Still busy with life, but...

    Life is still keeping me busy, but I have had time to do some testing related to the Async bug. From what I can tell it's a semaphore issue causing a race condition which is why there is the intermittent nature of the bug. Generally speaking because DX64 runs at less than 100% speed we just get choppy sound on sync but every now and again we do get burst of over 100%. Using the ME for sound the bursts of speed happening more often(even more often with frame skip.) Whenever the ME is busy and the rest of the emu completely finishes it job and then tries to give the ME more work to do it usually gets added to the back of the line and continues about it's business. Sometimes however, the line is full and there is no more room and the proper signal isn't being sent back to the CPU emulation that it can receive more data, this causes the CPU to not only stop not sending audio data, but also to completely skip other audio related checks as we (DAC Rate changed, etc..) Assuming this is correct, I'm working to force the situation then I'll know for sure. It's the bypassing of the audio interrupt checks and the processing done during those interrupts is where we get our speed boost from the bug from.

    Now the big question. Can we use this to our advantage? Yes, no and sometimes. If sound is off and we process the bare minimal checks to prevent lock-ups then, yes. If sound is on and we have to process all the checks then, no not without lock-ups. However, if the sound on and we don't need all the checks for the audio or don't need to check as often then, maybe. Now those are all big if's, but we may see an advantage without sound. I'm currently working on narrowing down first what is bypassed in the CPU (I already know part of it but it doesn't explain the amount of speed we are getting or the lock-ups.) Then seeing what if any of it we can do without or modify for our own purposes through code. (It wouldn't be true emulation, but HLE isn't true emulation to begin with.)

P.S. If this can provide a boost then it would function even after the CPU move. The only question is can it? and can it with audio?