alu

code/alu.py

@@ -1,36 +1,92 @@
-import binandint
+from binandint import *
-def alu(a,b,alu_ctrl):              #a,b为两个运算数，alu_ctrl为控制信号，返回运算结果result与是否为0 zero
+def alu(a,b,alu_ctrl):  #a,b为两个运算数，alu_ctrl为控制信号，返回运算结果result与是否为0 zero
-    if alu_ctrl=='00000':
+	signed = a-b
-        pass
+	if alu_ctrl=='00000':           #add,jalr
-    elif alu_ctrl=='00001':
+		alu_result = a+b
-        pass
+	elif alu_ctrl=='00001':         #sub
-    elif alu_ctrl=='00010':
+		alu_result = a-b
-        pass
+	elif alu_ctrl=='00010':         #or
-    elif alu_ctrl=='00011':
+		alu_result = a|b
-        pass
+	elif alu_ctrl=='00011':         #and
-    elif alu_ctrl=='00100':
+		alu_result = a&b
-        pass
+	elif alu_ctrl=='00100':         #slt
-    elif alu_ctrl=='00101':
+		if(signed >= 0):
-        pass
+			alu_result = 0
-    elif alu_ctrl=='00110':
+		else:
-        pass
+			alu_result = 1
-    elif alu_ctrl=='00111':
+	elif alu_ctrl=='00101':         #beq
-        pass
+		if a == b:
-    elif alu_ctrl=='01000':
+			alu_result = 1
-        pass
+		else:
-    elif alu_ctrl=='01001':
+			alu_result = 0
-        pass
+	elif alu_ctrl=='00110':         #bne
-    elif alu_ctrl=='01010':
+		if a != b:
-        pass
+			alu_result = 1
-    elif alu_ctrl=='01011':
+		else:
-        pass
+			alu_result = 0
-    elif alu_ctrl=='01100':
+	elif alu_ctrl=='00111':         #blt
-        pass
+		if a<b:
-    elif alu_ctrl=='01101':
+			alu_result = 1
-        pass
+		else:
-    elif alu_ctrl=='01110':
+			alu_result = 0
-        pass
+	elif alu_ctrl=='01000':         #bge
-    elif alu_ctrl=='01111':
+		if a>=b:
-        pass
+			alu_result = 1
-    else:
+		else:
-        pass
+			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