Commit d383b940c2

@@ -1,132 +0,0 @@
-// Website: romu-random.org
-// Reference paper:   http://arxiv.org/abs/2002.11331
-// Beware: this PRNG is trivially predictable. While fast, it should *never* be used for cryptographic purposes.
-
-const std = @import("std");
-const Random = std.rand.Random;
-const math = std.math;
-const RomuTrio = @This();
-
-x_state: u64,
-y_state: u64,
-z_state: u64, // set to nonzero seed
-
-pub fn init(init_s: u64) RomuTrio {
-    var x = RomuTrio{ .x_state = undefined, .y_state = undefined, .z_state = undefined };
-    x.seed(init_s);
-    return x;
-}
-
-pub fn random(self: *RomuTrio) Random {
-    return Random.init(self, fill);
-}
-
-fn next(self: *RomuTrio) u64 {
-    const xp = self.x_state;
-    const yp = self.y_state;
-    const zp = self.z_state;
-    self.x_state = 15241094284759029579 *% zp;
-    self.y_state = yp -% xp;
-    self.y_state = std.math.rotl(u64, self.y_state, 12);
-    self.z_state = zp -% yp;
-    self.z_state = std.math.rotl(u64, self.z_state, 44);
-    return xp;
-}
-
-pub fn seedWithBuf(self: *RomuTrio, buf: [24]u8) void {
-    const seed_buf = @bitCast([3]u64, buf);
-    self.x_state = seed_buf[0];
-    self.y_state = seed_buf[1];
-    self.z_state = seed_buf[2];
-}
-
-pub fn seed(self: *RomuTrio, init_s: u64) void {
-    // RomuTrio requires 192-bits of seed.
-    var gen = std.rand.SplitMix64.init(init_s);
-
-    self.x_state = gen.next();
-    self.y_state = gen.next();
-    self.z_state = gen.next();
-}
-
-pub fn fill(self: *RomuTrio, buf: []u8) void {
-    var i: usize = 0;
-    const aligned_len = buf.len - (buf.len & 7);
-
-    // Complete 8 byte segments.
-    while (i < aligned_len) : (i += 8) {
-        var n = self.next();
-        comptime var j: usize = 0;
-        inline while (j < 8) : (j += 1) {
-            buf[i + j] = @truncate(u8, n);
-            n >>= 8;
-        }
-    }
-
-    // Remaining. (cuts the stream)
-    if (i != buf.len) {
-        var n = self.next();
-        while (i < buf.len) : (i += 1) {
-            buf[i] = @truncate(u8, n);
-            n >>= 8;
-        }
-    }
-}
-
-test "RomuTrio sequence" {
-    // Unfortunately there does not seem to be an official test sequence.
-    var r = RomuTrio.init(0);
-
-    const seq = [_]u64{
-        16294208416658607535,
-        13964609475759908645,
-        4703697494102998476,
-        3425221541186733346,
-        2285772463536419399,
-        9454187757529463048,
-        13695907680080547496,
-        8328236714879408626,
-        12323357569716880909,
-        12375466223337721820,
-    };
-
-    for (seq) |s| {
-        try std.testing.expectEqual(s, r.next());
-    }
-}
-
-test "RomuTrio fill" {
-    // Unfortunately there does not seem to be an official test sequence.
-    var r = RomuTrio.init(0);
-
-    const seq = [_]u64{
-        16294208416658607535,
-        13964609475759908645,
-        4703697494102998476,
-        3425221541186733346,
-        2285772463536419399,
-        9454187757529463048,
-        13695907680080547496,
-        8328236714879408626,
-        12323357569716880909,
-        12375466223337721820,
-    };
-
-    for (seq) |s| {
-        var buf0: [8]u8 = undefined;
-        var buf1: [7]u8 = undefined;
-        std.mem.writeIntLittle(u64, &buf0, s);
-        r.fill(&buf1);
-        try std.testing.expect(std.mem.eql(u8, buf0[0..7], buf1[0..]));
-    }
-}
-
-test "RomuTrio buf seeding test" {
-    const buf0 = [24]u8{ 175, 205, 29, 123, 57, 168, 32, 226, 37, 39, 185, 157, 84, 66, 204, 193, 204, 125, 231, 26, 243, 227, 70, 65 };
-    const resulting_state = .{ .x = 16294208416658607535, .y = 13964609475759908645, .z = 4703697494102998476 };
-    var r = RomuTrio.init(0);
-    r.seedWithBuf(buf0);
-    try std.testing.expect(r.x_state == resulting_state.x);
-    try std.testing.expect(r.y_state == resulting_state.y);
-    try std.testing.expect(r.z_state == resulting_state.z);
-}

@@ -26,7 +26,6 @@ pub const Pcg = @import("rand/Pcg.zig");
 pub const Xoroshiro128 = @import("rand/Xoroshiro128.zig");
 pub const Xoshiro256 = @import("rand/Xoshiro256.zig");
 pub const Sfc64 = @import("rand/Sfc64.zig");
-pub const RomuTrio = @import("rand/RomuTrio.zig");
 
 pub const Random = struct {
     ptr: *anyopaque,