9 commits

Author	SHA1	Message	Date
Nebuleon Fumika	1896286ad5	Permanently remove NO_OPEN_BUS hacks. It was a premature optimisation.	2013-01-08 16:26:43 -05:00
Nebuleon Fumika	7c1327bd24	Move all CPU cycle calculations into cpuops.cpp.	2013-01-04 23:12:10 -05:00
Nebuleon Fumika	bfef6f17bd	Move some CPU cycle calculation from address resolution to the opcodes. This is to eventually move it from the resolved-address ops as well, reducing the number of memory stores.	2013-01-04 15:54:12 -05:00
Nebuleon Fumika	c8935c352c	Make cleanly without -DCPU_SHUTDOWN.	2012-12-27 18:46:37 -05:00
Nebuleon Fumika	e5869adc44	Merge Registers structures into their respective CPUs to avoid additional memory addresses being loaded every opcode.	2012-12-26 14:42:02 -05:00
Nebuleon Fumika	f29c76dc58	End the use of global variables for CPU emulation. This creates fewer memory 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.	2012-12-24 03:53:20 -05:00
Nebuleon Fumika	d1fe64aef0	Various optimisations in the CPU emulation. ... 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.	2012-12-23 16:13:54 -05:00
Nebuleon Fumika	8085880130	Remove the SNES Open Bus behaviour by default. Also simplify translation again. ... 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.	2012-12-20 18:14:24 -05:00
Kitty Draper	d40ae99422	first commit	2011-03-05 21:39:25 -05:00