Age | Commit message (Collapse) | Author | |
---|---|---|---|
2012-12-24 | End the use of global variables for CPU emulation. This creates fewer memory ↵ | Nebuleon Fumika | |
store instructions in many SNES, SA1 and APU opcodes. Fix the APU half-carry bug, which may be audible. globals.cpp: Get rid of A1, A2, A3, A4, W1, W2, W3, W4, Int8, Int16, Int32, Work8, Work16, Work32, Ans8, Ans16, Ans32. | |||
2012-12-23 | Various optimisations in the CPU emulation. | Nebuleon Fumika | |
Run the opcode as a tail call from the address calculation. This cuts on the needed return instructions. Pass the opcode address as a parameter; this keeps it in a register most of the time and avoids memory stores. | |||
2012-12-20 | Remove the SNES Open Bus behaviour by default. Also simplify translation again. | Nebuleon Fumika | |
SNES Open Bus is a quirk of the memory subsystem that allow reads of invalid addresses to return the last byte read from memory. However, it is seldom needed by a game, and it costs 1 to 3 MIPS instructions per SNES instruction to emulate. If you need SNES Open Bus, you can remove -DNO_OPEN_BUS from the Makefile. | |||
2012-12-18 | Un-inline a bunch of stuff. | Nebuleon Fumika | |
With the MIPS instruction cache, this means that two consecutive SNES CPU instructions using e.g. the same addressing style or the same opcode have a chance that the second one will use the first one's code and that it will be cached. | |||
2011-03-05 | first commit | Kitty Draper | |