aboutsummaryrefslogblamecommitdiffstats
path: root/lib/hipe/rtl/hipe_icode2rtl.erl
blob: 82970f04ab7ec862aa09e7e5a6ce4c07ca1b3291 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421

                                 










                                                                           





                                                                         

















































































































































































































































































































































































































                                                                                









                                                                          

                                                                      





























































































































































































































































































                                                                              
%% -*- 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.
%%
%%=======================================================================
%% File        : hipe_icode2rtl.erl
%% Author(s)   : Erik Johansson
%% Description : Translates Icode to RTL
%%=======================================================================
%% TODO: Better handling of switches...

-module(hipe_icode2rtl).

-export([translate/2]).
-export([translate_instrs/4]).  %% used in hipe_rtl_mk_switch

%%-------------------------------------------------------------------------

%% -define(DEBUG,1).	% used by hipe.hrl below

-include("../main/hipe.hrl").
-include("../icode/hipe_icode.hrl").
-include("hipe_literals.hrl").

%%-------------------------------------------------------------------------

%% @spec translate(IcodeRecord::#icode{}, Options::options()) -> term()
%%
%%     options() = [option()]
%%     option() = term()
%%
%% @doc Translates a linear form of Icode for a single function to a
%% linear form of RTL-code.
%%
translate(IcodeRecord = #icode{}, Options) ->
  ?IF_DEBUG_LEVEL(2, put(hipe_mfa, hipe_icode:icode_fun(IcodeRecord)), ok),
  %% hipe_icode_pp:pp(Fun),

  %% Initialize gensym and varmap
  {Args, VarMap} = hipe_rtl_varmap:init(IcodeRecord),
  %% Get the name and other info of the function to translate.
  MFA = hipe_icode:icode_fun(IcodeRecord),
  ConstTab = hipe_consttab:new(), % hipe_icode:icode_data(IcodeRecord),
  %% io:format("~w\n", [ConstTab]),
  Icode = hipe_icode:icode_code(IcodeRecord),
  IsClosure = hipe_icode:icode_is_closure(IcodeRecord), 
  IsLeaf = hipe_icode:icode_is_leaf(IcodeRecord),
  IcodeInfo = hipe_icode:icode_info(IcodeRecord),

  %% Translate Icode instructions to RTL instructions
  ?opt_start_timer("Icode to nested RTL"),
  {Code, _VarMap1, ConstTab1} = 
    translate_instrs(Icode, VarMap, ConstTab, Options),
  ?opt_stop_timer("Icode to nested RTL"),
  %% We build the code as list of lists of...
  %%  in order to avoid appends.
  ?opt_start_timer("Flatten RTL"),
  Code1 = lists:flatten(Code), 
  ?opt_stop_timer("Flatten RTL"),
  %% Build the RTL structure.
  Rtl = hipe_rtl:mk_rtl(MFA,
			Args,
			IsClosure,
			IsLeaf,
			Code1,
			ConstTab1,
			{1, hipe_gensym:get_var(rtl)},
			{1, hipe_gensym:get_label(rtl)}),
  %% hipe_rtl:pp(Rtl),
  %% Propagate info from Icode to RTL.
  hipe_rtl:rtl_info_update(Rtl, IcodeInfo).

%%-------------------------------------------------------------------------
 
%%
%% @doc Translates a list of Icode instructions to a list of RTL instructions.
%%
translate_instrs(Is, VarMap, ConstTab, Options) ->
  translate_instrs(Is, VarMap, [], ConstTab, Options).

translate_instrs([], VarMap, RTL_Code, ConstTab, _Options) ->
  {RTL_Code, VarMap, ConstTab};
translate_instrs([I|Is], VarMap, AccCode, ConstTab, Options) ->
  %% Translate one instruction. 
  {Code, VarMap0, ConstTab0} = 
    translate_instruction(I, VarMap, ConstTab, Options),
  %% ?IF_DEBUG_LEVEL(3,?msg("  To Instr: ~w~n",[Code]),no_debug),
  ?IF_DEBUG(?when_option(rtl_show_translation, Options,
			 ?msg("  To Instr: ~w~n", [Code])), ok),
  translate_instrs(Is, VarMap0, [AccCode,Code], ConstTab0, Options).

%%
%% @doc Translates an Icode instruction to one or more RTL instructions.
%%

translate_instruction(I, VarMap, ConstTab, Options) ->
  %% ?IF_DEBUG_LEVEL(3,?msg("From Instr: ~w~n",[I]),no_debug),
  ?IF_DEBUG(?when_option(rtl_show_translation, Options,
			 ?msg("From Instr: ~w~n", [I])), ok),
  case I of
    #icode_call{} ->  
      gen_call(I, VarMap, ConstTab);
    #icode_comment{} ->
      {hipe_rtl:mk_comment(hipe_icode:comment_text(I)), VarMap, ConstTab};  
    #icode_enter{} -> 
      gen_enter(I, VarMap, ConstTab);
    #icode_fail{} ->
      gen_fail(I, VarMap, ConstTab);
    #icode_goto{} -> 
      gen_goto(I, VarMap, ConstTab);
    #icode_if{} ->  
      gen_if(I, VarMap, ConstTab);
    #icode_label{} ->
      gen_label(I, VarMap, ConstTab);
    #icode_move{} ->  
      gen_move(I, VarMap, ConstTab);
    #icode_begin_handler{} ->
      hipe_rtl_exceptions:gen_begin_handler(I, VarMap, ConstTab);
    #icode_return{} -> 
      gen_return(I, VarMap, ConstTab);
    #icode_switch_val{} -> 
      gen_switch_val(I, VarMap, ConstTab, Options);
    #icode_switch_tuple_arity{} -> 
      gen_switch_tuple(I, VarMap, ConstTab, Options);
    #icode_type{} -> 
      gen_type(I, VarMap, ConstTab);
    X ->
      exit({?MODULE,{"unknown Icode instruction",X}})
  end.

%%-------------------------------------------------------------------------

%%
%% CALL
%%

gen_call(I, VarMap, ConstTab) ->
  Fun = hipe_icode:call_fun(I),
  {Dst, VarMap0} = hipe_rtl_varmap:ivs2rvs(hipe_icode:call_dstlist(I), VarMap),
  Fail = hipe_icode:call_fail_label(I),
  
  {Args, VarMap1, ConstTab1, InitCode} = 
    args_to_vars(hipe_icode:call_args(I), VarMap0, ConstTab),
  
  IsGuard = hipe_icode:call_in_guard(I),
   
  {FailLblName, VarMap3} =
    case Fail of 
      [] -> %% Not in a catch
	{[], VarMap1};
      _ ->
	{FLbl, VarMap2} = 
	  hipe_rtl_varmap:icode_label2rtl_label(Fail, VarMap1),
	{hipe_rtl:label_name(FLbl), VarMap2}
    end,
  
  {ContLblName, ContLbl, VarMap4} =
    case hipe_icode:call_continuation(I) of
      [] -> %% This call does not end a BB.
	CLbl = hipe_rtl:mk_new_label(),
	{hipe_rtl:label_name(CLbl), CLbl, VarMap3};
      Cont ->
	{CLbl, NewVarMap} =
	  hipe_rtl_varmap:icode_label2rtl_label(Cont, VarMap3),
	{hipe_rtl:label_name(CLbl), [], NewVarMap}
    end,
	
  {Code, ConstTab2} =
    case hipe_icode:call_type(I) of 
      primop ->
	hipe_rtl_primops:gen_primop(
	  {Fun, Dst, Args, ContLblName, FailLblName},
	  IsGuard, ConstTab1);
      Type ->
	Call = gen_call_1(Fun, Dst, Args, IsGuard, ContLblName,
			  FailLblName, Type),
	{Call, ConstTab1}
    end,
  {[InitCode,Code,ContLbl], VarMap4, ConstTab2}.

%% This catches those standard functions that we inline expand

gen_call_1(Fun={_M,_F,_A}, Dst, Args, IsGuard, Cont, Fail, Type) ->
  case hipe_rtl_primops:gen_call_builtin(Fun, Dst, Args, IsGuard, Cont,
					 Fail) of
    [] ->
      hipe_rtl:mk_call(Dst, Fun, Args, Cont, Fail, conv_call_type(Type));
    Code ->
      Code
  end.

conv_call_type(remote) -> remote;
conv_call_type(local) -> not_remote.

%% --------------------------------------------------------------------

%%
%% ENTER
%%

gen_enter(I, VarMap, ConstTab) ->
  Fun = hipe_icode:enter_fun(I),
  {Args, VarMap1, ConstTab1, InitCode} = 
    args_to_vars(hipe_icode:enter_args(I), VarMap, ConstTab),
  {Code1, ConstTab2} =
    case hipe_icode:enter_type(I) of
      primop ->
	IsGuard = false, % enter can not happen in a guard
	hipe_rtl_primops:gen_enter_primop({Fun, Args}, IsGuard, ConstTab1);
      Type ->
	Call = gen_enter_1(Fun, Args, Type),
	{Call, ConstTab1}
    end,
  {[InitCode,Code1], VarMap1, ConstTab2}.

%% This catches those standard functions that we inline expand

gen_enter_1(Fun, Args, Type) ->
  case hipe_rtl_primops:gen_enter_builtin(Fun, Args) of
    [] ->
      hipe_rtl:mk_enter(Fun, Args, conv_call_type(Type));
    Code ->
      Code
  end.

%% --------------------------------------------------------------------

%%
%% FAIL
%%

gen_fail(I, VarMap, ConstTab) ->
  Fail = hipe_icode:fail_label(I),
  {Label, VarMap0} =
    if Fail =:= [] ->
	%% not in a catch
	{[], VarMap};
       true ->
	{Lbl, Map} = hipe_rtl_varmap:icode_label2rtl_label(Fail, VarMap),
	{hipe_rtl:label_name(Lbl), Map}
    end,
  {Args, VarMap1, ConstTab1, InitCode} = 
    args_to_vars(hipe_icode:fail_args(I), VarMap0, ConstTab),
  Class = hipe_icode:fail_class(I),
  FailCode = hipe_rtl_exceptions:gen_fail(Class, Args, Label),
  {[InitCode, FailCode], VarMap1, ConstTab1}.

%% --------------------------------------------------------------------

%%
%% GOTO
%%

gen_goto(I, VarMap, ConstTab) ->
  {Label, Map0} = 
    hipe_rtl_varmap:icode_label2rtl_label(hipe_icode:goto_label(I), VarMap),
  {hipe_rtl:mk_goto(hipe_rtl:label_name(Label)), Map0, ConstTab}.

%% --------------------------------------------------------------------

%%
%% IF
%%

gen_if(I, VarMap, ConstTab) ->
  {Args, VarMap1, ConstTab1, InitCode} = 
    args_to_vars(hipe_icode:if_args(I), VarMap, ConstTab),
  {TrueLbl, VarMap2} = 
    hipe_rtl_varmap:icode_label2rtl_label(hipe_icode:if_true_label(I), VarMap1),
  {FalseLbl, VarMap3} = 
    hipe_rtl_varmap:icode_label2rtl_label(hipe_icode:if_false_label(I),VarMap2),
  CondCode = 
    gen_cond(hipe_icode:if_op(I),
	     Args,
	     hipe_rtl:label_name(TrueLbl),
	     hipe_rtl:label_name(FalseLbl),
	     hipe_icode:if_pred(I)),
  {[InitCode,CondCode], VarMap3, ConstTab1}.


%% --------------------------------------------------------------------

%%
%% LABEL
%%

gen_label(I, VarMap, ConstTab) ->
  LabelName = hipe_icode:label_name(I),
  {NewLabel,Map0} = hipe_rtl_varmap:icode_label2rtl_label(LabelName, VarMap),
  {NewLabel,Map0,ConstTab}.

%% --------------------------------------------------------------------

%%
%% MOVE
%%

gen_move(I, VarMap, ConstTab) ->
  MovedSrc = hipe_icode:move_src(I),
  {Dst, VarMap0} =
    hipe_rtl_varmap:icode_var2rtl_var(hipe_icode:move_dst(I), VarMap),
  case hipe_icode:is_const(MovedSrc) of
    true ->
      {Code, NewConstMap} = gen_const_move(Dst, MovedSrc, ConstTab),
      {[Code], VarMap0, NewConstMap};
    false ->
      {Src, VarMap1} = hipe_rtl_varmap:icode_var2rtl_var(MovedSrc, VarMap0),
      Code = 
	case  hipe_icode:is_fvar(MovedSrc) of
	  true ->
	    hipe_rtl:mk_fmove(Dst, Src);
	  false -> % It is a var or reg
	    hipe_rtl:mk_move(Dst, Src)
	end,
      {[Code], VarMap1, ConstTab}
  end.

%% --------------------------------------------------------------------

%%
%% RETURN
%%

gen_return(I, VarMap, ConstTab) ->
  {RetVars, VarMap0, ConstTab0, Code} = 
    args_to_vars(hipe_icode:return_vars(I), VarMap, ConstTab),
  {Code ++ [hipe_rtl:mk_return(RetVars)], VarMap0, ConstTab0}.

%% --------------------------------------------------------------------

%%
%% SWITCH
%%

%%
%% Rewrite switch_val to the equivalent Icode if-then-else sequence,
%% then translate that sequence instead.
%% Doing this at the RTL level would generate the exact same code,
%% but would also require _a_lot_ more work.
%% (Don't believe me? Try it. I did, and threw the code away in disgust.
%% The main ugliness comes from (1) maintaining ConstTab for the constants
%% that may be added there [switch_val is not limited to immediates!],
%% (2) maintaining Map for the translated labels, and (3) expanding
%% equality tests to eq-or-call-primop-exact_eqeq_2.)
%%
%% TODO:
%% - separate immediate and non-immediate cases,
%%   and translate each list separately
%%
-ifdef(usesjumptable).
-define(uumess,?msg("~w Use jtab: ~w\n",
		    [Options,proplists:get_bool(use_jumptable, Options)])).
-else.
-define(uumess,ok).
-endif.

gen_switch_val(I, VarMap, ConstTab, Options) ->
  %% If you want to see whether jumptables are used or not...
  ?uumess,
  hipe_rtl_mk_switch:gen_switch_val(I, VarMap, ConstTab, Options).

gen_switch_tuple(I, Map, ConstTab, Options) ->
  hipe_rtl_mk_switch:gen_switch_tuple(I, Map, ConstTab, Options).

%% --------------------------------------------------------------------

%%
%% TYPE
%%

gen_type(I, VarMap, ConstTab) ->
  {Vars, Map0, NewConstTab, Code1} = 
    args_to_vars(hipe_icode:type_args(I), VarMap, ConstTab),
  {TrueLbl, Map1} =
    hipe_rtl_varmap:icode_label2rtl_label(hipe_icode:type_true_label(I), Map0),
  {FalseLbl, Map2} =
    hipe_rtl_varmap:icode_label2rtl_label(hipe_icode:type_false_label(I), Map1),
  {Code2, NewConstTab1} = gen_type_test(Vars, hipe_icode:type_test(I), 
					hipe_rtl:label_name(TrueLbl),
					hipe_rtl:label_name(FalseLbl),
					hipe_icode:type_pred(I),
					NewConstTab),
  {Code1 ++ Code2, Map2, NewConstTab1}.

%% --------------------------------------------------------------------

%%
%% Generate code for a type test. If X is not of type Type then goto Label.
%%

gen_type_test([X], Type, TrueLbl, FalseLbl, Pred, ConstTab) ->
  case Type of
    atom ->
      {hipe_tagscheme:test_atom(X, TrueLbl, FalseLbl, Pred), ConstTab};
    bignum ->
      {hipe_tagscheme:test_bignum(X, TrueLbl, FalseLbl, Pred), ConstTab};
    binary ->
      {hipe_tagscheme:test_binary(X, TrueLbl, FalseLbl, Pred), ConstTab};
    bitstr ->
      {hipe_tagscheme:test_bitstr(X, TrueLbl, FalseLbl, Pred), ConstTab};
    boolean ->
      TmpT = hipe_rtl:mk_new_var(),
      TmpF = hipe_rtl:mk_new_var(),
      Lbl = hipe_rtl:mk_new_label(),
      {[hipe_rtl:mk_load_atom(TmpT, true),
	hipe_rtl:mk_branch(X, eq, TmpT, TrueLbl,hipe_rtl:label_name(Lbl),Pred),
        Lbl,
        hipe_rtl:mk_load_atom(TmpF, false),
        hipe_rtl:mk_branch(X, eq, TmpF, TrueLbl, FalseLbl, Pred)], ConstTab};
    cons ->
      {hipe_tagscheme:test_cons(X, TrueLbl, FalseLbl, Pred), ConstTab};
    fixnum ->
      {hipe_tagscheme:test_fixnum(X, TrueLbl, FalseLbl, Pred), ConstTab};
    float ->
      {hipe_tagscheme:test_flonum(X, TrueLbl, FalseLbl, Pred), ConstTab};
    function ->
      {hipe_tagscheme:test_fun(X, TrueLbl, FalseLbl, Pred), ConstTab};
    integer ->
      {hipe_tagscheme:test_integer(X, TrueLbl, FalseLbl, Pred), ConstTab};
    list ->
      {hipe_tagscheme:test_list(X, TrueLbl, FalseLbl, Pred), ConstTab};
    map ->
      {hipe_tagscheme:test_map(X, TrueLbl, FalseLbl, Pred), ConstTab};
    nil ->
      {hipe_tagscheme:test_nil(X, TrueLbl, FalseLbl, Pred), ConstTab};
    number ->
      {hipe_tagscheme:test_number(X, TrueLbl, FalseLbl, Pred), ConstTab};
    pid ->
      {hipe_tagscheme:test_any_pid(X, TrueLbl, FalseLbl, Pred), ConstTab};
    port ->
      {hipe_tagscheme:test_any_port(X, TrueLbl, FalseLbl, Pred), ConstTab};
    reference ->
      {hipe_tagscheme:test_ref(X, TrueLbl, FalseLbl, Pred), ConstTab};
    tuple ->
      {hipe_tagscheme:test_tuple(X, TrueLbl, FalseLbl, Pred), ConstTab};
    {atom, Atom} ->
      Tmp = hipe_rtl:mk_new_var(),
      {[hipe_rtl:mk_load_atom(Tmp, Atom),
	hipe_rtl:mk_branch(X, eq, Tmp, TrueLbl, FalseLbl, Pred)], ConstTab};
    {integer, N} when is_integer(N) -> 
      %% XXX: warning, does not work for bignums
      case hipe_tagscheme:is_fixnum(N) of
	true ->
	  Int = hipe_tagscheme:mk_fixnum(N),
	  {hipe_rtl:mk_branch(X, eq, hipe_rtl:mk_imm(Int),
			      TrueLbl, FalseLbl, Pred),
	   ConstTab};
	false ->
	  BignumLbl = hipe_rtl:mk_new_label(),
	  RetLbl = hipe_rtl:mk_new_label(),
	  BigN = hipe_rtl:mk_new_var(),
	  Tmp = hipe_rtl:mk_new_var(),
	  {BigCode,NewConstTab} = gen_big_move(BigN, N, ConstTab),
	  {[hipe_tagscheme:test_fixnum(X, FalseLbl,
				       hipe_rtl:label_name(BignumLbl),1-Pred),
	    BignumLbl, BigCode]
	   ++
	   [hipe_rtl:mk_call([Tmp], op_exact_eqeq_2 , [X,BigN],
			     hipe_rtl:label_name(RetLbl),[],not_remote),
	    RetLbl,
	    hipe_rtl:mk_branch(Tmp, ne, hipe_rtl:mk_imm(0),
			       TrueLbl, FalseLbl, Pred)],
	   NewConstTab}
      end;
    {record, A, S} ->
      TupleLbl = hipe_rtl:mk_new_label(),
      TupleLblName = hipe_rtl:label_name(TupleLbl),
      AtomLab = hipe_rtl:mk_new_label(),
      AtomLabName = hipe_rtl:label_name(AtomLab),
      TagVar = hipe_rtl:mk_new_var(),
      TmpAtomVar = hipe_rtl:mk_new_var(),
      {UntagCode, ConstTab1} =
	hipe_rtl_primops:gen_primop({{unsafe_element,1},[TagVar],[X],
				     AtomLabName,[]},
				    false, ConstTab),
      Code = 
	hipe_tagscheme:test_tuple_N(X, S, TupleLblName, FalseLbl, Pred) ++
	[TupleLbl|UntagCode] ++
	[AtomLab,
	 hipe_rtl:mk_load_atom(TmpAtomVar, A),
	 hipe_rtl:mk_branch(TagVar, eq, TmpAtomVar, TrueLbl, FalseLbl, Pred)],
      {Code,
       ConstTab1};
    {tuple, N} ->
      {hipe_tagscheme:test_tuple_N(X, N, TrueLbl, FalseLbl, Pred), ConstTab};
    Other ->
      exit({?MODULE,{"unknown type",Other}})
  end;
gen_type_test(Z = [X,Y], Type, TrueLbl, FalseLbl, Pred, ConstTab) ->
  case Type of
    function2 ->
      {hipe_tagscheme:test_fun2(X, Y, TrueLbl, FalseLbl, Pred), ConstTab};
    fixnum ->
      {hipe_tagscheme:test_fixnums(Z, TrueLbl, FalseLbl, Pred), ConstTab};
    Other ->
      exit({?MODULE,{"unknown type",Other}})
  end;
gen_type_test(X, Type, TrueLbl, FalseLbl, Pred, ConstTab) ->
  case Type of
    fixnum -> 
      {hipe_tagscheme:test_fixnums(X, TrueLbl, FalseLbl, Pred), ConstTab};
    Other ->
      exit({?MODULE,{"type cannot have several arguments",Other}})
  end.


%% --------------------------------------------------------------------
%%
%% Generate code for the if-conditional.
%%

gen_cond(CondOp, Args, TrueLbl, FalseLbl, Pred) ->
  Tmp = hipe_rtl:mk_new_reg_gcsafe(),
  GenLbl = hipe_rtl:mk_new_label(),
  TestRetLbl = hipe_rtl:mk_new_label(),
  TestRetName = hipe_rtl:label_name(TestRetLbl),

  case CondOp of
    'fixnum_eq' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2, TrueLbl,
			  FalseLbl, Pred)];
    '=:=' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2, TrueLbl,
			  hipe_rtl:label_name(GenLbl), Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], op_exact_eqeq_2, Args,
			TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, ne, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    'fixnum_neq' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2, FalseLbl,
			  TrueLbl, 1-Pred)];
    '=/=' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2, FalseLbl,
			  hipe_rtl:label_name(GenLbl), 1-Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], op_exact_eqeq_2, Args,
			TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, ne, hipe_rtl:mk_imm(0),
			  FalseLbl, TrueLbl, Pred)];
    '==' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2,
			  TrueLbl, hipe_rtl:label_name(GenLbl), Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, eq, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    '/=' ->
      [Arg1, Arg2] = Args,
      [hipe_rtl:mk_branch(Arg1, eq, Arg2,
			  FalseLbl, hipe_rtl:label_name(GenLbl), 1-Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, ne, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    'fixnum_gt' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:fixnum_gt(Arg1, Arg2, TrueLbl, FalseLbl, Pred)];
    'fixnum_ge' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:fixnum_ge(Arg1, Arg2, TrueLbl, FalseLbl, Pred)];
    'fixnum_lt' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:fixnum_lt(Arg1, Arg2, TrueLbl, FalseLbl, Pred)];
    'fixnum_le' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:fixnum_le(Arg1, Arg2, TrueLbl, FalseLbl, Pred)];
    '>' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:test_two_fixnums(Arg1, Arg2,
				       hipe_rtl:label_name(GenLbl)),
       hipe_tagscheme:fixnum_gt(Arg1, Arg2, TrueLbl, FalseLbl, Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, gt, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    '<' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:test_two_fixnums(Arg1, Arg2,
				       hipe_rtl:label_name(GenLbl)),
       hipe_tagscheme:fixnum_lt(Arg1, Arg2, TrueLbl, FalseLbl, Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, lt, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    '>=' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:test_two_fixnums(Arg1, Arg2,
				       hipe_rtl:label_name(GenLbl)),
       hipe_tagscheme:fixnum_ge(Arg1, Arg2, TrueLbl, FalseLbl, Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, ge, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    '=<' ->
      [Arg1, Arg2] = Args,
      [hipe_tagscheme:test_two_fixnums(Arg1, Arg2,
				       hipe_rtl:label_name(GenLbl)),
       hipe_tagscheme:fixnum_le(Arg1, Arg2, TrueLbl, FalseLbl, Pred),
       GenLbl,
       hipe_rtl:mk_call([Tmp], cmp_2, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, le, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)];
    _Other ->
      [hipe_rtl:mk_call([Tmp], CondOp, Args, TestRetName, [], not_remote),
       TestRetLbl,
       hipe_rtl:mk_branch(Tmp, ne, hipe_rtl:mk_imm(0),
			  TrueLbl, FalseLbl, Pred)]
  end.

%% --------------------------------------------------------------------
%%
%% Translate a list argument list of icode vars to rtl vars. Also
%% handles constants in arguments.
%% 

args_to_vars([Arg|Args],VarMap, ConstTab) ->
  {Vars, VarMap1, ConstTab1, Code} = 
    args_to_vars(Args, VarMap, ConstTab),
  case hipe_icode:is_variable(Arg) of
    true ->
      {Var, VarMap2} = hipe_rtl_varmap:icode_var2rtl_var(Arg, VarMap1),
      {[Var|Vars], VarMap2, ConstTab1, Code};
    false ->
      case type_of_const(Arg) of
	big ->
	  ConstVal = hipe_icode:const_value(Arg),
	  {ConstTab2, Label} = hipe_consttab:insert_term(ConstTab1, ConstVal),
	  NewArg = hipe_rtl:mk_const_label(Label),
	  {[NewArg|Vars], VarMap1, ConstTab2, Code};
	fixnum ->
	  ConstVal = hipe_icode:const_value(Arg),
	  NewArg = hipe_rtl:mk_imm(tagged_val_of(ConstVal)),
	  {[NewArg|Vars], VarMap1, ConstTab1, Code};
	nil ->
	  NewArg = hipe_rtl:mk_imm(tagged_val_of([])),
	  {[NewArg|Vars], VarMap1, ConstTab1, Code};
	_ ->
	  Var = hipe_rtl:mk_new_var(),
	  {Code2, ConstTab2} = gen_const_move(Var, Arg, ConstTab1),
	  {[Var|Vars], VarMap1, ConstTab2, [Code2,Code]}
      end
  end;
args_to_vars([], VarMap, ConstTab) ->
  {[], VarMap, ConstTab, []}.

%% --------------------------------------------------------------------

%%
%% Translate a move where the source is a constant
%%

gen_const_move(Dst, Const, ConstTab) ->
  ConstVal = hipe_icode:const_value(Const),
  case type_of_const(Const) of
    %% const_fun -> 
    %%   gen_fun_move(Dst, ConstVal, ConstTab);
    nil ->
      Src = hipe_rtl:mk_imm(tagged_val_of([])),
      {hipe_rtl:mk_move(Dst, Src), ConstTab};
    fixnum ->
      Src = hipe_rtl:mk_imm(tagged_val_of(ConstVal)),
      {hipe_rtl:mk_move(Dst, Src), ConstTab};
    atom ->
      {hipe_rtl:mk_load_atom(Dst, ConstVal), ConstTab};
    big ->
      gen_big_move(Dst, ConstVal, ConstTab)
  end.

%% gen_fun_move(Dst, Fun, ConstTab) ->
%%   ?WARNING_MSG("Funmove ~w! -- NYI\n", [Fun]),
%%   {NewTab, Label} = hipe_consttab:insert_fun(ConstTab, Fun),
%%   {hipe_rtl:mk_load_address(Dst, Label, constant), NewTab}.

gen_big_move(Dst, Big, ConstTab) ->
  {NewTab, Label} = hipe_consttab:insert_term(ConstTab, Big),
  {hipe_rtl:mk_move(Dst, hipe_rtl:mk_const_label(Label)),
   NewTab}.

type_of_const(Const) ->
  case hipe_icode:const_value(Const) of
    [] -> 
      nil;
    X when is_integer(X) ->
      case hipe_tagscheme:is_fixnum(X) of
	true -> fixnum;
	false -> big
      end;
    A when is_atom(A) ->
      atom;
    _ -> 
      big
  end.

tagged_val_of([]) -> hipe_tagscheme:mk_nil();
tagged_val_of(X) when is_integer(X) -> hipe_tagscheme:mk_fixnum(X).