File 2017-hipe-flow-liveness.inc-Use-map-for-liveness-type.patch of Package erlang

From ab4062063727d713a8eca8cf09b8a0f50744bc9b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Magnus=20L=C3=A5ng?= <margnus1@telia.com>
Date: Sat, 12 Mar 2016 13:01:27 +0100
Subject: [PATCH 07/10] hipe/flow/liveness.inc: Use map for liveness type

Slightly improves performance.
---
 lib/hipe/flow/liveness.inc | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/lib/hipe/flow/liveness.inc b/lib/hipe/flow/liveness.inc
index a1caa3e..bffaa4e 100644
--- a/lib/hipe/flow/liveness.inc
+++ b/lib/hipe/flow/liveness.inc
@@ -49,6 +49,10 @@
 -endif.
 
 -include("../flow/cfg.hrl").
+-include("../main/hipe.hrl").
+
+-opaque liveness() :: map().
+-export_type([liveness/0]).
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%
@@ -72,7 +76,7 @@
 %% The generic liveness analysis
 %%
 
--spec analyze(cfg()) -> gb_trees:tree().
+-spec analyze(cfg()) -> liveness().
 
 -ifdef(HIPE_LIVENESS_CALC_LARGEST_LIVESET).
 analyze(CFG) ->
@@ -188,6 +192,7 @@ update_livein(Label, NewLiveIn, Liveness) ->
 %%
 %% LiveOut for a block is the union of the successors LiveIn
 %%
+-spec liveout(liveness(), _) -> [_].
 
 liveout(Liveness, L) ->
   Succ = successors(L, Liveness),
@@ -210,7 +215,7 @@ successors(L, Liveness) ->
   {_GK, _LiveIn, Successors} = liveness_lookup(L, Liveness),
   Successors.
 
--spec livein(gb_trees:tree(), _) -> [_].
+-spec livein(liveness(), _) -> [_].
 
 livein(Liveness, L) ->
   {_GK, LiveIn, _Successors} = liveness_lookup(L, Liveness),
@@ -292,18 +297,15 @@ strip([{_,Y}|Xs]) ->
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%
+-compile({inline, [liveness_lookup/2, liveness_update/3]}).
+
 liveness_init(List) ->
-  liveness_init(List, gb_trees:empty()).
+  maps:from_list(List).
 
-liveness_init([{Lbl, Data}|Left], Acc) ->
-  liveness_init(Left, gb_trees:insert(Lbl, Data, Acc));
-liveness_init([], Acc) ->
-  Acc.
-  
 liveness_lookup(Label, Liveness) ->
-  gb_trees:get(Label, Liveness).
+  maps:get(Label, Liveness).
 liveness_update(Label, Val, Liveness) ->
-  gb_trees:update(Label, Val, Liveness).
+  maps:update(Label, Val, Liveness).
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-- 
2.9.3