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      1  1.3  joerg /*	$NetBSD: fabs_ieee754.c,v 1.3 2013/11/29 22:15:26 joerg Exp $	*/
      2  1.2   matt 
      3  1.2   matt /*-
      4  1.2   matt  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  1.2   matt  * All rights reserved.
      6  1.2   matt  *
      7  1.2   matt  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2   matt  * by Klaus Klein.
      9  1.2   matt  *
     10  1.2   matt  * Redistribution and use in source and binary forms, with or without
     11  1.2   matt  * modification, are permitted provided that the following conditions
     12  1.2   matt  * are met:
     13  1.2   matt  * 1. Redistributions of source code must retain the above copyright
     14  1.2   matt  *    notice, this list of conditions and the following disclaimer.
     15  1.2   matt  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2   matt  *    notice, this list of conditions and the following disclaimer in the
     17  1.2   matt  *    documentation and/or other materials provided with the distribution.
     18  1.2   matt  *
     19  1.2   matt  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2   matt  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2   matt  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2   matt  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2   matt  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2   matt  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2   matt  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2   matt  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2   matt  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2   matt  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2   matt  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2   matt  */
     31  1.2   matt 
     32  1.2   matt #include <sys/cdefs.h>
     33  1.2   matt #if defined(LIBC_SCCS) && !defined(lint)
     34  1.3  joerg __RCSID("$NetBSD: fabs_ieee754.c,v 1.3 2013/11/29 22:15:26 joerg Exp $");
     35  1.2   matt #endif
     36  1.2   matt 
     37  1.2   matt #include <machine/ieee.h>
     38  1.2   matt #include <math.h>
     39  1.2   matt 
     40  1.2   matt /*
     41  1.2   matt  * 7.12.3.6 fabs - return the absolute value of the argument
     42  1.2   matt  *          IEEE 754 double-precision version
     43  1.2   matt  */
     44  1.3  joerg #ifndef __HAVE_LONG_DOUBLE
     45  1.3  joerg __strong_alias(fabsl, fabs)
     46  1.3  joerg #endif
     47  1.3  joerg 
     48  1.2   matt double
     49  1.2   matt fabs(double x)
     50  1.2   matt {
     51  1.2   matt 	union ieee_double_u u;
     52  1.2   matt 
     53  1.2   matt 	u.dblu_d = x;
     54  1.2   matt 
     55  1.2   matt 	u.dblu_dbl.dbl_sign = 0;
     56  1.2   matt 
     57  1.2   matt 	return u.dblu_d;
     58  1.2   matt }
     59