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83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
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/* @(#)s_copysign.c 5.1 93/09/24 */
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/*
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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 SunPro, 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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*/
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/*
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FUNCTION
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<<copysign>>, <<copysignf>>---sign of <[y]>, magnitude of <[x]>
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INDEX
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copysign
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INDEX
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copysignf
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ANSI_SYNOPSIS
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#include <math.h>
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double copysign (double <[x]>, double <[y]>);
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float copysignf (float <[x]>, float <[y]>);
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TRAD_SYNOPSIS
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#include <math.h>
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double copysign (<[x]>, <[y]>)
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double <[x]>;
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double <[y]>;
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float copysignf (<[x]>, <[y]>)
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float <[x]>;
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float <[y]>;
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DESCRIPTION
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<<copysign>> constructs a number with the magnitude (absolute value)
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of its first argument, <[x]>, and the sign of its second argument,
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<[y]>.
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<<copysignf>> does the same thing; the two functions differ only in
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the type of their arguments and result.
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RETURNS
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<<copysign>> returns a <<double>> with the magnitude of
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<[x]> and the sign of <[y]>.
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<<copysignf>> returns a <<float>> with the magnitude of
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<[x]> and the sign of <[y]>.
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PORTABILITY
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<<copysign>> is not required by either ANSI C or the System V Interface
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Definition (Issue 2).
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*/
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/*
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* copysign(double x, double y)
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* copysign(x,y) returns a value with the magnitude of x and
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* with the sign bit of y.
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*/
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#include "fdlibm.h"
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double copysign(double x, double y)
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#else
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double copysign(x,y)
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double x,y;
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#endif
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{
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__uint32_t hx,hy;
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GET_HIGH_WORD(hx,x);
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GET_HIGH_WORD(hy,y);
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SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
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return x;
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}
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#endif /* _DOUBLE_IS_32BITS */
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