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def alu_controller(alu_op, funct7,
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funct3): # alu_op来自主控制器，funct7和funct3来自指令的特定部位 返回alu_ctrl
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if alu_op == '00':
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opreation = '00000' # lw.sw.auipc
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elif alu_op == '01':
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if funct3 == '000':
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opreation = '00101' # beq
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elif funct3 == '001':
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opreation = '00110' # bne
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elif funct3 == '100':
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opreation = '00111' # blt
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elif funct3 == '101':
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opreation = '01000' # bge
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elif funct3 == '110':
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opreation = '01001' # bltu
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elif funct3 == '111':
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opreation = '01010' # bgeu
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else:
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opreation = '00000'
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elif alu_op == '10':
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if funct3 == '000':
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if funct7 == '0100000': # sub
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opreation = '00001'
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else: # add,addi
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opreation = '00000'
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elif funct3 == '100':
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opreation = '01100' # xor,xori
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elif funct3 == '110':
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opreation = '00010' # or,ori
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elif funct3 == '111':
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opreation = '00011' # and, andi
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elif funct3 == '010':
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opreation = '00100' # slt,slti
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elif funct3 == '001':
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opreation = '01101' # sll,slli 未存在
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elif funct3 == '011':
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opreation = '01110' # sliu,sltiu 未存在
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elif funct3 == '101':
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if funct7 == '0100000': # sra,srai
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opreation = '01111'
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else: # srl,srli
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opreation = '10000'
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else:
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opreation = '00000'
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elif alu_op == '11': # jal
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opreation = '01011'
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else:
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opreation = '00000'
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return opreation
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