%% -*- 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_sparc_ra_postconditions).
-export([check_and_rewrite/3, check_and_rewrite2/3]).
-include("hipe_sparc.hrl").
check_and_rewrite(CFG, Coloring, Allocator) ->
TempMap = hipe_temp_map:cols2tuple(Coloring, hipe_sparc_specific, no_context),
check_and_rewrite2(CFG, TempMap, Allocator).
check_and_rewrite2(CFG, TempMap, Allocator) ->
Strategy = strategy(Allocator),
do_bbs(hipe_sparc_cfg:labels(CFG), TempMap, Strategy, CFG, false).
strategy(Allocator) ->
case Allocator of
'normal' -> 'new';
'linearscan' -> 'fixed';
'naive' -> 'fixed'
end.
do_bbs([], _, _, CFG, DidSpill) -> {CFG, DidSpill};
do_bbs([Lbl|Lbls], TempMap, Strategy, CFG0, DidSpill0) ->
Code0 = hipe_bb:code(BB = hipe_sparc_cfg:bb(CFG0, Lbl)),
{Code, DidSpill} = do_insns(Code0, TempMap, Strategy, [], DidSpill0),
CFG = hipe_sparc_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) ->
case I of
#alu{} -> do_alu(I, TempMap, Strategy);
#jmp{} -> do_jmp(I, TempMap, Strategy);
%% #pseudo_br{} -> do_pseudo_br(I, TempMap, Strategy);
#pseudo_call{} -> do_pseudo_call(I, TempMap, Strategy);
#pseudo_move{} -> do_pseudo_move(I, TempMap, Strategy);
#pseudo_set{} -> do_pseudo_set(I, TempMap, Strategy);
#pseudo_spill_move{} -> do_pseudo_spill_move(I, TempMap, Strategy);
#pseudo_tailcall{} -> do_pseudo_tailcall(I, TempMap, Strategy);
#rdy{} -> do_rdy(I, TempMap, Strategy);
#sethi{} -> do_sethi(I, TempMap, Strategy);
#store{} -> do_store(I, TempMap, Strategy);
#pseudo_fload{} -> do_pseudo_fload(I, TempMap, Strategy);
#pseudo_fstore{} -> do_pseudo_fstore(I, TempMap, Strategy);
_ -> {[I], false}
end.
%%% Fix relevant instruction types.
do_alu(I=#alu{dst=Dst,src1=Src1,src2=Src2}, TempMap, Strategy) ->
{FixDst,NewDst,DidSpill1} = fix_dst(Dst, TempMap, Strategy),
{FixSrc1,NewSrc1,DidSpill2} = fix_src1(Src1, TempMap, Strategy),
{FixSrc2,NewSrc2,DidSpill3} = fix_src2_or_imm(Src2, TempMap, Strategy),
NewI = I#alu{dst=NewDst,src1=NewSrc1,src2=NewSrc2},
{FixSrc1 ++ FixSrc2 ++ [NewI | FixDst], DidSpill1 or DidSpill2 or DidSpill3}.
do_jmp(I=#jmp{src1=Src1,src2=Src2}, TempMap, Strategy) ->
{FixSrc1,NewSrc1,DidSpill1} = fix_src1(Src1, TempMap, Strategy),
{FixSrc2,NewSrc2,DidSpill2} = fix_src2_or_imm(Src2, TempMap, Strategy),
NewI = I#jmp{src1=NewSrc1,src2=NewSrc2},
{FixSrc1 ++ FixSrc2 ++ [NewI], DidSpill1 or DidSpill2}.
-ifdef(notdef). % XXX: only for sparc64, alas
do_pseudo_br(I=#pseudo_br{src=Src}, TempMap, Strategy) ->
{FixSrc,NewSrc,DidSpill} = fix_src1(Src, TempMap, Strategy),
NewI = I#pseudo_br{src=NewSrc},
{FixSrc ++ [NewI], DidSpill}.
-endif.
do_pseudo_call(I=#pseudo_call{funv=FunV}, TempMap, Strategy) ->
{FixFunV,NewFunV,DidSpill} = fix_funv(FunV, TempMap, Strategy),
NewI = I#pseudo_call{funv=NewFunV},
{FixFunV ++ [NewI], DidSpill}.
do_pseudo_move(I=#pseudo_move{src=Src,dst=Dst}, TempMap, Strategy) ->
%% Either Dst or Src (but not both) may be a pseudo temp.
%% pseudo_move and pseudo_spill_move [XXX: not pseudo_tailcall]
%% are special cases: in all other instructions, all temps must
%% be non-pseudos after register allocation.
case temp_is_spilled(Src, TempMap)
andalso temp_is_spilled(Dst, TempMap)
of
true -> % Turn into pseudo_spill_move
Temp = clone(Src, temp1(Strategy)),
NewI = #pseudo_spill_move{src=Src,temp=Temp,dst=Dst},
{[NewI], true};
_ ->
{[I], false}
end.
do_pseudo_set(I=#pseudo_set{dst=Dst}, TempMap, Strategy) ->
{FixDst,NewDst,DidSpill} = fix_dst(Dst, TempMap, Strategy),
NewI = I#pseudo_set{dst=NewDst},
{[NewI | FixDst], DidSpill}.
do_pseudo_spill_move(I=#pseudo_spill_move{temp=Temp}, TempMap, _Strategy) ->
%% Temp is above the low water mark and must not have been spilled
false = temp_is_spilled(Temp, TempMap),
{[I], false}.
do_pseudo_tailcall(I=#pseudo_tailcall{funv=FunV}, TempMap, Strategy) ->
{FixFunV,NewFunV,DidSpill} = fix_funv(FunV, TempMap, Strategy),
NewI = I#pseudo_tailcall{funv=NewFunV},
{FixFunV ++ [NewI], DidSpill}.
do_rdy(I=#rdy{dst=Dst}, TempMap, Strategy) ->
{FixDst,NewDst,DidSpill} = fix_dst(Dst, TempMap, Strategy),
NewI = I#rdy{dst=NewDst},
{[NewI | FixDst], DidSpill}.
do_sethi(I=#sethi{dst=Dst}, TempMap, Strategy) ->
{FixDst,NewDst,DidSpill} = fix_dst(Dst, TempMap, Strategy),
NewI = I#sethi{dst=NewDst},
{[NewI | FixDst], DidSpill}.
do_store(I=#store{src=Src,base=Base,disp=Disp}, TempMap, Strategy) ->
{FixSrc,NewSrc,DidSpill1} = fix_src1(Src, TempMap, Strategy),
{FixBase,NewBase,DidSpill2} = fix_src2(Base, TempMap, Strategy),
{FixDisp,NewDisp,DidSpill3} = fix_src3_or_imm(Disp, TempMap, Strategy),
NewI = I#store{src=NewSrc,base=NewBase,disp=NewDisp},
{FixSrc ++ FixBase ++ FixDisp ++ [NewI], DidSpill1 or DidSpill2 or DidSpill3}.
do_pseudo_fload(I=#pseudo_fload{base=Base}, TempMap, Strategy) ->
{FixBase,NewBase,DidSpill} = fix_src1(Base, TempMap, Strategy),
NewI = I#pseudo_fload{base=NewBase},
{FixBase ++ [NewI], DidSpill}.
do_pseudo_fstore(I=#pseudo_fstore{base=Base}, TempMap, Strategy) ->
{FixBase,NewBase,DidSpill} = fix_src1(Base, TempMap, Strategy),
NewI = I#pseudo_fstore{base=NewBase},
{FixBase ++ [NewI], DidSpill}.
%%% Fix Dst and Src operands.
fix_funv(FunV, TempMap, Strategy) ->
case FunV of
#sparc_temp{} -> fix_src3(FunV, TempMap, Strategy);
_ -> {[], FunV, false}
end.
fix_src2_or_imm(Src2, TempMap, Strategy) ->
case Src2 of
#sparc_temp{} -> fix_src2(Src2, TempMap, Strategy);
_ -> {[], Src2, false}
end.
fix_src3_or_imm(Src3, TempMap, Strategy) ->
case Src3 of
#sparc_temp{} -> fix_src3(Src3, TempMap, Strategy);
_ -> {[], Src3, false}
end.
fix_src1(Src, TempMap, Strategy) ->
fix_src(Src, TempMap, temp1(Strategy)).
temp1('new') -> [];
temp1('fixed') -> hipe_sparc_registers:temp1().
fix_src2(Src, TempMap, Strategy) ->
fix_src(Src, TempMap, temp2(Strategy)).
temp2('new') -> [];
temp2('fixed') -> hipe_sparc_registers:temp2().
fix_src3(Src, TempMap, Strategy) ->
fix_src(Src, TempMap, temp3(Strategy)).
temp3('new') -> [];
temp3('fixed') -> hipe_sparc_registers:temp3().
fix_src(Src, TempMap, RegOpt) ->
case temp_is_spilled(Src, TempMap) of
true ->
NewSrc = clone(Src, RegOpt),
{[hipe_sparc:mk_pseudo_move(Src, NewSrc)], NewSrc, true};
_ ->
{[], Src, false}
end.
fix_dst(Dst, TempMap, Strategy) ->
case temp_is_spilled(Dst, TempMap) of
true ->
NewDst = clone(Dst, temp1(Strategy)),
{[hipe_sparc:mk_pseudo_move(NewDst, Dst)], NewDst, true};
_ ->
{[], Dst, false}
end.
%%% Check if an operand is a pseudo-temp.
temp_is_spilled(Temp, []) -> % special case for naive regalloc
not(hipe_sparc:temp_is_precoloured(Temp));
temp_is_spilled(Temp, TempMap) ->
case hipe_sparc:temp_is_allocatable(Temp) of
true ->
Reg = hipe_sparc:temp_reg(Temp),
tuple_size(TempMap) > Reg andalso hipe_temp_map:is_spilled(Reg, TempMap);
false -> true
end.
%%% Make a certain reg into a clone of Temp.
clone(Temp, RegOpt) ->
Type = hipe_sparc:temp_type(Temp),
case RegOpt of
[] -> hipe_sparc:mk_new_temp(Type);
Reg -> hipe_sparc:mk_temp(Reg, Type)
end.
