4 files changed, 23 insertions, 17 deletions
diff --git a/lib/hipe/icode/hipe_icode_range.erl b/lib/hipe/icode/hipe_icode_range.erl
index 7fea1c3d7c..af160769a1 100644
--- a/lib/hipe/icode/hipe_icode_range.erl
+++ b/lib/hipe/icode/hipe_icode_range.erl
@@ -84,7 +84,7 @@
 
 -record(state, {info_map = #{}			:: info(),
 		cfg				:: cfg(),
-		liveness = gb_trees:empty()	:: gb_trees:tree(),
+		liveness			:: hipe_icode_ssa:liveness(),
 		ret_type			:: range(),
 		lookup_fun			:: call_fun(),
 		result_action			:: final_fun()}).
diff --git a/lib/hipe/icode/hipe_icode_ssa.erl b/lib/hipe/icode/hipe_icode_ssa.erl
index b222fbc7d2..aca13a2ff0 100644
--- a/lib/hipe/icode/hipe_icode_ssa.erl
+++ b/lib/hipe/icode/hipe_icode_ssa.erl
@@ -34,13 +34,16 @@
 -define(LIVENESS, hipe_icode_liveness).
 -define(LIVENESS_NEEDED, true).
 
+-export_type([liveness/0]).
+
 -include("hipe_icode.hrl").
 -include("../ssa/hipe_ssa.inc").
 
 %% Declarations for exported functions which are Icode-specific.
--spec ssa_liveness__analyze(#cfg{}) -> gb_trees:tree().
--spec ssa_liveness__livein(_, icode_lbl()) -> [#icode_variable{}].
-%% -spec ssa_liveness__livein(_, icode_lbl(), _) -> [#icode_var{}].
+-opaque liveness() :: liveness(icode_lbl(), #icode_variable{}).
+-spec ssa_liveness__analyze(#cfg{}) -> liveness().
+-spec ssa_liveness__livein(liveness(), icode_lbl()) -> [#icode_variable{}].
+%% -spec ssa_liveness__livein(liveness(), icode_lbl(), _) -> [#icode_var{}].
 
 %%----------------------------------------------------------------------
 %% Auxiliary operations which seriously differ between Icode and RTL.
diff --git a/lib/hipe/icode/hipe_icode_type.erl b/lib/hipe/icode/hipe_icode_type.erl
index 794c27ebcc..3f0e2998f1 100644
--- a/lib/hipe/icode/hipe_icode_type.erl
+++ b/lib/hipe/icode/hipe_icode_type.erl
@@ -100,7 +100,7 @@
 
 -record(state, {info_map  = gb_trees:empty() :: gb_trees:tree(),
 		cfg                          :: cfg(),
-		liveness  = gb_trees:empty() :: gb_trees:tree(),
+		liveness                     :: hipe_icode_ssa:liveness(),
 		arg_types                    :: [erl_types:erl_type()],
 		ret_type  = [t_none()]       :: [erl_types:erl_type()],
 		lookupfun                    :: call_fun(),
diff --git a/lib/hipe/ssa/hipe_ssa_liveness.inc b/lib/hipe/ssa/hipe_ssa_liveness.inc
index 78488c65fc..46df8b66ad 100644
--- a/lib/hipe/ssa/hipe_ssa_liveness.inc
+++ b/lib/hipe/ssa/hipe_ssa_liveness.inc
@@ -40,6 +40,15 @@
 	 ssa_liveness__livein/2]).
 %%	 ssa_liveness__livein/3],
 %%	 ssa_liveness__liveout/2]).
+-type set(E) :: gb_sets:set(E).
+-type liveness(Label, Var) ::
+	#{Label => {{Gen          :: set(Var),
+		     Kill         :: set(Var),
+		     {TotalDirGen :: set(Var),
+		      DirGen      :: gb_trees:tree(Label, set(Var))}},
+		    LiveIn        :: set(Var),
+		    LiveOut       :: set(Var),
+		    Successors    :: [Label]}}.
 -endif.
 %% -ifdef(DEBUG_LIVENESS).
 %% -export([pp_liveness/1]).
@@ -262,21 +271,15 @@ update_directed_gen({Pred, Var}, Map)->
 %%
 %% liveness
 %%
+-compile({inline, [liveness_lookup/2, liveness_update/3]}).
 
 liveness_init(List) ->
-  liveness_init1(List, gb_trees:empty()).
+  maps:from_list(List).
 
-liveness_init1([{Label, Info}|Left], Map) ->
-  liveness_init1(Left, gb_trees:insert(Label, Info, Map));
-liveness_init1([], Map) ->
-  Map.
-
-liveness_lookup(Label, Map) ->
-  {value, Info} = gb_trees:lookup(Label, Map),
-  Info.
-
-liveness_update(Label, NewInfo, Map) ->
-  gb_trees:update(Label, NewInfo, Map).
+liveness_lookup(Label, Liveness) ->
+  maps:get(Label, Liveness).
+liveness_update(Label, Val, Liveness) ->
+  maps:update(Label, Val, Liveness).
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%