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3c60c0e485
Estimated hours taken: 4 Branches: main compiler/*.m: Change a bunch of modules to import only one module per line, even from the library. compiler/mlds_to_il.m: compiler/mlds_to_managed.m: Convert these modules to our current coding style. Use state variables where appropriate. Use predmode declarations where possible.
536 lines
16 KiB
Mathematica
536 lines
16 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% Copyright (C) 1996-2005 The University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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% optimize.m - LLDS to LLDS optimizations.
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% Main author: zs.
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%-----------------------------------------------------------------------------%
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:- module ll_backend__optimize.
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:- interface.
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:- import_module ll_backend__global_data.
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:- import_module ll_backend__llds.
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:- import_module io.
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:- import_module list.
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:- pred optimize_main(global_data::in,
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list(c_procedure)::in, list(c_procedure)::out, io::di, io::uo) is det.
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:- pred optimize__proc(global_data::in, c_procedure::in, c_procedure::out,
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io::di, io::uo) is det.
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module backend_libs__name_mangle.
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:- import_module backend_libs__proc_label.
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:- import_module hlds__hlds_pred.
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:- import_module hlds__passes_aux.
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:- import_module libs__globals.
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:- import_module libs__options.
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:- import_module ll_backend__continuation_info.
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:- import_module ll_backend__delay_slot.
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:- import_module ll_backend__dupelim.
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:- import_module ll_backend__frameopt.
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:- import_module ll_backend__jumpopt.
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:- import_module ll_backend__labelopt.
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:- import_module ll_backend__llds_out.
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:- import_module ll_backend__opt_debug.
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:- import_module ll_backend__opt_util.
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:- import_module ll_backend__peephole.
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:- import_module ll_backend__reassign.
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:- import_module ll_backend__use_local_vars.
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:- import_module ll_backend__wrap_blocks.
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:- import_module mdbcomp__prim_data.
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:- import_module parse_tree__prog_foreign.
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:- import_module parse_tree__prog_out.
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:- import_module bool.
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:- import_module counter.
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:- import_module int.
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:- import_module map.
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:- import_module require.
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:- import_module set.
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:- import_module std_util.
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:- import_module string.
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optimize_main(GlobalData, !Procs, !IO) :-
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list__map_foldl(optimize__proc(GlobalData), !Procs, !IO).
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:- func make_internal_label(proc_label, int) = label.
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make_internal_label(ProcLabel, LabelNum) = internal(LabelNum, ProcLabel).
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optimize__proc(GlobalData, CProc0, CProc, !IO) :-
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some [!OptDebugInfo, !C, !Instrs] (
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CProc0 = c_procedure(Name, Arity, PredProcId, !:Instrs,
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ProcLabel, !:C, MayAlterRtti),
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optimize__init_opt_debug_info(Name, Arity, PredProcId,
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!.Instrs, !.C, !:OptDebugInfo, !IO),
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globals__io_lookup_int_option(optimize_repeat, Repeat, !IO),
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(
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global_data_maybe_get_proc_layout(GlobalData,
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PredProcId, ProcLayout)
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->
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LabelMap = ProcLayout ^ internal_map,
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map__sorted_keys(LabelMap, LayoutLabelNums),
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LayoutLabels = list__map(make_internal_label(ProcLabel),
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LayoutLabelNums),
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set__sorted_list_to_set(LayoutLabels, LayoutLabelSet)
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;
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set__init(LayoutLabelSet)
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),
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optimize__initial(LayoutLabelSet, ProcLabel, MayAlterRtti,
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!C, !OptDebugInfo, !Instrs, !IO),
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optimize__repeat(Repeat, LayoutLabelSet, ProcLabel,
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MayAlterRtti, !C, !OptDebugInfo, !Instrs, !IO),
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optimize__middle(yes, LayoutLabelSet, ProcLabel, MayAlterRtti,
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!C, !OptDebugInfo, !Instrs, !IO),
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optimize__last(LayoutLabelSet, !.C, !.OptDebugInfo, !Instrs,
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!IO),
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CProc = c_procedure(Name, Arity, PredProcId, !.Instrs,
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ProcLabel, !.C, MayAlterRtti)
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).
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%-----------------------------------------------------------------------------%
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:- type opt_debug_info
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---> opt_debug_info(
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string, % base file name
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int % last file number written
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)
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; no_opt_debug_info.
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:- pred optimize__init_opt_debug_info(string::in, int::in, pred_proc_id::in,
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list(instruction)::in, counter::in, opt_debug_info::out,
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io::di, io::uo) is det.
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optimize__init_opt_debug_info(Name, Arity, PredProcId, Instrs0, Counter,
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OptDebugInfo, !IO) :-
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globals__io_lookup_bool_option(debug_opt, DebugOpt, !IO),
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globals__io_lookup_int_option(debug_opt_pred_id, DebugOptPredId, !IO),
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PredProcId = proc(PredId, ProcId),
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pred_id_to_int(PredId, PredIdInt),
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proc_id_to_int(ProcId, ProcIdInt),
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(
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DebugOpt = yes,
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( DebugOptPredId >= 0 => DebugOptPredId = PredIdInt )
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->
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MangledName = name_mangle(Name),
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string__int_to_string(Arity, ArityStr),
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string__int_to_string(PredIdInt, PredIdStr),
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string__int_to_string(ProcIdInt, ProcIdStr),
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string__append_list([MangledName, "_", ArityStr,
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".pred", PredIdStr, ".proc", ProcIdStr], BaseName),
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OptDebugInfo = opt_debug_info(BaseName, 0),
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string__append_list([BaseName, ".opt0"], FileName),
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io__open_output(FileName, Res, !IO),
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( Res = ok(FileStream) ->
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io__set_output_stream(FileStream, OutputStream, !IO),
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counter__allocate(NextLabel, Counter, _),
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opt_debug__msg(yes, NextLabel, "before optimization",
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!IO),
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opt_debug__dump_instrs(yes, Instrs0, !IO),
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io__set_output_stream(OutputStream, _, !IO),
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io__close_output(FileStream, !IO)
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;
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string__append("cannot open ", FileName, ErrorMsg),
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error(ErrorMsg)
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)
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;
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OptDebugInfo = no_opt_debug_info
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).
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:- pred optimize__maybe_opt_debug(list(instruction)::in, counter::in,
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string::in, opt_debug_info::in, opt_debug_info::out,
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io::di, io::uo) is det.
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optimize__maybe_opt_debug(Instrs, Counter, Msg, OptDebugInfo0, OptDebugInfo,
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!IO) :-
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(
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OptDebugInfo0 = opt_debug_info(BaseName, OptNum0),
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OptNum = OptNum0 + 1,
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string__int_to_string(OptNum0, OptNum0Str),
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string__int_to_string(OptNum, OptNumStr),
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string__append_list([BaseName, ".opt", OptNum0Str],
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OptFileName0),
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string__append_list([BaseName, ".opt", OptNumStr],
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OptFileName),
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string__append_list([BaseName, ".diff", OptNumStr],
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DiffFileName),
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io__open_output(OptFileName, Res, !IO),
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( Res = ok(FileStream) ->
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io__set_output_stream(FileStream, OutputStream, !IO),
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counter__allocate(NextLabel, Counter, _),
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opt_debug__msg(yes, NextLabel, Msg, !IO),
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opt_debug__dump_instrs(yes, Instrs, !IO),
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io__set_output_stream(OutputStream, _, !IO),
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io__close_output(FileStream, !IO)
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;
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string__append("cannot open ", OptFileName,
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ErrorMsg),
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error(ErrorMsg)
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),
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% Although the -u is not fully portable, it is available
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% on all the systems we intend to use it on, and the main user
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% of --debug-opt (zs) strongly prefers -u to -c.
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string__append_list(["diff -u ",
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OptFileName0, " ", OptFileName,
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" > ", DiffFileName], DiffCommand),
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io__call_system(DiffCommand, _, !IO),
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OptDebugInfo = opt_debug_info(BaseName, OptNum)
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;
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OptDebugInfo0 = no_opt_debug_info,
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OptDebugInfo = no_opt_debug_info
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).
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%-----------------------------------------------------------------------------%
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:- pred optimize__initial(set(label)::in, proc_label::in, may_alter_rtti::in,
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counter::in, counter::out, opt_debug_info::in, opt_debug_info::out,
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list(instruction)::in, list(instruction)::out, io::di, io::uo) is det.
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optimize__initial(LayoutLabelSet, ProcLabel, MayAlterRtti, !C, !OptDebugInfo,
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!Instrs, !IO) :-
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globals__io_lookup_bool_option(very_verbose, VeryVerbose, !IO),
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opt_util__find_first_label(!.Instrs, Label),
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opt_util__format_label(Label, LabelStr),
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globals__io_lookup_bool_option(optimize_frames, FrameOpt, !IO),
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(
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FrameOpt = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing nondet frames for ",
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!IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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frameopt_nondet(ProcLabel, LayoutLabelSet, MayAlterRtti, !C,
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!Instrs, _Mod),
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optimize__maybe_opt_debug(!.Instrs, !.C,
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"after nondet frame opt", !OptDebugInfo, !IO)
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;
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FrameOpt = no
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).
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%-----------------------------------------------------------------------------%
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:- pred optimize__repeat(int::in, set(label)::in, proc_label::in,
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may_alter_rtti::in, counter::in, counter::out,
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opt_debug_info::in, opt_debug_info::out,
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list(instruction)::in, list(instruction)::out, io::di, io::uo) is det.
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optimize__repeat(CurIter, LayoutLabelSet, ProcLabel, MayAlterRtti,
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!C, !OptDebugInfo, !Instrs, !IO) :-
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( CurIter > 0 ->
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NextIter = CurIter - 1,
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( NextIter = 0 ->
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Final = yes
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;
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Final = no
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),
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optimize__repeated(Final, LayoutLabelSet, ProcLabel,
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MayAlterRtti, !C, !OptDebugInfo,
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!Instrs, Mod, !IO),
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(
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Mod = yes,
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optimize__repeat(NextIter, LayoutLabelSet, ProcLabel,
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MayAlterRtti, !C, !OptDebugInfo, !Instrs, !IO)
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;
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Mod = no
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)
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;
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true
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).
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% We short-circuit jump sequences before normal peepholing
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% to create more opportunities for use of the tailcall macro.
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:- pred optimize__repeated(bool::in, set(label)::in, proc_label::in,
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may_alter_rtti::in, counter::in, counter::out,
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opt_debug_info::in, opt_debug_info::out,
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list(instruction)::in, list(instruction)::out, bool::out,
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io::di, io::uo) is det.
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optimize__repeated(Final, LayoutLabelSet, ProcLabel, MayAlterRtti,
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!C, !OptDebugInfo, !Instrs, Mod, !IO) :-
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InstrsAtStart = !.Instrs,
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opt_util__find_first_label(!.Instrs, Label),
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proc_label_to_c_string(get_proc_label(Label), no) = LabelStr,
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globals__io_lookup_bool_option(very_verbose, VeryVerbose, !IO),
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globals__io_lookup_bool_option(optimize_jumps, Jumpopt, !IO),
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globals__io_lookup_bool_option(optimize_fulljumps, FullJumpopt, !IO),
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globals__io_lookup_bool_option(pessimize_tailcalls,
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PessimizeTailCalls, !IO),
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globals__io_lookup_bool_option(checked_nondet_tailcalls,
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CheckedNondetTailCalls, !IO),
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(
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Jumpopt = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing jumps for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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jumpopt_main(LayoutLabelSet, MayAlterRtti, ProcLabel,
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FullJumpopt, Final, PessimizeTailCalls,
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CheckedNondetTailCalls, !C, !Instrs, Mod1),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after jump opt",
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!OptDebugInfo, !IO)
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;
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Jumpopt = no,
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Mod1 = no
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),
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globals__io_lookup_bool_option(optimize_peep, Peephole, !IO),
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(
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Peephole = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing locally for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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globals__io_get_gc_method(GC_Method, !IO),
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peephole__optimize(GC_Method, !Instrs, Mod2),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after peephole",
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!OptDebugInfo, !IO)
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;
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Peephole = no,
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Mod2 = no
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),
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globals__io_lookup_bool_option(optimize_labels, LabelElim, !IO),
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(
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LabelElim = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing labels for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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labelopt_main(Final, LayoutLabelSet, !Instrs, Mod3),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after label opt",
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!OptDebugInfo, !IO)
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;
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LabelElim = no,
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Mod3 = no
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),
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globals__io_lookup_bool_option(optimize_dups, DupElim, !IO),
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(
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DupElim = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing duplicates for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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dupelim_main(ProcLabel, !C, !Instrs),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after duplicates",
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!OptDebugInfo, !IO)
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;
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DupElim = no
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),
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( Mod1 = no, Mod2 = no, Mod3 = no, !.Instrs = InstrsAtStart ->
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Mod = no
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;
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Mod = yes
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),
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globals__io_lookup_bool_option(statistics, Statistics, !IO),
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maybe_report_stats(Statistics, !IO).
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:- pred optimize__middle(bool::in, set(label)::in, proc_label::in,
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may_alter_rtti::in, counter::in, counter::out,
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opt_debug_info::in, opt_debug_info::out,
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list(instruction)::in, list(instruction)::out, io::di, io::uo) is det.
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optimize__middle(Final, LayoutLabelSet, ProcLabel, MayAlterRtti, !C,
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!OptDebugInfo, !Instrs, !IO) :-
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globals__io_lookup_bool_option(very_verbose, VeryVerbose, !IO),
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opt_util__find_first_label(!.Instrs, Label),
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opt_util__format_label(Label, LabelStr),
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globals__io_lookup_bool_option(optimize_frames, FrameOpt, !IO),
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(
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FrameOpt = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing frames for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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frameopt_main(ProcLabel, !C, !Instrs, Mod1, Jumps),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after frame opt",
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!OptDebugInfo, !IO),
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globals__io_lookup_bool_option(optimize_fulljumps,
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FullJumpopt, !IO),
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globals__io_lookup_bool_option(pessimize_tailcalls,
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PessimizeTailCalls, !IO),
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globals__io_lookup_bool_option(checked_nondet_tailcalls,
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CheckedNondetTailCalls, !IO),
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(
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Jumps = yes,
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FullJumpopt = yes
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->
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing jumps for ",
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!IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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jumpopt_main(LayoutLabelSet, MayAlterRtti, ProcLabel,
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FullJumpopt, Final, PessimizeTailCalls,
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CheckedNondetTailCalls, !C, !Instrs, _Mod2),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after jumps",
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!OptDebugInfo, !IO)
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;
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true
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),
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(
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Mod1 = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing labels for ",
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!IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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labelopt_main(Final, LayoutLabelSet, !Instrs, _Mod3),
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optimize__maybe_opt_debug(!.Instrs, !.C, "after labels",
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!OptDebugInfo, !IO)
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;
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Mod1 = no
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)
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;
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FrameOpt = no
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),
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globals__io_lookup_bool_option(use_local_vars, UseLocalVars, !IO),
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(
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UseLocalVars = yes,
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(
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VeryVerbose = yes,
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io__write_string("% Optimizing local vars for ", !IO),
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io__write_string(LabelStr, !IO),
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io__write_string("\n", !IO)
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;
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VeryVerbose = no
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),
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globals__io_lookup_int_option(num_real_r_regs, NumRealRRegs,
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!IO),
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globals__io_lookup_int_option(local_var_access_threshold,
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AccessThreshold, !IO),
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use_local_vars__main(!Instrs, ProcLabel, NumRealRRegs,
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AccessThreshold, !C),
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optimize__maybe_opt_debug(!.Instrs, !.C,
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"after use_local_vars", !OptDebugInfo, !IO)
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;
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UseLocalVars = no
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).
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:- pred optimize__last(set(label)::in, counter::in, opt_debug_info::in,
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list(instruction)::in, list(instruction)::out, io::di, io::uo) is det.
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optimize__last(LayoutLabelSet, C, !.OptDebugInfo, !Instrs, !IO) :-
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|
globals__io_lookup_bool_option(very_verbose, VeryVerbose, !IO),
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|
opt_util__find_first_label(!.Instrs, Label),
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|
opt_util__format_label(Label, LabelStr),
|
|
|
|
globals__io_lookup_bool_option(optimize_reassign, Reassign, !IO),
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|
globals__io_lookup_bool_option(optimize_delay_slot, DelaySlot, !IO),
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|
globals__io_lookup_bool_option(use_local_vars, UseLocalVars, !IO),
|
|
(
|
|
( Reassign = yes
|
|
; DelaySlot = yes
|
|
; UseLocalVars = yes
|
|
)
|
|
->
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|
% We must get rid of any extra labels added by other passes,
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|
% since they can confuse reassign, wrap_blocks and delay_slot.
|
|
(
|
|
VeryVerbose = yes,
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|
io__write_string("% Optimizing labels for ", !IO),
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|
io__write_string(LabelStr, !IO),
|
|
io__write_string("\n", !IO)
|
|
;
|
|
VeryVerbose = no
|
|
),
|
|
labelopt_main(no, LayoutLabelSet, !Instrs, _Mod1),
|
|
optimize__maybe_opt_debug(!.Instrs, C, "after label opt",
|
|
!OptDebugInfo, !IO)
|
|
;
|
|
true
|
|
),
|
|
(
|
|
Reassign = yes,
|
|
(
|
|
VeryVerbose = yes,
|
|
io__write_string("% Optimizing reassign for ", !IO),
|
|
io__write_string(LabelStr, !IO),
|
|
io__write_string("\n", !IO)
|
|
;
|
|
VeryVerbose = no
|
|
),
|
|
remove_reassign(!Instrs),
|
|
optimize__maybe_opt_debug(!.Instrs, C, "after reassign",
|
|
!OptDebugInfo, !IO)
|
|
;
|
|
Reassign = no
|
|
),
|
|
(
|
|
DelaySlot = yes,
|
|
(
|
|
VeryVerbose = yes,
|
|
io__write_string("% Optimizing delay slot for ", !IO),
|
|
io__write_string(LabelStr, !IO),
|
|
io__write_string("\n", !IO)
|
|
;
|
|
VeryVerbose = no
|
|
),
|
|
fill_branch_delay_slot(!Instrs),
|
|
optimize__maybe_opt_debug(!.Instrs, C, "after delay slots",
|
|
!OptDebugInfo, !IO)
|
|
;
|
|
DelaySlot = no
|
|
),
|
|
(
|
|
UseLocalVars = yes,
|
|
(
|
|
VeryVerbose = yes,
|
|
io__write_string("% Wrapping blocks for ", !IO),
|
|
io__write_string(LabelStr, !IO),
|
|
io__write_string("\n", !IO)
|
|
;
|
|
VeryVerbose = no
|
|
),
|
|
wrap_blocks(!Instrs),
|
|
optimize__maybe_opt_debug(!.Instrs, C, "after wrap blocks",
|
|
!.OptDebugInfo, _OptDebugInfo, !IO)
|
|
;
|
|
UseLocalVars = no
|
|
).
|