src/libm/s_copysign.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 26 May 2015 21:19:23 -0400
changeset 9649 d7762e30ba24
parent 6044 35448a5ea044
child 11683 48bcba563d9c
permissions -rw-r--r--
Stack hint should look for 0, not -1, and not care about environment variables.
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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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#if defined(LIBM_SCCS) && !defined(lint)
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static const char rcsid[] =
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    "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
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#endif
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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 "math_libm.h"
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#include "math_private.h"
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libm_hidden_proto(copysign)
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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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    u_int32_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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libm_hidden_def(copysign)