1 files changed, 97 insertions, 0 deletions
diff --git a/410user/libRNG/mt19937int.c b/410user/libRNG/mt19937int.c
new file mode 100644
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+++ b/410user/libRNG/mt19937int.c
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+/* A C-program for MT19937: Integer     version                   */
+/*  genrand() generates one pseudorandom unsigned integer (32bit) */
+/* which is uniformly distributed among 0 to 2^32-1  for each     */
+/* call. sgenrand(seed) set initial values to the working area    */
+/* of 624 words. Before genrand(), sgenrand(seed) must be         */
+/* called once. (seed is any 32-bit integer except for 0).        */
+/*   Coded by Takuji Nishimura, considering the suggestions by    */
+/* Topher Cooper and Marc Rieffel in July-Aug. 1997.              */
+
+/* This library is free software; you can redistribute it and/or   */
+/* modify it under the terms of the GNU Library General Public     */
+/* License as published by the Free Software Foundation; either    */
+/* version 2 of the License, or (at your option) any later         */
+/* version.                                                        */
+/* This library is distributed in the hope that it will be useful, */
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of  */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.            */
+/* See the GNU Library General Public License for more details.    */
+/* You should have received a copy of the GNU Library General      */
+/* Public License along with this library; if not, write to the    */
+/* Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   */ 
+/* 02111-1307  USA                                                 */
+
+/* Copyright (C) 1997 Makoto Matsumoto and Takuji Nishimura.       */
+/* Any feedback is very welcome. For any question, comments,       */
+/* see http://www.math.keio.ac.jp/matumoto/emt.html or email       */
+/* matumoto@math.keio.ac.jp                                        */
+
+/* modified for 15-410 at CMU by Zachary Anderson(zra) */
+
+/* Period parameters */  
+#define N 624
+#define M 397
+#define MATRIX_A 0x9908b0df   /* constant vector a */
+#define UPPER_MASK 0x80000000 /* most significant w-r bits */
+#define LOWER_MASK 0x7fffffff /* least significant r bits */
+
+/* Tempering parameters */   
+#define TEMPERING_MASK_B 0x9d2c5680
+#define TEMPERING_MASK_C 0xefc60000
+#define TEMPERING_SHIFT_U(y)  (y >> 11)
+#define TEMPERING_SHIFT_S(y)  (y << 7)
+#define TEMPERING_SHIFT_T(y)  (y << 15)
+#define TEMPERING_SHIFT_L(y)  (y >> 18)
+
+static unsigned long mt[N]; /* the array for the state vector  */
+static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
+
+/* initializing the array with a NONZERO seed */
+void
+sgenrand(seed)
+unsigned long seed;	
+{
+    /* setting initial seeds to mt[N] using         */
+    /* the generator Line 25 of Table 1 in          */
+    /* [KNUTH 1981, The Art of Computer Programming */
+    /*    Vol. 2 (2nd Ed.), pp102]                  */
+    mt[0]= seed & 0xffffffff;
+    for (mti=1; mti<N; mti++)
+        mt[mti] = (69069 * mt[mti-1]) & 0xffffffff;
+}
+
+unsigned long 
+genrand()
+{
+    unsigned long y;
+    static unsigned long mag01[2]={0x0, MATRIX_A};
+    /* mag01[x] = x * MATRIX_A  for x=0,1 */
+
+    if (mti >= N) { /* generate N words at one time */
+        int kk;
+
+        if (mti == N+1)   /* if sgenrand() has not been called, */
+            sgenrand(4357); /* a default initial seed is used   */
+
+        for (kk=0;kk<N-M;kk++) {
+            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+            mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1];
+        }
+        for (;kk<N-1;kk++) {
+            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+            mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1];
+        }
+        y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
+        mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1];
+
+        mti = 0;
+    }
+  
+    y = mt[mti++];
+    y ^= TEMPERING_SHIFT_U(y);
+    y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B;
+    y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C;
+    y ^= TEMPERING_SHIFT_L(y);
+
+    return y; 
+}