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Most of the InvalidateICache calls are for a 32 bytes block: this is the number of bytes invalidated by PowerPC dcb*/icb* instructions. Profiling shows that a lot of CPU time is spent checking if there are any JIT blocks covered by these 32 bytes (using std::map::lower_bound). This patch adds a bitset containing the state of every 32 bytes block in RAM (JIT cached/not JIT cached). Using that, a 32 bytes InvalidateICache can check in the bitset if any JIT block might be invalidated. A bitset check is a lot faster than an std::map::lower_bound operation, improving performance of JitCache::InvalidateICache by more than 100%. Some practical numbers: * Xenoblade Chronicles (PAL) 56.04FPS -> 59.28FPS (+5.78%) * The Last Story (PAL) 30.9FPS -> 32.83FPS (+6.25%) * Super Mario Galaxy (PAL) 59.76FPS -> 62.46FPS (+4.52%) This function still takes more time than it should - more optimization in this area might be possible (specializing for 32 bytes blocks to avoid useless memcpy, for example).
Dolphin-emu - The Gamecube / Wii Emulator ========================================== Homesite: http://dolphin-emulator.com/ Project Site: http://code.google.com/p/dolphin-emu Dolphin-emu is a emulator for Gamecube, Wii, Triforce that lets you run Wii/GCN/Tri games on your Windows/Linux/Mac PC system. Open Source Release under GPL 2 Project Leaders: F|RES, ector Team members: http://code.google.com/p/dolphin-emu/people/ Please read the FAQ before use: http://code.google.com/p/dolphin-emu/wiki/Facts_And_Questions System Requirements: * OS: Microsoft Windows (2000/XP/Vista or higher) or Linux or Apple Mac OS X. * Processor: Fast CPU with SSE2 supported (recommended at least 2Ghz). Dual Core for speed boost. * Graphics: Any graphics card that supports Direct3D 9 or OpenGL 2.1. [Command line usage] Usage: Dolphin [-h] [-d] [-l] [-e <str>] [-b] [-V <str>] [-A <str>] -h, --help Show this help message -d, --debugger Opens the debugger -l, --logger Opens the logger -e, --exec=<str> Loads the specified file (DOL,ELF,WAD,GCM,ISO) -b, --batch Exit Dolphin with emulator -V, --video_backend=<str> Specify a video plugin -A, --audio_emulation=<str> Low level (LLE) or high level (HLE) audio [Libraries] Cg: Cg Shading API (http://developer.nvidia.com/object/cg_toolkit.html) *.pdb = Program Debug Database (use these symbols with a program debugger) [DSP Plugins] Plugin_DSP_HLE: High Level DSP Emulation Plugin_DSP_LLE: Low Level DSP Emulation [Video Backends] Direct3D9: Render with Direct3D 9 Direct3D11: Render with Direct3D 11 OpenGL: Render with OpenGL + Cg Shader Language [Sys Files] totaldb.dsy: Database of symbols (for devs only) font_ansi.bin/font_sjis.bin: font dumps setting-usa/jpn/usa.txt: config files for Wii [Support Folders] Cache: used to cache the ISO list Config: emulator configuration files Dump: anything dumped from dolphin will go here GC: Gamecube memory cards GameConfig: holds the INI game config files Load: high resolution textures Logs: logs go here Maps: symbol tables go here (dev only) OpenCL: OpenCL code ScreenShots: screenshots are saved here Shaders: post-processing shaders StateSaves: save states are stored here Wii: Wii saves and config is stored here