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ldexp_881.c revision 1.1.6.2 
      1  1.1.6.2  yamt /*	$NetBSD: ldexp_881.c,v 1.1.6.2 2014/05/22 11:36:47 yamt Exp $	*/
      2  1.1.6.2  yamt 
      3  1.1.6.2  yamt /*-
      4  1.1.6.2  yamt  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  1.1.6.2  yamt  * All rights reserved.
      6  1.1.6.2  yamt  *
      7  1.1.6.2  yamt  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1.6.2  yamt  * by Charles M. Hannum.
      9  1.1.6.2  yamt  *
     10  1.1.6.2  yamt  * Redistribution and use in source and binary forms, with or without
     11  1.1.6.2  yamt  * modification, are permitted provided that the following conditions
     12  1.1.6.2  yamt  * are met:
     13  1.1.6.2  yamt  * 1. Redistributions of source code must retain the above copyright
     14  1.1.6.2  yamt  *    notice, this list of conditions and the following disclaimer.
     15  1.1.6.2  yamt  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1.6.2  yamt  *    notice, this list of conditions and the following disclaimer in the
     17  1.1.6.2  yamt  *    documentation and/or other materials provided with the distribution.
     18  1.1.6.2  yamt  *
     19  1.1.6.2  yamt  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1.6.2  yamt  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1.6.2  yamt  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1.6.2  yamt  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1.6.2  yamt  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1.6.2  yamt  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1.6.2  yamt  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1.6.2  yamt  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1.6.2  yamt  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1.6.2  yamt  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1.6.2  yamt  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1.6.2  yamt  */
     31  1.1.6.2  yamt 
     32  1.1.6.2  yamt #include <sys/cdefs.h>
     33  1.1.6.2  yamt #if defined(LIBC_SCCS) && !defined(lint)
     34  1.1.6.2  yamt __RCSID("$NetBSD: ldexp_881.c,v 1.1.6.2 2014/05/22 11:36:47 yamt Exp $");
     35  1.1.6.2  yamt #endif /* LIBC_SCCS and not lint */
     36  1.1.6.2  yamt 
     37  1.1.6.2  yamt #include <sys/types.h>
     38  1.1.6.2  yamt #include <machine/ieee.h>
     39  1.1.6.2  yamt #include <math.h>
     40  1.1.6.2  yamt 
     41  1.1.6.2  yamt /*
     42  1.1.6.2  yamt  * ldexp(value, exp): return value * (2 ** exp).
     43  1.1.6.2  yamt  */
     44  1.1.6.2  yamt double
     45  1.1.6.2  yamt ldexp(value, exp2)
     46  1.1.6.2  yamt 	double value;
     47  1.1.6.2  yamt 	int exp2;
     48  1.1.6.2  yamt {
     49  1.1.6.2  yamt 	double temp;
     50  1.1.6.2  yamt 
     51  1.1.6.2  yamt 	__asm ("fscalel %2,%1"
     52  1.1.6.2  yamt 		: "=f" (temp)
     53  1.1.6.2  yamt 		: "0" (value), "g" (exp2));
     54  1.1.6.2  yamt 	return (temp);
     55  1.1.6.2  yamt }
     56