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404 lines
12 KiB
C
404 lines
12 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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** File: prlong.h
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** Description: Portable access to 64 bit numerics
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**
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** Long-long (64-bit signed integer type) support. Some C compilers
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** don't support 64 bit integers yet, so we use these macros to
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** support both machines that do and don't.
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**/
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#ifndef prlong_h___
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#define prlong_h___
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/***********************************************************************
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** DEFINES: LL_MaxInt
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** LL_MinInt
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** LL_Zero
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** LL_MaxUint
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** DESCRIPTION:
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** Various interesting constants and static variable
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** initializer
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***********************************************************************/
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NSPR_API(PRInt64) LL_MaxInt(void);
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NSPR_API(PRInt64) LL_MinInt(void);
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NSPR_API(PRInt64) LL_Zero(void);
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NSPR_API(PRUint64) LL_MaxUint(void);
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#if defined(HAVE_LONG_LONG)
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/* Keep this in sync with prtypes.h. */
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#if PR_BYTES_PER_LONG == 8 && !defined(PR_ALTERNATE_INT64_TYPEDEF)
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#define LL_MAXINT 9223372036854775807L
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#define LL_MININT (-LL_MAXINT - 1L)
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#define LL_ZERO 0L
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#define LL_MAXUINT 18446744073709551615UL
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#define LL_INIT(hi, lo) ((hi ## L << 32) + lo ## L)
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#elif defined(WIN32) && !defined(__GNUC__)
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#define LL_MAXINT 9223372036854775807i64
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#define LL_MININT (-LL_MAXINT - 1i64)
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#define LL_ZERO 0i64
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#define LL_MAXUINT 18446744073709551615ui64
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#define LL_INIT(hi, lo) ((hi ## i64 << 32) + lo ## i64)
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#else
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#define LL_MAXINT 9223372036854775807LL
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#define LL_MININT (-LL_MAXINT - 1LL)
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#define LL_ZERO 0LL
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#define LL_MAXUINT 18446744073709551615ULL
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#define LL_INIT(hi, lo) ((hi ## LL << 32) + lo ## LL)
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#endif
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/***********************************************************************
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** MACROS: LL_*
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** DESCRIPTION:
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** The following macros define portable access to the 64 bit
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** math facilities.
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**
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***********************************************************************/
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/***********************************************************************
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** MACROS: LL_<relational operators>
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**
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** LL_IS_ZERO Test for zero
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** LL_EQ Test for equality
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** LL_NE Test for inequality
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** LL_GE_ZERO Test for zero or positive
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** LL_CMP Compare two values
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***********************************************************************/
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#define LL_IS_ZERO(a) ((a) == 0)
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#define LL_EQ(a, b) ((a) == (b))
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#define LL_NE(a, b) ((a) != (b))
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#define LL_GE_ZERO(a) ((a) >= 0)
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#define LL_CMP(a, op, b) ((PRInt64)(a) op (PRInt64)(b))
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#define LL_UCMP(a, op, b) ((PRUint64)(a) op (PRUint64)(b))
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/***********************************************************************
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** MACROS: LL_<logical operators>
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**
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** LL_AND Logical and
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** LL_OR Logical or
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** LL_XOR Logical exclusion
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** LL_OR2 A disgusting deviation
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** LL_NOT Negation (one's complement)
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***********************************************************************/
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#define LL_AND(r, a, b) ((r) = (a) & (b))
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#define LL_OR(r, a, b) ((r) = (a) | (b))
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#define LL_XOR(r, a, b) ((r) = (a) ^ (b))
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#define LL_OR2(r, a) ((r) = (r) | (a))
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#define LL_NOT(r, a) ((r) = ~(a))
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/***********************************************************************
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** MACROS: LL_<mathematical operators>
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**
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** LL_NEG Negation (two's complement)
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** LL_ADD Summation (two's complement)
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** LL_SUB Difference (two's complement)
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***********************************************************************/
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#define LL_NEG(r, a) ((r) = -(a))
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#define LL_ADD(r, a, b) ((r) = (a) + (b))
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#define LL_SUB(r, a, b) ((r) = (a) - (b))
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/***********************************************************************
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** MACROS: LL_<mathematical operators>
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**
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** LL_MUL Product (two's complement)
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** LL_DIV Quotient (two's complement)
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** LL_MOD Modulus (two's complement)
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***********************************************************************/
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#define LL_MUL(r, a, b) ((r) = (a) * (b))
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#define LL_DIV(r, a, b) ((r) = (a) / (b))
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#define LL_MOD(r, a, b) ((r) = (a) % (b))
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/***********************************************************************
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** MACROS: LL_<shifting operators>
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**
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** LL_SHL Shift left [0..64] bits
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** LL_SHR Shift right [0..64] bits with sign extension
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** LL_USHR Unsigned shift right [0..64] bits
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** LL_ISHL Signed shift left [0..64] bits
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***********************************************************************/
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#define LL_SHL(r, a, b) ((r) = (PRInt64)(a) << (b))
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#define LL_SHR(r, a, b) ((r) = (PRInt64)(a) >> (b))
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#define LL_USHR(r, a, b) ((r) = (PRUint64)(a) >> (b))
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#define LL_ISHL(r, a, b) ((r) = (PRInt64)(a) << (b))
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/***********************************************************************
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** MACROS: LL_<conversion operators>
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**
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** LL_L2I Convert to signed 32 bit
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** LL_L2UI Convert to unsigned 32 bit
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** LL_L2F Convert to floating point
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** LL_L2D Convert to floating point
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** LL_I2L Convert signed to 64 bit
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** LL_UI2L Convert unsigned to 64 bit
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** LL_F2L Convert float to 64 bit
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** LL_D2L Convert float to 64 bit
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***********************************************************************/
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#define LL_L2I(i, l) ((i) = (PRInt32)(l))
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#define LL_L2UI(ui, l) ((ui) = (PRUint32)(l))
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#define LL_L2F(f, l) ((f) = (PRFloat64)(l))
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#define LL_L2D(d, l) ((d) = (PRFloat64)(l))
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#define LL_I2L(l, i) ((l) = (PRInt64)(i))
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#define LL_UI2L(l, ui) ((l) = (PRInt64)(ui))
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#define LL_F2L(l, f) ((l) = (PRInt64)(f))
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#define LL_D2L(l, d) ((l) = (PRInt64)(d))
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/***********************************************************************
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** MACROS: LL_UDIVMOD
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** DESCRIPTION:
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** Produce both a quotient and a remainder given an unsigned
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** INPUTS: PRUint64 a: The dividend of the operation
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** PRUint64 b: The quotient of the operation
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** OUTPUTS: PRUint64 *qp: pointer to quotient
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** PRUint64 *rp: pointer to remainder
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***********************************************************************/
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#define LL_UDIVMOD(qp, rp, a, b) \
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(*(qp) = ((PRUint64)(a) / (b)), \
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*(rp) = ((PRUint64)(a) % (b)))
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#else /* !HAVE_LONG_LONG */
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#define LL_MAXINT LL_MaxInt()
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#define LL_MININT LL_MinInt()
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#define LL_ZERO LL_Zero()
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#define LL_MAXUINT LL_MaxUint()
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#ifdef IS_LITTLE_ENDIAN
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#define LL_INIT(hi, lo) {PR_UINT32(lo), PR_UINT32(hi)}
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#else
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#define LL_INIT(hi, lo) {PR_UINT32(hi), PR_UINT32(lo)}
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#endif
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#define LL_IS_ZERO(a) (((a).hi == 0) && ((a).lo == 0))
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#define LL_EQ(a, b) (((a).hi == (b).hi) && ((a).lo == (b).lo))
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#define LL_NE(a, b) (((a).hi != (b).hi) || ((a).lo != (b).lo))
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#define LL_GE_ZERO(a) (((a).hi >> 31) == 0)
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#define LL_CMP(a, op, b) (((a).hi == (b).hi) ? ((a).lo op (b).lo) : \
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((PRInt32)(a).hi op (PRInt32)(b).hi))
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#define LL_UCMP(a, op, b) (((a).hi == (b).hi) ? ((a).lo op (b).lo) : \
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((a).hi op (b).hi))
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#define LL_AND(r, a, b) ((r).lo = (a).lo & (b).lo, \
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(r).hi = (a).hi & (b).hi)
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#define LL_OR(r, a, b) ((r).lo = (a).lo | (b).lo, \
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(r).hi = (a).hi | (b).hi)
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#define LL_XOR(r, a, b) ((r).lo = (a).lo ^ (b).lo, \
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(r).hi = (a).hi ^ (b).hi)
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#define LL_OR2(r, a) ((r).lo = (r).lo | (a).lo, \
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(r).hi = (r).hi | (a).hi)
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#define LL_NOT(r, a) ((r).lo = ~(a).lo, \
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(r).hi = ~(a).hi)
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#define LL_NEG(r, a) ((r).lo = -(PRInt32)(a).lo, \
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(r).hi = -(PRInt32)(a).hi - ((r).lo != 0))
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#define LL_ADD(r, a, b) { \
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PRInt64 _a, _b; \
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_a = a; _b = b; \
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(r).lo = _a.lo + _b.lo; \
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(r).hi = _a.hi + _b.hi + ((r).lo < _b.lo); \
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}
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#define LL_SUB(r, a, b) { \
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PRInt64 _a, _b; \
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_a = a; _b = b; \
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(r).lo = _a.lo - _b.lo; \
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(r).hi = _a.hi - _b.hi - (_a.lo < _b.lo); \
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}
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#define LL_MUL(r, a, b) { \
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PRInt64 _a, _b; \
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_a = a; _b = b; \
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LL_MUL32(r, _a.lo, _b.lo); \
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(r).hi += _a.hi * _b.lo + _a.lo * _b.hi; \
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}
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#define _lo16(a) ((a) & PR_BITMASK(16))
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#define _hi16(a) ((a) >> 16)
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#define LL_MUL32(r, a, b) { \
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PRUint32 _a1, _a0, _b1, _b0, _y0, _y1, _y2, _y3; \
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_a1 = _hi16(a), _a0 = _lo16(a); \
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_b1 = _hi16(b), _b0 = _lo16(b); \
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_y0 = _a0 * _b0; \
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_y1 = _a0 * _b1; \
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_y2 = _a1 * _b0; \
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_y3 = _a1 * _b1; \
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_y1 += _hi16(_y0); /* can't carry */ \
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_y1 += _y2; /* might carry */ \
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if (_y1 < _y2) \
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_y3 += (PRUint32)(PR_BIT(16)); /* propagate */ \
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(r).lo = (_lo16(_y1) << 16) + _lo16(_y0); \
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(r).hi = _y3 + _hi16(_y1); \
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}
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#define LL_UDIVMOD(qp, rp, a, b) ll_udivmod(qp, rp, a, b)
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NSPR_API(void) ll_udivmod(PRUint64 *qp, PRUint64 *rp, PRUint64 a, PRUint64 b);
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#define LL_DIV(r, a, b) { \
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PRInt64 _a, _b; \
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PRUint32 _negative = (PRInt32)(a).hi < 0; \
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if (_negative) { \
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LL_NEG(_a, a); \
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} else { \
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_a = a; \
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} \
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if ((PRInt32)(b).hi < 0) { \
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_negative ^= 1; \
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LL_NEG(_b, b); \
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} else { \
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_b = b; \
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} \
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LL_UDIVMOD(&(r), 0, _a, _b); \
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if (_negative) \
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LL_NEG(r, r); \
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}
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#define LL_MOD(r, a, b) { \
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PRInt64 _a, _b; \
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PRUint32 _negative = (PRInt32)(a).hi < 0; \
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if (_negative) { \
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LL_NEG(_a, a); \
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} else { \
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_a = a; \
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} \
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if ((PRInt32)(b).hi < 0) { \
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LL_NEG(_b, b); \
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} else { \
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_b = b; \
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} \
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LL_UDIVMOD(0, &(r), _a, _b); \
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if (_negative) \
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LL_NEG(r, r); \
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}
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#define LL_SHL(r, a, b) { \
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if (b) { \
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PRInt64 _a; \
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_a = a; \
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if ((b) < 32) { \
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(r).lo = _a.lo << ((b) & 31); \
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(r).hi = (_a.hi << ((b) & 31)) | (_a.lo >> (32 - (b))); \
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} else { \
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(r).lo = 0; \
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(r).hi = _a.lo << ((b) & 31); \
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} \
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} else { \
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(r) = (a); \
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} \
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}
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/* a is an PRInt32, b is PRInt32, r is PRInt64 */
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#define LL_ISHL(r, a, b) { \
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if (b) { \
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PRInt64 _a; \
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_a.lo = (a); \
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_a.hi = 0; \
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if ((b) < 32) { \
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(r).lo = (a) << ((b) & 31); \
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(r).hi = ((a) >> (32 - (b))); \
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} else { \
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(r).lo = 0; \
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(r).hi = (a) << ((b) & 31); \
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} \
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} else { \
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(r).lo = (a); \
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(r).hi = 0; \
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} \
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}
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#define LL_SHR(r, a, b) { \
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if (b) { \
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PRInt64 _a; \
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_a = a; \
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if ((b) < 32) { \
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(r).lo = (_a.hi << (32 - (b))) | (_a.lo >> ((b) & 31)); \
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(r).hi = (PRInt32)_a.hi >> ((b) & 31); \
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} else { \
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(r).lo = (PRInt32)_a.hi >> ((b) & 31); \
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(r).hi = (PRInt32)_a.hi >> 31; \
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} \
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} else { \
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(r) = (a); \
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} \
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}
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#define LL_USHR(r, a, b) { \
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if (b) { \
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PRInt64 _a; \
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_a = a; \
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if ((b) < 32) { \
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(r).lo = (_a.hi << (32 - (b))) | (_a.lo >> ((b) & 31)); \
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(r).hi = _a.hi >> ((b) & 31); \
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} else { \
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(r).lo = _a.hi >> ((b) & 31); \
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(r).hi = 0; \
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} \
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} else { \
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(r) = (a); \
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} \
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}
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#define LL_L2I(i, l) ((i) = (l).lo)
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#define LL_L2UI(ui, l) ((ui) = (l).lo)
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#define LL_L2F(f, l) { double _d; LL_L2D(_d, l); (f) = (PRFloat64)_d; }
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#define LL_L2D(d, l) { \
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int _negative; \
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PRInt64 _absval; \
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\
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_negative = (l).hi >> 31; \
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if (_negative) { \
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LL_NEG(_absval, l); \
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} else { \
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_absval = l; \
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} \
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(d) = (double)_absval.hi * 4.294967296e9 + _absval.lo; \
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if (_negative) \
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(d) = -(d); \
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}
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#define LL_I2L(l, i) { PRInt32 _i = ((PRInt32)(i)) >> 31; (l).lo = (i); (l).hi = _i; }
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#define LL_UI2L(l, ui) ((l).lo = (ui), (l).hi = 0)
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#define LL_F2L(l, f) { double _d = (double)f; LL_D2L(l, _d); }
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#define LL_D2L(l, d) { \
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int _negative; \
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double _absval, _d_hi; \
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PRInt64 _lo_d; \
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\
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_negative = ((d) < 0); \
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_absval = _negative ? -(d) : (d); \
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\
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(l).hi = _absval / 4.294967296e9; \
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(l).lo = 0; \
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LL_L2D(_d_hi, l); \
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_absval -= _d_hi; \
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_lo_d.hi = 0; \
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if (_absval < 0) { \
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_lo_d.lo = -_absval; \
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LL_SUB(l, l, _lo_d); \
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} else { \
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_lo_d.lo = _absval; \
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LL_ADD(l, l, _lo_d); \
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} \
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\
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if (_negative) \
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LL_NEG(l, l); \
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}
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#endif /* !HAVE_LONG_LONG */
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PR_END_EXTERN_C
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#endif /* prlong_h___ */
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