From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/hipe/regalloc/hipe_ig_moves.erl | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 lib/hipe/regalloc/hipe_ig_moves.erl

(limited to 'lib/hipe/regalloc/hipe_ig_moves.erl')

diff --git a/lib/hipe/regalloc/hipe_ig_moves.erl b/lib/hipe/regalloc/hipe_ig_moves.erl
new file mode 100644
index 0000000000..186c87a690
--- /dev/null
+++ b/lib/hipe/regalloc/hipe_ig_moves.erl
@@ -0,0 +1,81 @@
+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2001-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+%%=============================================================================
+
+-module(hipe_ig_moves).
+-export([new/1,
+	 new_move/3,
+	 get_moves/1]).
+
+-include("../util/hipe_vectors.hrl").
+
+%%-----------------------------------------------------------------------------
+%% The main data structure; its fields are:
+%%  - movelist  : mapping from temp to set of associated move numbers
+%%  - nrmoves   : number of distinct move instructions seen so far
+%%  - moveinsns : list of move instructions, in descending move number order
+%%  - moveset   : set of move instructions
+
+-record(ig_moves, {movelist                    :: hipe_vector(),	
+		   nrmoves   = 0               :: non_neg_integer(),
+		   moveinsns = []              :: [{_,_}],
+		   moveset   = gb_sets:empty() :: gb_set()}).
+
+%%-----------------------------------------------------------------------------
+
+-spec new(non_neg_integer()) -> #ig_moves{}.
+
+new(NrTemps) ->
+  MoveList = hipe_vectors:new(NrTemps, ordsets:new()),
+  #ig_moves{movelist = MoveList}.
+
+-spec new_move(_, _, #ig_moves{}) -> #ig_moves{}.
+
+new_move(Dst, Src, IG_moves) ->
+  MoveSet = IG_moves#ig_moves.moveset,
+  MoveInsn = {Dst, Src},
+  case gb_sets:is_member(MoveInsn, MoveSet) of
+    true ->
+      IG_moves;
+    false ->
+      MoveNr = IG_moves#ig_moves.nrmoves,
+      Movelist0 = IG_moves#ig_moves.movelist,
+      Movelist1 = add_movelist(MoveNr, Dst,
+			       add_movelist(MoveNr, Src, Movelist0)),
+      IG_moves#ig_moves{nrmoves = MoveNr+1,
+			movelist = Movelist1,
+			moveinsns = [MoveInsn|IG_moves#ig_moves.moveinsns],
+			moveset = gb_sets:insert(MoveInsn, MoveSet)}
+  end.
+
+-spec add_movelist(non_neg_integer(), non_neg_integer(), hipe_vector()) -> hipe_vector().
+
+add_movelist(MoveNr, Temp, MoveList) ->
+  AssocMoves = hipe_vectors:get(MoveList, Temp),
+  %% XXX: MoveNr does not occur in moveList[Temp], but the new list must be an
+  %% ordset due to the ordsets:union in hipe_coalescing_regalloc:combine().
+  hipe_vectors:set(MoveList, Temp, ordsets:add_element(MoveNr, AssocMoves)).
+
+-spec get_moves(#ig_moves{}) -> {hipe_vector(), non_neg_integer(), tuple()}.
+
+get_moves(IG_moves) -> % -> {MoveList, NrMoves, MoveInsns}
+  {IG_moves#ig_moves.movelist,
+   IG_moves#ig_moves.nrmoves,
+   list_to_tuple(lists:reverse(IG_moves#ig_moves.moveinsns))}.
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