| 1 | /* s_isnanl.c -- long double version for i387 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 | |
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| 27 | int __isnanl(long double x) |
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| 28 | { |
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| 29 | int32_t se,hx,lx,pn; |
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| 30 | GET_LDOUBLE_WORDS(se,hx,lx,x); |
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| 31 | se = (se & 0x7fff) << 1; |
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| 32 | /* Detect pseudo-normal numbers, i.e. exponent is non-zero and the top |
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| 33 | bit of the significand is not set. */ |
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| 34 | pn = (uint32_t)((~hx & 0x80000000) & (se|(-se)))>>31; |
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| 35 | /* Clear the significand bit when computing mantissa. */ |
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| 36 | lx |= hx & 0x7fffffff; |
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| 37 | se |= (uint32_t)(lx|(-lx))>>31; |
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| 38 | se = 0xfffe - se; |
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| 39 | |
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| 40 | return (int)(((uint32_t)(se)) >> 16) | pn; |
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| 41 | } |
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| 42 | hidden_def (__isnanl) |
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| 43 | weak_alias (__isnanl, isnanl) |
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| 44 | |
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