# RV32I Base Instruction Set

Source: 'Table 25.2: Instruction listing for RISC-V' The RISC-V Instruction Set Manual Volume I: Unprivileged ISADocument Version 20190608-Base-Ratified

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31 28	27 24	23 20	19 15	14 12	11 7	6 0
fm	pred	succ	rs1	000	rd	0001111	FENCE

# R-type

31 25	24 20	19 15	14 12	11 7	6 0
0000000	shamt	rs1	001	rd	0010011	SLLI
0000000	shamt	rs1	101	rd	0010011	SRLI
0100000	shamt	rs1	101	rd	0010011	SRAI
0000000	rs2	rs1	000	rd	0110011	ADD
0100000	rs2	rs1	000	rd	0110011	SUB
0000000	rs2	rs1	001	rd	0110011	SLL
0000000	rs2	rs1	010	rd	0110011	SLT
0000000	rs2	rs1	011	rd	0110011	SLTU
0000000	rs2	rs1	100	rd	0110011	XOR
0000000	rs2	rs1	101	rd	0110011	SRL
0100000	rs2	rs1	101	rd	0110011	SRA
0000000	rs2	rs1	110	rd	0110011	OR
0000000	rs2	rs1	111	rd	0110011	AND

# I-type

31 20	19 15	14 12	11 7	6 0
imm[11:0]	rs1	000	rd	1101111	JALR
imm[11:0]	rs1	000	rd	0000011	LB
imm[11:0]	rs1	001	rd	0000011	LH
imm[11:0]	rs1	010	rd	0000011	LW
imm[11:0]	rs1	100	rd	0000011	LBU
imm[11:0]	rs1	101	rd	0000011	LHU
imm[11:0]	rs1	000	rd	0010011	ADDI
imm[11:0]	rs1	010	rd	0010011	SLTI
imm[11:0]	rs1	011	rd	0010011	SLTIU
imm[11:0]	rs1	100	rd	0010011	XORI
imm[11:0]	rs1	110	rd	0010011	ORI
imm[11:0]	rs1	111	rd	0010011	ANDI
000000000000	00000	000	00000	1110011	ECALL
000000000001	00000	000	00000	1110011	EBREAK

# S-type

31 25	24 20	19 15	14 12	11 7	6 0
imm[11:5]	rs2	rs1	000	imm[4:0]	0100011	SB
imm[11:5]	rs2	rs1	001	imm[4:0]	0100011	SH
imm[11:5]	rs2	rs1	010	imm[4:0]	0100011	SW

# B-type

31 25	24 20	19 15	14 12	11 7	6 0
imm[12|10:5]	rs2	rs1	000	imm[4:1|11]	1100011	BEQ
imm[12|10:5]	rs2	rs1	001	imm[4:1|11]	1100011	BNE
imm[12|10:5]	rs2	rs1	100	imm[4:1|11]	1100011	BLT
imm[12|10:5]	rs2	rs1	101	imm[4:1|11]	1100011	BGE
imm[12|10:5]	rs2	rs1	110	imm[4:1|11]	1100011	BLTU
imm[12|10:5]	rs2	rs1	111	imm[4:1|11]	1100011	BGEU

# U-type

31 12	11 7	6        0
imm[31:12]	rd	01101111	LUI
imm[31:12]	rd	00101111	AUIPC

# J-type

31 12	11 7	6 0
imm[20|10:1|11|19:12]	rd	1101111	JAL