dolphin-emu/dolphin
1
0
Fork 1
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-06-24 19:11:37 +02:00
Code Issues Packages Projects Releases Wiki Activity

Memmap: Optimize UpdateLogicalMemory by merging mappings

Browse Source 
Instead of creating many 128 KiB mappings, we can create a few large
mappings. On my Windows PC, this speeds up GameCube (FakeVMEM) game boot
times by about 200 ms and Wii game boot times by about 60 ms. Loading
savestates is also faster, by about 45 ms for GameCube (FakeVMEM) games
and 5 ms for Wii games. The impact is presumably smaller on other OSes
because Windows is particularly slow at creating mappings.
This commit is contained in:
JosJuice
2025-06-21 20:00:39 +02:00
parent 2047eaf1d8
commit ac84ea17a6
1 changed files with 16 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
Source/Core/Core/HW/Memmap.cpp
View File

@ -248,9 +248,24 @@ void MemoryManager::UpdateLogicalMemory(const PowerPC::BatTable& dbat_table)
if (dbat_table[i] & PowerPC::BAT_PHYSICAL_BIT)
{
u32 logical_address = i << PowerPC::BAT_INDEX_SHIFT;
// TODO: Merge adjacent mappings to make this faster.
u32 logical_size = PowerPC::BAT_PAGE_SIZE;
u32 translated_address = dbat_table[i] & PowerPC::BAT_RESULT_MASK;
while (i + 1 < dbat_table.size())
{
if (!(dbat_table[i + 1] & PowerPC::BAT_PHYSICAL_BIT))
{
++i;
break;
}
if ((dbat_table[i + 1] & PowerPC::BAT_RESULT_MASK) != translated_address + logical_size)
break;
++i;
logical_size += PowerPC::BAT_PAGE_SIZE;
}
for (const auto& physical_region : m_physical_regions)
{
if (!physical_region.active)