diff --git a/basis/compiler/cfg/alias-analysis/alias-analysis.factor b/basis/compiler/cfg/alias-analysis/alias-analysis.factor
index ee60e112b7..3cf099d149 100644
--- a/basis/compiler/cfg/alias-analysis/alias-analysis.factor
+++ b/basis/compiler/cfg/alias-analysis/alias-analysis.factor
@@ -319,5 +319,5 @@ M: insn eliminate-dead-stores* ;
     compute-live-stores
     eliminate-dead-stores ;
 
-: alias-analysis ( cfg -- cfg' )
-    [ alias-analysis-step ] local-optimization ;
+: alias-analysis ( cfg -- cfg )
+    dup [ alias-analysis-step ] simple-optimization ;
diff --git a/basis/compiler/cfg/rpo/rpo.factor b/basis/compiler/cfg/rpo/rpo.factor
index 6e09d9885f..a76beca181 100644
--- a/basis/compiler/cfg/rpo/rpo.factor
+++ b/basis/compiler/cfg/rpo/rpo.factor
@@ -39,8 +39,8 @@ SYMBOL: visited
     [ drop basic-block set ]
     [ change-instructions drop ] 2bi ; inline
 
-: local-optimization ( ... cfg quot: ( ... insns -- ... insns' ) -- ... cfg' )
-    dupd '[ _ optimize-basic-block ] each-basic-block ; inline
+: simple-optimization ( ... cfg quot: ( ... insns -- ... insns' ) -- ... )
+    '[ _ optimize-basic-block ] each-basic-block ; inline
 
 : needs-post-order ( cfg -- cfg' )
     dup post-order drop ;
diff --git a/basis/compiler/cfg/ssa/destruction/destruction.factor b/basis/compiler/cfg/ssa/destruction/destruction.factor
index ff174bc713..ede012eb2f 100644
--- a/basis/compiler/cfg/ssa/destruction/destruction.factor
+++ b/basis/compiler/cfg/ssa/destruction/destruction.factor
@@ -123,11 +123,8 @@ M: ##phi useful-insn? drop f ;
 
 M: insn useful-insn? drop t ;
 
-: cleanup-block ( bb -- )
-    instructions>> [ useful-insn? ] filter! drop ;
-
 : cleanup-cfg ( cfg -- )
-    [ cleanup-block ] each-basic-block ;
+    [ [ useful-insn? ] filter! ] simple-optimization ;
 
 PRIVATE>
 
diff --git a/basis/compiler/cfg/value-numbering/value-numbering.factor b/basis/compiler/cfg/value-numbering/value-numbering.factor
index ad3ccb1693..81e9d53bad 100644
--- a/basis/compiler/cfg/value-numbering/value-numbering.factor
+++ b/basis/compiler/cfg/value-numbering/value-numbering.factor
@@ -49,7 +49,7 @@ M: array process-instruction
     init-value-graph
     [ process-instruction ] map flatten ;
 
-: value-numbering ( cfg -- cfg' )
-    [ value-numbering-step ] local-optimization
+: value-numbering ( cfg -- cfg )
+    dup [ value-numbering-step ] simple-optimization
 
     cfg-changed predecessors-changed ;
diff --git a/basis/compiler/cfg/write-barrier/write-barrier.factor b/basis/compiler/cfg/write-barrier/write-barrier.factor
index cecf5f7251..a34bf6c07f 100644
--- a/basis/compiler/cfg/write-barrier/write-barrier.factor
+++ b/basis/compiler/cfg/write-barrier/write-barrier.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008, 2009 Slava Pestov, Daniel Ehrenberg.
+! Copyright (C) 2008, 2010 Slava Pestov, Daniel Ehrenberg.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors assocs combinators.short-circuit
 compiler.cfg.instructions compiler.cfg.rpo kernel namespaces
@@ -35,10 +35,10 @@ M: ##copy eliminate-write-barrier
 
 M: insn eliminate-write-barrier drop t ;
 
-: write-barriers-step ( bb -- )
+: write-barriers-step ( insns -- insns' )
     H{ } clone fresh-allocations set
     H{ } clone mutated-objects set
-    instructions>> [ eliminate-write-barrier ] filter! drop ;
+    [ eliminate-write-barrier ] filter! ;
 
-: eliminate-write-barriers ( cfg -- cfg' )
-    dup [ write-barriers-step ] each-basic-block ;
+: eliminate-write-barriers ( cfg -- cfg )
+    dup [ write-barriers-step ] simple-optimization ;