PCSX2, the PS2 emulator has recently started doing this. mGBA has also been creating some excellent writeups.[1] https://endrift.com/mgba/2015/06/27/cycle-coun

PCSX2, the PS2 emulator has recently started doing this. mGBA has also been creating some excellent writeups.[1] https://endrift.com/mgba/2015/06/27/cycle-counting-prefetch/ https://endrift.com/mgba/2015/06/27/cycle-counting-prefetch/