1 /* @(#)w_sqrt.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 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: w_sqrt.c,v 1.10 2013/11/19 19:24:34 joerg Exp $"); 16 #endif 17 18 /* 19 * wrapper sqrt(x) 20 */ 21 22 #include "namespace.h" 23 #include "math.h" 24 #include "math_private.h" 25 26 #ifndef __HAVE_LONG_DOUBLE 27 __strong_alias(_sqrtl, sqrt) 28 __weak_alias(sqrtl, _sqrtl) 29 #endif 30 31 double 32 sqrt(double x) /* wrapper sqrt */ 33 { 34 #ifdef _IEEE_LIBM 35 return __ieee754_sqrt(x); 36 #else 37 double z; 38 z = __ieee754_sqrt(x); 39 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 40 if(x<0.0) { 41 return __kernel_standard(x,x,26); /* sqrt(negative) */ 42 } else 43 return z; 44 #endif 45 } 46