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