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-rw-r--r--lib/hipe/sparc/hipe_sparc_frame.erl636
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diff --git a/lib/hipe/sparc/hipe_sparc_frame.erl b/lib/hipe/sparc/hipe_sparc_frame.erl
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index 0000000000..f7d7f40df3
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+++ b/lib/hipe/sparc/hipe_sparc_frame.erl
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+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2002-2009. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(hipe_sparc_frame).
+-export([frame/1]).
+
+-include("hipe_sparc.hrl").
+-include("../rtl/hipe_literals.hrl").
+
+frame(Defun) ->
+ Formals = fix_formals(hipe_sparc:defun_formals(Defun)),
+ Temps0 = all_temps(hipe_sparc:defun_code(Defun), Formals),
+ MinFrame = defun_minframe(Defun),
+ Temps = ensure_minframe(MinFrame, Temps0),
+ ClobbersRA = clobbers_ra(hipe_sparc:defun_code(Defun)),
+ CFG0 = hipe_sparc_cfg:init(Defun),
+ Liveness = hipe_sparc_liveness_all:analyse(CFG0),
+ CFG1 = do_body(CFG0, Liveness, Formals, Temps, ClobbersRA),
+ hipe_sparc_cfg:linearise(CFG1).
+
+fix_formals(Formals) ->
+ fix_formals(hipe_sparc_registers:nr_args(), Formals).
+
+fix_formals(0, Rest) -> Rest;
+fix_formals(N, [_|Rest]) -> fix_formals(N-1, Rest);
+fix_formals(_, []) -> [].
+
+do_body(CFG0, Liveness, Formals, Temps, ClobbersRA) ->
+ Context = mk_context(Liveness, Formals, Temps, ClobbersRA),
+ CFG1 = do_blocks(CFG0, Context),
+ do_prologue(CFG1, Context).
+
+do_blocks(CFG, Context) ->
+ Labels = hipe_sparc_cfg:labels(CFG),
+ do_blocks(Labels, CFG, Context).
+
+do_blocks([Label|Labels], CFG, Context) ->
+ Liveness = context_liveness(Context),
+ LiveOut = hipe_sparc_liveness_all:liveout(Liveness, Label),
+ Block = hipe_sparc_cfg:bb(CFG, Label),
+ Code = hipe_bb:code(Block),
+ NewCode = do_block(Code, LiveOut, Context),
+ NewBlock = hipe_bb:code_update(Block, NewCode),
+ NewCFG = hipe_sparc_cfg:bb_add(CFG, Label, NewBlock),
+ do_blocks(Labels, NewCFG, Context);
+do_blocks([], CFG, _) ->
+ CFG.
+
+do_block(Insns, LiveOut, Context) ->
+ do_block(Insns, LiveOut, Context, context_framesize(Context), []).
+
+do_block([I|Insns], LiveOut, Context, FPoff0, RevCode) ->
+ {NewIs, FPoff1} = do_insn(I, LiveOut, Context, FPoff0),
+ do_block(Insns, LiveOut, Context, FPoff1, lists:reverse(NewIs, RevCode));
+do_block([], _, Context, FPoff, RevCode) ->
+ FPoff0 = context_framesize(Context),
+ if FPoff =:= FPoff0 -> [];
+ true -> exit({?MODULE,do_block,FPoff})
+ end,
+ lists:reverse(RevCode, []).
+
+do_insn(I, LiveOut, Context, FPoff) ->
+ case I of
+ #pseudo_call{} ->
+ do_pseudo_call(I, LiveOut, Context, FPoff);
+ #pseudo_call_prepare{} ->
+ do_pseudo_call_prepare(I, FPoff);
+ #pseudo_move{} ->
+ {do_pseudo_move(I, Context, FPoff), FPoff};
+ #pseudo_ret{} ->
+ {do_pseudo_ret(I, Context, FPoff), context_framesize(Context)};
+ #pseudo_tailcall{} ->
+ {do_pseudo_tailcall(I, Context), context_framesize(Context)};
+ #pseudo_fmove{} ->
+ {do_pseudo_fmove(I, Context, FPoff), FPoff};
+ _ ->
+ {[I], FPoff}
+ end.
+
+%%%
+%%% Moves, with Dst or Src possibly a pseudo
+%%%
+
+do_pseudo_move(I, Context, FPoff) ->
+ Dst = hipe_sparc:pseudo_move_dst(I),
+ Src = hipe_sparc:pseudo_move_src(I),
+ case temp_is_pseudo(Dst) of
+ true ->
+ Offset = pseudo_offset(Dst, FPoff, Context),
+ mk_store(Src, hipe_sparc:mk_sp(), Offset, []);
+ _ ->
+ case temp_is_pseudo(Src) of
+ true ->
+ Offset = pseudo_offset(Src, FPoff, Context),
+ mk_load(hipe_sparc:mk_sp(), Offset, Dst, []);
+ _ ->
+ [hipe_sparc:mk_mov(Src, Dst)]
+ end
+ end.
+
+do_pseudo_fmove(I, Context, FPoff) ->
+ Dst = hipe_sparc:pseudo_fmove_dst(I),
+ Src = hipe_sparc:pseudo_fmove_src(I),
+ case temp_is_pseudo(Dst) of
+ true ->
+ Offset = pseudo_offset(Dst, FPoff, Context),
+ mk_fstore(Src, hipe_sparc:mk_sp(), Offset);
+ _ ->
+ case temp_is_pseudo(Src) of
+ true ->
+ Offset = pseudo_offset(Src, FPoff, Context),
+ mk_fload(hipe_sparc:mk_sp(), Offset, Dst);
+ _ ->
+ [hipe_sparc:mk_fp_unary('fmovd', Src, Dst)]
+ end
+ end.
+
+pseudo_offset(Temp, FPoff, Context) ->
+ FPoff + context_offset(Context, Temp).
+
+%%%
+%%% Return - deallocate frame and emit 'ret $N' insn.
+%%%
+
+do_pseudo_ret(I, Context, FPoff) ->
+ %% XXX: typically only one instruction between
+ %% the move-to-RA and the jmp-via-RA, ouch
+ restore_ra(FPoff, Context,
+ adjust_sp(FPoff + word_size() * context_arity(Context),
+ [I])).
+
+restore_ra(FPoff, Context, Rest) ->
+ case context_clobbers_ra(Context) of
+ false -> Rest;
+ true ->
+ RA = hipe_sparc:mk_ra(),
+ mk_load(hipe_sparc:mk_sp(), FPoff - word_size(), RA, Rest)
+ end.
+
+adjust_sp(N, Rest) ->
+ if N =:= 0 ->
+ Rest;
+ true ->
+ SP = hipe_sparc:mk_sp(),
+ hipe_sparc:mk_addi(SP, N, SP, Rest)
+ end.
+
+%%%
+%%% Recursive calls.
+%%%
+
+do_pseudo_call_prepare(I, FPoff0) ->
+ %% Create outgoing arguments area on the stack.
+ NrStkArgs = hipe_sparc:pseudo_call_prepare_nrstkargs(I),
+ Offset = NrStkArgs * word_size(),
+ {adjust_sp(-Offset, []), FPoff0 + Offset}.
+
+do_pseudo_call(I, LiveOut, Context, FPoff0) ->
+ #sparc_sdesc{exnlab=ExnLab,arity=OrigArity} = hipe_sparc:pseudo_call_sdesc(I),
+ FunV = hipe_sparc:pseudo_call_funv(I),
+ LiveTemps = [Temp || Temp <- LiveOut, temp_is_pseudo(Temp)],
+ SDesc = mk_sdesc(ExnLab, Context, LiveTemps),
+ ContLab = hipe_sparc:pseudo_call_contlab(I),
+ Linkage = hipe_sparc:pseudo_call_linkage(I),
+ CallCode = [hipe_sparc:mk_pseudo_call(FunV, SDesc, ContLab, Linkage)],
+ StkArity = erlang:max(0, OrigArity - hipe_sparc_registers:nr_args()),
+ context_need_stack(Context, stack_need(FPoff0, StkArity, FunV)),
+ ArgsBytes = word_size() * StkArity,
+ {CallCode, FPoff0 - ArgsBytes}.
+
+stack_need(FPoff, StkArity, FunV) ->
+ case FunV of
+ #sparc_prim{} -> FPoff;
+ #sparc_mfa{m=M,f=F,a=A} ->
+ case erlang:is_builtin(M, F, A) of
+ true -> FPoff;
+ false -> stack_need_general(FPoff, StkArity)
+ end;
+ _ -> stack_need_general(FPoff, StkArity)
+ end.
+
+stack_need_general(FPoff, StkArity) ->
+ erlang:max(FPoff, FPoff + (?SPARC_LEAF_WORDS - StkArity) * word_size()).
+
+%%%
+%%% Create stack descriptors for call sites.
+%%%
+
+mk_sdesc(ExnLab, Context, Temps) -> % for normal calls
+ Temps0 = only_tagged(Temps),
+ Live = mk_live(Context, Temps0),
+ Arity = context_arity(Context),
+ FSize = context_framesize(Context),
+ hipe_sparc:mk_sdesc(ExnLab, (FSize div word_size())-1, Arity,
+ list_to_tuple(Live)).
+
+only_tagged(Temps)->
+ [X || X <- Temps, hipe_sparc:temp_type(X) =:= 'tagged'].
+
+mk_live(Context, Temps) ->
+ lists:sort([temp_to_slot(Context, Temp) || Temp <- Temps]).
+
+temp_to_slot(Context, Temp) ->
+ (context_framesize(Context) + context_offset(Context, Temp))
+ div word_size().
+
+mk_minimal_sdesc(Context) -> % for inc_stack_0 calls
+ hipe_sparc:mk_sdesc([], 0, context_arity(Context), {}).
+
+%%%
+%%% Tailcalls.
+%%%
+
+do_pseudo_tailcall(I, Context) -> % always at FPoff=context_framesize(Context)
+ Arity = context_arity(Context),
+ Args = hipe_sparc:pseudo_tailcall_stkargs(I),
+ FunV = hipe_sparc:pseudo_tailcall_funv(I),
+ Linkage = hipe_sparc:pseudo_tailcall_linkage(I),
+ {Insns, FPoff1} = do_tailcall_args(Args, Context),
+ context_need_stack(Context, FPoff1),
+ StkArity = length(Args),
+ FPoff2 = FPoff1 + (Arity - StkArity) * word_size(),
+ context_need_stack(Context, stack_need(FPoff2, StkArity, FunV)),
+ I2 =
+ case FunV of
+ #sparc_temp{} ->
+ hipe_sparc:mk_jmp(FunV, hipe_sparc:mk_simm13(0), []);
+ Fun ->
+ hipe_sparc:mk_call_tail(Fun, Linkage)
+ end,
+ %% XXX: break out the RA restore, just like for pseudo_ret?
+ restore_ra(context_framesize(Context), Context,
+ Insns ++ adjust_sp(FPoff2, [I2])).
+
+do_tailcall_args(Args, Context) ->
+ FPoff0 = context_framesize(Context),
+ Arity = context_arity(Context),
+ FrameTop = word_size()*Arity,
+ DangerOff = FrameTop - word_size()*length(Args),
+ %%
+ Moves = mk_moves(Args, FrameTop, []),
+ %%
+ {Stores, Simple, Conflict} =
+ split_moves(Moves, Context, DangerOff, [], [], []),
+ %% sanity check (shouldn't trigger any more)
+ if DangerOff < -FPoff0 ->
+ exit({?MODULE,do_tailcall_args,DangerOff,-FPoff0});
+ true -> []
+ end,
+ FPoff1 = FPoff0,
+ %%
+ {Pushes, Pops, FPoff2} = split_conflict(Conflict, FPoff1, [], []),
+ %%
+ TempReg = hipe_sparc_registers:temp1(),
+ %%
+ {adjust_sp(-(FPoff2 - FPoff1),
+ simple_moves(Pushes, FPoff2, TempReg,
+ store_moves(Stores, FPoff2, TempReg,
+ simple_moves(Simple, FPoff2, TempReg,
+ simple_moves(Pops, FPoff2, TempReg,
+ []))))),
+ FPoff2}.
+
+mk_moves([Arg|Args], Off, Moves) ->
+ Off1 = Off - word_size(),
+ mk_moves(Args, Off1, [{Arg,Off1}|Moves]);
+mk_moves([], _, Moves) ->
+ Moves.
+
+split_moves([Move|Moves], Context, DangerOff, Stores, Simple, Conflict) ->
+ {Src,DstOff} = Move,
+ case src_is_pseudo(Src) of
+ false ->
+ split_moves(Moves, Context, DangerOff, [Move|Stores],
+ Simple, Conflict);
+ true ->
+ SrcOff = context_offset(Context, Src),
+ Type = typeof_temp(Src),
+ if SrcOff =:= DstOff ->
+ split_moves(Moves, Context, DangerOff, Stores,
+ Simple, Conflict);
+ SrcOff >= DangerOff ->
+ split_moves(Moves, Context, DangerOff, Stores,
+ Simple, [{SrcOff,DstOff,Type}|Conflict]);
+ true ->
+ split_moves(Moves, Context, DangerOff, Stores,
+ [{SrcOff,DstOff,Type}|Simple], Conflict)
+ end
+ end;
+split_moves([], _, _, Stores, Simple, Conflict) ->
+ {Stores, Simple, Conflict}.
+
+split_conflict([{SrcOff,DstOff,Type}|Conflict], FPoff, Pushes, Pops) ->
+ FPoff1 = FPoff + word_size(),
+ Push = {SrcOff,-FPoff1,Type},
+ Pop = {-FPoff1,DstOff,Type},
+ split_conflict(Conflict, FPoff1, [Push|Pushes], [Pop|Pops]);
+split_conflict([], FPoff, Pushes, Pops) ->
+ {lists:reverse(Pushes), Pops, FPoff}.
+
+simple_moves([{SrcOff,DstOff,Type}|Moves], FPoff, TempReg, Rest) ->
+ Temp = hipe_sparc:mk_temp(TempReg, Type),
+ SP = hipe_sparc:mk_sp(),
+ LoadOff = FPoff+SrcOff,
+ StoreOff = FPoff+DstOff,
+ simple_moves(Moves, FPoff, TempReg,
+ mk_load(SP, LoadOff, Temp,
+ mk_store(Temp, SP, StoreOff,
+ Rest)));
+simple_moves([], _, _, Rest) ->
+ Rest.
+
+store_moves([{Src,DstOff}|Moves], FPoff, TempReg, Rest) ->
+ %% Type = typeof_temp(Src),
+ SP = hipe_sparc:mk_sp(),
+ StoreOff = FPoff+DstOff,
+ {NewSrc,FixSrc} =
+ case hipe_sparc:is_temp(Src) of
+ true ->
+ {Src, []};
+ _ ->
+ Temp = hipe_sparc:mk_temp(TempReg, 'untagged'),
+ {Temp, hipe_sparc:mk_set(Src, Temp)}
+ end,
+ store_moves(Moves, FPoff, TempReg,
+ FixSrc ++ mk_store(NewSrc, SP, StoreOff, Rest));
+store_moves([], _, _, Rest) ->
+ Rest.
+
+%%%
+%%% Contexts
+%%%
+
+-record(context, {liveness, framesize, arity, map, clobbers_ra, ref_maxstack}).
+
+mk_context(Liveness, Formals, Temps, ClobbersRA) ->
+ {Map, MinOff} = mk_temp_map(Formals, ClobbersRA, Temps),
+ FrameSize = (-MinOff),
+ RefMaxStack = hipe_bifs:ref(FrameSize),
+ #context{liveness=Liveness,
+ framesize=FrameSize, arity=length(Formals),
+ map=Map, clobbers_ra=ClobbersRA, ref_maxstack=RefMaxStack}.
+
+context_need_stack(#context{ref_maxstack=RM}, N) ->
+ M = hipe_bifs:ref_get(RM),
+ if N > M -> hipe_bifs:ref_set(RM, N);
+ true -> []
+ end.
+
+context_maxstack(#context{ref_maxstack=RM}) ->
+ hipe_bifs:ref_get(RM).
+
+context_arity(#context{arity=Arity}) ->
+ Arity.
+
+context_framesize(#context{framesize=FrameSize}) ->
+ FrameSize.
+
+context_liveness(#context{liveness=Liveness}) ->
+ Liveness.
+
+context_offset(#context{map=Map}, Temp) ->
+ tmap_lookup(Map, Temp).
+
+context_clobbers_ra(#context{clobbers_ra=ClobbersRA}) -> ClobbersRA.
+
+mk_temp_map(Formals, ClobbersRA, Temps) ->
+ {Map, 0} = enter_vars(Formals, word_size() * length(Formals),
+ tmap_empty()),
+ TempsList = tset_to_list(Temps),
+ AllTemps =
+ case ClobbersRA of
+ false -> TempsList;
+ true ->
+ RA = hipe_sparc:mk_new_temp('untagged'),
+ [RA|TempsList]
+ end,
+ enter_vars(AllTemps, 0, Map).
+
+enter_vars([V|Vs], PrevOff, Map) ->
+ Off =
+ case hipe_sparc:temp_type(V) of
+ 'double' -> PrevOff - 2*word_size(); % XXX: sparc64: 1*word_size()
+ _ -> PrevOff - word_size()
+ end,
+ enter_vars(Vs, Off, tmap_bind(Map, V, Off));
+enter_vars([], Off, Map) ->
+ {Map, Off}.
+
+tmap_empty() ->
+ gb_trees:empty().
+
+tmap_bind(Map, Key, Val) ->
+ gb_trees:insert(Key, Val, Map).
+
+tmap_lookup(Map, Key) ->
+ gb_trees:get(Key, Map).
+
+%%%
+%%% do_prologue: prepend stack frame allocation code.
+%%%
+%%% NewStart:
+%%% temp1 = *(P + P_SP_LIMIT)
+%%% temp2 = SP - MaxStack
+%%% cmp temp2, temp1
+%%% if (ltu) goto IncStack else goto AllocFrame
+%%% AllocFrame:
+%%% SP = temp2 [if FrameSize == MaxStack]
+%%% SP -= FrameSize [if FrameSize != MaxStack]
+%%% *(SP + FrameSize-WordSize) = RA [if ClobbersRA]
+%%% goto OldStart
+%%% OldStart:
+%%% ...
+%%% IncStack:
+%%% temp1 = RA
+%%% call inc_stack; nop
+%%% RA = temp1
+%%% goto NewStart
+
+do_prologue(CFG, Context) ->
+ MaxStack = context_maxstack(Context),
+ if MaxStack > 0 ->
+ FrameSize = context_framesize(Context),
+ OldStartLab = hipe_sparc_cfg:start_label(CFG),
+ NewStartLab = hipe_gensym:get_next_label(sparc),
+ %%
+ P = hipe_sparc:mk_temp(hipe_sparc_registers:proc_pointer(), 'untagged'),
+ Temp1 = hipe_sparc:mk_temp1(),
+ SP = hipe_sparc:mk_sp(),
+ %%
+ RA = hipe_sparc:mk_ra(),
+ ClobbersRA = context_clobbers_ra(Context),
+ GotoOldStartCode = [hipe_sparc:mk_b_label(OldStartLab)],
+ AllocFrameCodeTail =
+ case ClobbersRA of
+ false -> GotoOldStartCode;
+ true -> mk_store(RA, SP, FrameSize-word_size(), GotoOldStartCode)
+ end,
+ %%
+ Arity = context_arity(Context),
+ Guaranteed = erlang:max(0, (?SPARC_LEAF_WORDS - Arity) * word_size()),
+ %%
+ {CFG1,NewStartCode} =
+ if MaxStack =< Guaranteed ->
+ %% io:format("~w: MaxStack ~w =< Guaranteed ~w :-)\n", [?MODULE,MaxStack,Guaranteed]),
+ AllocFrameCode = adjust_sp(-FrameSize, AllocFrameCodeTail),
+ NewStartCode0 = AllocFrameCode, % no mflr needed
+ {CFG,NewStartCode0};
+ true ->
+ %% io:format("~w: MaxStack ~w > Guaranteed ~w :-(\n", [?MODULE,MaxStack,Guaranteed]),
+ AllocFrameLab = hipe_gensym:get_next_label(sparc),
+ IncStackLab = hipe_gensym:get_next_label(sparc),
+ Temp2 = hipe_sparc:mk_temp2(),
+ %%
+ NewStartCodeTail2 =
+ [hipe_sparc:mk_pseudo_bp('lu', IncStackLab, AllocFrameLab, 0.01)],
+ NewStartCodeTail1 = NewStartCodeTail2, % no mflr needed
+ NewStartCode0 =
+ mk_load(P, ?P_NSP_LIMIT, Temp1,
+ hipe_sparc:mk_addi(SP, -MaxStack, Temp2,
+ [hipe_sparc:mk_alu('subcc', Temp2, Temp1, hipe_sparc:mk_g0()) |
+ NewStartCodeTail1])),
+ %%
+ AllocFrameCode =
+ if MaxStack =:= FrameSize ->
+ %% io:format("~w: MaxStack =:= FrameSize =:= ~w :-)\n", [?MODULE,MaxStack]),
+ [hipe_sparc:mk_mov(Temp2, SP) |
+ AllocFrameCodeTail];
+ true ->
+ %% io:format("~w: MaxStack ~w =/= FrameSize ~w :-(\n", [?MODULE,MaxStack,FrameSize]),
+ adjust_sp(-FrameSize, AllocFrameCodeTail)
+ end,
+ %%
+ IncStackCodeTail =
+ [hipe_sparc:mk_call_rec(hipe_sparc:mk_prim('inc_stack_0'),
+ mk_minimal_sdesc(Context), not_remote),
+ hipe_sparc:mk_mov(Temp1, RA),
+ hipe_sparc:mk_b_label(NewStartLab)],
+ IncStackCode =
+ [hipe_sparc:mk_mov(RA, Temp1) | IncStackCodeTail], % mflr always needed
+ %%
+ CFG0a = hipe_sparc_cfg:bb_add(CFG, AllocFrameLab,
+ hipe_bb:mk_bb(AllocFrameCode)),
+ CFG0b = hipe_sparc_cfg:bb_add(CFG0a, IncStackLab,
+ hipe_bb:mk_bb(IncStackCode)),
+ %%
+ {CFG0b,NewStartCode0}
+ end,
+ %%
+ CFG2 = hipe_sparc_cfg:bb_add(CFG1, NewStartLab,
+ hipe_bb:mk_bb(NewStartCode)),
+ hipe_sparc_cfg:start_label_update(CFG2, NewStartLab);
+ true ->
+ CFG
+ end.
+
+%%% Create a load instruction.
+%%% May clobber Dst early for large offsets. In principle we could
+%%% clobber TEMP2 if Dst =:= Base, but Dst =/= Base here in frame.
+
+mk_load(Base, Offset, Dst, Rest) ->
+ LdOp = 'lduw', % XXX: sparc64: ldx
+ hipe_sparc:mk_load(LdOp, Base, Offset, Dst, 'error', Rest).
+
+mk_fload(Base, Offset, Dst) ->
+ hipe_sparc:mk_fload(Base, Offset, Dst, 'temp2').
+
+%%% Create a store instruction.
+%%% May clobber TEMP2 for large offsets.
+
+mk_store(Src, Base, Offset, Rest) ->
+ StOp = 'stw', % XXX: sparc64: stx
+ hipe_sparc:mk_store(StOp, Src, Base, Offset, 'temp2', Rest).
+
+mk_fstore(Src, Base, Offset) ->
+ hipe_sparc:mk_fstore(Src, Base, Offset, 'temp2').
+
+%%% typeof_temp -- what's temp's type?
+
+typeof_temp(Temp) ->
+ hipe_sparc:temp_type(Temp).
+
+%%% Check if an operand is a pseudo-Temp.
+
+src_is_pseudo(Src) ->
+ hipe_sparc:is_temp(Src) andalso temp_is_pseudo(Src).
+
+temp_is_pseudo(Temp) ->
+ not(hipe_sparc:temp_is_precoloured(Temp)).
+
+%%%
+%%% Detect if a Defun's body clobbers RA.
+%%%
+
+clobbers_ra(Insns) ->
+ case Insns of
+ [#pseudo_call{}|_] -> true;
+ %% moves to RA cannot occur yet
+ [_|Rest] -> clobbers_ra(Rest);
+ [] -> false
+ end.
+
+%%%
+%%% Build the set of all temps used in a Defun's body.
+%%%
+
+all_temps(Code, Formals) ->
+ S0 = find_temps(Code, tset_empty()),
+ S1 = tset_del_list(S0, Formals),
+ tset_filter(S1, fun(T) -> temp_is_pseudo(T) end).
+
+find_temps([I|Insns], S0) ->
+ S1 = tset_add_list(S0, hipe_sparc_defuse:insn_def_all(I)),
+ S2 = tset_add_list(S1, hipe_sparc_defuse:insn_use_all(I)),
+ find_temps(Insns, S2);
+find_temps([], S) ->
+ S.
+
+tset_empty() ->
+ gb_sets:new().
+
+tset_size(S) ->
+ gb_sets:size(S).
+
+tset_insert(S, T) ->
+ gb_sets:add_element(T, S).
+
+tset_add_list(S, Ts) ->
+ gb_sets:union(S, gb_sets:from_list(Ts)).
+
+tset_del_list(S, Ts) ->
+ gb_sets:subtract(S, gb_sets:from_list(Ts)).
+
+tset_filter(S, F) ->
+ gb_sets:filter(F, S).
+
+tset_to_list(S) ->
+ gb_sets:to_list(S).
+
+%%%
+%%% Compute minimum permissible frame size, ignoring spilled temps.
+%%% This is done to ensure that we won't have to adjust the frame size
+%%% in the middle of a tailcall.
+%%%
+
+defun_minframe(Defun) ->
+ MaxTailArity = body_mta(hipe_sparc:defun_code(Defun), 0),
+ MyArity = length(fix_formals(hipe_sparc:defun_formals(Defun))),
+ erlang:max(MaxTailArity - MyArity, 0).
+
+body_mta([I|Code], MTA) ->
+ body_mta(Code, insn_mta(I, MTA));
+body_mta([], MTA) ->
+ MTA.
+
+insn_mta(I, MTA) ->
+ case I of
+ #pseudo_tailcall{arity=Arity} ->
+ erlang:max(MTA, Arity - hipe_sparc_registers:nr_args());
+ _ -> MTA
+ end.
+
+%%%
+%%% Ensure that we have enough temps to satisfy the minimum frame size,
+%%% if necessary by prepending unused dummy temps.
+%%%
+
+ensure_minframe(MinFrame, Temps) ->
+ ensure_minframe(MinFrame, tset_size(Temps), Temps).
+
+ensure_minframe(MinFrame, Frame, Temps) ->
+ if MinFrame > Frame ->
+ Temp = hipe_sparc:mk_new_temp('untagged'),
+ ensure_minframe(MinFrame, Frame+1, tset_insert(Temps, Temp));
+ true -> Temps
+ end.
+
+word_size() ->
+ hipe_rtl_arch:word_size().
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-02 11:11:22 +0000