140 lines
4.9 KiB
C
140 lines
4.9 KiB
C
/* $NetBSD: quad.h,v 1.16 2003/08/07 16:32:10 agc Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)quad.h 8.1 (Berkeley) 6/4/93
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*/
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/*
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* Quad arithmetic.
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*
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* This library makes the following assumptions:
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*
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* - The type long long (aka quad_t) exists.
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*
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* - A quad variable is exactly twice as long as `int'.
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*
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* - The machine's arithmetic is two's complement.
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*
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* This library can provide 128-bit arithmetic on a machine with 128-bit
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* quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
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* with 48-bit ints.
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*/
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#include <sys/types.h>
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <limits.h>
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#else
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#include <machine/limits.h>
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#endif
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/*
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* Depending on the desired operation, we view a `long long' (aka quad_t) in
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* one or more of the following formats.
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*/
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union uu {
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quad_t q; /* as a (signed) quad */
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u_quad_t uq; /* as an unsigned quad */
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int sl[2]; /* as two signed ints */
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u_int ul[2]; /* as two unsigned ints */
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};
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/*
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* Define high and low parts of a quad_t.
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*/
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#define H _QUAD_HIGHWORD
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#define L _QUAD_LOWWORD
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/*
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* Total number of bits in a quad_t and in the pieces that make it up.
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* These are used for shifting, and also below for halfword extraction
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* and assembly.
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*/
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#define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
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#define INT_BITS (sizeof(int) * CHAR_BIT)
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#define HALF_BITS (sizeof(int) * CHAR_BIT / 2)
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/*
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* Extract high and low shortwords from longword, and move low shortword of
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* longword to upper half of long, i.e., produce the upper longword of
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* ((quad_t)(x) << (number_of_bits_in_int/2)). (`x' must actually be u_int.)
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*
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* These are used in the multiply code, to split a longword into upper
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* and lower halves, and to reassemble a product as a quad_t, shifted left
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* (sizeof(int)*CHAR_BIT/2).
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*/
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#define HHALF(x) ((u_int)(x) >> HALF_BITS)
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#define LHALF(x) ((u_int)(x) & (((int)1 << HALF_BITS) - 1))
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#define LHUP(x) ((u_int)(x) << HALF_BITS)
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/*
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* XXX
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* Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
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* as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
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* both compilers.
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*/
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#if __GNUC_PREREQ__(2, 0) || defined(lint)
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typedef unsigned int qshift_t;
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#else
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typedef u_quad_t qshift_t;
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#endif
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__BEGIN_DECLS
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quad_t __adddi3 __P((quad_t, quad_t));
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quad_t __anddi3 __P((quad_t, quad_t));
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quad_t __ashldi3 __P((quad_t, qshift_t));
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quad_t __ashrdi3 __P((quad_t, qshift_t));
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int __cmpdi2 __P((quad_t, quad_t ));
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quad_t __divdi3 __P((quad_t, quad_t));
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quad_t __fixdfdi __P((double));
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quad_t __fixsfdi __P((float));
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u_quad_t __fixunsdfdi __P((double));
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u_quad_t __fixunssfdi __P((float));
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double __floatdidf __P((quad_t));
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float __floatdisf __P((quad_t));
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double __floatunsdidf __P((u_quad_t));
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quad_t __iordi3 __P((quad_t, quad_t));
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quad_t __lshldi3 __P((quad_t, qshift_t));
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quad_t __lshrdi3 __P((quad_t, qshift_t));
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quad_t __moddi3 __P((quad_t, quad_t));
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quad_t __muldi3 __P((quad_t, quad_t));
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quad_t __negdi2 __P((quad_t));
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quad_t __one_cmpldi2 __P((quad_t));
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u_quad_t __qdivrem __P((u_quad_t, u_quad_t, u_quad_t *));
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quad_t __subdi3 __P((quad_t, quad_t));
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int __ucmpdi2 __P((u_quad_t, u_quad_t));
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u_quad_t __udivdi3 __P((u_quad_t, u_quad_t ));
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u_quad_t __umoddi3 __P((u_quad_t, u_quad_t ));
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quad_t __xordi3 __P((quad_t, quad_t));
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__END_DECLS
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