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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.
%%%
%%% Common wrapper for graph_coloring and coalescing regallocs.
-module(hipe_regalloc_loop).
-export([ra/7, ra_fp/6]).
%%-define(HIPE_INSTRUMENT_COMPILER, true). %% Turn on instrumentation.
-include("../main/hipe.hrl").
ra(CFG, Liveness0, SpillIndex, Options, RegAllocMod, TargetMod, TargetCtx) ->
{NewCFG, Liveness, Coloring, _NewSpillIndex} =
ra_common(CFG, Liveness0, SpillIndex, Options, RegAllocMod, TargetMod,
TargetCtx),
{NewCFG, Liveness, Coloring}.
ra_fp(CFG, Liveness, Options, RegAllocMod, TargetMod, TargetCtx) ->
ra_common(CFG, Liveness, 0, Options, RegAllocMod, TargetMod, TargetCtx).
ra_common(CFG0, Liveness0, SpillIndex, Options, RegAllocMod, TargetMod,
TargetCtx) ->
?inc_counter(ra_calls_counter, 1),
{CFG1, Liveness1} =
do_range_split(CFG0, Liveness0, TargetMod, TargetCtx, Options),
SpillLimit0 = TargetMod:number_of_temporaries(CFG1, TargetCtx),
{Coloring, _, CFG, Liveness} =
call_allocator_initial(CFG1, Liveness1, SpillLimit0, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx),
%% The first iteration, the hipe_regalloc_prepass may create new temps, these
%% should not end up above SpillLimit.
SpillLimit = TargetMod:number_of_temporaries(CFG, TargetCtx),
alloc(Coloring, CFG, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx).
alloc(Coloring, CFG0, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx) ->
?inc_counter(ra_iteration_counter, 1),
{CFG, DidSpill} = TargetMod:check_and_rewrite(CFG0, Coloring, TargetCtx),
case DidSpill of
false -> %% No new temps, we are done.
?add_spills(Options, _NewSpillIndex),
TempMap = hipe_temp_map:cols2tuple(Coloring, TargetMod, TargetCtx),
{TempMap2, NewSpillIndex2} =
hipe_spillmin:stackalloc(CFG0, Liveness, [], SpillIndex, Options,
TargetMod, TargetCtx, 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, Liveness, Coloring2, NewSpillIndex2};
_ ->
%% Since SpillLimit is used as a low-water-mark
%% the list of temps not to spill is uninteresting.
{NewColoring, _NewSpillIndex} =
call_allocator(CFG, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx),
alloc(NewColoring, CFG, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx)
end.
call_allocator_initial(CFG, Liveness, SpillLimit, SpillIndex, Options,
RegAllocMod, TargetMod, TargetCtx) ->
case proplists:get_bool(ra_prespill, Options) of
true ->
hipe_regalloc_prepass:regalloc_initial(
RegAllocMod, CFG, Liveness, SpillIndex, SpillLimit, TargetMod,
TargetCtx, Options);
false ->
{C, SI} = RegAllocMod:regalloc(CFG, Liveness, SpillIndex, SpillLimit,
TargetMod, TargetCtx, Options),
{C, SI, CFG, Liveness}
end.
call_allocator(CFG, Liveness, SpillLimit, SpillIndex, Options, RegAllocMod,
TargetMod, TargetCtx) ->
case proplists:get_bool(ra_prespill, Options) of
true ->
hipe_regalloc_prepass:regalloc(
RegAllocMod, CFG, Liveness, SpillIndex, SpillLimit, TargetMod,
TargetCtx, Options);
false ->
RegAllocMod:regalloc(CFG, Liveness, SpillIndex, SpillLimit, TargetMod,
TargetCtx, Options)
end.
do_range_split(CFG0, Liveness, TgtMod, TgtCtx, Options) ->
case proplists:get_bool(ra_restore_reuse, Options) of
true ->
CFG1 = hipe_restore_reuse:split(CFG0, Liveness, TgtMod, TgtCtx),
{CFG1, TgtMod:analyze(CFG1, TgtCtx)};
false ->
{CFG0, Liveness}
end.
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