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from binandint import *
def alu ( a , b , alu_ctrl ) : # a,b为两个运算数， ，
signed = a - b
if alu_ctrl == ' 00000 ' : # add,jalr
alu_result = a + b
elif alu_ctrl == ' 00001 ' : # sub
alu_result = a - b
elif alu_ctrl == ' 00010 ' : # or
alu_result = a | b
elif alu_ctrl == ' 00011 ' : # and
alu_result = a & b
elif alu_ctrl == ' 00100 ' : # slt
if ( signed > = 0 ) :
alu_result = 0
else :
alu_result = 1
elif alu_ctrl == ' 00101 ' : # beq
if a == b :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 00110 ' : # bne
if a != b :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 00111 ' : # blt
if a < b :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 01000 ' : # bge
if a > = b :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 01001 ' :
if a < 0 :
ua = a + 2 * * 32
else :
ua = a
if b < 0 :
ub = b + 2 * * 32
else :
ub = b
if ua < ub :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 01010 ' :
if a < 0 :
ua = a + 2 * * 32
else :
ua = a
if b < 0 :
ub = b + 2 * * 32
else :
ub = b
if ua > = ub :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 01011 ' :
alu_result = 1
elif alu_ctrl == ' 01100 ' :
alu_result = a ^ b
elif alu_ctrl == ' 01101 ' :
alu_result = a << b
elif alu_ctrl == ' 01110 ' :
if a < 0 :
ua = a + 2 * * 32
else :
ua = a
if b < 0 :
ub = b + 2 * * 32
else :
ub = b
if ua < = ub :
alu_result = 1
else :
alu_result = 0
elif alu_ctrl == ' 01111 ' :
if a < 0 :
ua = a + 2 * * 32
else :
ua = a
alu_result = a >> b
elif alu_ctrl == ' 10000 ' :
alu_result = a >> b
else :
alu_result = 0
return alu_result
