Add comment to DEFAULT alternative simplification

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

diff --git a/clash/CLasH/Normalize.hs b/clash/CLasH/Normalize.hs
index 89f21c00ef0ecf83661a8a6248b5ae6b758d69d4..2778aa22057250a10ed65f92fb3d818495c5181e 100644 (file)
--- a/clash/CLasH/Normalize.hs
+++ b/clash/CLasH/Normalize.hs
@@ -493,6 +493,8 @@ casesimpl c expr@(Case scrut bndr ty alts) | not bndr_used = do
   doalt alt@(DEFAULT, [], expr) = do
     local_var <- Trans.lift $ is_local_var expr
     repr <- isRepr expr
+    -- Extract any expressions that is not a local var already and is 
+    -- representable (to prevent loops with inlinenonrep).
     (exprbinding_maybe, expr') <- if (not local_var) && repr
       then do
         id <- Trans.lift $ mkBinderFor expr "caseval"