diff --git a/basis/compiler/cfg/branch-splitting/branch-splitting.factor b/basis/compiler/cfg/branch-splitting/branch-splitting.factor
index 2ab476e20c..89e3604aec 100644
--- a/basis/compiler/cfg/branch-splitting/branch-splitting.factor
+++ b/basis/compiler/cfg/branch-splitting/branch-splitting.factor
@@ -6,18 +6,8 @@ compiler.cfg.def-use compiler.cfg compiler.cfg.rpo
 compiler.cfg.renaming compiler.cfg.instructions compiler.cfg.utilities ;
 IN: compiler.cfg.branch-splitting
 
-: clone-renamings ( insns -- assoc )
-    [ defs-vregs ] map concat [ dup fresh-vreg ] H{ } map>assoc ;
-
 : clone-instructions ( insns -- insns' )
-    dup clone-renamings renamings [
-        [
-            clone
-            dup rename-insn-defs
-            dup rename-insn-uses
-            dup fresh-insn-temps
-        ] map
-    ] with-variable ;
+    [ clone dup fresh-insn-temps ] map ;
 
 : clone-basic-block ( bb -- bb' )
     ! The new block gets the same RPO number as the old one.
@@ -62,10 +52,7 @@ IN: compiler.cfg.branch-splitting
 
 UNION: irrelevant ##peek ##replace ##inc-d ##inc-r ;
 
-: split-instructions? ( insns -- ? )
-    [ [ irrelevant? not ] count 5 <= ]
-    [ last ##fixnum-overflow? not ]
-    bi and ;
+: split-instructions? ( insns -- ? ) [ irrelevant? not ] count 5 <= ;
 
 : split-branch? ( bb -- ? )
     {