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def alu_controller(alu_op,funct7,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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