Add pcg and xoshiro examples

examples/Makefile.am

@@ -2,5 +2,7 @@ exdir = ${prefix}/share/TestU01/examples
 
 ex_DATA = bat1.res bat2.res birth1.res ex3.res excel.dat vax.bin my16807.h \
    bat1.c bat2.c bat3.c birth1.c birth2.c ex1.c ex3.c ex4.c ex7.c \
-   fcoll.c fbirth.c scat.c scat2.c my16807.c mrg32k3a.c xorshift.c \
+   fcoll.c fbirth.c scat.c scat2.c my16807.c mrg32k3a.c pcg32.c speedpcg32.c \
+   speedxoshiro128plusplus.c testpcg32.c testxoshiro128plusplus.c \
+   xorshift.c xoshiro128plusplus.c \
    fbirth.res1.tex fbirth.res2.tex fcoll.res1.tex fcoll.res2.tex      

examples/pcg32.c

@@ -0,0 +1,27 @@
+#include "stdint.h"
+
+// This random number generation algorithm is taken from
+// M.E. O'Neil  "PCG: A Family of Simple Fast Space-Efficient"
+//              "Statistically Good Algorithms for Random Number" 
+//              "Generation"
+// https://www.cs.hmc.edu/tr/hmc-cs-2014-0905.pdf
+// https://www.pcg-random.org/download.html
+//
+// *Really* minimal PCG32 code
+// (c) 2014 M.E. O'Neill
+// pcg-random.org
+// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
+
+static uint64_t state = 5342;
+static uint64_t inc = 521;
+uint32_t pcg32_random_r(void)
+{
+    uint64_t oldstate = state;
+    // Advance internal state
+    state = oldstate * 6364136223846793005ULL + (inc|1);
+    // Calculate output function (XSH RR), uses old state for
+    // maximum instruction level parallelism
+    uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
+    uint32_t rot = oldstate >> 59u;
+    return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
+}

examples/speedpcg32.c

@@ -0,0 +1,21 @@
+/* After compiling TESTU01 and adding the libraries to your paths,
+ * compile this program with
+ * cc -O3 speedpcg32.c pcg32.c -o speedpcg32 -ltestu01 -lprobdist -lmylib -lm
+ * then run it using ./speedpcg32.c
+ */
+
+#include "unif01.h"
+#include "ulec.h"
+
+uint32_t pcg32_random_r (void);
+
+int main (void)
+{
+	unif01_Gen *gen;
+
+	gen = unif01_CreateExternGenBits("pcg32_random_r", pcg32_random_r);
+	unif01_TimerSumGenWr (gen, 100000000, FALSE);
+	ulec_DeleteGen (gen);
+
+	return 0;
+}

examples/speedxoshiro128plusplus.c

@@ -0,0 +1,22 @@
+/* After compiling TESTU01 and adding the libraries to your paths,
+ * compile this program with
+ * cc -O3 speedxoshiro128plusplus.c xoshiro128plusplus.c \
+ *     -o speedxoshiro128plusplus -ltestu01 -lprobdist -lmylib -lm
+ * then run it using ./speedxoshiro128plusplus.c
+ */
+
+#include "unif01.h"
+#include "ulec.h"
+
+uint32_t xoshiro128plusplus (void);
+
+int main (void)
+{
+	unif01_Gen *gen;
+
+	gen = unif01_CreateExternGenBits("xoshiro128plusplus", xoshiro128plusplus);
+	unif01_TimerSumGenWr (gen, 100000000, FALSE);
+	ulec_DeleteGen (gen);
+
+	return 0;
+}

examples/testpcg32.c

@@ -0,0 +1,23 @@
+/* After compiling TESTU01 and adding the libraries to your paths,
+ * compile this program with
+ * cc -O3 testpcg32.c pcg32.c -o testpcg32 -ltestu01 -lprobdist -lmylib -lm
+ * then run it using ./testpcg32.c
+ * You can change the code to replace bbattery_SmallCrush, with
+ * bbattery_Crush and bbattery_BigCrush
+ */
+
+#include "unif01.h"
+#include "bbattery.h"
+
+uint32_t pcg32_random_r (void);
+
+int main (void)
+{
+	unif01_Gen *gen;
+
+	gen = unif01_CreateExternGenBits("pcg32_random_r", pcg32_random_r);
+	bbattery_SmallCrush (gen);
+	unif01_DeleteExternGenBits (gen);
+
+	return 0;
+}

examples/testxoshiro128plusplus.c

@@ -0,0 +1,24 @@
+/* After compiling TESTU01 and adding the libraries to your paths,
+ * compile this program with
+ * cc -O3 testxoshiro128plusplus.c xoshiro128plusplus.c -o \
+ *    testxoshiro128plusplus -ltestu01 -lprobdist -lmylib -lm
+ * then run it using ./testxoshiro128plusplus
+ * You can change the code to replace bbattery_SmallCrush, with
+ * bbattery_Crush and bbattery_BigCrush
+ */
+
+#include "unif01.h"
+#include "bbattery.h"
+
+uint32_t xoshiro128plusplus (void);
+
+int main (void)
+{
+	unif01_Gen *gen;
+
+	gen = unif01_CreateExternGenBits("xoshiro128plusplus", xoshiro128plusplus);
+	bbattery_SmallCrush (gen);
+	unif01_DeleteExternGenBits (gen);
+
+	return 0;
+}

examples/xoshiro128plusplus.c

@@ -0,0 +1,51 @@
+/*  Written in 2019 by David Blackman and Sebastiano Vigna ([email protected])
+
+To the extent possible under law, the author has dedicated all copyright
+and related and neighboring rights to this software to the public domain
+worldwide. This software is distributed without any warranty.
+
+See <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+Original source is available at:
+
+https://prng.di.unimi.it/
+
+Modified by Benson Muite in 2022 for use with TestU01
+
+Jump functions removed */
+#include <stdint.h>
+
+/* This is xoshiro128++ 1.0, one of our 32-bit all-purpose, rock-solid
+   generators. It has excellent speed, a state size (128 bits) that is
+   large enough for mild parallelism, and it passes all tests we are aware
+   of.
+
+   For generating just single-precision (i.e., 32-bit) floating-point
+   numbers, xoshiro128+ is even faster.
+
+   The state must be seeded so that it is not everywhere zero. */
+
+
+static inline uint32_t rotl(const uint32_t x, int k) {
+  return (x << k) | (x >> (32 - k));
+}
+
+static uint32_t s[4] = {53, 30301, 71423, 49323};
+
+uint32_t xoshiro128plusplus(void) {
+  const uint32_t result = rotl(s[0] + s[3], 7) + s[0];
+
+  const uint32_t t = s[1] << 9;
+
+  s[2] ^= s[0];
+  s[3] ^= s[1];
+  s[1] ^= s[2];
+  s[0] ^= s[3];
+
+  s[2] ^= t;
+
+  s[3] = rotl(s[3], 11);
+
+  return result;
+}
+