[*] change all std::unordered_map and std::unordered_set into ankerl::unordered_dense::map/set variants (#3442)

mainly doing this to reduce memory footprint; we all know how nice ankerl::unordered_dense is

in theory 4x faster - in practice these maps arent that "hot" anyways so not likely to have much perf gained

i just want to reduce mem fragmentation to ease my porting process, plus it helps other platforms as well (ahem weak Mediatek devices) :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3442
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

5 files changed, 18 insertions, 12 deletions

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 042f5c7bd9..58d2b2279e 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -253,7 +253,7 @@ if (lz4_ADDED)
     target_include_directories(common PRIVATE ${lz4_SOURCE_DIR}/lib)
 endif()
 
-target_link_libraries(common PUBLIC fmt::fmt stb::headers Threads::Threads)
+target_link_libraries(common PUBLIC fmt::fmt stb::headers Threads::Threads unordered_dense::unordered_dense)
 target_link_libraries(common PRIVATE lz4::lz4 LLVM::Demangle zstd::zstd)
 
 if(ANDROID)
diff --git a/src/common/fs/path_util.cpp b/src/common/fs/path_util.cpp
index 9b57fda295..3f928ac327 100644
--- a/src/common/fs/path_util.cpp
+++ b/src/common/fs/path_util.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -7,7 +7,7 @@
 #include <algorithm>
 #include <iostream>
 #include <sstream>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/assert.h"
 #include "common/fs/fs.h"
@@ -193,8 +193,8 @@ private:
         SetLegacyPathImpl(legacy_path, new_path);
     }
 
-    std::unordered_map<EdenPath, fs::path> eden_paths;
-    std::unordered_map<EmuPath, fs::path> legacy_paths;
+    ankerl::unordered_dense::map<EdenPath, fs::path> eden_paths;
+    ankerl::unordered_dense::map<EmuPath, fs::path> legacy_paths;
 };
 
 bool ValidatePath(const fs::path& path) {
diff --git a/src/common/host_memory.cpp b/src/common/host_memory.cpp
index 51ee0d333b..a1e99a4c9d 100644
--- a/src/common/host_memory.cpp
+++ b/src/common/host_memory.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -7,7 +7,7 @@
 #ifdef _WIN32
 
 #include <iterator>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <boost/icl/separate_interval_set.hpp>
 #include <windows.h>
 #include "common/dynamic_library.h"
@@ -391,7 +391,7 @@ private:
 
     std::mutex placeholder_mutex;                                 ///< Mutex for placeholders
     boost::icl::separate_interval_set<size_t> placeholders;       ///< Mapped placeholders
-    std::unordered_map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
+    ankerl::unordered_dense::map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
 };
 
 #else // ^^^ Windows ^^^ vvv POSIX vvv
diff --git a/src/common/input.h b/src/common/input.h
index 2c4ccea22e..b076fd7e6b 100644
--- a/src/common/input.h
+++ b/src/common/input.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2017 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -6,7 +9,7 @@
 #include <functional>
 #include <memory>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <utility>
 #include <vector>
 #include "common/logging/log.h"
@@ -409,7 +412,7 @@ public:
 namespace Impl {
 
 template <typename InputDeviceType>
-using FactoryListType = std::unordered_map<std::string, std::shared_ptr<Factory<InputDeviceType>>>;
+using FactoryListType = ankerl::unordered_dense::map<std::string, std::shared_ptr<Factory<InputDeviceType>>>;
 
 template <typename InputDeviceType>
 struct FactoryList {
diff --git a/src/common/param_package.h b/src/common/param_package.h
index d7c13cb1fc..0216863a39 100644
--- a/src/common/param_package.h
+++ b/src/common/param_package.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2017 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -5,14 +8,14 @@
 
 #include <initializer_list>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 namespace Common {
 
 /// A string-based key-value container supporting serializing to and deserializing from a string
 class ParamPackage {
 public:
-    using DataType = std::unordered_map<std::string, std::string>;
+    using DataType = ankerl::unordered_dense::map<std::string, std::string>;
 
     ParamPackage() = default;
     explicit ParamPackage(const std::string& serialized);