1*05a0b428SJohn Marino /* @(#)s_copysign.c 5.1 93/09/24 */
2*05a0b428SJohn Marino /*
3*05a0b428SJohn Marino * ====================================================
4*05a0b428SJohn Marino * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5*05a0b428SJohn Marino *
6*05a0b428SJohn Marino * Developed at SunPro, a Sun Microsystems, Inc. business.
7*05a0b428SJohn Marino * Permission to use, copy, modify, and distribute this
8*05a0b428SJohn Marino * software is freely granted, provided that this notice
9*05a0b428SJohn Marino * is preserved.
10*05a0b428SJohn Marino * ====================================================
11*05a0b428SJohn Marino */
12*05a0b428SJohn Marino
13*05a0b428SJohn Marino /*
14*05a0b428SJohn Marino * copysign(double x, double y)
15*05a0b428SJohn Marino * copysign(x,y) returns a value with the magnitude of x and
16*05a0b428SJohn Marino * with the sign bit of y.
17*05a0b428SJohn Marino */
18*05a0b428SJohn Marino
19*05a0b428SJohn Marino #include <float.h>
20*05a0b428SJohn Marino #include <math.h>
21*05a0b428SJohn Marino
22*05a0b428SJohn Marino #include "math_private.h"
23*05a0b428SJohn Marino
24*05a0b428SJohn Marino double
copysign(double x,double y)25*05a0b428SJohn Marino copysign(double x, double y)
26*05a0b428SJohn Marino {
27*05a0b428SJohn Marino u_int32_t hx,hy;
28*05a0b428SJohn Marino GET_HIGH_WORD(hx,x);
29*05a0b428SJohn Marino GET_HIGH_WORD(hy,y);
30*05a0b428SJohn Marino SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
31*05a0b428SJohn Marino return x;
32*05a0b428SJohn Marino }
33*05a0b428SJohn Marino
34*05a0b428SJohn Marino #if LDBL_MANT_DIG == DBL_MANT_DIG
35*05a0b428SJohn Marino __strong_alias(copysignl, copysign);
36*05a0b428SJohn Marino #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
37