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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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/* Copyright 2016 Samsung Electronics Co., Ltd.
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* Copyright 2016 University of Szeged
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is based on work under the following copyright and permission
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* notice:
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*
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunSoft, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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*
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* @(#)s_isnan.c 1.3 95/01/18
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*/
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#include "jerry-libm-internal.h"
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/* isnan(x) returns 1 is x is nan, else 0;
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* no branching!
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*/
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int
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isnan (double x)
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{
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int hx, lx;
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hx = (__HI (x) & 0x7fffffff);
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lx = __LO (x);
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hx |= (unsigned) (lx | (-lx)) >> 31;
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hx = 0x7ff00000 - hx;
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return ((unsigned) (hx)) >> 31;
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} /* isnan */
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