Adding gem5 source to svn.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1819 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

simulators/gem5/src/base/intmath.hh

@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2001, 2003-2005 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.
+ *
+ * Authors: Nathan Binkert
+ */
+
+#ifndef __BASE_INTMATH_HH__
+#define __BASE_INTMATH_HH__
+
+#include <cassert>
+
+#include "base/misc.hh"
+#include "base/types.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 uint64_t
+power(uint32_t n, uint32_t e)
+{
+    if (e > 20)
+        warn("Warning, power() function is quite slow for large exponents\n");
+
+    if (e == 0)
+        return 1;
+
+    uint64_t result = n;
+    uint64_t old_result = 0;
+    for (int x = 1; x < e; x++) {
+        old_result = result;
+        result *= n;
+        if (old_result > result)
+            warn("power() overflowed!\n");
+    }
+    return result;
+}
+
+
+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);
+}
+
+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, int align)
+{
+    T mask = (T)align - 1;
+    return (val + mask) & ~mask;
+}
+
+template <class T>
+inline T
+roundDown(T val, int align)
+{
+    T mask = (T)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 // __BASE_INTMATH_HH__