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%-----------------------------------------------------------------------------%
% Copyright (C) 1995-1997 The University of Melbourne.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%-----------------------------------------------------------------------------%
% vn_table.m - predicates for managing vn tables.
% author: zs.
%-----------------------------------------------------------------------------%
:- module vn_table.
:- interface.
:- import_module vn_type.
:- import_module assoc_list, list, map.
:- type vn_tables.
% The definitions of the following types are exported only for debugging.
:- type lval_to_vn_table == map(vnlval, vn).
:- type rval_to_vn_table == map(vnrval, vn).
:- type vn_to_rval_table == map(vn, vnrval).
:- type vn_to_uses_table == map(vn, list(vn_src)).
:- type vn_to_locs_table == map(vn, list(vnlval)).
:- type loc_to_vn_table == map(vnlval, vn).
:- pred vn_table__init_tables(vn_tables).
:- mode vn_table__init_tables(out) is det.
:- pred vn_table__get_next_vn(vn_tables, vn).
:- mode vn_table__get_next_vn(in, out) is det.
:- pred vn_table__get_lval_to_vn_table(vn_tables, lval_to_vn_table).
:- mode vn_table__get_lval_to_vn_table(in, out) is det.
:- pred vn_table__get_rval_to_vn_table(vn_tables, rval_to_vn_table).
:- mode vn_table__get_rval_to_vn_table(in, out) is det.
:- pred vn_table__get_vn_to_rval_table(vn_tables, vn_to_rval_table).
:- mode vn_table__get_vn_to_rval_table(in, out) is det.
:- pred vn_table__get_vn_to_uses_table(vn_tables, vn_to_uses_table).
:- mode vn_table__get_vn_to_uses_table(in, out) is det.
:- pred vn_table__get_vn_to_locs_table(vn_tables, vn_to_locs_table).
:- mode vn_table__get_vn_to_locs_table(in, out) is det.
:- pred vn_table__get_loc_to_vn_table(vn_tables, loc_to_vn_table).
:- mode vn_table__get_loc_to_vn_table(in, out) is det.
:- pred vn_table__lookup_desired_value(vnlval, vn, string, vn_tables).
:- mode vn_table__lookup_desired_value(in, out, in, in) is det.
:- pred vn_table__lookup_assigned_vn(vnrval, vn, string, vn_tables).
:- mode vn_table__lookup_assigned_vn(in, out, in, in) is det.
:- pred vn_table__lookup_defn(vn, vnrval, string, vn_tables).
:- mode vn_table__lookup_defn(in, out, in, in) is det.
:- pred vn_table__lookup_uses(vn, list(vn_src), string, vn_tables).
:- mode vn_table__lookup_uses(in, out, in, in) is det.
:- pred vn_table__lookup_current_locs(vn, list(vnlval), string, vn_tables).
:- mode vn_table__lookup_current_locs(in, out, in, in) is det.
:- pred vn_table__lookup_current_value(vnlval, vn, string, vn_tables).
:- mode vn_table__lookup_current_value(in, out, in, in) is det.
:- pred vn_table__search_desired_value(vnlval, vn, vn_tables).
:- mode vn_table__search_desired_value(in, out, in) is semidet.
:- pred vn_table__search_assigned_vn(vnrval, vn, vn_tables).
:- mode vn_table__search_assigned_vn(in, out, in) is semidet.
:- pred vn_table__search_defn(vn, vnrval, vn_tables).
:- mode vn_table__search_defn(in, out, in) is semidet.
:- pred vn_table__search_uses(vn, list(vn_src), vn_tables).
:- mode vn_table__search_uses(in, out, in) is semidet.
:- pred vn_table__search_current_locs(vn, list(vnlval), vn_tables).
:- mode vn_table__search_current_locs(in, out, in) is semidet.
:- pred vn_table__search_current_value(vnlval, vn, vn_tables).
:- mode vn_table__search_current_value(in, out, in) is semidet.
:- pred vn_table__get_vnlval_vn_list(vn_tables, assoc_list(vnlval, vn)).
:- mode vn_table__get_vnlval_vn_list(in, out) is det.
:- pred vn_table__add_new_use(vn, vn_src, vn_tables, vn_tables).
% :- mode vn_table__add_new_use(in, in, di, uo) is det.
:- mode vn_table__add_new_use(in, in, in, out) is det.
:- pred vn_table__del_old_use(vn, vn_src, vn_tables, vn_tables).
% :- mode vn_table__del_old_use(in, in, di, uo) is det.
:- mode vn_table__del_old_use(in, in, in, out) is det.
:- pred vn_table__del_old_uses(list(vn), vn_src, vn_tables, vn_tables).
% :- mode vn_table__del_old_uses(in, in, di, uo) is det.
:- mode vn_table__del_old_uses(in, in, in, out) is det.
:- pred vn_table__record_first_vnrval(vnrval, vn, vn_tables, vn_tables).
% :- mode vn_table__record_first_vnrval(in, out, di, uo) is det.
:- mode vn_table__record_first_vnrval(in, out, in, out) is det.
:- pred vn_table__record_new_vnrval(vnrval, vn, vn_tables, vn_tables).
% :- mode vn_table__record_first_vnrval(in, out, di, uo) is det.
:- mode vn_table__record_new_vnrval(in, out, in, out) is det.
:- pred vn_table__record_first_vnlval(vnlval, vn, vn_tables, vn_tables).
% :- mode vn_table__record_first_vnlval(in, out, di, uo) is det.
:- mode vn_table__record_first_vnlval(in, out, in, out) is det.
:- pred vn_table__set_desired_value(vnlval, vn, vn_tables, vn_tables).
% :- mode vn_table__set_desired_value(in, in, di, uo) is det.
:- mode vn_table__set_desired_value(in, in, in, out) is det.
:- pred vn_table__set_current_value(vnlval, vn, vn_tables, vn_tables).
% :- mode vn_table__set_current_value(in, in, di, uo) is det.
:- mode vn_table__set_current_value(in, in, in, out) is det.
:- pred vn_table__set_parallel_value(vnlval, vn, vn_tables, vn_tables).
% :- mode vn_table__set_parallel_value(in, in, di, uo) is det.
:- mode vn_table__set_parallel_value(in, in, in, out) is det.
:- pred vn_table__get_all_vnrvals(list(vnrval), vn_tables).
:- mode vn_table__get_all_vnrvals(out, in) is det.
%-----------------------------------------------------------------------------%
:- implementation.
:- import_module llds, opt_debug.
:- import_module int, string, require.
:- type vn_tables ---> vn_tables(vn,
lval_to_vn_table, rval_to_vn_table,
vn_to_rval_table, vn_to_uses_table,
vn_to_locs_table, loc_to_vn_table).
vn_table__get_next_vn(VnTables, NextVn) :-
VnTables = vn_tables(NextVn,
_Lval_to_vn_table, _Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_lval_to_vn_table(VnTables, Lval_to_vn_table) :-
VnTables = vn_tables(_NextVn,
Lval_to_vn_table, _Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_rval_to_vn_table(VnTables, Rval_to_vn_table) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_vn_to_rval_table(VnTables, Vn_to_rval_table) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, _Rval_to_vn_table,
Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_vn_to_uses_table(VnTables, Vn_to_uses_table) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, _Rval_to_vn_table,
_Vn_to_rval_table, Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_vn_to_locs_table(VnTables, Vn_to_locs_table) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, _Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
Vn_to_locs_table, _Loc_to_vn_table).
vn_table__get_loc_to_vn_table(VnTables, Loc_to_vn_table) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, _Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, Loc_to_vn_table).
vn_table__init_tables(VnTables) :-
map__init(Lval_to_vn_table0),
map__init(Rval_to_vn_table0),
map__init(Vn_to_rval_table0),
map__init(Vn_to_uses_table0),
map__init(Vn_to_locs_table0),
map__init(Loc_to_vn_table0),
VnTables = vn_tables(0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0).
vn_table__lookup_desired_value(Vnlval, Vn, From, VnTables) :-
vn_table__get_lval_to_vn_table(VnTables, Lval_to_vn_table),
( map__search(Lval_to_vn_table, Vnlval, VnPrime) ->
Vn = VnPrime
;
opt_debug__dump_vnlval(Vnlval, Value),
string__append_list([From, ": cannot find desired value for ", Value], Error),
error(Error)
).
vn_table__lookup_assigned_vn(Vnrval, Vn, From, VnTables) :-
vn_table__get_rval_to_vn_table(VnTables, Rval_to_vn_table),
( map__search(Rval_to_vn_table, Vnrval, VnPrime) ->
Vn = VnPrime
;
opt_debug__dump_vnrval(Vnrval, Value),
string__append_list([From, ": cannot find assigned vn for ", Value], Error),
error(Error)
).
vn_table__lookup_defn(Vn, Vnrval, From, VnTables) :-
vn_table__get_vn_to_rval_table(VnTables, Vn_to_rval_table),
( map__search(Vn_to_rval_table, Vn, VnrvalPrime) ->
Vnrval = VnrvalPrime
;
opt_debug__dump_vn(Vn, Value),
string__append_list([From, ": cannot find definition for ", Value], Error),
error(Error)
).
vn_table__lookup_uses(Vn, Uses, From, VnTables) :-
vn_table__get_vn_to_uses_table(VnTables, Vn_to_uses_table),
( map__search(Vn_to_uses_table, Vn, UsesPrime) ->
Uses = UsesPrime
;
opt_debug__dump_vn(Vn, Value),
string__append_list([From, ": cannot find uses for ", Value], Error),
error(Error)
).
vn_table__lookup_current_locs(Vn, Locs, From, VnTables) :-
vn_table__get_vn_to_locs_table(VnTables, Vn_to_locs_table),
( map__search(Vn_to_locs_table, Vn, LocsPrime) ->
Locs = LocsPrime
;
opt_debug__dump_vn(Vn, Value),
string__append_list([From, ": cannot find current locs for ", Value], Error),
error(Error)
).
vn_table__lookup_current_value(Vnlval, Vn, From, VnTables) :-
vn_table__get_loc_to_vn_table(VnTables, Loc_to_vn_table),
( map__search(Loc_to_vn_table, Vnlval, VnPrime) ->
Vn = VnPrime
;
opt_debug__dump_vnlval(Vnlval, Value),
string__append_list([From, ": cannot find current value for ", Value], Error),
error(Error)
).
%-----------------------------------------------------------------------------%
vn_table__search_desired_value(Vnlval, Vn, VnTables) :-
vn_table__get_lval_to_vn_table(VnTables, Lval_to_vn_table),
map__search(Lval_to_vn_table, Vnlval, Vn).
vn_table__search_assigned_vn(Vnrval, Vn, VnTables) :-
vn_table__get_rval_to_vn_table(VnTables, Rval_to_vn_table),
map__search(Rval_to_vn_table, Vnrval, Vn).
vn_table__search_defn(Vn, Vnrval, VnTables) :-
vn_table__get_vn_to_rval_table(VnTables, Vn_to_rval_table),
map__search(Vn_to_rval_table, Vn, Vnrval).
vn_table__search_uses(Vn, Uses, VnTables) :-
vn_table__get_vn_to_uses_table(VnTables, Vn_to_uses_table),
map__search(Vn_to_uses_table, Vn, Uses).
vn_table__search_current_locs(Vn, Locs, VnTables) :-
vn_table__get_vn_to_locs_table(VnTables, Vn_to_locs_table),
map__search(Vn_to_locs_table, Vn, Locs).
vn_table__search_current_value(Vnlval, Vn, VnTables) :-
vn_table__get_loc_to_vn_table(VnTables, Loc_to_vn_table),
map__search(Loc_to_vn_table, Vnlval, Vn).
vn_table__get_vnlval_vn_list(VnTables, Lval_vn_list) :-
vn_table__get_lval_to_vn_table(VnTables, Lval_to_vn_table),
map__to_assoc_list(Lval_to_vn_table, Lval_vn_list).
%-----------------------------------------------------------------------------%
vn_table__add_new_use(Vn, NewUse, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
( map__search(Vn_to_uses_table0, Vn, Uses0Prime) ->
Uses0 = Uses0Prime
;
error("cannot find old use set in add_new_use")
),
% Reenable the commented out stuff if you want the compiler
% to fail when an operator is used with two identical operands
% in a situation that might be optimizable.
% (
% list__member(NewUse, Uses0),
% \+ (
% NewUse = src_access(_)
% ;
% NewUse = src_vn(UserVn),
% map__lookup(Vn_to_rval_table0, UserVn, VnRval),
% VnRval = vn_binop(Operator, _, _),
% ( Operator = (+)
% ; Operator = (*)
% ; Operator = float_plus
% ; Operator = float_times
% ; Operator = (<<)
% ; Operator = (>>)
% )
% )
% ->
% opt_debug__dump_tables(VnTables0, T_str),
% opt_debug__dump_vn(Vn, V_str),
% opt_debug__dump_use(NewUse, U_str),
% string__append_list(["\n", T_str, "\n",
% "new use for vn ", V_str, " = ", U_str, "\n",
% "new use already known"], Msg),
% error(Msg)
% ;
Uses1 = [NewUse | Uses0],
% ),
map__det_update(Vn_to_uses_table0, Vn, Uses1, Vn_to_uses_table1),
VnTables = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table1,
Vn_to_locs_table0, Loc_to_vn_table0).
vn_table__del_old_use(Vn, OldUse, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
( map__search(Vn_to_uses_table0, Vn, Uses0Prime) ->
Uses0 = Uses0Prime
;
error("cannot find old use set in add_new_use")
),
% a given src_access may appear several times, we delete just one
( list__delete_first(Uses0, OldUse, Uses1Prime) ->
Uses1 = Uses1Prime
;
% OldUse may not be in Uses0; it may have been deleted earlier
% (if constant) or it may be an artificially introduced
% src_liveval for a shared vn
Uses1 = Uses0
),
map__det_update(Vn_to_uses_table0, Vn, Uses1, Vn_to_uses_table1),
VnTables = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table1,
Vn_to_locs_table0, Loc_to_vn_table0).
vn_table__del_old_uses([], _OldUse, VnTables, VnTables).
vn_table__del_old_uses([Vn | Vns], OldUse, VnTables0, VnTables) :-
vn_table__del_old_use(Vn, OldUse, VnTables0, VnTables1),
vn_table__del_old_uses(Vns, OldUse, VnTables1, VnTables).
vn_table__record_first_vnrval(Vnrval, Vn, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
Vn = NextVn0,
NextVn1 is NextVn0 + 1,
map__det_insert(Rval_to_vn_table0, Vnrval, Vn, Rval_to_vn_table1),
map__det_insert(Vn_to_rval_table0, Vn, Vnrval, Vn_to_rval_table1),
map__det_insert(Vn_to_uses_table0, Vn, [], Vn_to_uses_table1),
map__det_insert(Vn_to_locs_table0, Vn, [], Vn_to_locs_table1),
VnTables = vn_tables(NextVn1,
Lval_to_vn_table0, Rval_to_vn_table1,
Vn_to_rval_table1, Vn_to_uses_table1,
Vn_to_locs_table1, Loc_to_vn_table0).
vn_table__record_new_vnrval(Vnrval, Vn, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
Vn = NextVn0,
NextVn1 is NextVn0 + 1,
( map__insert(Rval_to_vn_table0, Vnrval, Vn, NewRval_to_vn_table) ->
Rval_to_vn_table1 = NewRval_to_vn_table
;
Rval_to_vn_table1 = Rval_to_vn_table0
),
map__det_insert(Vn_to_rval_table0, Vn, Vnrval, Vn_to_rval_table1),
map__det_insert(Vn_to_uses_table0, Vn, [], Vn_to_uses_table1),
map__det_insert(Vn_to_locs_table0, Vn, [], Vn_to_locs_table1),
VnTables = vn_tables(NextVn1,
Lval_to_vn_table0, Rval_to_vn_table1,
Vn_to_rval_table1, Vn_to_uses_table1,
Vn_to_locs_table1, Loc_to_vn_table0).
vn_table__record_first_vnlval(Vnlval, Vn, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
Vn = NextVn0,
NextVn is NextVn0 + 1,
map__det_insert(Lval_to_vn_table0, Vnlval, Vn, Lval_to_vn_table1),
map__det_insert(Rval_to_vn_table0, vn_origlval(Vnlval), Vn,
Rval_to_vn_table1),
map__det_insert(Vn_to_rval_table0, Vn, vn_origlval(Vnlval),
Vn_to_rval_table1),
map__det_insert(Vn_to_uses_table0, Vn, [], Vn_to_uses_table1),
map__det_insert(Vn_to_locs_table0, Vn, [Vnlval], Vn_to_locs_table1),
map__det_insert(Loc_to_vn_table0, Vnlval, Vn, Loc_to_vn_table1),
VnTables = vn_tables(NextVn,
Lval_to_vn_table1, Rval_to_vn_table1,
Vn_to_rval_table1, Vn_to_uses_table1,
Vn_to_locs_table1, Loc_to_vn_table1).
vn_table__set_desired_value(Vnlval, Vn, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
( map__search(Loc_to_vn_table0, Vnlval, _) ->
map__det_update(Lval_to_vn_table0, Vnlval, Vn,
Lval_to_vn_table1),
VnTables = vn_tables(NextVn0,
Lval_to_vn_table1, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0)
;
vn_table__record_first_vnlval(Vnlval, _, VnTables0, VnTables1),
VnTables1 = vn_tables(NextVn1,
Lval_to_vn_table1, Rval_to_vn_table1,
Vn_to_rval_table1, Vn_to_uses_table1,
Vn_to_locs_table1, Loc_to_vn_table1),
map__set(Lval_to_vn_table1, Vnlval, Vn, Lval_to_vn_table2),
VnTables = vn_tables(NextVn1,
Lval_to_vn_table2, Rval_to_vn_table1,
Vn_to_rval_table1, Vn_to_uses_table1,
Vn_to_locs_table1, Loc_to_vn_table1)
).
% We put the newly generated vnlval at the end of the list of vnlvals
% containing this vn. This is because if there are several registers
% holding a vn, we pick the one at the front, and on superscalar
% machines it is better not to use a register immediately after
% its definition.
vn_table__set_current_value(Vnlval, Vn, VnTables0, VnTables) :-
VnTables0 = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table0, Loc_to_vn_table0),
( map__search(Loc_to_vn_table0, Vnlval, OldVn) ->
% change the forward mapping
map__det_update(Loc_to_vn_table0, Vnlval, Vn, Loc_to_vn_table1),
% change the reverse mapping, first for old vn, then the new
map__lookup(Vn_to_locs_table0, OldVn, OldLocs0),
list__delete_all(OldLocs0, Vnlval, OldLocs1),
map__det_update(Vn_to_locs_table0, OldVn, OldLocs1,
Vn_to_locs_table1),
map__lookup(Vn_to_locs_table1, Vn, NewLocs0),
list__append(NewLocs0, [Vnlval], NewLocs1),
map__det_update(Vn_to_locs_table1, Vn, NewLocs1,
Vn_to_locs_table2)
;
% The search in the condition can fail for newly introduced
% templocs
% change the forward mapping
map__det_insert(Loc_to_vn_table0, Vnlval, Vn, Loc_to_vn_table1),
% change the reverse mapping
map__lookup(Vn_to_locs_table0, Vn, NewLocs0),
list__append(NewLocs0, [Vnlval], NewLocs1),
map__det_update(Vn_to_locs_table0, Vn, NewLocs1,
Vn_to_locs_table2)
),
VnTables = vn_tables(NextVn0,
Lval_to_vn_table0, Rval_to_vn_table0,
Vn_to_rval_table0, Vn_to_uses_table0,
Vn_to_locs_table2, Loc_to_vn_table1).
vn_table__set_parallel_value(Vnlval, Vn, VnTables0, VnTables) :-
vn_table__set_desired_value(Vnlval, Vn, VnTables0, VnTables1),
vn_table__set_current_value(Vnlval, Vn, VnTables1, VnTables).
vn_table__get_all_vnrvals(Vnrvals, VnTables) :-
VnTables = vn_tables(_NextVn,
_Lval_to_vn_table, Rval_to_vn_table,
_Vn_to_rval_table, _Vn_to_uses_table,
_Vn_to_locs_table, _Loc_to_vn_table),
map__keys(Rval_to_vn_table, Vnrvals).
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