Substantial improvements to coercion optimisation

[ghc-hetmet.git] / compiler / cmm / ZipDataflow.hs

diff --git a/compiler/cmm/ZipDataflow.hs b/compiler/cmm/ZipDataflow.hs
index 39a4798..ba8e75a 100644 (file)
--- a/compiler/cmm/ZipDataflow.hs
+++ b/compiler/cmm/ZipDataflow.hs
@@ -29,10 +29,8 @@ import qualified ZipCfg as G
 
 import Maybes
 import Outputable
-import Panic
 
 import Control.Monad
-import Maybe
 
 {- 
 
@@ -505,7 +503,7 @@ forward_sol check_maybe = forw
   forw rewrite name start_facts transfers rewrites =
    let anal_f :: DFM a b -> a -> Graph m l -> DFM a b
        anal_f finish in' g =
-           do { fwd_pure_anal name emptyBlockEnv transfers in' g; finish }
+           do { _ <- fwd_pure_anal name emptyBlockEnv transfers in' g; finish }
 
        solve :: DFM a b -> a -> Graph m l -> Fuel -> DFM a (b, Fuel)
        solve finish in_fact (Graph entry blockenv) fuel =
@@ -572,7 +570,7 @@ mk_set_or_save :: (DataflowAnalysis df, Monad (df a), Outputable a) =>
                   (BlockId -> Bool) -> LastOutFacts a -> df a ()
 mk_set_or_save is_local (LastOutFacts l) = mapM_ set_or_save_one l
     where set_or_save_one (id, a) =
-              if is_local id then setFact id a else pprTrace "addLastOutFact" (ppr $ length l) $ addLastOutFact (id, a)
+              if is_local id then setFact id a else addLastOutFact (id, a)
 
 
 
@@ -609,7 +607,7 @@ forward_rew check_maybe = forw
            in_fact `seq` g `seq`
             let Graph entry blockenv = g
                 blocks = G.postorder_dfs_from blockenv entry
-            in do { solve depth name start transfers rewrites in_fact g fuel
+            in do { _ <- solve depth name start transfers rewrites in_fact g fuel
                   ; eid <- freshBlockId "temporary entry id"
                   ; (rewritten, fuel) <-
                       rew_tail (ZFirst eid) in_fact entry emptyBlockEnv fuel
@@ -618,7 +616,7 @@ forward_rew check_maybe = forw
                   ; return (a, lgraphToGraph (LGraph eid rewritten), fuel)
                   }
           don't_rewrite facts finish in_fact g fuel =
-              do  { solve depth name facts transfers rewrites in_fact g fuel
+              do  { _ <- solve depth name facts transfers rewrites in_fact g fuel
                   ; a <- finish
                   ; return (a, g, fuel)
                   }
@@ -684,8 +682,8 @@ forward_rew check_maybe = forw
           either_last rewrites in' (LastOther l) = fr_last rewrites l in'
           check_facts in' (LastOther l) =
             let LastOutFacts last_outs = ft_last_outs transfers l in'
-            in mapM (uncurry checkFactMatch) last_outs
-          check_facts _ LastExit = return []
+            in mapM_ (uncurry checkFactMatch) last_outs
+          check_facts _ LastExit = return ()
       in  fixed_pt_and_fuel
 
 lastOutFacts :: DFM f (LastOutFacts f)
@@ -781,7 +779,7 @@ backward_sol check_maybe = back
                                      my_trace "analysis rewrites last node"
                                       (ppr l <+> pprGraph g') $
                                       subsolve g exit_fact fuel
-                    ; set_head_fact h a fuel
+                    ; _ <- set_head_fact h a fuel
                     ; return fuel }
 
          in do { fuel <- run "backward" name set_block_fact blocks fuel
@@ -982,7 +980,7 @@ instance FixedPoint ForwardFixedPoint where
 
 
 dump_things :: Bool
-dump_things = True
+dump_things = False
 
 my_trace :: String -> SDoc -> a -> a
 my_trace = if dump_things then pprTrace else \_ _ a -> a