Remove some dead code from VectType

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

diff --git a/compiler/simplCore/OccurAnal.lhs b/compiler/simplCore/OccurAnal.lhs
index 7c7cf89..fb72577 100644 (file)
--- a/compiler/simplCore/OccurAnal.lhs
+++ b/compiler/simplCore/OccurAnal.lhs
@@ -15,8 +15,6 @@ module OccurAnal (
         occurAnalysePgm, occurAnalyseExpr
     ) where
 
--- XXX This define is a bit of a hack, and should be done more nicely
-#define FAST_STRING_NOT_NEEDED 1
 #include "HsVersions.h"
 
 import CoreSyn
@@ -348,8 +346,9 @@ occAnalRec (CyclicSCC nodes) (body_usage, binds)
 
     tag_node :: UsageDetails -> Node Details -> (UsageDetails, Node Details)
        -- (a) Tag the binders in the details with occ info
-       -- (b) Mark the binder with OccInfo saying "no preInlineUnconditionally" if
-       --      it is used in any rule (lhs or rhs) of the recursive group
+       -- (b) Mark the binder with "weak loop-breaker" OccInfo 
+       --      saying "no preInlineUnconditionally" if it is used
+       --      in any rule (lhs or rhs) of the recursive group
        --      See Note [Weak loop breakers]
     tag_node usage (ND bndr rhs rhs_usage rhs_fvs, k, ks)
       = (usage `delVarEnv` bndr, (ND bndr2 rhs rhs_usage rhs_fvs, k, ks))
@@ -508,6 +507,12 @@ reOrderCycle (bind : binds)
         | is_con_app rhs = 2    -- Data types help with cases
                 -- Note [conapp]
 
+-- If an Id is marked "never inline" then it makes a great loop breaker
+-- The only reason for not checking that here is that it is rare
+-- and I've never seen a situation where it makes a difference,
+-- so it probably isn't worth the time to test on every binder
+--     | isNeverActive (idInlinePragma bndr) = -10
+
         | inlineCandidate bndr rhs = 1  -- Likely to be inlined
                 -- Note [Inline candidates]