src/libm/s_copysign.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Sun, 28 Dec 2014 22:00:24 +0100
changeset 9301 7377a9a3aed6
parent 6044 35448a5ea044
child 11683 48bcba563d9c
permissions -rw-r--r--
Renamed README-emscripten.txt to README-emscripten.md.
     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 const 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_libm.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)