Current Path : /sys/libkern/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/libkern/quad.h |
/*- * 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. * 4. 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 * $FreeBSD: release/9.1.0/sys/libkern/quad.h 176496 2008-02-23 22:40:05Z marcel $ */ #ifndef _LIBKERN_QUAD_H_ #define _LIBKERN_QUAD_H_ /* * 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 `long'. * * - 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 longs, for instance, or 96-bit arithmetic on machines * with 48-bit longs. */ #include <sys/cdefs.h> #include <sys/types.h> #include <sys/limits.h> #include <sys/syslimits.h> /* * 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 */ quad_t uq; /* as an unsigned quad */ long sl[2]; /* as two signed longs */ u_long ul[2]; /* as two unsigned longs */ }; /* * Define high and low longwords. */ #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 LONG_BITS (sizeof(long) * CHAR_BIT) #define HALF_BITS (sizeof(long) * 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_long/2)). (`x' must actually be u_long.) * * 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(long)*CHAR_BIT/2). */ #define HHALF(x) ((x) >> HALF_BITS) #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1)) #define LHUP(x) ((x) << HALF_BITS) typedef unsigned int qshift_t; quad_t __ashldi3(quad_t, qshift_t); quad_t __ashrdi3(quad_t, qshift_t); int __cmpdi2(quad_t a, quad_t b); quad_t __divdi3(quad_t a, quad_t b); quad_t __lshrdi3(quad_t, qshift_t); quad_t __moddi3(quad_t a, quad_t b); u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); u_quad_t __udivdi3(u_quad_t a, u_quad_t b); u_quad_t __umoddi3(u_quad_t a, u_quad_t b); int __ucmpdi2(u_quad_t a, u_quad_t b); #endif /* !_LIBKERN_QUAD_H_ */