Make isRepr work on TypedThings instead of CoreExpr.

[matthijs/master-project/cλash.git] / cλash / CLasH / Normalize.hs

diff --git a/cλash/CLasH/Normalize.hs b/cλash/CLasH/Normalize.hs
index 4366949a524cb6bbb28e0a84baad08cb8e214fc7..38ee353ac4225fe49dc3b8e85c7c248de7f66f6e 100644 (file)
--- a/cλash/CLasH/Normalize.hs
+++ b/cλash/CLasH/Normalize.hs
@@ -323,7 +323,7 @@ inlinenonreptop = everywhere ("inlinenonrep", inlinebind ((Monad.liftM not) . is
 inlinetoplevel, inlinetopleveltop :: Transform
 -- Any system name is candidate for inlining. Never inline user-defined
 -- functions, to preserver structure.
-inlinetoplevel expr@(Var f) | (Name.isSystemName . Id.idName) f = do
+inlinetoplevel expr@(Var f) | not $ isUserDefined f = do
   -- See if this is a top level binding for which we have a body
   body_maybe <- Trans.lift $ getGlobalBind f
   case body_maybe of
@@ -343,9 +343,13 @@ inlinetoplevel expr = return expr
 inlinetopleveltop = everywhere ("inlinetoplevel", inlinetoplevel)
 
 needsInline :: CoreExpr -> Bool
--- Any function that just evaluates to another function, can be inlined
---needsInline (Var f) = True
-needsInline _ = False
+needsInline expr = case splitNormalized expr of
+  -- Inline any function that only has a single definition, it is probably
+  -- simple enough. This might inline some stuff that it shouldn't though it
+  -- will never inline user-defined functions (inlinetoplevel only tries
+  -- system names) and inlining should never break things.
+  (args, [bind], res) -> True
+  _ -> False
 
 --------------------------------
 -- Scrutinee simplification
@@ -423,7 +427,7 @@ casesimpl expr@(Case scrut b ty alts) = do
       -- binding containing a case expression.
       dobndr :: CoreBndr -> Int -> TransformMonad (CoreBndr, Maybe (CoreBndr, CoreExpr))
       dobndr b i = do
-        repr <- isRepr (Var b)
+        repr <- isRepr b
         -- Is b wild (e.g., not a free var of expr. Since b is only in scope
         -- in expr, this means that b is unused if expr does not use it.)
         let wild = not (VarSet.elemVarSet b free_vars)
@@ -637,6 +641,25 @@ funextract expr = return expr
 -- Perform this transform everywhere
 funextracttop = everywhere ("funextract", funextract)
 
+--------------------------------
+-- Ensure that a function that just returns another function (or rather,
+-- another top-level binder) is still properly normalized. This is a temporary
+-- solution, we should probably integrate this pass with lambdasimpl and
+-- letsimpl instead.
+--------------------------------
+simplrestop expr@(Lam _ _) = return expr
+simplrestop expr@(Let _ _) = return expr
+simplrestop expr = do
+  local_var <- Trans.lift $ is_local_var expr
+  -- Don't extract values that are not representable, to prevent loops with
+  -- inlinenonrep
+  repr <- isRepr expr
+  if local_var || not repr
+    then
+      return expr
+    else do
+      id <- Trans.lift $ mkBinderFor expr "res" 
+      change $ Let (NonRec id expr) (Var id)
 --------------------------------
 -- End of transformations
 --------------------------------
@@ -645,7 +668,7 @@ funextracttop = everywhere ("funextract", funextract)
 
 
 -- What transforms to run?
-transforms = [inlinetopleveltop, argproptop, funextracttop, etatop, betatop, castproptop, letremovesimpletop, letderectop, letremovetop, letsimpltop, letflattop, scrutsimpltop, casesimpltop, caseremovetop, inlinenonreptop, appsimpltop, letremoveunusedtop, castsimpltop, lambdasimpltop]
+transforms = [inlinetopleveltop, argproptop, funextracttop, etatop, betatop, castproptop, letremovesimpletop, letderectop, letremovetop, letsimpltop, letflattop, scrutsimpltop, casesimpltop, caseremovetop, inlinenonreptop, appsimpltop, letremoveunusedtop, castsimpltop, lambdasimpltop, simplrestop]
 
 -- | Returns the normalized version of the given function.
 getNormalized ::