src/libm/s_copysign.c
changeset 2756 a98604b691c8
child 3162 dc1eb82ffdaa
equal deleted inserted replaced
2755:2a3ec308d995 2756:a98604b691c8
       
     1 /* @(#)s_copysign.c 5.1 93/09/24 */
       
     2 /*
       
     3  * ====================================================
       
     4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
       
     5  *
       
     6  * Developed at SunPro, a Sun Microsystems, Inc. business.
       
     7  * Permission to use, copy, modify, and distribute this
       
     8  * software is freely granted, provided that this notice
       
     9  * is preserved.
       
    10  * ====================================================
       
    11  */
       
    12 
       
    13 #if defined(LIBM_SCCS) && !defined(lint)
       
    14 static char rcsid[] =
       
    15     "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
       
    16 #endif
       
    17 
       
    18 /*
       
    19  * copysign(double x, double y)
       
    20  * copysign(x,y) returns a value with the magnitude of x and
       
    21  * with the sign bit of y.
       
    22  */
       
    23 
       
    24 #include "math.h"
       
    25 #include "math_private.h"
       
    26 
       
    27 libm_hidden_proto(copysign)
       
    28 #ifdef __STDC__
       
    29      double copysign(double x, double y)
       
    30 #else
       
    31      double copysign(x, y)
       
    32      double x, y;
       
    33 #endif
       
    34 {
       
    35     u_int32_t hx, hy;
       
    36     GET_HIGH_WORD(hx, x);
       
    37     GET_HIGH_WORD(hy, y);
       
    38     SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
       
    39     return x;
       
    40 }
       
    41 
       
    42 libm_hidden_def(copysign)