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%% -*- erlang-indent-level: 2 -*-
%%=====================================================================
%%
%% Driver module for register allocation of SPARC code.
%%
%%=====================================================================
-module(hipe_sparc_ra).
-export([allocate/3]).
-define(HIPE_INSTRUMENT_COMPILER, true). %% Turn on instrumentation.
-include("../main/hipe.hrl").
-include("hipe_sparc.hrl").
%%---------------------------------------------------------------------
allocate(_Fun, SparcCfg0, Options) ->
?inc_counter(ra_caller_saves_counter,count_caller_saves(SparcCfg0)),
?opt_start_timer("Regalloc"),
?start_ra_instrumentation(Options,
count_instrs_cfg(SparcCfg0),
hipe_gensym:get_var(sparc)),
SparcCfg = hipe_sparc_multimove:remove_multimoves(SparcCfg0),
{NewCfg, TempMap, NextPos} =
case proplists:get_value(regalloc,Options) of
linear_scan ->
hipe_sparc_ra_ls:alloc(SparcCfg, Options);
graph_color ->
ra(SparcCfg, Options, hipe_graph_coloring_regalloc);
coalescing ->
ra(SparcCfg, Options, hipe_coalescing_regalloc);
optimistic ->
ra(SparcCfg, Options, hipe_optimistic_regalloc);
naive ->
hipe_sparc_ra_naive:alloc(SparcCfg, Options);
_ -> %% linear_scan made default register allocator
hipe_sparc_ra_ls:alloc(SparcCfg, Options)
end,
?opt_stop_timer("Regalloc done"),
?stop_ra_instrumentation(Options,
count_instrs_cfg(NewCfg),
hipe_gensym:get_var(NewCfg)),
{NewCfg2, FpMap, NextPos2} =
case get(hipe_inline_fp) of
true ->
hipe_sparc_ra_fp_ls:alloc(NewCfg, Options, NextPos, TempMap);
_ ->
{NewCfg, [], NextPos}
end,
{NewCfg3, NextPos3} =
hipe_sparc_caller_saves:rewrite(NewCfg2, TempMap, FpMap,
NextPos2, Options),
{{NewCfg3,TempMap, NextPos3}, FpMap}.
%%---------------------------------------------------------------------
%%
%% Generic interface for register allocating SPARC code via a coloring
%% based scheme (graph_color, iterated or optimistic coalescing).
%%
%%---------------------------------------------------------------------
ra(SparcCfg, Options, Method) ->
SpillLimit = hipe_gensym:get_var(sparc),
ra(SparcCfg, SpillLimit, Options, Method).
ra(SparcCfg, SpillLimit, Options, Method) ->
?inc_counter(ra_iteration_counter,1),
{Map, _NewSpillIndex} = Method:regalloc(SparcCfg, 0, SpillLimit,
hipe_sparc_specific, Options),
TempMap = cols2tuple(Map),
{NewCfg, DontSpill} =
hipe_sparc_ra_postconditions:rewrite(SparcCfg, TempMap, [], Options),
case DontSpill of
[] ->
%% Code to minimize stack size by allocation of temps to spillpositions
{TempMap2, NewSpillIndex2} =
hipe_spillmin:stackalloc(NewCfg, [], 0, Options,
hipe_sparc_specific, TempMap),
TempMap3 =
hipe_spillmin:mapmerge(hipe_temp_map:to_substlist(TempMap),
TempMap2),
TempMap4 = cols2tuple(TempMap3),
?add_spills(Options, NewSpillIndex2),
{NewCfg, TempMap4, NewSpillIndex2};
_ ->
%% Since SpillLimit is used as a low-water mark
%% the list of temps not to spill is uninteresting.
ra(NewCfg, SpillLimit, Options, Method)
end.
%%
%% Converts a list of [{R1, C1}, {R2, C2}, ...} to a tuple {C17, C23, ...}.
%%
%% The N's must be unique but do not have to be sorted and they can be sparse.
%%
cols2tuple(Map) ->
hipe_temp_map:cols2tuple(Map, hipe_sparc_specific).
%%---------------------------------------------------------------------
%% This is only an info-gathering function used for benchmarking
%% purposes
%%---------------------------------------------------------------------
count_caller_saves(CFG) ->
Liveness = hipe_sparc_liveness:analyze(CFG),
count_caller_saves(CFG, Liveness, hipe_sparc_specific).
count_caller_saves(CFG, Liveness, T) ->
%% Count how many temps are live over a call.
length(
%% Fold the count for each basic block.
lists:foldr(
%% For each BB, take the set of CallerSaves from previous BBs
fun(L, CallerSaves) ->
%% Just keep temps that are not precoloured.
[ X ||
%% Get the set of caller saves (from {Liveness, CS}).
X <- element(2,
%% Fold each instruction in the BB (backwards).
lists:foldr(
%% For each instruction
fun(I,{LiveOut,CS}) ->
%% Calculate live-in
UsesSet = ordsets:from_list(uses(I,T)),
DefsSet = ordsets:from_list(defines(I,T)),
LiveOverI = ordsets:subtract(LiveOut, DefsSet),
NewCS =
case I of
%% If this is a call instruction, keep the CS-temps.
#call_link{} ->
ordsets:union(CS,LiveOverI);
_ -> CS
end,
NewLiveOut =
ordsets:union(LiveOverI, UsesSet),
{NewLiveOut,NewCS}
end,
%% Start with live out of the BB
{ordsets:from_list(liveout(Liveness,L,T)),
CallerSaves},
%% Get the instructions in the BB.
hipe_bb:code(T:bb(CFG,L)))),
%% Filter
not T:is_precoloured(X)]
end,
[],
%% Get BBs
T:labels(CFG))).
liveout(Liveness, L, Target)->
regnames(Target:liveout(Liveness, L), Target).
uses(I, Target)->
regnames(Target:uses(I), Target).
defines(I, Target) ->
regnames(Target:defines(I), Target).
regnames(Regs2, Target) ->
Regs =
case Target of
hipe_sparc_specific ->
hipe_sparc:keep_registers(Regs2);
_ ->
Regs2
end,
[Target:reg_nr(X) || X <- Regs].
%%---------------------------------------------------------------------
%% The following is needed for taking measurements.
%%---------------------------------------------------------------------
count_instrs_cfg(CFG) ->
count_instrs(hipe_sparc:sparc_code(hipe_sparc_cfg:linearize(CFG))).
count_instrs(Code) ->
count_instrs(Code, 0).
count_instrs([Instr|Is], Acc) ->
count_instrs(Is, Acc + icount(Instr));
count_instrs([],Acc) -> Acc.
icount(I) ->
case I of
#label{} ->
0;
#comment{} ->
0;
#load_address{} ->
2;
#multimove{} ->
%% These should have been removed before assembly...
%% To be on the safe side, we calculate that we need one extra
%% move (to a temp) for each register that need to be moved.
%% I.e., [r1,r2] <- [r3, r4] can be handled as:
%% r5 <- r3
%% r6 <- r4
%% r1 <- r5
%% r2 <- r6
length(hipe_sparc:multimove_dest(I)) * 2;
_Other ->
1
end.
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