VM instructions / opcodes

Final Fantasy XII VM supports 100 known opcodes. There are three types of instructions. Instructions with an immediate, which are 3 bytes long, instructions without immediate, which are 1 byte long and special instructions like NOP and LABEL that have a defined size of zero and thus can't be used, because it causes the VM to loop indefinitely. These are probably used only by compiler and never put in the code itself.

Name	Opcode	Size	Immediate	Arguments	Description
NOP	0x00	0	no	0	Don't use. It causes eternal loop
LABEL	0x01	0	no	0	Don't use. It causes eternal loop
TAG	0x02	0	no	0	Don't use. It causes eternal loop
SYSHALT	0x03	1	no	0
SYSTEM	0x04	1	no	1
OPLOR	0x05	1	no	2	Logical or
OPLAND	0x06	1	no	2	Logical and
OPOR	0x07	1	no	2	Binary or
OPEOR	0x08	1	no	2	Binary exclusive or
OPAND	0x09	1	no	2	Binary and
OPEQ	0x0a	1	no	2	Compares whether two values on stack are equal
OPNE	0x0b	1	no	2	Compares whether two values on stack are not equal
OPGT	0x0c	1	no	2	Compares whether second value on stack is greater than first
OPLS	0x0d	1	no	2	Compares whether second value on stack is less than first
OPGTE	0x0e	1	no	2	Compares whether second value on stack is greater or equal to first
OPLSE	0x0f	1	no	2	Compares whether second value on stack is less or equal to first
OPSLL	0x10	1	no	2	Shift left logical
OPSRL	0x11	1	no	2	Shift right logical
OPADD	0x12	1	no	2	Addition
OPSUB	0x13	1	no	2	Substraction
OPMUL	0x14	1	no	2	Multiplication
OPDIV	0x15	1	no	2	Division
OPMOD	0x16	1	no	2	Modulo
OPNOT	0x17	1	no	1	Logical negation
OPBNOT	0x18	1	no	1	Binary negation
OPUMINUS	0x19	1	no	1	Not used
OPFIXADRS	0x1a	1	no	1	Not used
PUSHA	0x1b	1	no	0	Pushes contents of A register to stack
POPA	0x1c	1	no	0	Pops stack into A register
PUSHX	0x1d	1	no	0	Pushes contents of X register to stack
PUSHY	0x1e	1	no	0	Pushes contents of Y register to stack
POPX	0x1f	1	no	0	Pops stack into X register
POPY	0x20	1	no	0	Pops stack into Y register
REQ	0x21	1	no	3
FREQ	0x22	1	no	3
TREQ	0x23	1	no	3
REQSW	0x24	1	no	3
FREQSW	0x25	1	no	3
TREQSW	0x26	1	no	3
REQEW	0x27	1	no	3
FREQEW	0x28	1	no	3
TREQEW	0x29	1	no	3
PREQ	0x2a	1	no	3
PREQSW	0x2b	1	no	3
PREQEW	0x2c	1	no	3
RET	0x2d	1	no	0
RETN	0x2e	1	no	0
RETT	0x2f	1	no	0
RETTN	0x30	1	no	0
DRET	0x31	1	no	0
REQWAIT	0x32	1	no	2
PREQWAIT	0x33	1	no	2
REQCHG	0x34	1	no	2
REQCANCEL	0x35	1	no	2
POPI0	0x36	1	no	0
POPI1	0x37	1	no	0
POPI2	0x38	1	no	0
POPI3	0x39	1	no	0
POPF0	0x3a	1	no	0
POPF1	0x3b	1	no	0
POPF2	0x3c	1	no	0
POPF3	0x3d	1	no	0
PUSHI0	0x3e	1	no	0
PUSHI1	0x3f	1	no	0
PUSHI2	0x40	1	no	0
PUSHI3	0x41	1	no	0
PUSHF0	0x42	1	no	0
PUSHF1	0x43	1	no	0
PUSHF2	0x44	1	no	0
PUSHF3	0x45	1	no	0