Annotation of sys/lib/libkern/quad.h, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 1992, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * This software was developed by the Computer Systems Engineering group
! 6: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 7: * contributed to Berkeley.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: *
! 33: * $OpenBSD: quad.h,v 1.9 2004/11/28 07:23:41 mickey Exp $
! 34: */
! 35:
! 36: /*
! 37: * Quad arithmetic.
! 38: *
! 39: * This library makes the following assumptions:
! 40: *
! 41: * - The type long long (aka quad_t) exists.
! 42: *
! 43: * - A quad variable is exactly twice as long as `int'.
! 44: *
! 45: * - The machine's arithmetic is two's complement.
! 46: *
! 47: * This library can provide 128-bit arithmetic on a machine with 128-bit
! 48: * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
! 49: * with 48-bit ints.
! 50: */
! 51:
! 52: #include <sys/types.h>
! 53: #if !defined(_KERNEL) && !defined(_STANDALONE)
! 54: #include <limits.h>
! 55: #else
! 56: #include <sys/limits.h>
! 57: #endif
! 58:
! 59: /*
! 60: * Depending on the desired operation, we view a `long long' (aka quad_t) in
! 61: * one or more of the following formats.
! 62: */
! 63: union uu {
! 64: quad_t q; /* as a (signed) quad */
! 65: u_quad_t uq; /* as an unsigned quad */
! 66: int sl[2]; /* as two signed ints */
! 67: u_int ul[2]; /* as two unsigned ints */
! 68: };
! 69:
! 70: /*
! 71: * Define high and low parts of a quad_t.
! 72: */
! 73: #define H _QUAD_HIGHWORD
! 74: #define L _QUAD_LOWWORD
! 75:
! 76: /*
! 77: * Total number of bits in a quad_t and in the pieces that make it up.
! 78: * These are used for shifting, and also below for halfword extraction
! 79: * and assembly.
! 80: */
! 81: #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
! 82: #define INT_BITS (sizeof(int) * CHAR_BIT)
! 83: #define HALF_BITS (sizeof(int) * CHAR_BIT / 2)
! 84:
! 85: /*
! 86: * Extract high and low shortwords from longword, and move low shortword of
! 87: * longword to upper half of long, i.e., produce the upper longword of
! 88: * ((quad_t)(x) << (number_of_bits_in_int/2)). (`x' must actually be u_int.)
! 89: *
! 90: * These are used in the multiply code, to split a longword into upper
! 91: * and lower halves, and to reassemble a product as a quad_t, shifted left
! 92: * (sizeof(int)*CHAR_BIT/2).
! 93: */
! 94: #define HHALF(x) ((u_int)(x) >> HALF_BITS)
! 95: #define LHALF(x) ((u_int)(x) & (((int)1 << HALF_BITS) - 1))
! 96: #define LHUP(x) ((u_int)(x) << HALF_BITS)
! 97:
! 98: /*
! 99: * XXX
! 100: * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
! 101: * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
! 102: * both compilers.
! 103: */
! 104: #if __GNUC_PREREQ__(2, 0) || defined(lint)
! 105: typedef unsigned int qshift_t;
! 106: #else
! 107: typedef u_quad_t qshift_t;
! 108: #endif
! 109:
! 110: quad_t __adddi3(quad_t, quad_t);
! 111: quad_t __anddi3(quad_t, quad_t);
! 112: quad_t __ashldi3(quad_t, qshift_t);
! 113: quad_t __ashrdi3(quad_t, qshift_t);
! 114: int __cmpdi2(quad_t, quad_t);
! 115: quad_t __divdi3(quad_t, quad_t);
! 116: quad_t __fixdfdi(double);
! 117: quad_t __fixsfdi(float);
! 118: u_quad_t __fixunsdfdi(double);
! 119: u_quad_t __fixunssfdi(float);
! 120: double __floatdidf(quad_t);
! 121: float __floatdisf(quad_t);
! 122: double __floatunsdidf(u_quad_t);
! 123: quad_t __iordi3(quad_t, quad_t);
! 124: quad_t __lshldi3(quad_t, qshift_t);
! 125: quad_t __lshrdi3(quad_t, qshift_t);
! 126: quad_t __moddi3(quad_t, quad_t);
! 127: quad_t __muldi3(quad_t, quad_t);
! 128: quad_t __negdi2(quad_t);
! 129: quad_t __one_cmpldi2(quad_t);
! 130: u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *);
! 131: quad_t __subdi3(quad_t, quad_t);
! 132: int __ucmpdi2(u_quad_t, u_quad_t);
! 133: u_quad_t __udivdi3(u_quad_t, u_quad_t );
! 134: u_quad_t __umoddi3(u_quad_t, u_quad_t );
! 135: quad_t __xordi3(quad_t, quad_t);
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