view src/libm/s_copysign.c @ 2998:d364ee9b9c15

Date: Sun, 04 Jan 2009 20:53:30 +0100 From: Couriersud Subject: SDL1.3 DirectFB patches The attached contains the following directfb changes: - Dynamic loading of libdirectfb.so. This may to turned off as well in configure - Use linux-input by default. May be switched off by environment variable. - Added some code which will use directfb's x11 backend when DISPLAY is set.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 23:43:33 +0000
parents a98604b691c8
children dc1eb82ffdaa
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/* @(#)s_copysign.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] =
    "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
#endif

/*
 * copysign(double x, double y)
 * copysign(x,y) returns a value with the magnitude of x and
 * with the sign bit of y.
 */

#include "math.h"
#include "math_private.h"

libm_hidden_proto(copysign)
#ifdef __STDC__
     double copysign(double x, double y)
#else
     double copysign(x, y)
     double x, y;
#endif
{
    u_int32_t hx, hy;
    GET_HIGH_WORD(hx, x);
    GET_HIGH_WORD(hy, y);
    SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
    return x;
}

libm_hidden_def(copysign)