-- Standard modules
import qualified Data.Monoid as Monoid
+import qualified Data.Either as Either
import qualified Control.Monad as Monad
import qualified Control.Monad.Trans.Writer as Writer
import qualified "transformers" Control.Monad.Trans as Trans
if Monoid.getAny $
-- trace ("Trying to apply transform " ++ name ++ " to:\n" ++ showSDoc (nest 4 $ ppr expr') ++ "\nType: \n" ++ (showSDoc $ nest 4 $ ppr $ CoreUtils.exprType expr') ++ "\n")
changed
- then
+ then
-- trace ("Applying transform " ++ name ++ " to:\n" ++ showSDoc (nest 4 $ ppr expr') ++ "\nType: \n" ++ (showSDoc $ nest 4 $ ppr $ CoreUtils.exprType expr') ++ "\n"
+ -- ++ "Context: " ++ show context ++ "\n"
-- ++ "Result of applying " ++ name ++ ":\n" ++ showSDoc (nest 4 $ ppr expr'') ++ "\n" ++ "Type: \n" ++ (showSDoc $ nest 4 $ ppr $ CoreUtils.exprType expr'') ++ "\n" ) $
- applyboth first (name, second) context expr''
+ do
+ Trans.lift $ MonadState.modify tsTransformCounter (+1)
+ applyboth first (name, second) context expr''
else
-- trace ("No changes") $
return expr''
return $ App a' b'
subeverywhere trans c (Let (NonRec b bexpr) expr) = do
- bexpr' <- trans (Other:c) bexpr
- expr' <- trans (Other:c) expr
+ bexpr' <- trans (LetBinding:c) bexpr
+ expr' <- trans (LetBody:c) expr
return $ Let (NonRec b bexpr') expr'
subeverywhere trans c (Let (Rec binds) expr) = do
- expr' <- trans (Other:c) expr
+ expr' <- trans (LetBody:c) expr
binds' <- mapM transbind binds
return $ Let (Rec binds') expr'
where
transbind :: (CoreBndr, CoreExpr) -> TransformMonad (CoreBndr, CoreExpr)
transbind (b, e) = do
- e' <- trans (Other:c) e
+ e' <- trans (LetBinding:c) e
return (b, e')
subeverywhere trans c (Lam x expr) = do
- expr' <- trans (Other:c) expr
+ expr' <- trans (LambdaBody:c) expr
return $ Lam x expr'
subeverywhere trans c (Case scrut b t alts) = do
subeverywhere trans c expr = error $ "\nNormalizeTools.subeverywhere: Unsupported expression: " ++ show expr
--- Apply the given transformation to all expressions, except for direct
--- arguments of an application
-notappargs :: (String, Transform) -> Transform
-notappargs trans = applyboth (subnotappargs trans) trans
-
--- Apply the given transformation to all (direct and indirect) subexpressions
--- (but not the expression itself), except for direct arguments of an
--- application
-subnotappargs :: (String, Transform) -> Transform
-subnotappargs trans c (App a b) = do
- a' <- subnotappargs trans (Other:c) a
- b' <- subnotappargs trans (Other:c) b
- return $ App a' b'
-
--- Let subeverywhere handle all other expressions
-subnotappargs trans c expr = subeverywhere (notappargs trans) c expr
-
-- Runs each of the transforms repeatedly inside the State monad.
-dotransforms :: [Transform] -> CoreExpr -> TranslatorSession CoreExpr
+dotransforms :: [(String, Transform)] -> CoreExpr -> TranslatorSession CoreExpr
dotransforms transs expr = do
- (expr', changed) <- Writer.runWriterT $ Monad.foldM (\e trans -> trans [] e) expr transs
+ (expr', changed) <- Writer.runWriterT $ Monad.foldM (\e trans -> everywhere trans [] e) expr transs
if Monoid.getAny changed then dotransforms transs expr' else return expr'
-- Inline all let bindings that satisfy the given condition
inlinebind :: ((CoreBndr, CoreExpr) -> TransformMonad Bool) -> Transform
-inlinebind condition context expr@(Let (NonRec bndr expr') res) = do
- applies <- condition (bndr, expr')
- if applies
- then do
- -- Substitute the binding in res and return that
- res' <- substitute_clone bndr expr' context res
- change res'
- else
- -- Don't change this let
- return expr
+inlinebind condition context expr@(Let (Rec binds) res) = do
+ -- Find all bindings that adhere to the condition
+ res_eithers <- mapM docond binds
+ case Either.partitionEithers res_eithers of
+ -- No replaces? No change
+ ([], _) -> return expr
+ (replace, others) -> do
+ -- Substitute the to be replaced binders with their expression
+ newexpr <- do_substitute replace (Let (Rec others) res)
+ change newexpr
+ where
+ -- Apply the condition to a let binding and return an Either
+ -- depending on whether it needs to be inlined or not.
+ docond :: (CoreBndr, CoreExpr) -> TransformMonad (Either (CoreBndr, CoreExpr) (CoreBndr, CoreExpr))
+ docond b = do
+ res <- condition b
+ return $ case res of True -> Left b; False -> Right b
+
+ -- Apply the given list of substitutions to the the given expression
+ do_substitute :: [(CoreBndr, CoreExpr)] -> CoreExpr -> TransformMonad CoreExpr
+ do_substitute [] expr = return expr
+ do_substitute ((bndr, val):reps) expr = do
+ -- Perform this substitution in the expression
+ expr' <- substitute_clone bndr val context expr
+ -- And in the substitution values we will be using next
+ reps' <- mapM (subs_bind bndr val) reps
+ -- And then perform the remaining substitutions
+ do_substitute reps' expr'
+
+ -- Replace the given binder with the given expression in the
+ -- expression oft the given let binding
+ subs_bind :: CoreBndr -> CoreExpr -> (CoreBndr, CoreExpr) -> TransformMonad (CoreBndr, CoreExpr)
+ subs_bind bndr expr (b, v) = do
+ v' <- substitute_clone bndr expr (LetBinding:context) v
+ return (b, v')
+
+
-- Leave all other expressions unchanged
inlinebind _ context expr = return expr
where
str = Name.getOccString bndr
--- Is the given binder normalizable? This means that its type signature can be
+-- | Is the given binder normalizable? This means that its type signature can be
-- represented in hardware, which should (?) guarantee that it can be made
--- into hardware. Note that if a binder is not normalizable, it might become
--- so using argument propagation.
-isNormalizeable :: CoreBndr -> TransformMonad Bool
-isNormalizeable bndr = Trans.lift (isNormalizeable' bndr)
-
-isNormalizeable' :: CoreBndr -> TranslatorSession Bool
-isNormalizeable' bndr = do
+-- into hardware. This checks whether all the arguments and (optionally)
+-- the return value are
+-- representable.
+isNormalizeable ::
+ Bool -- ^ Allow the result to be unrepresentable?
+ -> CoreBndr -- ^ The binder to check
+ -> TranslatorSession Bool -- ^ Is it normalizeable?
+isNormalizeable result_nonrep bndr = do
let ty = Id.idType bndr
let (arg_tys, res_ty) = Type.splitFunTys ty
- -- This function is normalizable if all its arguments and return value are
- -- representable.
- andM $ mapM isRepr' (res_ty:arg_tys)
+ let check_tys = if result_nonrep then arg_tys else (res_ty:arg_tys)
+ andM $ mapM isRepr' check_tys
projects / matthijs / master-project / cλash.git / blobdiff