[project @ 2000-10-17 11:34:46 by sewardj]

[ghc-hetmet.git] / ghc / compiler / codeGen / CgCase.lhs

diff --git a/ghc/compiler/codeGen/CgCase.lhs b/ghc/compiler/codeGen/CgCase.lhs
index 339569b..481ef02 100644 (file)
--- a/ghc/compiler/codeGen/CgCase.lhs
+++ b/ghc/compiler/codeGen/CgCase.lhs
@@ -1,7 +1,7 @@
 %
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-% $Id: CgCase.lhs,v 1.44 2000/07/14 08:14:53 simonpj Exp $
+% $Id: CgCase.lhs,v 1.46 2000/09/06 12:21:15 simonmar Exp $
 %
 %********************************************************
 %*                                                     *
@@ -61,7 +61,7 @@ import TyCon          ( TyCon, isEnumerationTyCon, isUnboxedTupleTyCon,
                        )
 import Type            ( Type, typePrimRep, splitAlgTyConApp, 
                          splitTyConApp_maybe, repType )
-import Unique           ( Unique, Uniquable(..), mkPseudoUnique1 )
+import Unique           ( Unique, Uniquable(..), newTagUnique )
 import Maybes          ( maybeToBool )
 import Util
 import Outputable
@@ -143,9 +143,10 @@ alternatives (in which case we lookup the tag in the relevant closure
 table to get the closure).
 
 Being a bit short of uniques for temporary variables here, we use
-mkPseudoUnique1 to generate a temporary for the tag.  We can't use
-mkBuiltinUnique, because that occasionally clashes with some
-temporaries generated for _ccall_GC, amongst others (see CgExpr.lhs).
+newTagUnique to generate a new unique from the case binder.  The case
+binder's unique will presumably have the 'c' tag (generated by
+CoreToStg), so we just change its tag to 'C' (for 'case') to ensure it
+doesn't clash with anything else.
 
 \begin{code}
 cgCase (StgPrimApp op args res_ty)
@@ -155,7 +156,7 @@ cgCase (StgPrimApp op args res_ty)
 
     let tag_amode = case op of 
                        TagToEnumOp -> only arg_amodes
-                       _ -> CTemp (mkPseudoUnique1{-see above-} 1) IntRep
+                       _ -> CTemp (newTagUnique (getUnique bndr) 'C') IntRep
 
        closure = CVal (CIndex (CLbl (mkClosureTblLabel tycon) PtrRep) tag_amode PtrRep) PtrRep
     in
@@ -946,7 +947,7 @@ mkReturnVector uniq tagged_alt_absCs deflt_absC srt liveness ret_conv
     deflt_lbl = 
        case nonemptyAbsC deflt_absC of
                 -- the simplifier might have eliminated a case
-          Nothing -> CLbl mkErrorStdEntryLabel CodePtrRep 
+          Nothing -> mkIntCLit 0 -- CLbl mkErrorStdEntryLabel CodePtrRep 
           Just absC@(CCodeBlock lbl _) -> CLbl lbl CodePtrRep
 
     mk_vector_entry :: ConTag -> (CAddrMode, AbstractC)