Rename isNopSig to isTopSig

to be consistent with the other uses of nop vs. top in Demand.hs. Also,
stop prettyprinting top strictness signatures in Core dumps.

compiler/basicTypes/Demand.hs

@@ -37,7 +37,7 @@ module Demand (
         appIsBottom, isBottomingSig, pprIfaceStrictSig,
         trimCPRInfo, returnsCPR_maybe,
         StrictSig(..), mkStrictSig, mkClosedStrictSig, nopSig, botSig, cprProdSig,
-        isNopSig, splitStrictSig, increaseStrictSigArity,
+        isTopSig, splitStrictSig, increaseStrictSigArity,
 
         seqDemand, seqDemandList, seqDmdType, seqStrictSig,
 
@@ -1262,10 +1262,10 @@ cprProdDmdType :: Arity -> DmdType
 cprProdDmdType arity
   = DmdType emptyDmdEnv [] (vanillaCprProdRes arity)
 
-isNopDmdType :: DmdType -> Bool
-isNopDmdType (DmdType env [] res)
+isTopDmdType :: DmdType -> Bool
+isTopDmdType (DmdType env [] res)
   | isTopRes res && isEmptyVarEnv env = True
-isNopDmdType _                        = False
+isTopDmdType _                        = False
 
 mkDmdType :: DmdEnv -> [Demand] -> DmdResult -> DmdType
 mkDmdType fv ds res = DmdType fv ds res
@@ -1669,8 +1669,8 @@ increaseStrictSigArity :: Int -> StrictSig -> StrictSig
 increaseStrictSigArity arity_increase (StrictSig (DmdType env dmds res))
   = StrictSig (DmdType env (replicate arity_increase topDmd ++ dmds) res)
 
-isNopSig :: StrictSig -> Bool
-isNopSig (StrictSig ty) = isNopDmdType ty
+isTopSig :: StrictSig -> Bool
+isTopSig (StrictSig ty) = isTopDmdType ty
 
 isBottomingSig :: StrictSig -> Bool
 -- True if the signature diverges or throws an exception

compiler/coreSyn/CoreArity.hs

@@ -711,7 +711,7 @@ arityType env (Cast e co)
 
 arityType _ (Var v)
   | strict_sig <- idStrictness v
-  , not $ isNopSig strict_sig
+  , not $ isTopSig strict_sig
   , (ds, res) <- splitStrictSig strict_sig
   , let arity = length ds
   = if isBotRes res then ABot arity

compiler/coreSyn/PprCore.hs

@@ -400,7 +400,7 @@ ppIdInfo id info
     , (has_arity,        text "Arity=" <> int arity)
     , (has_called_arity, text "CallArity=" <> int called_arity)
     , (has_caf_info,     text "Caf=" <> ppr caf_info)
-    , (True,             text "Str=" <> pprStrictness str_info)
+    , (has_str_info,     text "Str=" <> pprStrictness str_info)
     , (has_unf,          text "Unf=" <> ppr unf_info)
     , (not (null rules), text "RULES:" <+> vcat (map pprRule rules))
     ]   -- Inline pragma, occ, demand, one-shot info
@@ -421,6 +421,7 @@ ppIdInfo id info
     has_caf_info = not (mayHaveCafRefs caf_info)
 
     str_info = strictnessInfo info
+    has_str_info = not (isTopSig str_info)
 
     unf_info = unfoldingInfo info
     has_unf = hasSomeUnfolding unf_info

compiler/iface/MkIface.hs

@@ -1684,7 +1684,7 @@ toIfaceIdInfo id_info
     ------------  Strictness  --------------
         -- No point in explicitly exporting TopSig
     sig_info = strictnessInfo id_info
-    strict_hsinfo | not (isNopSig sig_info) = Just (HsStrictness sig_info)
+    strict_hsinfo | not (isTopSig sig_info) = Just (HsStrictness sig_info)
                   | otherwise               = Nothing
 
     ------------  Unfolding  --------------

compiler/main/TidyPgm.hs

@@ -37,7 +37,7 @@ import IdInfo
 import InstEnv
 import FamInstEnv
 import Type             ( tidyTopType )
-import Demand           ( appIsBottom, isNopSig, isBottomingSig )
+import Demand           ( appIsBottom, isTopSig, isBottomingSig )
 import BasicTypes
 import Name hiding (varName)
 import NameSet
@@ -1242,7 +1242,7 @@ tidyTopIdInfo dflags rhs_tidy_env name orig_rhs tidy_rhs idinfo show_unfold caf_
     mb_bot_str = exprBotStrictness_maybe orig_rhs
 
     sig = strictnessInfo idinfo
-    final_sig | not $ isNopSig sig
+    final_sig | not $ isTopSig sig
                  = WARN( _bottom_hidden sig , ppr name ) sig
                  -- try a cheap-and-cheerful bottom analyser
                  | Just (_, nsig) <- mb_bot_str = nsig