Fixed use and def of div instruction.

src/optimize/advanced.py

@@ -141,7 +141,7 @@ def fold_constants(block):
 
         if s.name == 'li':
             # Save value in register
-            if not isinstance(s[1], int):
+            if not isinstance(s[1], int): # Negative numbers are stored as int
                 register[s[0]] = int(s[1], 16)
             else:
                 register[s[0]] = s[1]
@@ -176,6 +176,7 @@ def fold_constants(block):
         elif s.name in ['mult', 'div'] \
                 and s[0]in register and s[1] in register:
             # Multiplication/division with constants
+            print s
             rs, rt = s
             a, b = register[rs], register[rt]
 

src/statement.py

@@ -154,7 +154,7 @@ class Statement:
 
     def get_def(self):
         """Get the variable that this statement defines, if any."""
-        instr = ['move', 'addu', 'subu', 'li', 'dmfc1', 'mov.d']
+        instr = ['div', 'move', 'addu', 'subu', 'li', 'dmfc1', 'mov.d']
 
         if self.is_command('mtc1'):
             return [self[1]]
@@ -178,7 +178,7 @@ class Statement:
         if (self.is_branch() \
                 and not self.is_command(*['bc1f', 'bc1t', 'bct', 'bcf'])) \
                 or self.is_store() or self.is_compare() \
-                or self.is_command(*['mult', 'div', 'dsz', 'mtc1']):
+                or self.is_command(*['mult', 'dsz', 'mtc1']):
             if self.name == 'dsz':
                 m = re.match('^[^(]+\(([^)]+)\)$', self[0])
 
@@ -206,7 +206,7 @@ class Statement:
         # Case arg2
         if self.is_double_arithmetic() or self.is_set_if_less() \
                 or self.is_logical() or self.is_truncate() \
-                or self.is_command(*['addu', 'subu']):
+                or self.is_command(*['addu', 'subu', 'div']):
             if not isinstance(self[2], int):
                     use.append(self[2])
 

tests/test_statement.py

@@ -99,8 +99,9 @@ class TestStatement(unittest.TestCase):
         a = ['a']
 
         self.assertEqual(S('command', 'move', 'a', 'b').get_def(), a)
-        self.assertEqual(S('command', 'subu', 'a', 'b').get_def(), a)
+        self.assertEqual(S('command', 'subu', 'a', 'b', 'c').get_def(), a)
         self.assertEqual(S('command', 'addu', 'a', 'b', 'c').get_def(), a)
+        self.assertEqual(S('command', 'div', 'a', 'b', 'c').get_def(), a)
         self.assertEqual(S('command', 'sll', 'a', 'b', 'c').get_def(), a)
         self.assertEqual(S('command', 'srl', 'a', 'b', 'c').get_def(), a)
         self.assertEqual(S('command', 'la', 'a', '16($fp)').get_def(), a)
@@ -130,7 +131,7 @@ class TestStatement(unittest.TestCase):
         self.assertEqual(S('command', 'subu', '$3', '$1', '$2').get_use(), \
                 arg2)
         self.assertEqual(S('command', 'mult', '$1', '$2').get_use(), arg2)
-        self.assertEqual(S('command', 'div', '$1', '$2').get_use(), arg2)
+        self.assertEqual(S('command', 'div', '$3', '$1', '$2').get_use(), arg2)
         self.assertEqual(S('command', 'move', '$2', '$1').get_use(), arg1)
         self.assertEqual(S('command', 'beq', '$1', '$2', '$L1').get_use(), \
                 arg2)