xref: /src/common/lib/libc/quad/quad.h

/*	$NetBSD: quad.h,v 1.5 2012/03/09 15:41:16 christos Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)quad.h	8.1 (Berkeley) 6/4/93
 */

/*
 * Quad arithmetic.
 *
 * This library makes the following assumptions:
 *
 *  - The type long long (aka quad_t) exists.
 *
 *  - A quad variable is exactly twice as long as `int'.
 *
 *  - The machine's arithmetic is two's complement.
 *
 * This library can provide 128-bit arithmetic on a machine with 128-bit
 * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
 * with 48-bit ints.
 */

#include <sys/types.h>
#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <limits.h>
#else
#include <machine/limits.h>
#endif

/*
 * Depending on the desired operation, we view a `long long' (aka quad_t) in
 * one or more of the following formats.
 */
union uu {
	quad_t	q;		/* as a (signed) quad */
	u_quad_t uq;		/* as an unsigned quad */
	int	sl[2];		/* as two signed ints */
	u_int	ul[2];		/* as two unsigned ints */
};

/*
 * Define high and low parts of a quad_t.
 */
#define	H		_QUAD_HIGHWORD
#define	L		_QUAD_LOWWORD

/*
 * Total number of bits in a quad_t and in the pieces that make it up.
 * These are used for shifting, and also below for halfword extraction
 * and assembly.
 */
#define	QUAD_BITS	(sizeof(quad_t) * CHAR_BIT)
#define	INT_BITS	(sizeof(int) * CHAR_BIT)
#define	HALF_BITS	(sizeof(int) * CHAR_BIT / 2)

/*
 * Extract high and low shortwords from longword, and move low shortword of
 * longword to upper half of long, i.e., produce the upper longword of
 * ((quad_t)(x) << (number_of_bits_in_int/2)).  (`x' must actually be u_int.)
 *
 * These are used in the multiply code, to split a longword into upper
 * and lower halves, and to reassemble a product as a quad_t, shifted left
 * (sizeof(int)*CHAR_BIT/2).
 */
#define	HHALF(x)	((u_int)(x) >> HALF_BITS)
#define	LHALF(x)	((u_int)(x) & (((int)1 << (u_int)HALF_BITS) - 1))
#define	LHUP(x)		((u_int)(x) << (u_int)HALF_BITS)

/*
 * XXX
 * Compensate for gcc 1 vs gcc 2.  Gcc 1 defines ?sh?di3's second argument
 * as u_quad_t, while gcc 2 correctly uses int.  Unfortunately, we still use
 * both compilers.
 */
#if __GNUC_PREREQ__(2, 0) || defined(lint)
typedef unsigned int	qshift_t;
#else
typedef u_quad_t	qshift_t;
#endif

__BEGIN_DECLS
quad_t __adddi3 __P((quad_t, quad_t));
quad_t __anddi3 __P((quad_t, quad_t));
quad_t __ashldi3 __P((quad_t, qshift_t));
quad_t __ashrdi3 __P((quad_t, qshift_t));
int __cmpdi2 __P((quad_t, quad_t));
quad_t __divdi3 __P((quad_t, quad_t));
quad_t __fixtfdi __P((long double));
quad_t __fixdfdi __P((double));
quad_t __fixsfdi __P((float));
u_quad_t __fixunstfdi __P((long double));
u_quad_t __fixunsdfdi __P((double));
u_quad_t __fixunssfdi __P((float));
long double __floatditf __P((quad_t));
double __floatdidf __P((quad_t));
float __floatdisf __P((quad_t));
long double __floatunditf __P((u_quad_t));
double __floatundidf __P((u_quad_t));
float __floatundisf __P((u_quad_t));
quad_t __iordi3 __P((quad_t, quad_t));
quad_t __lshldi3 __P((quad_t, qshift_t));
quad_t __lshrdi3 __P((quad_t, qshift_t));
quad_t __moddi3 __P((quad_t, quad_t));
quad_t __muldi3 __P((quad_t, quad_t));
quad_t __negdi2 __P((quad_t));
quad_t __one_cmpldi2 __P((quad_t));
u_quad_t __qdivrem __P((u_quad_t, u_quad_t, u_quad_t *));
quad_t __subdi3 __P((quad_t, quad_t));
int __ucmpdi2 __P((u_quad_t, u_quad_t));
u_quad_t __udivdi3 __P((u_quad_t, u_quad_t ));
u_quad_t __umoddi3 __P((u_quad_t, u_quad_t ));
quad_t __xordi3 __P((quad_t, quad_t));
__END_DECLS