add:
  encoding: 0000000----------000-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x33'
  variable_fields:
  - rd
  - rs1
  - rs2
addi:
  encoding: '-----------------000-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x13'
  variable_fields:
  - rd
  - rs1
  - imm12
and:
  encoding: 0000000----------111-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x7033'
  variable_fields:
  - rd
  - rs1
  - rs2
andi:
  encoding: '-----------------111-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x7013'
  variable_fields:
  - rd
  - rs1
  - imm12
auipc:
  encoding: '-------------------------0010111'
  extension:
  - rv_i
  mask: '0x7f'
  match: '0x17'
  variable_fields:
  - rd
  - imm20
beq:
  encoding: '-----------------000-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x63'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
bge:
  encoding: '-----------------101-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x5063'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
bgeu:
  encoding: '-----------------111-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x7063'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
blt:
  encoding: '-----------------100-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x4063'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
bltu:
  encoding: '-----------------110-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x6063'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
bne:
  encoding: '-----------------001-----1100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x1063'
  variable_fields:
  - bimm12hi
  - rs1
  - rs2
  - bimm12lo
ebreak:
  encoding: '00000000000100000000000001110011'
  extension:
  - rv_i
  mask: '0xffffffff'
  match: '0x100073'
  variable_fields: []
ecall:
  encoding: '00000000000000000000000001110011'
  extension:
  - rv_i
  mask: '0xffffffff'
  match: '0x73'
  variable_fields: []
fence:
  encoding: '-----------------000-----0001111'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0xf'
  variable_fields: []
jal:
  encoding: '-------------------------1101111'
  extension:
  - rv_i
  mask: '0x7f'
  match: '0x6f'
  variable_fields:
  - rd
  - jimm20
jalr:
  encoding: '-----------------000-----1100111'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x67'
  variable_fields:
  - rd
  - rs1
  - imm12
lb:
  encoding: '-----------------000-----0000011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x3'
  variable_fields:
  - rd
  - rs1
  - imm12
lbu:
  encoding: '-----------------100-----0000011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x4003'
  variable_fields:
  - rd
  - rs1
  - imm12
lh:
  encoding: '-----------------001-----0000011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x1003'
  variable_fields:
  - rd
  - rs1
  - imm12
lhu:
  encoding: '-----------------101-----0000011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x5003'
  variable_fields:
  - rd
  - rs1
  - imm12
lui:
  encoding: '-------------------------0110111'
  extension:
  - rv_i
  mask: '0x7f'
  match: '0x37'
  variable_fields:
  - rd
  - imm20
lw:
  encoding: '-----------------010-----0000011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x2003'
  variable_fields:
  - rd
  - rs1
  - imm12
or:
  encoding: 0000000----------110-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x6033'
  variable_fields:
  - rd
  - rs1
  - rs2
ori:
  encoding: '-----------------110-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x6013'
  variable_fields:
  - rd
  - rs1
  - imm12
sb:
  encoding: '-----------------000-----0100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x23'
  variable_fields:
  - imm12hi
  - rs1
  - rs2
  - imm12lo
sh:
  encoding: '-----------------001-----0100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x1023'
  variable_fields:
  - imm12hi
  - rs1
  - rs2
  - imm12lo
sll:
  encoding: 0000000----------001-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x1033'
  variable_fields:
  - rd
  - rs1
  - rs2
slli:
  encoding: 0000000----------001-----0010011
  extension:
  - rv32_i
  mask: '0xfe00707f'
  match: '0x1013'
  variable_fields:
  - rd
  - rs1
  - shamtw
slt:
  encoding: 0000000----------010-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x2033'
  variable_fields:
  - rd
  - rs1
  - rs2
slti:
  encoding: '-----------------010-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x2013'
  variable_fields:
  - rd
  - rs1
  - imm12
sltiu:
  encoding: '-----------------011-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x3013'
  variable_fields:
  - rd
  - rs1
  - imm12
sltu:
  encoding: 0000000----------011-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x3033'
  variable_fields:
  - rd
  - rs1
  - rs2
sra:
  encoding: 0100000----------101-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x40005033'
  variable_fields:
  - rd
  - rs1
  - rs2
srai:
  encoding: 0100000----------101-----0010011
  extension:
  - rv32_i
  mask: '0xfe00707f'
  match: '0x40005013'
  variable_fields:
  - rd
  - rs1
  - shamtw
srl:
  encoding: 0000000----------101-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x5033'
  variable_fields:
  - rd
  - rs1
  - rs2
srli:
  encoding: 0000000----------101-----0010011
  extension:
  - rv32_i
  mask: '0xfe00707f'
  match: '0x5013'
  variable_fields:
  - rd
  - rs1
  - shamtw
sub:
  encoding: 0100000----------000-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x40000033'
  variable_fields:
  - rd
  - rs1
  - rs2
sw:
  encoding: '-----------------010-----0100011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x2023'
  variable_fields:
  - imm12hi
  - rs1
  - rs2
  - imm12lo
xor:
  encoding: 0000000----------100-----0110011
  extension:
  - rv_i
  mask: '0xfe00707f'
  match: '0x4033'
  variable_fields:
  - rd
  - rs1
  - rs2
xori:
  encoding: '-----------------100-----0010011'
  extension:
  - rv_i
  mask: '0x707f'
  match: '0x4013'
  variable_fields:
  - rd
  - rs1
  - imm12

div:
  encoding: 0000001----------100-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2004033'
  variable_fields:
  - rd
  - rs1
  - rs2
divu:
  encoding: 0000001----------101-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2005033'
  variable_fields:
  - rd
  - rs1
  - rs2
mul:
  encoding: 0000001----------000-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2000033'
  variable_fields:
  - rd
  - rs1
  - rs2
mulh:
  encoding: 0000001----------001-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2001033'
  variable_fields:
  - rd
  - rs1
  - rs2
mulhsu:
  encoding: 0000001----------010-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2002033'
  variable_fields:
  - rd
  - rs1
  - rs2
mulhu:
  encoding: 0000001----------011-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2003033'
  variable_fields:
  - rd
  - rs1
  - rs2
rem:
  encoding: 0000001----------110-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2006033'
  variable_fields:
  - rd
  - rs1
  - rs2
remu:
  encoding: 0000001----------111-----0110011
  extension:
  - rv_m
  mask: '0xfe00707f'
  match: '0x2007033'
  variable_fields:
  - rd
  - rs1
  - rs2