X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=c%CE%BBash%2FCLasH%2FNormalize.hs;h=75ab7380f0bca63f40bac1c4f423ef356e8c2c19;hb=9ebf03351aaec723053b7911aac922fbf2417756;hp=2b5c8999147c03662ff5bf806cab27af9e992ff3;hpb=74c1f82bd035a57c9df445d803644fb338b32120;p=matthijs%2Fmaster-project%2Fc%CE%BBash.git

diff --git "a/c\316\273ash/CLasH/Normalize.hs" "b/c\316\273ash/CLasH/Normalize.hs"
index 2b5c899..75ab738 100644
--- "a/c\316\273ash/CLasH/Normalize.hs"
+++ "b/c\316\273ash/CLasH/Normalize.hs"
@@ -158,26 +158,14 @@ retvalsimpltop = everywhere ("retvalsimpl", retvalsimpl)
 --------------------------------
 -- let derecursification
 --------------------------------
-letderec, letderectop :: Transform
-letderec c expr@(Let (Rec binds) res) = case liftable of
-  -- Nothing is liftable, just return
-  [] -> return expr
-  -- Something can be lifted, generate a new let expression
-  _ -> change $ mkNonRecLets liftable (Let (Rec nonliftable) res)
-  where
-    -- Make a list of all the binders bound in this recursive let
-    bndrs = map fst binds
-    -- See which bindings are liftable
-    (liftable, nonliftable) = List.partition canlift binds
-    -- Any expression that does not use any of the binders in this recursive let
-    -- can be lifted into a nonrec let. It can't use its own binder either,
-    -- since that would mean the binding is self-recursive and should be in a
-    -- single bind recursive let.
-    canlift (bndr, e) = not $ expr_uses_binders bndrs e
+letrec, letrectop :: Transform
+letrec c expr@(Let (NonRec bndr val) res) = 
+  change $ Let (Rec [(bndr, val)]) res
+
 -- Leave all other expressions unchanged
-letderec c expr = return expr
+letrec c expr = return expr
 -- Perform this transform everywhere
-letderectop = everywhere ("letderec", letderec)
+letrectop = everywhere ("letrec", letrec)
 
 --------------------------------
 -- let flattening
@@ -805,7 +793,7 @@ funextracttop = everywhere ("funextract", funextract)
 
 
 -- What transforms to run?
-transforms = [inlinedicttop, inlinetopleveltop, classopresolutiontop, argproptop, funextracttop, etatop, betatop, castproptop, letremovesimpletop, letderectop, letremovetop, retvalsimpltop, letflattop, scrutsimpltop, scrutbndrremovetop, casesimpltop, caseremovetop, inlinenonreptop, appsimpltop, letremoveunusedtop, castsimpltop]
+transforms = [inlinedicttop, inlinetopleveltop, classopresolutiontop, argproptop, funextracttop, etatop, betatop, castproptop, letremovesimpletop, letrectop, letremovetop, retvalsimpltop, letflattop, scrutsimpltop, scrutbndrremovetop, casesimpltop, caseremovetop, inlinenonreptop, appsimpltop, letremoveunusedtop, castsimpltop]
 
 -- | Returns the normalized version of the given function, or an error
 -- if it is not a known global binder.
@@ -856,9 +844,9 @@ normalizeExpr what expr = do
       trace (what ++ " before normalization:\n\n" ++ showSDoc ( ppr expr_uniqued ) ++ "\n") $ return ()
       expr' <- dotransforms transforms expr_uniqued
       endcount <- MonadState.get tsTransformCounter 
-      trace ("\n" ++ what ++ " after normalization:\n\n" ++ showSDoc ( ppr expr')) $ return ()
-      trace ("\nNeeded " ++ show (endcount - startcount) ++ " transformations to normalize " ++ what) $ return ()
-      return expr'
+      trace ("\n" ++ what ++ " after normalization:\n\n" ++ showSDoc ( ppr expr')
+             ++ "\nNeeded " ++ show (endcount - startcount) ++ " transformations to normalize " ++ what) $
+       return expr'
 
 -- | Split a normalized expression into the argument binders, top level
 --   bindings and the result binder.