how does the dolphin emulator compare to the pcsx2 emulator

I feel confident that if we used SSE/MMX regs for addiu and etc., it would be signficantly slower. They wider registers could be nice but they may also cause problems (with how the sign extending works etc). They wider registers could be nice but they may also cause problems (with how the sign extending works I agree the 16 registers instead of 8 would be very much an advantage, it would cut down a lot of swapping in and out of the live cpu registers making instructions execute much quicker, especially in the case of the VU's where it's handling lots of floats at the same time, however i suspect AVX would be very nice for the VU's as well, although they don't require 64bit as such.īut beyond the extra registers, I'm not sure if there will be much in the way of advantages in a 64bit the PS2 registers are very similar to SSE but can be seen as 64bit pairs, although generally the instructions are 32bit and the upper 32bits is just an extension of the sign, apart from MMI instructions the upper 64bits generally goes untouched, but then MMI is pretty much SSE in 95% of all cases.

It is pretty much the result I the PS2 registers are very similar to SSE but can be seen as 64bit pairs, although generally the instructions are 32bit and the upper 32bits is just an extension of the sign, apart from MMI instructions the upper 64bits generally goes untouched, but then MMI is pretty much SSE in 95% of all cases. Thank you very much for your input guys, I appreciate you all taking the time to reply to this.

If that's the bottleneck, then yeah, no emitter is really gonna fix that situation. From my ps2autotests, I seem to recall that it's basically using the full range of the exponent. And the ARM64/ARM32/圆4 emitters are not all that similar, so it's not like not using the 圆4 one excludes the idea of using the ARM64 sometime in the future. Nevertheless, yeah, emitter probably doesn't matter. I do feel like 64-bit would inarguably generate less code with more mappable regs, even if the code didn't have better timings (which it might), and less code still matters (we've seen this in ppsspp even on 圆4 when we improved imm encoding in some instructions.) See MOVUPD that shows different encodings and how they affect YMM regs.Īren't the ps2's regs 64-bit (technically 128 but really it's just a pair)? Does pcsx2 just use SSE regs for even GPR or something to workaround this? I have not looked much at pcsx2's jit but last time I did it seemed like this was the case. AFAIK the registers are aliased although I don't know if there's some perf impact to changing pipelines or whatnot.

How does the dolphin emulator compare to the pcsx2 emulator