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annotate src/libm/s_copysign.c @ 3331:d44a0a913aa2

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Eric Wing to Sam Lots of fixes. Fixed missing power management building. Added template icons to the project templates. DocSet stuff Documentation fixes.. Fixed all the SDLtests. (Lots of tedious work.) It now depends on the static library target for convenience so I am not going to remove it from the SDL xcode project.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 01 Oct 2009 15:30:26 +0000
parents dc1eb82ffdaa
children
rev   line source
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a98604b691c8 Expanded the libm support and put it into a separate directory.
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1 /* @(#)s_copysign.c 5.1 93/09/24 */
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2 /*
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3 * ====================================================
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4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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5 *
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6 * Developed at SunPro, a Sun Microsystems, Inc. business.
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7 * Permission to use, copy, modify, and distribute this
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8 * software is freely granted, provided that this notice
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9 * is preserved.
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10 * ====================================================
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11 */
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12
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13 #if defined(LIBM_SCCS) && !defined(lint)
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14 static const char rcsid[] =
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15 "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
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16 #endif
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17
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18 /*
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19 * copysign(double x, double y)
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20 * copysign(x,y) returns a value with the magnitude of x and
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21 * with the sign bit of y.
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22 */
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23
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24 #include "math.h"
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25 #include "math_private.h"
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26
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27 libm_hidden_proto(copysign)
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28 #ifdef __STDC__
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29 double copysign(double x, double y)
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30 #else
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31 double copysign(x, y)
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32 double x, y;
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33 #endif
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34 {
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35 u_int32_t hx, hy;
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36 GET_HIGH_WORD(hx, x);
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37 GET_HIGH_WORD(hy, y);
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38 SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
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39 return x;
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40 }
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41
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42 libm_hidden_def(copysign)