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+--- Thread: just question about dolphin & xbox 360 (/Thread-just-question-about-dolphin-xbox-360)
just question about dolphin & xbox 360 - Funkyakuma - 05-14-2013
Hello I'm new user of this emulator (french whith bad english xD ) and i have an ask after this:
"Instead of an Intel or AMD x86 CPU, Gamecube and Wii use an IBM PowerPC CPU. Games are programmed for this CPU: when emulating, every basic instruction a game runs needs to be translated to something a PC can execute. Depending on the instruction, this can take from 2x to 100x clock cycles, which explains why you need more than a 486MHz CPU to emulate a Gamecube."
The Xbox 360 processor' is also a PowerPC so any instruction translation needed isn't it ?
is just for information about this ^^
thanks
RE: just question about dolphin & xbox 360 - Shonumi - 05-15-2013
I'm assuming your question is purely theoretical since Dolphn does not run on the 360. If your CPU natively shares some of the same instructions of the emulated system's CPU, you don't need to translate; you just tell your CPU to use that instruction. Not every PowerPC CPU is the same, however. Some instructions might be similar but have slight differences (e.g. number of parameters) and some instructions may be missing altogether in some PowerPC variants.
RE: just question about dolphin & xbox 360 - AnyOldName3 - 05-15-2013
At some point, some people here decided it would be possible to get dolphin running on a PS3 at full speed, but that it would require so much work that it wouldn't be likely to happen, mainly due to the fact that virtually no-one knows any of the PS3's assembly language for its CPU and GPU-thing-which-isn't-the-same-as-a-PC's-GPU.
RE: just question about dolphin & xbox 360 - NaturalViolence - 05-15-2013
AnyOldName3 Wrote:At some point, some people here decided it would be possible to get dolphin running on a PS3 at full speed, but that it would require so much work that it wouldn't be likely to happen
Who decided that and when?
AnyOldName3 Wrote:mainly due to the fact that virtually no-one knows any of the PS3's assembly language for its CPU and GPU-thing-which-isn't-the-same-as-a-PC's-GPU.
Both are extremely well documented and the GPU in the PS3 is almost completely identical to the PC GPU chip that it is based off of (NV77 or NV79 if I recall).
The Xbox360 does have a PPC cpu but that in no way means that high speed emulation would be feasible with extremely poor accuracy. There is a lot more to emulating a system than just the cpu ISA.
RE: just question about dolphin & xbox 360 - AnyOldName3 - 05-15-2013
Someone decided it was possible. I don't remember when, but I'm pretty sure even neobrain was involved in the discussion.
RE: just question about dolphin & xbox 360 - NaturalViolence - 05-16-2013
I'm 99% sure neobrain has never said that running games on dolphin at fullspeed on the ps3 was possible or even directly commented on the subject. Source please.
RE: just question about dolphin & xbox 360 - AnyOldName3 - 05-16-2013
This thread was where it was discussed. Apparently Neobrain had a very negative opinion, but Delroth thought it was entirely possible, but not necessarily at full speed.