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root/jsr166/jsr166/src/test/loops/LoopHelpers.java

Comparing jsr166/src/test/loops/LoopHelpers.java (file contents):
Revision 1.2 by dl, Mon May 9 19:33:30 2005 UTC vs.
Revision 1.3 by dl, Fri Jun 10 15:45:19 2005 UTC

#	Line 71 | Line 71 | class LoopHelpers {
71		return 36969 * (x & 65535) + (x >> 16);
72		}
73
74	+	/**
75	+	* Marsaglia xorshift (1, 3, 10)
76	+	*/
77	+	public static int compute6(int y) {
78	+	y ^= y << 1;
79	+	y ^= y >>> 3;
80	+	y ^= (y << 10);
81	+	return y;
82	+	}
83	+
84	+	/**
85	+	* Marsaglia xorshift (6, 21, 7)
86	+	*/
87	+	public static int compute7(int y) {
88	+	y ^= y << 6;
89	+	y ^= y >>> 21;
90	+	y ^= (y << 7);
91	+	return y;
92	+	}
93	+
94	+	public static final long compute8InitialValue = 88172645463325252L;
95	+
96	+	/**
97	+	* Marsaglia xorshift for longs
98	+	*/
99	+	public static long compute8(long x) {
100	+	x ^= x << 13;
101	+	x ^= x >>> 7;
102	+	x ^= (x << 17);
103	+	return x;
104	+	}
105	+
106	+
107	+	/** Multiplication-free RNG from Marsaglia "Xorshift RNGs" paper */
108	+	public static class MarsagliaRandom {
109	+	int x;
110	+	int y = 842502087;
111	+	int z = (int)(3579807591L & 0xffff);
112	+	int w = 273326509;
113	+	public MarsagliaRandom(int seed) { x = seed;  }
114	+	public MarsagliaRandom() { this((int)System.nanoTime()); }
115	+	public int next() {
116	+	int t = x ^ (x << 11);
117	+	x = y;
118	+	y = z;
119	+	z = w;
120	+	return w = (w ^ (w >>> 19)) ^ (t ^ (t >>> 8));
121	+	}
122	+	}
123
124		/**
125		* An actually useful random number generator, but unsynchronized.

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