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glibc  2.9
s_copysignl.c
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00001 /* s_copysignl.c -- long double version of s_copysign.c.
00002  * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
00003  */
00004 
00005 /*
00006  * ====================================================
00007  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
00008  *
00009  * Developed at SunPro, a Sun Microsystems, Inc. business.
00010  * Permission to use, copy, modify, and distribute this
00011  * software is freely granted, provided that this notice
00012  * is preserved.
00013  * ====================================================
00014  */
00015 
00016 #if defined(LIBM_SCCS) && !defined(lint)
00017 static char rcsid[] = "$NetBSD: $";
00018 #endif
00019 
00020 /*
00021  * copysignl(long double x, long double y)
00022  * copysignl(x,y) returns a value with the magnitude of x and
00023  * with the sign bit of y.
00024  */
00025 
00026 #include "math.h"
00027 #include "math_private.h"
00028 
00029 #ifdef __STDC__
00030        long double __copysignl(long double x, long double y)
00031 #else
00032        long double __copysignl(x,y)
00033        long double x,y;
00034 #endif
00035 {
00036        u_int64_t hx,hy;
00037        GET_LDOUBLE_MSW64(hx,x);
00038        GET_LDOUBLE_MSW64(hy,y);
00039        SET_LDOUBLE_MSW64(x,(hx&0x7fffffffffffffffULL)
00040                          |(hy&0x8000000000000000ULL));
00041         return x;
00042 }
00043 weak_alias (__copysignl, copysignl)