diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_copysign.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_copysign.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_copysign.c b/sysdeps/libm-ieee754/s_copysign.c new file mode 100644 index 0000000000..b86ac76013 --- /dev/null +++ b/sysdeps/libm-ieee754/s_copysign.c @@ -0,0 +1,39 @@ +/* @(#)s_copysign.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $"; +#endif + +/* + * copysign(double x, double y) + * copysign(x,y) returns a value with the magnitude of x and + * with the sign bit of y. + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + double __copysign(double x, double y) +#else + double __copysign(x,y) + double x,y; +#endif +{ + u_int32_t hx,hy; + GET_HIGH_WORD(hx,x); + GET_HIGH_WORD(hy,y); + SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); + return x; +} +weak_alias (__copysign, copysign) |