Repository : ssh://darcs.haskell.org//srv/darcs/ghc

On branch  : supercompiler

http://hackage.haskell.org/trac/ghc/changeset/235e966e3b55f5869271eabbf9a59ae2866a1270

>---------------------------------------------------------------

commit 235e966e3b55f5869271eabbf9a59ae2866a1270
Author: Max Bolingbroke <batterseapo...@hotmail.com>
Date:   Wed Jan 18 17:07:40 2012 +0000

    Put positive information propagation under Staticflags control and turn it 
off

>---------------------------------------------------------------

 compiler/supercompile/Supercompile/Drive/Split.hs |    3 ++-
 compiler/supercompile/Supercompile/StaticFlags.hs |    8 ++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/compiler/supercompile/Supercompile/Drive/Split.hs 
b/compiler/supercompile/Supercompile/Drive/Split.hs
index aa1c213..8963c04 100644
--- a/compiler/supercompile/Supercompile/Drive/Split.hs
+++ b/compiler/supercompile/Supercompile/Drive/Split.hs
@@ -1103,7 +1103,8 @@ splitStackFrame ctxt_ids ids kf scruts bracketed_hole
             -- ===>
             --  case x of C -> let unk = C; z = C in ...
             alt_in_es = alt_rns `zip` alt_es
-            alt_hs = zipWith3Equal "alt_hs" (\alt_rn alt_con alt_bvs -> 
M.fromList (do Just scrut_v <- [altConToValue (idType x') (alt_rn, alt_con)]
+            alt_hs = zipWith3Equal "alt_hs" (\alt_rn alt_con alt_bvs -> 
M.fromList (do guard pOSITIVE_INFORMATION
+                                                                               
        Just scrut_v <- [altConToValue (idType x') (alt_rn, alt_con)]
                                                                                
        let in_scrut_e@(_, scrut_e) = renamedTerm (fmap Value scrut_v)
                                                                                
        scrut <- scruts'
                                                                                
        return (scrut, HB (howToBindCheap scrut_e) (Right in_scrut_e)))
diff --git a/compiler/supercompile/Supercompile/StaticFlags.hs 
b/compiler/supercompile/Supercompile/StaticFlags.hs
index 28b15e8..5d7dbb9 100644
--- a/compiler/supercompile/Supercompile/StaticFlags.hs
+++ b/compiler/supercompile/Supercompile/StaticFlags.hs
@@ -39,8 +39,12 @@ bOUND_STEPS = "--bound-steps" `elem` aRGS
 
 -- For debugging very long-running supercompilation
 dEPTH_LIIMT :: Maybe Int
---dEPTH_LIIMT = Nothing
-dEPTH_LIIMT = Just 10
+dEPTH_LIIMT = Nothing
+--dEPTH_LIIMT = Just 10
+
+pOSITIVE_INFORMATION :: Bool
+pOSITIVE_INFORMATION = False
+--pOSITIVE_INFORMATION = True
 
 data DeedsPolicy = FCFS | Proportional
                  deriving (Read)



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