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%% -*- erlang-indent-level: 2 -*-
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
-module(hipe_moves).
-export([new/1,
update_movelist/3,
node_moves/2,
move_related/2,
node_movelist/2,
get_move/2,
is_empty_worklist/1,
worklist_get_and_remove/1,
remove_worklist/2,
remove_active/2,
add_worklist/2,
add_active/2,
member_active/2
]).
-ifdef(DEBUG_PRINTOUTS).
-export([print_memberships/1]).
-endif.
-record(movesets,
{worklist, % Moves enabled for possible coalescing
membership, % Maps move numbers to 'worklist' or 'active' or 'none'
moveinsns, % Maps move numbers to move insns ({Dst,Src}-tuples)
movelist % Mapping from node to list of moves it's associated with
}).
%%-ifndef(DEBUG).
%%-define(DEBUG,true).
%%-endif.
-include("../main/hipe.hrl").
worklist(MoveSets) -> MoveSets#movesets.worklist.
movelist(MoveSets) -> MoveSets#movesets.movelist.
set_worklist(New_worklist, MoveSets) ->
MoveSets#movesets{worklist = New_worklist}.
set_movelist(New_movelist, MoveSets) ->
MoveSets#movesets{movelist = New_movelist}.
update_movelist(Node, MoveList, MoveSets) ->
set_movelist(hipe_vectors:set(movelist(MoveSets), Node, MoveList),
MoveSets).
new(IG) ->
{MoveList,NrMoves,MoveInsns} = hipe_ig:get_moves(IG),
Worklist = case NrMoves of 0 -> []; _ -> lists:seq(0, NrMoves-1) end,
#movesets{worklist = Worklist,
membership = hipe_bifs:array(NrMoves, 'worklist'),
moveinsns = MoveInsns,
movelist = MoveList}.
remove_worklist(Element, MoveSets) ->
Membership = MoveSets#movesets.membership,
%% check for 'worklist' membership here, if debugging
hipe_bifs:array_update(Membership, Element, 'none'),
%% Implementing this faithfully would require a SET structure, such
%% as an ordset or a gb_set. However, removal of elements not at the
%% head of the structure is a fairly infrequent event (only done by
%% FreezeMoves()), so instead we let the elements remain but mark
%% them as being removed. It is the task of worklist_get_and_remove()
%% to filter out any stale elements.
MoveSets.
remove_active(Element, MoveSets) ->
Membership = MoveSets#movesets.membership,
%% check for 'active' membership here, if debugging
hipe_bifs:array_update(Membership, Element, 'none'),
MoveSets.
add_worklist(Element, MoveSets) ->
Membership = MoveSets#movesets.membership,
%% check for 'none' membership here, if debugging
hipe_bifs:array_update(Membership, Element, 'worklist'),
set_worklist([Element | worklist(MoveSets)], MoveSets).
add_active(Element, MoveSets) ->
Membership = MoveSets#movesets.membership,
%% check for 'none' membership here, if debugging
hipe_bifs:array_update(Membership, Element, 'active'),
MoveSets.
member_active(Element, MoveSets) ->
hipe_bifs:array_sub(MoveSets#movesets.membership, Element) =:= 'active'.
is_empty_worklist(MoveSets) ->
%% This is an approximation. See worklist_get_and_remove().
worklist(MoveSets) =:= [].
worklist_get_and_remove(MoveSets) ->
worklist_get_and_remove(worklist(MoveSets), MoveSets#movesets.membership, MoveSets).
worklist_get_and_remove([], _Membership, MoveSets) ->
{[], set_worklist([], MoveSets)};
worklist_get_and_remove([Move|Worklist], Membership, MoveSets) ->
case hipe_bifs:array_sub(Membership, Move) of
'worklist' ->
hipe_bifs:array_update(Membership, Move, 'none'),
{Move, set_worklist(Worklist, MoveSets)};
_ ->
worklist_get_and_remove(Worklist, Membership, MoveSets)
end.
node_moves(Node, MoveSets) ->
Associated = node_movelist(Node, MoveSets),
Membership = MoveSets#movesets.membership,
%% The ordsets:union() in hipe_coalescing_regalloc:combine()
%% constrains us to return an ordset here.
[X || X <- Associated, hipe_bifs:array_sub(Membership, X) =/= 'none'].
move_related(Node, MoveSets) ->
%% Same as node_moves(Node, MoveSets) =/= [], but less expensive to compute.
%% XXX: George&Appel'96 hints that this should be maintained as a per-node counter.
move_related2(node_movelist(Node, MoveSets), MoveSets#movesets.membership).
move_related2([], _Membership) -> false;
move_related2([Move|MoveSets], Membership) ->
case hipe_bifs:array_sub(Membership, Move) of
'none' -> move_related2(MoveSets, Membership);
_ -> true % 'active' or 'worklist'
end.
node_movelist(Node, MoveSets) ->
hipe_vectors:get(movelist(MoveSets), Node).
get_move(Move, MoveSets) ->
element(Move+1, MoveSets#movesets.moveinsns).
%%----------------------------------------------------------------------
%% Print functions - only used for debugging
-ifdef(DEBUG_PRINTOUTS).
print_memberships(MoveSets) ->
?debug_msg("Move memeberships:\n", []),
Membership = MoveSets#movesets.membership,
NrMoves = hipe_bifs:array_length(Membership),
print_membership(NrMoves, Membership).
print_membership(0, _) ->
true;
print_membership(Element, Membership) ->
NextElement = Element - 1,
?debug_msg("move ~w ~w\n", [NextElement, hipe_bifs:array_sub(Membership, NextElement)]),
print_membership(NextElement, Membership).
-endif.
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