Using Dolphin's PPC Code instead of QEmu's?

04 January 2016, 22:00

Hi.

I'm not really into coding, but I've been on the emulators scene for a while now. Having delved a bit into Amiga emulation lately, I noticed that FS-UAE's PPC emulation (and in turn WinUAE's as well) comes from QEmu.

Dolphin (Wii/Gamecube Emu) also emulates a PPC Cpu and has 32-bit and 64-bit JIT (which works quite nicely if I must add), so I was wondering if the PPC emulation wouldn't be faster if the core from Dolphin was used instead.

If I'm talking gibberish, I'm sorry, as I've said, not much of a coder.

Toni Wilen · 04 January 2016, 22:06

There is very simple reason: It has no MMU emulation. Full MMU emulation is required.

turrican3 · 14 June 2016, 07:01

Perhaps you could have a look ???
Perhaps they did some progress with mmu ??

Link : https://github.com/dolphin-emu/dolph...owerPC/MMU.cpp
line 815 there is a part with pear pc mmu emulation.
Perhaps it's just bullshit, i don't know.

Locutus · 14 June 2016, 08:05

That code does not actually implement a real MMU behavior, its just the bare necessity required for GC games to run.

Locutus · 14 June 2016, 08:07

Just to quickly add:

Getting there halfway with implementing something like a MMU means getting nowhere.

Toni Wilen · 14 June 2016, 10:30

Exactly, it is a console emulator, it only needs to emulate what games require. No point in wasting time (developer or CPU) with features that are not used.

100% compatibility with any general purpose OS requires complete MMU emulation. Ask again when it runs PPC Linux

04 January 2016, 22:00	#1
Xeon3D Posts: n/a	Using Dolphin's PPC Code instead of QEmu's? Hi. I'm not really into coding, but I've been on the emulators scene for a while now. Having delved a bit into Amiga emulation lately, I noticed that FS-UAE's PPC emulation (and in turn WinUAE's as well) comes from QEmu. Dolphin (Wii/Gamecube Emu) also emulates a PPC Cpu and has 32-bit and 64-bit JIT (which works quite nicely if I must add), so I was wondering if the PPC emulation wouldn't be faster if the core from Dolphin was used instead. If I'm talking gibberish, I'm sorry, as I've said, not much of a coder.

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04 January 2016, 22:06	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 46 Posts: 24,811	There is very simple reason: It has no MMU emulation. Full MMU emulation is required.

14 June 2016, 07:01	#3
turrican3 Moon 1969 = amiga 1985 Join Date: Apr 2007 Location: belgium Age: 45 Posts: 3,692	Perhaps you could have a look ??? Perhaps they did some progress with mmu ?? Link : https://github.com/dolphin-emu/dolph...owerPC/MMU.cpp line 815 there is a part with pear pc mmu emulation. Perhaps it's just bullshit, i don't know.

14 June 2016, 08:05	#4
Locutus Registered User Join Date: Jul 2014 Location: Finland Posts: 1,004	That code does not actually implement a real MMU behavior, its just the bare necessity required for GC games to run.

14 June 2016, 08:07	#5
Locutus Registered User Join Date: Jul 2014 Location: Finland Posts: 1,004	Just to quickly add: Getting there halfway with implementing something like a MMU means getting nowhere.

14 June 2016, 10:30	#6
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 46 Posts: 24,811	Exactly, it is a console emulator, it only needs to emulate what games require. No point in wasting time (developer or CPU) with features that are not used. 100% compatibility with any general purpose OS requires complete MMU emulation. Ask again when it runs PPC Linux

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