1 files changed, 89 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace_xoroshiro128_plus.c b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace_xoroshiro128_plus.c
new file mode 100644
index 000000000000..fbc656a90e5c
--- /dev/null
+++ b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace_xoroshiro128_plus.c
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2016 (Graeme Jenkinson)
+ * All rights reserved.
+ *
+ * This software was developed by BAE Systems, the University of Cambridge
+ * Computer Laboratory, and Memorial University under DARPA/AFRL contract
+ * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
+ * (TC) research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ */
+
+#include <sys/types.h>
+
+#include "dtrace_xoroshiro128_plus.h"
+
+static __inline uint64_t
+rotl(const uint64_t x, int k)
+{
+	return (x << k) | (x >> (64 - k));
+}
+
+/*
+ * This is the jump function for the generator. It is equivalent to 2^64 calls
+ * to next(); it can be used to generate 2^64 non-overlapping subsequences for
+ * parallel computations.
+ */
+void
+dtrace_xoroshiro128_plus_jump(uint64_t * const state,
+	uint64_t * const jump_state)
+{
+	static const uint64_t JUMP[] = { 0xbeac0467eba5facb,
+		0xd86b048b86aa9922 };
+
+	uint64_t s0 = 0;
+	uint64_t s1 = 0;
+	int i = 0;
+	int b = 0;
+	for (i = 0; i < sizeof JUMP / sizeof *JUMP; i++) {
+		for (b = 0; b < 64; b++) {
+			if (JUMP[i] & 1ULL << b) {
+				s0 ^= state[0];
+				s1 ^= state[1];
+			}
+			dtrace_xoroshiro128_plus_next(state);
+		}
+	}
+	jump_state[0] = s0;
+	jump_state[1] = s1;
+}
+
+/*
+ * xoroshiro128+ - XOR/rotate/shift/rotate
+ * xorshift.di.unimi.it
+ */
+uint64_t
+dtrace_xoroshiro128_plus_next(uint64_t * const state)
+{
+	const uint64_t s0 = state[0];
+	uint64_t s1 = state[1];
+	uint64_t result;
+	result = s0 + s1;
+
+	s1 ^= s0;
+	state[0] = rotl(s0, 55) ^ s1 ^ (s1 << 14);
+	state[1] = rotl(s1, 36);
+
+	return result;
+}