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root/jsr166/jsr166/src/loops/LoopHelpers.java
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Comparing jsr166/src/loops/LoopHelpers.java (file contents):
Revision 1.1 by jsr166, Fri Apr 9 20:12:06 2004 UTC vs.
Revision 1.4 by jsr166, Fri Jan 18 04:23:28 2013 UTC

# Line 12 | Line 12 | class LoopHelpers {
12      // Some mindless computation to do between synchronizations...
13  
14      /**
15 <     * generates 32 bit pseudo-random numbers.
15 >     * generates 32 bit pseudo-random numbers.
16       * Adapted from http://www.snippets.org
17       */
18 <    public static int compute1(int x) {
18 >    public static int compute1(int x) {
19          int lo = 16807 * (x & 0xFFFF);
20          int hi = 16807 * (x >>> 16);
21          lo += (hi & 0x7FFF) << 16;
# Line 35 | Line 35 | class LoopHelpers {
35       *  Computes a linear congruential random number a random number
36       *  of times.
37       */
38 <    public static int compute2(int x) {
38 >    public static int compute2(int x) {
39          int loops = (x >>> 4) & 7;
40          while (loops-- > 0) {
41              x = (x * 2147483647) % 16807;
# Line 43 | Line 43 | class LoopHelpers {
43          return x;
44      }
45  
46 <    public static int compute3(int x) {
46 >    /**
47 >     * Yet another random number generator
48 >     */
49 >    public static int compute3(int x) {
50          int t = (x % 127773) * 16807 - (x / 127773) * 2836;
51 <        return (t > 0)? t : t + 0x7fffffff;
51 >        return (t > 0) ? t : t + 0x7fffffff;
52 >    }
53 >
54 >    /**
55 >     * Yet another random number generator
56 >     */
57 >    public static int compute4(int x) {
58 >        return x * 134775813 + 1;
59      }
60  
61      /**
# Line 53 | Line 63 | class LoopHelpers {
63       * Basically same as java.util.Random.
64       */
65      public static class SimpleRandom {
66 <        private final static long multiplier = 0x5DEECE66DL;
67 <        private final static long addend = 0xBL;
68 <        private final static long mask = (1L << 48) - 1;
66 >        private static final long multiplier = 0x5DEECE66DL;
67 >        private static final long addend = 0xBL;
68 >        private static final long mask = (1L << 48) - 1;
69          static final AtomicLong seq = new AtomicLong(1);
70          private long seed = System.nanoTime() + seq.getAndIncrement();
71  
# Line 99 | Line 109 | class LoopHelpers {
109          b.replace(b.length()-num.length(), b.length(), num);
110          return b.toString();
111      }
112 <  
112 >
113   }

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