%% -*- 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.
-module(hipe_amd64_ra_sse2_postconditions).
-export([check_and_rewrite/2, check_and_rewrite/3]).
-include("../x86/hipe_x86.hrl").
-define(HIPE_INSTRUMENT_COMPILER, true).
-include("../main/hipe.hrl").
-define(count_temp(T), ?cons_counter(counter_mfa_mem_temps, T)).
check_and_rewrite(AMD64CFG, Coloring) ->
check_and_rewrite(AMD64CFG, Coloring, 'normal').
check_and_rewrite(AMD64CFG, Coloring, Strategy) ->
%%io:format("Converting\n"),
TempMap = hipe_temp_map:cols2tuple(Coloring,hipe_amd64_specific_sse2,no_context),
%%io:format("Rewriting\n"),
do_bbs(hipe_x86_cfg:labels(AMD64CFG), TempMap, Strategy, AMD64CFG, false).
do_bbs([], _, _, CFG, DidSpill) -> {CFG, DidSpill};
do_bbs([Lbl|Lbls], TempMap, Strategy, CFG0, DidSpill0) ->
Code0 = hipe_bb:code(BB = hipe_x86_cfg:bb(CFG0, Lbl)),
{Code, DidSpill} = do_insns(Code0, TempMap, Strategy, [], DidSpill0),
CFG = hipe_x86_cfg:bb_add(CFG0, Lbl, hipe_bb:code_update(BB, Code)),
do_bbs(Lbls, TempMap, Strategy, CFG, DidSpill).
do_insns([I|Insns], TempMap, Strategy, Accum, DidSpill0) ->
{NewIs, DidSpill1} = do_insn(I, TempMap, Strategy),
do_insns(Insns, TempMap, Strategy, lists:reverse(NewIs, Accum),
DidSpill0 or DidSpill1);
do_insns([], _TempMap, _Strategy, Accum, DidSpill) ->
{lists:reverse(Accum), DidSpill}.
do_insn(I, TempMap, Strategy) -> % Insn -> {Insn list, DidSpill}
case I of
#fmove{} ->
do_fmove(I, TempMap, Strategy);
#fp_unop{} ->
do_fp_unop(I, TempMap, Strategy);
#fp_binop{} ->
do_fp_binop(I, TempMap, Strategy);
#pseudo_spill_fmove{} ->
do_pseudo_spill_fmove(I, TempMap, Strategy);
_ ->
%% All non sse2 ops
{[I], false}
end.
%%% Fix an fp_binop.
do_fp_binop(I, TempMap, Strategy) ->
#fp_binop{src=Src,dst=Dst} = I,
case is_mem_opnd(Dst, TempMap) of
true ->
Tmp = clone(Dst, Strategy),
{[#fmove{src=Dst, dst=Tmp},
I#fp_binop{src=Src,dst=Tmp},
#fmove{src=Tmp,dst=Dst}],
true};
false ->
{[I], false}
end.
do_fp_unop(I, TempMap, Strategy) ->
#fp_unop{arg=Arg} = I,
case is_mem_opnd(Arg, TempMap) of
true ->
Tmp = clone(Arg, Strategy),
{[#fmove{src=Arg, dst=Tmp},
I#fp_unop{arg=Tmp},
#fmove{src=Tmp,dst=Arg}],
true};
false ->
{[I], false}
end.
%%% Fix an fmove op.
do_fmove(I, TempMap, Strategy) ->
#fmove{src=Src,dst=Dst} = I,
case
(is_mem_opnd(Src, TempMap) andalso is_mem_opnd(Dst, TempMap))
orelse (is_mem_opnd(Src, TempMap) andalso (not is_float_temp(Dst)))
orelse ((not is_float_temp(Src)) andalso is_mem_opnd(Dst, TempMap))
of
true ->
Tmp = spill_temp(double, Strategy),
%% pseudo_spill_fmove allows spill slot move coalescing, but must not
%% contain memory operands (except for spilled temps)
Is = case is_float_temp(Src) andalso is_float_temp(Dst) of
true -> [#pseudo_spill_fmove{src=Src, temp=Tmp, dst=Dst}];
false -> [#fmove{src=Src, dst=Tmp},I#fmove{src=Tmp,dst=Dst}]
end,
{Is, true};
false ->
{[I], false}
end.
is_float_temp(#x86_temp{type=Type}) -> Type =:= double;
is_float_temp(#x86_mem{}) -> false.
%%% Fix an pseudo_spill_fmove op.
do_pseudo_spill_fmove(I = #pseudo_spill_fmove{temp=Temp}, TempMap, _Strategy) ->
%% Temp is above the low water mark and must not have been spilled
false = is_mem_opnd(Temp, TempMap),
{[I], false}. % nothing to do
%%% Check if an operand denotes a memory cell (mem or pseudo).
is_mem_opnd(Opnd, TempMap) ->
case Opnd of
#x86_mem{} -> true;
#x86_temp{type=double} ->
Reg = hipe_x86:temp_reg(Opnd),
case hipe_x86:temp_is_allocatable(Opnd) of
true ->
case hipe_temp_map:is_spilled(Reg, TempMap) of
true ->
?count_temp(Reg),
true;
false -> false
end;
false -> true
end;
_ -> false
end.
%%% Make Reg a clone of Dst (attach Dst's type to Reg).
clone(Dst, Strategy) ->
Type =
case Dst of
#x86_mem{} -> hipe_x86:mem_type(Dst);
#x86_temp{} -> hipe_x86:temp_type(Dst)
end,
spill_temp(Type, Strategy).
spill_temp(Type, 'normal') ->
hipe_x86:mk_new_temp(Type);
spill_temp(double, 'linearscan') ->
hipe_x86:mk_temp(hipe_amd64_specific_sse2:temp0(no_context), double);
spill_temp(Type, 'linearscan') when Type =:= tagged; Type =/= untagged ->
%% We can make a new temp here since we have yet to allocate registers for
%% these types
hipe_x86:mk_new_temp(Type).
%%% Make a certain reg into a clone of Dst
%% clone2(Dst, Reg) ->
%% Type =
%% case Dst of
%% #x86_mem{} -> hipe_x86:mem_type(Dst);
%% #x86_temp{} -> hipe_x86:temp_type(Dst)
%% end,
%% hipe_x86:mk_temp(Reg,Type).
