%%% -*- erlang-indent-level: 2 -*-
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%%% Copyright Ericsson AB 2004-2016. All Rights Reserved.
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%%% 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
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%%% http://www.apache.org/licenses/LICENSE-2.0
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%%% distributed under the License is distributed on an "AS IS" BASIS,
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%%% Common wrapper for graph_coloring and coalescing regallocs.
-module(hipe_regalloc_loop).
-export([ra/5, ra_fp/4]).
%%-define(HIPE_INSTRUMENT_COMPILER, true). %% Turn on instrumentation.
-include("../main/hipe.hrl").
ra(CFG, SpillIndex, Options, RegAllocMod, TargetMod) ->
{NewCFG, Coloring, _NewSpillIndex} =
ra_common(CFG, SpillIndex, Options, RegAllocMod, TargetMod),
{NewCFG, Coloring}.
ra_fp(CFG, Options, RegAllocMod, TargetMod) ->
ra_common(CFG, 0, Options, RegAllocMod, TargetMod).
ra_common(CFG0, SpillIndex, Options, RegAllocMod, TargetMod) ->
?inc_counter(ra_calls_counter, 1),
SpillLimit0 = TargetMod:number_of_temporaries(CFG0),
{Coloring, _, CFG, MaybeLiveness} =
call_allocator_initial(CFG0, SpillLimit0, SpillIndex, Options, RegAllocMod,
TargetMod),
%% The first iteration, the hipe_regalloc_prepass may create new temps, these
%% should not end up above SpillLimit.
SpillLimit = TargetMod:number_of_temporaries(CFG),
alloc(Coloring, CFG, MaybeLiveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod).
alloc(Coloring, CFG0, MaybeLiveness0, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod) ->
?inc_counter(ra_iteration_counter, 1),
{CFG, DidSpill} = TargetMod:check_and_rewrite(CFG0, Coloring),
case DidSpill of
false -> %% No new temps, we are done.
?add_spills(Options, _NewSpillIndex),
TempMap = hipe_temp_map:cols2tuple(Coloring, TargetMod),
Liveness = liveness_force(TargetMod, CFG0, MaybeLiveness0),
{TempMap2, NewSpillIndex2} =
hipe_spillmin:stackalloc(CFG0, Liveness, [], SpillIndex, Options,
TargetMod, TempMap),
Coloring2 =
hipe_spillmin:mapmerge(hipe_temp_map:to_substlist(TempMap), TempMap2),
%% case proplists:get_bool(verbose_spills, Options) of
%% true ->
%% ?msg("Num spill slots used: ~p~n", [NewSpillIndex2-SpillIndex]);
%% false ->
%% ok
%% end,
{CFG, Coloring2, NewSpillIndex2};
_ ->
%% Since SpillLimit is used as a low-water-mark
%% the list of temps not to spill is uninteresting.
{NewColoring, _NewSpillIndex, Liveness} =
call_allocator(CFG, SpillLimit, SpillIndex, Options, RegAllocMod,
TargetMod),
alloc(NewColoring, CFG, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod)
end.
call_allocator_initial(CFG, SpillLimit, SpillIndex, Options, RegAllocMod,
TargetMod) ->
case proplists:get_bool(ra_prespill, Options) of
true ->
hipe_regalloc_prepass:regalloc_initial(
RegAllocMod, CFG, SpillIndex, SpillLimit, TargetMod, Options);
false ->
{C, SI, L} = RegAllocMod:regalloc(CFG, SpillIndex, SpillLimit,
TargetMod, Options),
{C, SI, CFG, L}
end.
call_allocator(CFG, SpillLimit, SpillIndex, Options, RegAllocMod, TargetMod) ->
case proplists:get_bool(ra_prespill, Options) of
true ->
hipe_regalloc_prepass:regalloc(
RegAllocMod, CFG, SpillIndex, SpillLimit, TargetMod, Options);
false ->
RegAllocMod:regalloc(CFG, SpillIndex, SpillLimit, TargetMod, Options)
end.
liveness_force(TargetMod, CFG, undefined) -> TargetMod:analyze(CFG);
liveness_force(_TargetMod, _CFG, Defined) -> Defined.
