8ed4f0a02c
--HG-- rename : src/dev/arm/Versatile.py => src/dev/arm/RealView.py rename : src/dev/arm/versatile.cc => src/dev/arm/realview.cc rename : src/dev/arm/versatile.hh => src/dev/arm/realview.hh
255 lines
5.3 KiB
C++
255 lines
5.3 KiB
C++
/*
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* Copyright (c) 2001, 2003-2005 The Regents of The University of Michigan
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* All rights reserved.
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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 are
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* met: 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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* 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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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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*/
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#ifndef __BASE_INTMATH_HH__
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#define __BASE_INTMATH_HH__
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#include <cassert>
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#include "base/misc.hh"
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#include "base/types.hh"
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// Returns the prime number one less than n.
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int prevPrime(int n);
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// Determine if a number is prime
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template <class T>
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inline bool
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isPrime(T n)
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{
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T i;
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if (n == 2 || n == 3)
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return true;
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// Don't try every odd number to prove if it is a prime.
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// Toggle between every 2nd and 4th number.
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// (This is because every 6th odd number is divisible by 3.)
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for (i = 5; i*i <= n; i += 6) {
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if (((n % i) == 0 ) || ((n % (i + 2)) == 0) ) {
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return false;
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}
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}
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return true;
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}
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template <class T>
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inline T
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leastSigBit(T n)
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{
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return n & ~(n - 1);
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}
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template <class T>
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inline bool
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isPowerOf2(T n)
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{
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return n != 0 && leastSigBit(n) == n;
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}
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inline uint64_t
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power(uint32_t n, uint32_t e)
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{
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if (e > 20)
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warn("Warning, power() function is quite slow for large exponents\n");
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if (e == 0)
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return 1;
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uint64_t result = n;
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uint64_t old_result = 0;
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for (int x = 1; x < e; x++) {
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old_result = result;
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result *= n;
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if (old_result > result)
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warn("power() overflowed!\n");
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}
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return result;
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}
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inline int
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floorLog2(unsigned x)
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{
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assert(x > 0);
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int y = 0;
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if (x & 0xffff0000) { y += 16; x >>= 16; }
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if (x & 0x0000ff00) { y += 8; x >>= 8; }
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if (x & 0x000000f0) { y += 4; x >>= 4; }
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if (x & 0x0000000c) { y += 2; x >>= 2; }
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if (x & 0x00000002) { y += 1; }
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return y;
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}
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inline int
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floorLog2(unsigned long x)
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{
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assert(x > 0);
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int y = 0;
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#if defined(__LP64__)
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if (x & ULL(0xffffffff00000000)) { y += 32; x >>= 32; }
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#endif
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if (x & 0xffff0000) { y += 16; x >>= 16; }
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if (x & 0x0000ff00) { y += 8; x >>= 8; }
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if (x & 0x000000f0) { y += 4; x >>= 4; }
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if (x & 0x0000000c) { y += 2; x >>= 2; }
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if (x & 0x00000002) { y += 1; }
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return y;
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}
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inline int
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floorLog2(unsigned long long x)
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{
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assert(x > 0);
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int y = 0;
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if (x & ULL(0xffffffff00000000)) { y += 32; x >>= 32; }
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if (x & ULL(0x00000000ffff0000)) { y += 16; x >>= 16; }
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if (x & ULL(0x000000000000ff00)) { y += 8; x >>= 8; }
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if (x & ULL(0x00000000000000f0)) { y += 4; x >>= 4; }
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if (x & ULL(0x000000000000000c)) { y += 2; x >>= 2; }
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if (x & ULL(0x0000000000000002)) { y += 1; }
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return y;
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}
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inline int
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floorLog2(int x)
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{
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assert(x > 0);
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return floorLog2((unsigned)x);
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}
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inline int
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floorLog2(long x)
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{
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assert(x > 0);
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return floorLog2((unsigned long)x);
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}
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inline int
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floorLog2(long long x)
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{
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assert(x > 0);
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return floorLog2((unsigned long long)x);
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}
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template <class T>
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inline int
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ceilLog2(T n)
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{
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if (n == 1)
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return 0;
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return floorLog2(n - (T)1) + 1;
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}
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template <class T>
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inline T
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floorPow2(T n)
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{
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return (T)1 << floorLog2(n);
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}
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template <class T>
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inline T
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ceilPow2(T n)
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{
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return (T)1 << ceilLog2(n);
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}
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template <class T>
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inline T
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divCeil(T a, T b)
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{
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return (a + b - 1) / b;
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}
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template <class T>
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inline T
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roundUp(T val, int align)
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{
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T mask = (T)align - 1;
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return (val + mask) & ~mask;
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}
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template <class T>
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inline T
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roundDown(T val, int align)
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{
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T mask = (T)align - 1;
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return val & ~mask;
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}
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inline bool
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isHex(char c)
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{
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return (c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'F') ||
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(c >= 'a' && c <= 'f');
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}
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inline bool
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isOct(char c)
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{
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return c >= '0' && c <= '7';
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}
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inline bool
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isDec(char c)
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{
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return c >= '0' && c <= '9';
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}
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inline int
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hex2Int(char c)
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{
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if (c >= '0' && c <= '9')
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return (c - '0');
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if (c >= 'A' && c <= 'F')
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return (c - 'A') + 10;
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if (c >= 'a' && c <= 'f')
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return (c - 'a') + 10;
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return 0;
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}
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#endif // __BASE_INTMATH_HH__
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