1 files changed, 67 insertions, 0 deletions
diff --git a/externals/dynarmic/tests/fuzz_util.cpp b/externals/dynarmic/tests/fuzz_util.cpp
new file mode 100644
index 0000000000..12dc850b42
--- /dev/null
+++ b/externals/dynarmic/tests/fuzz_util.cpp
@@ -0,0 +1,67 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#include "./fuzz_util.h"
+
+#include <cstring>
+
+#include <fmt/format.h>
+#include <fmt/ostream.h>
+#include <mcl/assert.hpp>
+
+#include "./rand_int.h"
+#include "dynarmic/common/fp/fpcr.h"
+#include "dynarmic/common/fp/rounding_mode.h"
+
+using namespace Dynarmic;
+
+std::ostream& operator<<(std::ostream& o, Vector vec) {
+    return o << fmt::format("{:016x}'{:016x}", vec[1], vec[0]);
+}
+
+Vector RandomVector() {
+    return {RandInt<u64>(0, ~u64(0)), RandInt<u64>(0, ~u64(0))};
+}
+
+u32 RandomFpcr() {
+    FP::FPCR fpcr;
+    fpcr.AHP(RandInt(0, 1) == 0);
+    fpcr.DN(RandInt(0, 1) == 0);
+    fpcr.FZ(RandInt(0, 1) == 0);
+    fpcr.RMode(static_cast<FP::RoundingMode>(RandInt(0, 3)));
+    fpcr.FZ16(RandInt(0, 1) == 0);
+    return fpcr.Value();
+}
+
+InstructionGenerator::InstructionGenerator(const char* format) {
+    const size_t format_len = std::strlen(format);
+    ASSERT(format_len == 16 || format_len == 32);
+
+    if (format_len == 16) {
+        // Begin with 16 zeros
+        mask |= 0xFFFF0000;
+    }
+
+    for (size_t i = 0; i < format_len; i++) {
+        const u32 bit = 1u << (format_len - i - 1);
+        switch (format[i]) {
+        case '0':
+            mask |= bit;
+            break;
+        case '1':
+            bits |= bit;
+            mask |= bit;
+            break;
+        default:
+            // Do nothing
+            break;
+        }
+    }
+}
+
+u32 InstructionGenerator::Generate() const {
+    const u32 random = RandInt<u32>(0, 0xFFFFFFFF);
+    return bits | (random & ~mask);
+}