gem5/base/intmath.hh
Nathan Binkert 5a7ee2b495 Make code more portable and port to cygwin
arch/alpha/alpha_tru64_process.cc:
    getdirent isn't implemented by cygwin.  panic if this function is
    executed.  (It shouldn't be too much to emulate it using opendir,
    readdir, etc.)
arch/alpha/pseudo_inst.cc:
    Use lseek once and read instead pread.
base/intmath.hh:
    we want int, long, and long long variations of FloorLog2 instead
    of int32_t, int64_t.  Otherwise, we leave one out.
base/socket.cc:
    Fix define that seems to be for apple
sim/serialize.cc:
    don't use the intXX_t stuff, instead, use the real types
    so we're sure that we cover all of them.

--HG--
extra : convert_revision : 9fccaff583100b06bbaafd95a162c4e19beed59e
2005-04-22 13:12:03 -04:00

246 lines
5.1 KiB
C++

/*
* Copyright (c) 2001, 2003 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*/
#ifndef __INTMATH_HH__
#define __INTMATH_HH__
#include <assert.h>
#include "sim/host.hh"
// Returns the prime number one less than n.
int PrevPrime(int n);
// Determine if a number is prime
template <class T>
inline bool
IsPrime(T n)
{
T i;
if (n == 2 || n == 3)
return true;
// Don't try every odd number to prove if it is a prime.
// Toggle between every 2nd and 4th number.
// (This is because every 6th odd number is divisible by 3.)
for (i = 5; i*i <= n; i += 6) {
if (((n % i) == 0 ) || ((n % (i + 2)) == 0) ) {
return false;
}
}
return true;
}
template <class T>
inline T
LeastSigBit(T n)
{
return n & ~(n - 1);
}
template <class T>
inline bool
IsPowerOf2(T n)
{
return n != 0 && LeastSigBit(n) == n;
}
inline int
FloorLog2(unsigned x)
{
assert(x > 0);
int y = 0;
if (x & 0xffff0000) { y += 16; x >>= 16; }
if (x & 0x0000ff00) { y += 8; x >>= 8; }
if (x & 0x000000f0) { y += 4; x >>= 4; }
if (x & 0x0000000c) { y += 2; x >>= 2; }
if (x & 0x00000002) { y += 1; }
return y;
}
inline int
FloorLog2(unsigned long x)
{
assert(x > 0);
int y = 0;
#if defined(__LP64__)
if (x & ULL(0xffffffff00000000)) { y += 32; x >>= 32; }
#endif
if (x & 0xffff0000) { y += 16; x >>= 16; }
if (x & 0x0000ff00) { y += 8; x >>= 8; }
if (x & 0x000000f0) { y += 4; x >>= 4; }
if (x & 0x0000000c) { y += 2; x >>= 2; }
if (x & 0x00000002) { y += 1; }
return y;
}
inline int
FloorLog2(unsigned long long x)
{
assert(x > 0);
int y = 0;
if (x & ULL(0xffffffff00000000)) { y += 32; x >>= 32; }
if (x & ULL(0x00000000ffff0000)) { y += 16; x >>= 16; }
if (x & ULL(0x000000000000ff00)) { y += 8; x >>= 8; }
if (x & ULL(0x00000000000000f0)) { y += 4; x >>= 4; }
if (x & ULL(0x000000000000000c)) { y += 2; x >>= 2; }
if (x & ULL(0x0000000000000002)) { y += 1; }
return y;
}
inline int
FloorLog2(int x)
{
assert(x > 0);
return FloorLog2((unsigned)x);
}
inline int
FloorLog2(long x)
{
assert(x > 0);
return FloorLog2((unsigned long)x);
}
inline int
FloorLog2(long long x)
{
assert(x > 0);
return FloorLog2((unsigned long long)x);
}
#if defined(__APPLE__)
inline int
FloorLog2(size_t x)
{
assert(x > 0);
assert(sizeof(size_t) == 4 || sizeof(size_t) == 8);
// It's my hope that this is optimized away?
if (sizeof(size_t) == 4)
return FloorLog2((uint32_t)x);
else if (sizeof(size_t) == 8)
return FloorLog2((uint64_t)x);
}
#endif
template <class T>
inline int
CeilLog2(T n)
{
if (n == 1)
return 0;
return FloorLog2(n - (T)1) + 1;
}
template <class T>
inline T
FloorPow2(T n)
{
return (T)1 << FloorLog2(n);
}
template <class T>
inline T
CeilPow2(T n)
{
return (T)1 << CeilLog2(n);
}
template <class T>
inline T
DivCeil(T a, T b)
{
return (a + b - 1) / b;
}
template <class T>
inline T
RoundUp(T val, T align)
{
T mask = align - 1;
return (val + mask) & ~mask;
}
template <class T>
inline T
RoundDown(T val, T align)
{
T mask = align - 1;
return val & ~mask;
}
inline bool
IsHex(char c)
{
return c >= '0' && c <= '9' ||
c >= 'A' && c <= 'F' ||
c >= 'a' && c <= 'f';
}
inline bool
IsOct(char c)
{
return c >= '0' && c <= '7';
}
inline bool
IsDec(char c)
{
return c >= '0' && c <= '9';
}
inline int
Hex2Int(char c)
{
if (c >= '0' && c <= '9')
return (c - '0');
if (c >= 'A' && c <= 'F')
return (c - 'A') + 10;
if (c >= 'a' && c <= 'f')
return (c - 'a') + 10;
return 0;
}
#endif // __INTMATH_HH__