 16 | static char rcsid[] = "$NetBSD: $" ; |
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| 17 | #endif |
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| 18 | |
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| 19 | /* |
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| 20 | * isnanl(x) returns 1 is x is nan, else 0; |
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| 21 | * no branching! |
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| 22 | */ |
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| 23 | |
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| 24 | #include <math.h> |
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| 25 | #include <math_private.h> |
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| 26 | #include <math_ldbl_opt.h> |
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| 27 | |
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| 28 | int |
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| 29 | ___isnanl (long double x) |
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| 30 | { |
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| 31 | uint64_t hx; |
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| 32 | double xhi; |
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| 33 | |
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| 34 | xhi = ldbl_high (x); |
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| 35 | EXTRACT_WORDS64 (hx, xhi); |
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| 36 | hx &= 0x7fffffffffffffffLL; |
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| 37 | hx = 0x7ff0000000000000LL - hx; |
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| 38 | return (int) (hx >> 63); |
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| 39 | } |
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| 40 | hidden_ver (___isnanl, __isnanl) |
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| 41 | #if !IS_IN (libm) |
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| 42 | weak_alias (___isnanl, ____isnanl) |
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| 43 | long_double_symbol (libc, ___isnanl, isnanl); |
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| 44 | long_double_symbol (libc, ____isnanl, __isnanl); |
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| 45 | #endif |
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| 46 | |
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