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 /* 14 * copysign(double x, double y) 15 * copysign(x,y) returns a value with the magnitude of x and 16 * with the sign bit of y. 17 */ 18 19 /* LINTLIBRARY */ 20 21 #include <sys/cdefs.h> 22 #include <float.h> 23 #include <math.h> 24 25 #include "math_private.h" 26 27 double 28 copysign(double x, double y) 29 { 30 u_int32_t hx,hy; 31 GET_HIGH_WORD(hx,x); 32 GET_HIGH_WORD(hy,y); 33 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); 34 return x; 35 } 36 37 #if LDBL_MANT_DIG == 53 38 #ifdef lint 39 /* PROTOLIB1 */ 40 long double copysignl(long double, long double); 41 #else /* lint */ 42 __weak_alias(copysignl, copysign); 43 #endif /* lint */ 44 #endif /* LDBL_MANT_DIG == 53 */ 45