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annotate libquadmath/math/isnanq.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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1 /* s_isnanl.c -- long double version of s_isnan.c.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
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3 */
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4
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5 /*
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6 * ====================================================
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7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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8 *
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9 * Developed at SunPro, a Sun Microsystems, Inc. business.
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10 * Permission to use, copy, modify, and distribute this
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11 * software is freely granted, provided that this notice
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12 * is preserved.
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13 * ====================================================
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14 */
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16 #if defined(LIBM_SCCS) && !defined(lint)
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17 static char rcsid[] = "$NetBSD: $";
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18 #endif
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20 /*
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21 * isnanq(x) returns 1 is x is nan, else 0;
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22 * no branching!
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23 */
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24
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25 #include "quadmath-imp.h"
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27 int isnanq(__float128 x)
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28 {
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29 int64_t hx,lx;
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30 GET_FLT128_WORDS64(hx,lx,x);
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31 hx &= 0x7fffffffffffffffLL;
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32 hx |= (uint64_t)(lx|(-lx))>>63;
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33 hx = 0x7fff000000000000LL - hx;
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34 return (int)((uint64_t)hx>>63);
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35 }