RTAI API: base/math/w_asin.c Source File

00001 /* @(#)w_asin.c 5.1 93/09/24 */ 00002 /* 00003 * ==================================================== 00004 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 00005 * 00006 * Developed at SunPro, a Sun Microsystems, Inc. business. 00007 * Permission to use, copy, modify, and distribute this 00008 * software is freely granted, provided that this notice 00009 * is preserved. 00010 * ==================================================== 00011 */ 00012 00013 #if defined(LIBM_SCCS) && !defined(lint) 00014 static char rcsid[] = "$NetBSD: w_asin.c,v 1.6 1995/05/10 20:48:35 jtc Exp $"; 00015 #endif 00016 00017 /* 00018 * wrapper asin(x) 00019 */ 00020 00021 00022 #include "math.h" 00023 #include "mathP.h" 00024 00025 00026 #ifdef __STDC__ 00027 double asin(double x) /* wrapper asin */ 00028 #else 00029 double asin(x) /* wrapper asin */ 00030 double x; 00031 #endif 00032 { 00033 #ifdef _IEEE_LIBM 00034 return __ieee754_asin(x); 00035 #else 00036 double z; 00037 z = __ieee754_asin(x); 00038 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 00039 if(fabs(x)>1.0) { 00040 return __kernel_standard(x,x,2); /* asin(|x|>1) */ 00041 } else 00042 return z; 00043 #endif 00044 }