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      1 /*	$NetBSD: w_acos.c,v 1.11 2024/06/09 13:35:38 riastradh Exp $	*/
      2 
      3 /* @(#)w_acos.c 5.1 93/09/24 */
      4 /*
      5  * ====================================================
      6  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
      7  *
      8  * Developed at SunPro, a Sun Microsystems, Inc. business.
      9  * Permission to use, copy, modify, and distribute this
     10  * software is freely granted, provided that this notice
     11  * is preserved.
     12  * ====================================================
     13  */
     14 
     15 #include <sys/cdefs.h>
     16 #if defined(LIBM_SCCS) && !defined(lint)
     17 __RCSID("$NetBSD: w_acos.c,v 1.11 2024/06/09 13:35:38 riastradh Exp $");
     18 #endif
     19 
     20 /*
     21  * wrap_acos(x)
     22  */
     23 
     24 #include "namespace.h"
     25 
     26 #include "math.h"
     27 #include "math_private.h"
     28 
     29 #ifndef __HAVE_LONG_DOUBLE
     30 __weak_alias(acosl, _acosl)
     31 __strong_alias(_acosl, _acos)
     32 #endif
     33 
     34 __weak_alias(acos, _acos)
     35 
     36 double
     37 acos(double x)		/* wrapper acos */
     38 {
     39 #ifdef _IEEE_LIBM
     40 	return __ieee754_acos(x);
     41 #else
     42 	double z;
     43 	z = __ieee754_acos(x);
     44 	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
     45 	if(fabs(x)>1.0) {
     46 	        return __kernel_standard(x,x,1); /* acos(|x|>1) */
     47 	} else
     48 	    return z;
     49 #endif
     50 }
     51