mandriota/impvm

Tiny virtual machine for math calculations

Virtual Machine : IMPv0

By Mark Mandriota

INDEX

• Virtual Machine : IMPv0
  • INDEX
  • Memory Model
  • Instruction Structure
    • Instruction Set
    • LOOPF
    • Combined Conditional Flags

Memory Model

organization method	kind size
static stack	64-bit

Instruction Structure

CODE	LOOPF	LF	EF	GF
4-bit	1-bit	1-bit	1-bit	1-bit

(total size: 8-bit)

Instruction Set

code	name	arg stack	ret stack	synopsis
0x0	REDO	mm	mm; mm	duplicate last
0x1	UNDO	mm		delete last
0x2	HROT	mm; mm	mm; mm	rotate stack up-down
0x3	TROT	mm; mm	mm; mm	rotate stack down-up
0x4	SWAP	mm; mm	mm; mm	exchange 2 elements
0x5	JUMP		mm	jump to code position
0x6	TEST		mm	compare values
0x7	IPUT		mm	get in data
0x8	OPUT	mm		put out data
0x9	LINC	mm; mm	mm	x+y
0xA	LDEC	mm; mm	mm	x-y
0xB	QINC	mm; mm	mm	x=x+k
0xC	QDEC	mm; mm	mm	x=x-k
0xD
0xE
0xF

LOOPF

If flag is setted, then pops N from the stack and repeats instruction while condf≠0 and k<N

Combined Conditional Flags

code	name	combination	synopsis
0b100	LF	LF	x<y (lower)
0b011	NLF	GF; EF	x≥y (not lower)
0b010	EF	EF	x=y (equal)
0b101	NEF	LF; GF	x≠y (not equal)
0b001	GF	GF	x>y (greater)
0b110	NGF	LF; EF	x≤y (not greater)
0b111	AF	LF; GF; EF	1 (always)
0b000	AF		1 (always)