def addi(operands, label_dict, line_num):
"""
Operation : %rt <- %rs + $imm
Format : [ 001000 | %rs | %rt | $imm ]
"""
imm_pattern = re.compile(r"\$-?\d+")
match = imm_pattern.match(operands[2])
if match is not None:
imm_bin = Parser.parse_operand(operands[2], Operandtype.IMMEDIATE)[1]
else:
# operand may be label
imm_bin = utils.imm2bin(label_dict[operands[2]])
assert len(imm_bin) <= 16, "too large integer operand"
inst_bin = (
"001000"
+ Parser.parse_operand(operands[1], Operandtype.REGISTER_DIRECT)[0]
+ Parser.parse_operand(operands[0], Operandtype.REGISTER_DIRECT)[0]
+ imm_bin
)
return utils.bin2bytes(inst_bin)
