diff --git a/basis/compiler/cfg/liveness/ssa/ssa.factor b/basis/compiler/cfg/liveness/ssa/ssa.factor
deleted file mode 100644
index 82af084f06..0000000000
--- a/basis/compiler/cfg/liveness/ssa/ssa.factor
+++ /dev/null
@@ -1,59 +0,0 @@
-! Copyright (C) 2009 Slava Pestov.
-! See http://factorcode.org/license.txt for BSD license.
-USING: kernel namespaces deques accessors sets sequences assocs fry
-hashtables dlists compiler.cfg.def-use compiler.cfg.instructions
-compiler.cfg.rpo compiler.cfg.liveness compiler.cfg.utilities ;
-IN: compiler.cfg.liveness.ssa
-
-! TODO: merge with compiler.cfg.liveness
-
-! Assoc mapping basic blocks to sequences of sets of vregs; each sequence
-! is in correspondence with a predecessor
-SYMBOL: phi-live-ins
-
-: phi-live-in ( predecessor basic-block -- set ) phi-live-ins get at at ;
-
-SYMBOL: work-list
-
-: add-to-work-list ( basic-blocks -- )
-    work-list get '[ _ push-front ] each ;
-
-: compute-live-in ( basic-block -- live-in )
-    [ live-out ] keep instructions>> transfer-liveness ;
-
-: compute-phi-live-in ( basic-block -- phi-live-in )
-    H{ } clone [
-        '[ inputs>> [ swap _ conjoin-at ] assoc-each ] each-phi
-    ] keep ;
-
-: update-live-in ( basic-block -- changed? )
-    [ [ compute-live-in ] keep live-ins get maybe-set-at ]
-    [ [ compute-phi-live-in ] keep phi-live-ins get maybe-set-at ]
-    bi or ;
-
-: compute-live-out ( basic-block -- live-out )
-    [ successors>> [ live-in ] map ]
-    [ dup successors>> [ phi-live-in ] with map ] bi
-    append assoc-combine ;
-
-: update-live-out ( basic-block -- changed? )
-    [ compute-live-out ] keep
-    live-outs get maybe-set-at ;
-
-: liveness-step ( basic-block -- )
-    dup update-live-out [
-        dup update-live-in
-        [ predecessors>> add-to-work-list ] [ drop ] if
-    ] [ drop ] if ;
-
-: compute-ssa-live-sets ( cfg -- cfg' )
-    <hashed-dlist> work-list set
-    H{ } clone live-ins set
-    H{ } clone phi-live-ins set
-    H{ } clone live-outs set
-    dup post-order add-to-work-list
-    work-list get [ liveness-step ] slurp-deque ;
-
-: live-in? ( vreg bb -- ? ) live-in key? ;
-
-: live-out? ( vreg bb -- ? ) live-out key? ;
\ No newline at end of file