RTAI API: base/math/s_copysign.c Source File

00001 #if !defined(__ppc__)
00002 /* @(#)s_copysign.c 5.1 93/09/24 */
00003 /*
00004  * ====================================================
00005  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
00006  *
00007  * Developed at SunPro, a Sun Microsystems, Inc. business.
00008  * Permission to use, copy, modify, and distribute this
00009  * software is freely granted, provided that this notice 
00010  * is preserved.
00011  * ====================================================
00012  */
00013 
00014 #if defined(LIBM_SCCS) && !defined(lint)
00015 static char rcsid[] = "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
00016 #endif
00017 
00018 /*
00019  * copysign(double x, double y)
00020  * copysign(x,y) returns a value with the magnitude of x and
00021  * with the sign bit of y.
00022  */
00023 
00024 #include "math.h"
00025 #include "mathP.h"
00026 
00027 #ifdef __STDC__
00028     double copysign(double x, double y)
00029 #else
00030     double copysign(x,y)
00031     double x,y;
00032 #endif
00033 {
00034     u_int32_t hx,hy;
00035     GET_HIGH_WORD(hx,x);
00036     GET_HIGH_WORD(hy,y);
00037     SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
00038         return x;
00039 }
00040 #endif