[project @ 2000-12-01 13:42:52 by simonpj]

[ghc-hetmet.git] / ghc / compiler / simplCore / CSE.lhs

diff --git a/ghc/compiler/simplCore/CSE.lhs b/ghc/compiler/simplCore/CSE.lhs
index b2e124a..69b35be 100644 (file)
--- a/ghc/compiler/simplCore/CSE.lhs
+++ b/ghc/compiler/simplCore/CSE.lhs
@@ -14,12 +14,12 @@ import CmdLineOpts  ( DynFlag(..), DynFlags, dopt )
 import Id              ( Id, idType )
 import CoreUtils       ( hashExpr, cheapEqExpr, exprIsBig, mkAltExpr )
 import DataCon         ( isUnboxedTupleCon )
-import Type            ( splitTyConApp_maybe )
+import Type            ( tyConAppArgs )
 import Subst           ( InScopeSet, uniqAway, emptyInScopeSet, 
                          extendInScopeSet, elemInScopeSet )
 import CoreSyn
 import VarEnv  
-import CoreLint                ( beginPass, endPass )
+import CoreLint                ( showPass, endPass )
 import Outputable
 import Util            ( mapAccumL )
 import UniqFM
@@ -107,7 +107,7 @@ cseProgram :: DynFlags -> [CoreBind] -> IO [CoreBind]
 
 cseProgram dflags binds
   = do {
-       beginPass dflags "Common sub-expression";
+       showPass dflags "Common sub-expression";
        let { binds' = cseBinds emptyCSEnv binds };
        endPass dflags "Common sub-expression" 
                (dopt Opt_D_dump_cse dflags || dopt Opt_D_verbose_core2core dflags)
@@ -170,9 +170,7 @@ cseAlts env scrut' bndr bndr' alts
                other ->  (bndr', extendCSEnv env bndr' scrut') -- See "yet another wrinkle"
                                                                -- map: scrut' -> bndr'
 
-    arg_tys = case splitTyConApp_maybe (idType bndr) of
-               Just (_, arg_tys) -> arg_tys
-               other             -> pprPanic "cseAlts" (ppr bndr)
+    arg_tys = tyConAppArgs (idType bndr)
 
     cse_alt (DataAlt con, args, rhs)
        | not (null args || isUnboxedTupleCon con)