Emulateur GameCube / Wii : Dolphin v3.0.776 - News

Pour consulter les changements, rendez vous à cette adresse :
http://code.google.com/p/dolphin-emu/source/list

Version 3.0-776
Optimize JitCache::InvalidateICache by maintaining a "valid blocks" bitset

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).

Version 3.0-775
Implement a simple benchmarking mode which logs FPS to a file

Very useful to compare performance between two builds, check the impact of
a configuration option, etc. FPS log is stored in User/Logs/fps.txt and is
reset each time you launch a game. Only enabled if you check the "Log FPS
to file" option in your graphics settings.

Could be improved a bit: currently logs only every 1s (so you can't really see small variations), maybe output more infos to the fps.txt like average/stddev (but Excel/Libreoffice/Google Docs can compute that easily too).

Version 3.0-774
Video_DX11: Remove some redundant code.