Map local variables in IR to their original names

TODO

@@ -3,10 +3,6 @@
 - To access named parameters inside a procedure, IR should be able to reference
   them. During the generation the needed information (e.g. offsets or registers)
   can be extracted from the symbol table and saved in the operands.
-- Glue always generates the same intermediate variable (LocalVariable 0) for
-  local variables. (LocalVariable 0) is handled the same as temporary variables
-  that are currently saved only in registers. There space on the stack allocated
-  for local variables.
 
 # ELF generation
 

lib/Language/Elna/Glue.hs

@@ -4,7 +4,7 @@ module Language.Elna.Glue
 
 import Control.Monad.Trans.State (State, gets, modify', runState)
 import Data.Bifunctor (Bifunctor(..))
-import Data.Foldable (Foldable(..))
+import Data.Foldable (Foldable(..), traverse_)
 import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HashMap
 import Data.Maybe (catMaybes)
@@ -25,10 +25,12 @@ import Language.Elna.Backend.Intermediate
 import Language.Elna.Frontend.SymbolTable (Info(..), SymbolTable)
 import qualified Language.Elna.Frontend.SymbolTable as SymbolTable
 import GHC.Records (HasField(..))
+import Language.Elna.Frontend.AST (Identifier(..))
 
 data Paste = Paste
     { temporaryCounter :: Word32
     , labelCounter :: Word32
+    , localMap :: HashMap Identifier Variable
     }
 
 newtype Glue a = Glue
@@ -50,9 +52,15 @@ instance Monad Glue
 glue :: SymbolTable -> AST.Program -> HashMap AST.Identifier (Vector (Quadruple Variable))
 glue globalTable
     = fst
-    . flip runState Paste{ temporaryCounter = 0, labelCounter = 0 }
+    . flip runState emptyPaste
     . runGlue
     . program globalTable
+  where
+    emptyPaste = Paste
+        { temporaryCounter = 0
+        , labelCounter = 0
+        , localMap = mempty
+        }
 
 program
     :: SymbolTable
@@ -65,13 +73,23 @@ declaration
     :: SymbolTable
     -> AST.Declaration
     -> Glue (Maybe (AST.Identifier, Vector (Quadruple Variable)))
-declaration globalTable (AST.ProcedureDeclaration procedureName _ _ statements)
+declaration globalTable (AST.ProcedureDeclaration procedureName _ variableDeclarations statements)
-    = Just
+    = traverse_ registerVariable variableDeclarations
+    >> statements' <$> traverse (statement globalTable) statements
+  where
+    registerVariable (AST.VariableDeclaration identifier _) = do
+        currentCounter <- fmap (fromIntegral . HashMap.size)
+            $ Glue $ gets $ getField @"localMap"
+        Glue $ modify' $ modifier identifier $ LocalVariable currentCounter
+    modifier identifier currentCounter generator = generator
+        { localMap = HashMap.insert identifier currentCounter
+            $ getField @"localMap" generator
+        }
+    statements' = Just
         . (procedureName,)
         . Vector.cons StartQuadruple
         . flip Vector.snoc StopQuadruple
         . fold
-    <$> traverse (statement globalTable) statements
 declaration _ (AST.TypeDefinition _ _) = pure Nothing
 
 statement :: SymbolTable -> AST.Statement -> Glue (Vector (Quadruple Variable))
@@ -104,15 +122,16 @@ statement localTable (AST.AssignmentStatement variableAccess' assignee) = do
     (rhsOperand, rhsStatements) <- expression localTable assignee
     let variableType' = variableType variableAccess' localTable
     accessResult <- variableAccess localTable variableAccess' Nothing variableType' mempty
-    pure $ rhsStatements <> case accessResult of
+    lhsStatements <- case accessResult of
             {-(AST.Identifier identifier, Just accumulatedIndex, accumulatedStatements) ->
                 Vector.snoc accumulatedStatements
                     $ ArrayAssignQuadruple rhsOperand accumulatedIndex
                     $ LocalVariable identifier -}
-            (AST.Identifier identifier, Nothing, accumulatedStatements) ->
+            (identifier, _Nothing, accumulatedStatements)
-                Vector.snoc accumulatedStatements
+                -> Vector.snoc accumulatedStatements
-                    $ AssignQuadruple rhsOperand
+                . AssignQuadruple rhsOperand
-                    $ LocalVariable 0
+                <$> lookupLocal identifier
+    pure $ rhsStatements <> lhsStatements
 {- statement localTable (AST.WhileStatement whileCondition whileStatement) = do
     (conditionStatements, jumpConstructor) <- condition localTable whileCondition
     startLabel <- createLabel
@@ -135,6 +154,10 @@ createTemporary = do
         { temporaryCounter = getField @"temporaryCounter" generator + 1
         }
 
+lookupLocal :: Identifier -> Glue Variable
+lookupLocal identifier =
+    fmap (HashMap.! identifier) $ Glue $ gets $ getField @"localMap"
+
 createLabel :: Glue Label
 createLabel = do
     currentCounter <- Glue $ gets $ getField @"labelCounter"
@@ -242,13 +265,13 @@ expression localTable = \case
     (AST.DivisionExpression lhs rhs) ->
         binaryExpression DivisionQuadruple lhs rhs
     (AST.VariableExpression variableExpression) -> do
-        pure (VariableOperand (LocalVariable 0), mempty)
+        let variableType' = variableType variableExpression localTable
-        {- let variableType' = variableType variableExpression localTable
         variableAccess' <- variableAccess localTable variableExpression Nothing variableType' mempty
         case variableAccess' of
-            (AST.Identifier identifier, Nothing, statements) ->
+            (identifier, _Nothing, statements)
-                pure (VariableOperand (Variable identifier), statements)
+                -> (, statements) . VariableOperand 
-            (AST.Identifier identifier, Just operand, statements) -> do
+                <$> lookupLocal identifier
+            {-(AST.Identifier identifier, Just operand, statements) -> do
                 arrayAddress <- createTemporary
                 let arrayStatement = ArrayQuadruple (Variable identifier) operand arrayAddress
                 pure

lib/Language/Elna/RiscV/CodeGenerator.hs

@@ -114,32 +114,10 @@ quadruple StopQuadruple = pure $ Vector.fromList
     , Instruction (RiscV.BaseInstruction RiscV.OpImm $ RiscV.I RiscV.SP RiscV.ADDI RiscV.SP 4)
     , Instruction (RiscV.BaseInstruction RiscV.Jalr $ RiscV.I RiscV.RA RiscV.JALR RiscV.Zero 0)
     ]
-quadruple (AddQuadruple operand1 operand2 (Store register))
+quadruple (AddQuadruple operand1 operand2 store) =
-    | IntOperand immediateOperand1 <- operand1
+    commutativeBinary (+) RiscV.ADD (RiscV.Funct7 0b0000000) (operand1, operand2) store
-    , IntOperand immediateOperand2 <- operand2 =
+quadruple (ProductQuadruple operand1 operand2 store) =
-        pure $ lui (immediateOperand1 + immediateOperand2) register
+    commutativeBinary (*) RiscV.MUL (RiscV.Funct7 0b0000001) (operand1, operand2) store
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-        in pure $ Vector.singleton $ Instruction
-            $ RiscV.BaseInstruction RiscV.Op
-            $ RiscV.R register RiscV.ADD operandRegister1 operandRegister2 (RiscV.Funct7 0b0000000)
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        addImmediateRegister variableOperand1 immediateOperand2
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        addImmediateRegister variableOperand2 immediateOperand1
-  where
-    addImmediateRegister variableOperand immediateOperand = 
-        let statements = lui immediateOperand register
-            Store operandRegister = variableOperand
-        in pure $ Vector.snoc statements
-            $ Instruction
-            $ RiscV.BaseInstruction RiscV.Op
-            $ RiscV.R register RiscV.ADD register operandRegister
-            $ RiscV.Funct7 0b0000000
 quadruple (SubtractionQuadruple operand1 operand2 (Store register))
     | IntOperand immediateOperand1 <- operand1
     , IntOperand immediateOperand2 <- operand2 =
@@ -180,32 +158,6 @@ quadruple (NegationQuadruple operand1 (Store register))
             $ RiscV.BaseInstruction RiscV.Op
             $ RiscV.R register RiscV.SUB RiscV.Zero operandRegister1
             $ RiscV.Funct7 0b0100000
-quadruple (ProductQuadruple operand1 operand2 (Store register))
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        pure $ lui (immediateOperand1 * immediateOperand2) register
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-        in pure $ Vector.singleton $ Instruction
-            $ RiscV.BaseInstruction RiscV.Op
-            $ RiscV.R register RiscV.MUL operandRegister1 operandRegister2 (RiscV.Funct7 0b0000001)
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        multiplyImmediateRegister variableOperand1 immediateOperand2
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        multiplyImmediateRegister variableOperand2 immediateOperand1
-  where
-    multiplyImmediateRegister variableOperand immediateOperand = 
-        let statements = lui immediateOperand register
-            Store operandRegister = variableOperand
-        in pure $ Vector.snoc statements
-            $ Instruction
-            $ RiscV.BaseInstruction RiscV.Op
-            $ RiscV.R register RiscV.MUL register operandRegister
-            $ RiscV.Funct7 0b0000001
 quadruple (DivisionQuadruple operand1 operand2 (Store register))
     | IntOperand immediateOperand1 <- operand1
     , IntOperand immediateOperand2 <- operand2 =
@@ -261,198 +213,18 @@ quadruple (DivisionQuadruple operand1 operand2 (Store register))
             ]
 quadruple (LabelQuadruple (Label label)) = pure $ Vector.singleton $ JumpLabel label mempty
 quadruple (GoToQuadruple label) = pure $ Vector.singleton $ unconditionalJal label
-quadruple (EqualQuadruple operand1 operand2 goToLabel)
+quadruple (EqualQuadruple operand1 operand2 goToLabel) =
-    | IntOperand immediateOperand1 <- operand1
+    commutativeComparison (==) RiscV.BEQ (operand1, operand2) goToLabel
-    , IntOperand immediateOperand2 <- operand2 =
+quadruple (NonEqualQuadruple operand1 operand2 goToLabel) =
-        if immediateOperand1 == immediateOperand2
+    commutativeComparison (/=) RiscV.BNE (operand1, operand2) goToLabel
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
+quadruple (LessQuadruple operand1 operand2 goToLabel) =
-        else pure Vector.empty
+    lessThan (operand1, operand2) goToLabel
-    | VariableOperand variableOperand1 <- operand1
+quadruple (GreaterQuadruple operand1 operand2 goToLabel) =
-    , VariableOperand variableOperand2 <- operand2 = do
+    lessThan (operand2, operand1) goToLabel
-        let Store operandRegister1 = variableOperand1
+quadruple (LessOrEqualQuadruple operand1 operand2 goToLabel) =
-            Store operandRegister2 = variableOperand2
+    lessOrEqualThan (operand1, operand2) goToLabel
-            Label goToLabel' = goToLabel
+quadruple (GreaterOrEqualQuadruple operand1 operand2 goToLabel) =
-        pure $ Vector.singleton
+    lessOrEqualThan (operand2, operand1) goToLabel
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BEQ operandRegister1 operandRegister2
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        compareImmediateRegister variableOperand1 immediateOperand2
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        compareImmediateRegister variableOperand2 immediateOperand1
-  where
-    compareImmediateRegister variableOperand immediateOperand = 
-        let statements = lui immediateOperand immediateRegister
-            Store operandRegister = variableOperand
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BEQ operandRegister immediateRegister
-quadruple (NonEqualQuadruple operand1 operand2 goToLabel)
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        if immediateOperand1 /= immediateOperand2
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
-        else pure Vector.empty
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 = do
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        pure $ Vector.singleton
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BNE operandRegister1 operandRegister2
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        compareImmediateRegister variableOperand1 immediateOperand2
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        compareImmediateRegister variableOperand2 immediateOperand1
-  where
-    compareImmediateRegister variableOperand immediateOperand = 
-        let statements = lui immediateOperand immediateRegister
-            Store operandRegister = variableOperand
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BNE operandRegister immediateRegister
-quadruple (LessQuadruple operand1 operand2 goToLabel)
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        if immediateOperand1 < immediateOperand2
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
-        else pure Vector.empty
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 = do
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        pure $ Vector.singleton
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister1 operandRegister2
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        let statements2 = lui immediateOperand2 immediateRegister
-            Store operandRegister1 = variableOperand1
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements2
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister1 immediateRegister
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let statements1 = lui immediateOperand1 immediateRegister
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements1
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT immediateRegister operandRegister2
-quadruple (GreaterQuadruple operand1 operand2 goToLabel)
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        if immediateOperand1 > immediateOperand2
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
-        else pure Vector.empty
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 = do
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        pure $ Vector.singleton
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister2 operandRegister1
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        let statements2 = lui immediateOperand2 immediateRegister
-            Store operandRegister1 = variableOperand1
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements2
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT immediateRegister operandRegister1
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let statements1 = lui immediateOperand1 immediateRegister
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements1
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister2 immediateRegister
-quadruple (LessOrEqualQuadruple operand1 operand2 goToLabel)
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        if immediateOperand1 <= immediateOperand2
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
-        else pure Vector.empty
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 = do
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        pure $ Vector.singleton
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister2 operandRegister1
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        let statements2 = lui immediateOperand2 immediateRegister
-            Store operandRegister1 = variableOperand1
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements2
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE immediateRegister operandRegister1
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let statements1 = lui immediateOperand1 immediateRegister
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements1
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister2 immediateRegister
-quadruple (GreaterOrEqualQuadruple operand1 operand2 goToLabel)
-    | IntOperand immediateOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        if immediateOperand1 >= immediateOperand2
-        then pure $ Vector.singleton $ unconditionalJal goToLabel
-        else pure Vector.empty
-    | VariableOperand variableOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let Store operandRegister1 = variableOperand1
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-         in pure $ Vector.singleton
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister1 operandRegister2
-    | VariableOperand variableOperand1 <- operand1
-    , IntOperand immediateOperand2 <- operand2 =
-        let statements2 = lui immediateOperand2 immediateRegister
-            Store operandRegister1 = variableOperand1
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements2
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister1 immediateRegister
-    | IntOperand immediateOperand1 <- operand1
-    , VariableOperand variableOperand2 <- operand2 =
-        let statements1 = lui immediateOperand1 immediateRegister
-            Store operandRegister2 = variableOperand2
-            Label goToLabel' = goToLabel
-        in pure $ Vector.snoc statements1
-            $ Instruction
-            $ RiscV.RelocatableInstruction RiscV.Branch
-            $ RiscV.RBranch goToLabel' RiscV.BGE immediateRegister operandRegister2
 quadruple (AssignQuadruple operand1 (Store register))
     | IntOperand immediateOperand1 <- operand1 = pure
         $ lui immediateOperand1 register
@@ -489,3 +261,143 @@ lui intValue targetRegister
   where
     hi = intValue `shiftR` 12
     lo = fromIntegral intValue
+
+commutativeBinary
+    :: (Int32 -> Int32 -> Int32)
+    -> RiscV.Funct3
+    -> RiscV.Funct7
+    -> (Operand RiscVStore, Operand RiscVStore)
+    -> Store RiscV.XRegister
+    -> RiscVGenerator (Vector Statement)
+commutativeBinary immediateOperation funct3 funct7 (operand1, operand2) (Store register)
+    | IntOperand immediateOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 = pure
+        $ lui (immediateOperation immediateOperand1 immediateOperand2) register
+    | VariableOperand variableOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 =
+        let Store operandRegister1 = variableOperand1
+            Store operandRegister2 = variableOperand2
+        in pure $ Vector.singleton $ Instruction
+            $ RiscV.BaseInstruction RiscV.Op
+            $ RiscV.R register funct3 operandRegister1 operandRegister2 funct7
+    | VariableOperand variableOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        commutativeImmediateRegister variableOperand1 immediateOperand2
+    | IntOperand immediateOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 =
+        commutativeImmediateRegister variableOperand2 immediateOperand1
+  where
+    commutativeImmediateRegister variableOperand immediateOperand = 
+        let statements = lui immediateOperand register
+            Store operandRegister = variableOperand
+        in pure $ Vector.snoc statements
+            $ Instruction
+            $ RiscV.BaseInstruction RiscV.Op
+            $ RiscV.R register funct3 register operandRegister funct7
+
+commutativeComparison
+    :: (Int32 -> Int32 -> Bool)
+    -> RiscV.Funct3
+    -> (Operand RiscVStore, Operand RiscVStore)
+    -> Label
+    -> RiscVGenerator (Vector Statement)
+commutativeComparison immediateOperation funct3 (operand1, operand2) goToLabel
+    | IntOperand immediateOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        if immediateOperation immediateOperand1 immediateOperand2
+        then pure $ Vector.singleton $ unconditionalJal goToLabel
+        else pure Vector.empty
+    | VariableOperand variableOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 = do
+        let Store operandRegister1 = variableOperand1
+            Store operandRegister2 = variableOperand2
+            Label goToLabel' = goToLabel
+        pure $ Vector.singleton
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' funct3 operandRegister1 operandRegister2
+    | VariableOperand variableOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        compareImmediateRegister variableOperand1 immediateOperand2
+    | IntOperand immediateOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 =
+        compareImmediateRegister variableOperand2 immediateOperand1
+  where
+    compareImmediateRegister variableOperand immediateOperand = 
+        let statements = lui immediateOperand immediateRegister
+            Store operandRegister = variableOperand
+            Label goToLabel' = goToLabel
+        in pure $ Vector.snoc statements
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' funct3 operandRegister immediateRegister
+
+lessThan :: (Operand RiscVStore, Operand RiscVStore) -> Label -> RiscVGenerator (Vector Statement)
+lessThan (operand1, operand2) goToLabel
+    | IntOperand immediateOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        if immediateOperand1 < immediateOperand2
+        then pure $ Vector.singleton $ unconditionalJal goToLabel
+        else pure Vector.empty
+    | VariableOperand variableOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 = do
+        let Store operandRegister1 = variableOperand1
+            Store operandRegister2 = variableOperand2
+            Label goToLabel' = goToLabel
+        pure $ Vector.singleton
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister1 operandRegister2
+    | VariableOperand variableOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        let statements2 = lui immediateOperand2 immediateRegister
+            Store operandRegister1 = variableOperand1
+            Label goToLabel' = goToLabel
+        in pure $ Vector.snoc statements2
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BLT operandRegister1 immediateRegister
+    | IntOperand immediateOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 =
+        let statements1 = lui immediateOperand1 immediateRegister
+            Store operandRegister2 = variableOperand2
+            Label goToLabel' = goToLabel
+        in pure $ Vector.snoc statements1
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BLT immediateRegister operandRegister2
+
+lessOrEqualThan :: (Operand RiscVStore, Operand RiscVStore) -> Label -> RiscVGenerator (Vector Statement)
+lessOrEqualThan (operand1, operand2) goToLabel
+    | IntOperand immediateOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        if immediateOperand1 <= immediateOperand2
+        then pure $ Vector.singleton $ unconditionalJal goToLabel
+        else pure Vector.empty
+    | VariableOperand variableOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 = do
+        let Store operandRegister1 = variableOperand1
+            Store operandRegister2 = variableOperand2
+            Label goToLabel' = goToLabel
+        pure $ Vector.singleton
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister2 operandRegister1
+    | VariableOperand variableOperand1 <- operand1
+    , IntOperand immediateOperand2 <- operand2 =
+        let statements2 = lui immediateOperand2 immediateRegister
+            Store operandRegister1 = variableOperand1
+            Label goToLabel' = goToLabel
+        in pure $ Vector.snoc statements2
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BGE immediateRegister operandRegister1
+    | IntOperand immediateOperand1 <- operand1
+    , VariableOperand variableOperand2 <- operand2 =
+        let statements1 = lui immediateOperand1 immediateRegister
+            Store operandRegister2 = variableOperand2
+            Label goToLabel' = goToLabel
+        in pure $ Vector.snoc statements1
+            $ Instruction
+            $ RiscV.RelocatableInstruction RiscV.Branch
+            $ RiscV.RBranch goToLabel' RiscV.BGE operandRegister2 immediateRegister