alu

code/alu.py

@@ -1,38 +1,87 @@
-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
-    if alu_ctrl == '00000':
-        pass
-    elif alu_ctrl == '00001':
-        pass
-    elif alu_ctrl == '00010':
-        pass
-    elif alu_ctrl == '00011':
-        pass
-    elif alu_ctrl == '00100':
-        pass
-    elif alu_ctrl == '00101':
-        pass
-    elif alu_ctrl == '00110':
-        pass
-    elif alu_ctrl == '00111':
-        pass
-    elif alu_ctrl == '01000':
-        pass
+    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':
-        pass
+        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':
-        pass
+        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':
-        pass
+        alu_result = 1
     elif alu_ctrl == '01100':
-        pass
+        alu_result = a ^ b
     elif alu_ctrl == '01101':
-        pass
+        alu_result = a << b
     elif alu_ctrl == '01110':
-        pass
+        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':
-        pass
-    else:
-        pass
+        if a < 0:
+            ua = a + 2**32
+        els