X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FCmmProcPoint.hs;h=de8cfa378b3e5d6379e3317a485cd69b28dec3b9;hb=c6206fd81612e51e257a650390646421c7c1d1cb;hp=fe64608022fb1ab3ea450a35975ff27063a0918a;hpb=55f8b001f06d0a2a1e9b0e84cbaa5f2f109270df;p=ghc-hetmet.git

diff --git a/compiler/cmm/CmmProcPoint.hs b/compiler/cmm/CmmProcPoint.hs
index fe64608..de8cfa3 100644
--- a/compiler/cmm/CmmProcPoint.hs
+++ b/compiler/cmm/CmmProcPoint.hs
@@ -4,12 +4,11 @@ module CmmProcPoint (
 
 #include "HsVersions.h"
 
-import Cmm
+import BlockId
 import CmmBrokenBlock
 import Dataflow
 
 import UniqSet
-import UniqFM
 import Panic
 
 -- Determine the proc points for a set of basic blocks.
@@ -77,21 +76,25 @@ calculateNewProcPoints  owners block =
             then unitUniqSet child_id
             else emptyUniqSet
           where
-            parent_owners = lookupWithDefaultUFM owners emptyUniqSet parent_id
-            child_owners = lookupWithDefaultUFM owners emptyUniqSet child_id
-            needs_proc_point = not $ isEmptyUniqSet $
-                               child_owners `minusUniqSet` parent_owners
+            parent_owners = lookupWithDefaultBEnv owners emptyUniqSet parent_id
+            child_owners = lookupWithDefaultBEnv owners emptyUniqSet child_id
+            needs_proc_point =
+                -- only if parent isn't dead
+                (not $ isEmptyUniqSet parent_owners) &&
+                -- and only if child has more owners than parent
+                (not $ isEmptyUniqSet $
+                     child_owners `minusUniqSet` parent_owners)
 
 calculateOwnership :: BlockEnv BrokenBlock
                    -> UniqSet BlockId
                    -> [BrokenBlock]
                    -> BlockEnv (UniqSet BlockId)
 calculateOwnership blocks_ufm proc_points blocks =
-    fixedpoint dependants update (map brokenBlockId blocks) emptyUFM
+    fixedpoint dependants update (map brokenBlockId blocks) emptyBlockEnv
     where
       dependants :: BlockId -> [BlockId]
       dependants ident =
-          brokenBlockTargets $ lookupWithDefaultUFM
+          brokenBlockTargets $ lookupWithDefaultBEnv
                                  blocks_ufm unknown_block ident
 
       update :: BlockId
@@ -101,16 +104,16 @@ calculateOwnership blocks_ufm proc_points blocks =
       update ident cause owners =
           case (cause, ident `elementOfUniqSet` proc_points) of
             (Nothing, True) ->
-                Just $ addToUFM owners ident (unitUniqSet ident)
+                Just $ extendBlockEnv owners ident (unitUniqSet ident)
             (Nothing, False) -> Nothing
-            (Just cause', True) -> Nothing
+            (Just _,      True) -> Nothing
             (Just cause', False) ->
                 if (sizeUniqSet old) == (sizeUniqSet new)
                    then Nothing
-                   else Just $ addToUFM owners ident new
+                   else Just $ extendBlockEnv owners ident new
                 where
-                  old = lookupWithDefaultUFM owners emptyUniqSet ident
+                  old = lookupWithDefaultBEnv owners emptyUniqSet ident
                   new = old `unionUniqSets`
-                        lookupWithDefaultUFM owners emptyUniqSet cause'
+                        lookupWithDefaultBEnv owners emptyUniqSet cause'
 
       unknown_block = panic "unknown BlockId in calculateOwnership"