[cmake] refactor: Use CPM over submodules (#143)

Transfers the majority of submodules and large externals to CPM, using source archives rather than full Git clones. Not only does this save massive amounts of clone and configure time, but dependencies are grabbed on-demand rather than being required by default. Additionally, CPM will (generally) automatically search for system dependencies, though certain dependencies have options to control this.

Testing shows gains ranging from 5x to 10x in terms of overall clone/configure time.

Reviewed-on: #143
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/dynarmic/tests/decoder_tests.cpp

@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2020 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#include <cstring>
+#include <iomanip>
+#include <iostream>
+
+#include <catch2/catch_test_macros.hpp>
+#include "dynarmic/common/assert.h"
+
+#include "dynarmic/frontend/A32/decoder/asimd.h"
+#include "dynarmic/frontend/A32/translate/impl/a32_translate_impl.h"
+#include "dynarmic/interface/A32/config.h"
+#include "dynarmic/ir/opcodes.h"
+
+using namespace Dynarmic;
+
+TEST_CASE("ASIMD Decoder: Ensure table order correctness", "[decode][a32][.]") {
+    const auto table = A32::GetASIMDDecodeTable<A32::TranslatorVisitor>();
+
+    const auto get_ir = [](const A32::ASIMDMatcher<A32::TranslatorVisitor>& matcher, u32 instruction) {
+        ASSERT(matcher.Matches(instruction));
+
+        const A32::LocationDescriptor location{0, {}, {}};
+        IR::Block block{location};
+        A32::TranslatorVisitor visitor{block, location, {}};
+        matcher.call(visitor, instruction);
+
+        return block;
+    };
+
+    const auto is_decode_error = [&get_ir](const A32::ASIMDMatcher<A32::TranslatorVisitor>& matcher, u32 instruction) {
+        const auto block = get_ir(matcher, instruction);
+
+        for (const auto& ir_inst : block) {
+            if (ir_inst.GetOpcode() == IR::Opcode::A32ExceptionRaised) {
+                if (static_cast<A32::Exception>(ir_inst.GetArg(1).GetU64()) == A32::Exception::DecodeError) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    };
+
+    for (auto iter = table.cbegin(); iter != table.cend(); ++iter) {
+        if (std::strncmp(iter->GetName(), "UNALLOCATED", 11) == 0) {
+            continue;
+        }
+
+        const u32 expect = iter->GetExpected();
+        const u32 mask = iter->GetMask();
+        u32 x = 0;
+        do {
+            const u32 instruction = expect | x;
+
+            const bool iserr = is_decode_error(*iter, instruction);
+            const auto alternative = std::find_if(table.cbegin(), iter, [instruction](const auto& m) { return m.Matches(instruction); });
+            const bool altiserr = is_decode_error(*alternative, instruction);
+
+            INFO("Instruction: " << std::hex << std::setfill('0') << std::setw(8) << instruction);
+            INFO("Expect:      " << std::hex << std::setfill('0') << std::setw(8) << expect);
+            INFO("Fill:        " << std::hex << std::setfill('0') << std::setw(8) << x);
+            INFO("Name:        " << iter->GetName());
+            INFO("iserr:       " << iserr);
+            INFO("alternative: " << alternative->GetName());
+            INFO("altiserr:    " << altiserr);
+
+            REQUIRE(((!iserr && alternative == iter) || (iserr && alternative != iter && !altiserr)));
+
+            x = ((x | mask) + 1) & ~mask;
+        } while (x != 0);
+    }
+}