CMP: Difference between revisions

Revision as of 04:02, 18 May 2023

CMP (Compare) is a 65x instruction that compares the value of the accumulator.


Basic Info
Addressing Mode	Opcode	Length	Speed
immediate	C9	2 bytes	2 cycles
absolute	CD	3 bytes	4 cycles
absolute long	CF	4 bytes	5 cycles
direct page	C5	2 bytes	3 cycles
direct page indirect	D2	2 bytes	5 cycles
direct page indirect long	C7	2 bytes	6 cycles
absolute indexed by X	DD	3 bytes	4 cycles
absolute long indexed by X	DF	4 bytes	5 cycles
absolute indexed by Y	D9	3 bytes	4 cycles
direct page indexed by X	D5	2 bytes	4 cycles
direct page indexed indirect by X	C1	2 bytes	6 cycles
direct page indirect indexed by Y	D1	2 bytes	5 cycles
direct page indirect long indexed by Y	D7	2 bytes	6 cycles
stack relative	C3	2 bytes	4 cycles
stack relative indirect indexed by Y	D3	2 bytes	7 cycles


Flags Clobbered
N	V	M	X	D	I	Z	C
	.	.	.	.	.

@@ Line 118: / Line 118: @@
 * [[Leventhal]] page on CMP: https://archive.org/details/6502-assembly-language-programming/page/n105
 * snes9x implementation of CMP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L304
+* undisbeliever on CMP: https://undisbeliever.net/snesdev/65816-opcodes.html#cmp-compare-accumulator-with-memory
 [[Category:ASM]]
 [[Category:Group One Instructions]]
 [[Category:Inherited from 6502]]