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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/hipe/regalloc/hipe_ig_moves.erl
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The R13B03 release.OTP_R13B03
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+%% -*- 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))}.