summaryrefslogtreecommitdiff
path: root/ia32/SelectOp.vp
blob: 1471405ecf826cd0d667b8f018d19197916061ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
(* *********************************************************************)
(*                                                                     *)
(*              The Compcert verified compiler                         *)
(*                                                                     *)
(*          Xavier Leroy, INRIA Paris-Rocquencourt                     *)
(*                                                                     *)
(*  Copyright Institut National de Recherche en Informatique et en     *)
(*  Automatique.  All rights reserved.  This file is distributed       *)
(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
(*                                                                     *)
(* *********************************************************************)

(** Instruction selection for operators *)

(** The instruction selection pass recognizes opportunities for using
  combined arithmetic and logical operations and addressing modes
  offered by the target processor.  For instance, the expression [x + 1]
  can take advantage of the "immediate add" instruction of the processor,
  and on the PowerPC, the expression [(x >> 6) & 0xFF] can be turned
  into a "rotate and mask" instruction.

  This file defines functions for building CminorSel expressions and
  statements, especially expressions consisting of operator
  applications.  These functions examine their arguments to choose
  cheaper forms of operators whenever possible.

  For instance, [add e1 e2] will return a CminorSel expression semantically
  equivalent to [Eop Oadd (e1 ::: e2 ::: Enil)], but will use a
  [Oaddimm] operator if one of the arguments is an integer constant,
  or suppress the addition altogether if one of the arguments is the
  null integer.  In passing, we perform operator reassociation
  ([(e + c1) * c2] becomes [(e * c2) + (c1 * c2)]) and a small amount
  of constant propagation.

  On top of the "smart constructor" functions defined below,
  module [Selection] implements the actual instruction selection pass.
*)

Require Import Coqlib.
Require Import AST.
Require Import Integers.
Require Import Floats.
Require Import Op.
Require Import CminorSel.

Open Local Scope cminorsel_scope.

(** ** Constants **)

(** External oracle to determine whether a symbol is external and must
  be addressed through [Oaddrsymbol], or is local and can be addressed
  through [Olea Aglobal].  This is to accommodate MacOS X's limitations
  on references to data symbols imported from shared libraries. *)

Parameter symbol_is_external: ident -> bool.

Definition addrsymbol (id: ident) (ofs: int) :=
  if symbol_is_external id then
    if Int.eq ofs Int.zero
    then Eop (Oindirectsymbol id) Enil
    else Eop (Olea (Aindexed ofs)) (Eop (Oindirectsymbol id) Enil ::: Enil)
  else
    Eop (Olea (Aglobal id ofs)) Enil.

Definition addrstack (ofs: int) :=
  Eop (Olea (Ainstack ofs)) Enil.

(** ** Integer logical negation *)

Definition notint (e: expr) := Eop (Oxorimm Int.mone) (e ::: Enil).

(** ** Integer addition and pointer addition *)

Definition offset_addressing (a: addressing) (ofs: int) : addressing :=
  match a with
  | Aindexed n => Aindexed (Int.add n ofs)
  | Aindexed2 n => Aindexed2 (Int.add n ofs)
  | Ascaled sc n => Ascaled sc (Int.add n ofs)
  | Aindexed2scaled sc n => Aindexed2scaled sc (Int.add n ofs)
  | Aglobal id n => Aglobal id (Int.add n ofs)
  | Abased id n => Abased id (Int.add n ofs)
  | Abasedscaled sc id n => Abasedscaled sc id (Int.add n ofs)
  | Ainstack n => Ainstack (Int.add n ofs)
  end.

Nondetfunction addimm (n: int) (e: expr) :=
  if Int.eq n Int.zero then e else
  match e with
  | Eop (Ointconst m) Enil       => Eop (Ointconst(Int.add n m)) Enil
  | Eop (Olea addr) args         => Eop (Olea (offset_addressing addr n)) args
  | _                            => Eop (Olea (Aindexed n)) (e ::: Enil)
  end.

Nondetfunction add (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 => addimm n1 t2
  | t1, Eop (Ointconst n2) Enil => addimm n2 t1
  | Eop (Olea (Aindexed n1)) (t1:::Enil), Eop (Olea (Aindexed n2)) (t2:::Enil) =>
      Eop (Olea (Aindexed2 (Int.add n1 n2))) (t1:::t2:::Enil)
  | Eop (Olea (Aindexed n1)) (t1:::Enil), Eop (Olea (Ascaled sc n2)) (t2:::Enil) =>
      Eop (Olea (Aindexed2scaled sc (Int.add n1 n2))) (t1:::t2:::Enil)
  | Eop (Olea (Ascaled sc n1)) (t1:::Enil), Eop (Olea (Aindexed n2)) (t2:::Enil) =>
      Eop (Olea (Aindexed2scaled sc (Int.add n1 n2))) (t2:::t1:::Enil)
  | Eop (Olea (Aindexed n1)) (t1:::Enil), Eop (Olea (Aglobal id ofs)) Enil =>
      Eop (Olea (Abased id (Int.add ofs n1))) (t1:::Enil)
  | Eop (Olea (Aglobal id ofs)) Enil, Eop (Olea (Aindexed n2)) (t2:::Enil) =>
      Eop (Olea (Abased id (Int.add ofs n2))) (t2:::Enil)
  | Eop (Olea (Ascaled sc n1)) (t1:::Enil), Eop (Olea (Aglobal id ofs)) Enil =>
      Eop (Olea (Abasedscaled sc id (Int.add ofs n1))) (t1:::Enil)
  | Eop (Olea (Aglobal id ofs)) Enil, Eop (Olea (Ascaled sc n2)) (t2:::Enil) =>
      Eop (Olea (Abasedscaled sc id (Int.add ofs n2))) (t2:::Enil)
  | Eop (Olea (Ascaled sc n)) (t1:::Enil), t2 =>
      Eop (Olea (Aindexed2scaled sc n)) (t2:::t1:::Enil)
  | t1, Eop (Olea (Ascaled sc n)) (t2:::Enil) =>
      Eop (Olea (Aindexed2scaled sc n)) (t1:::t2:::Enil)
  | Eop (Olea (Aindexed n)) (t1:::Enil), t2 =>
      Eop (Olea (Aindexed2 n)) (t1:::t2:::Enil)
  | t1, Eop (Olea (Aindexed n)) (t2:::Enil) =>
      Eop (Olea (Aindexed2 n)) (t1:::t2:::Enil)
  | _, _ =>
      Eop (Olea (Aindexed2 Int.zero)) (e1:::e2:::Enil)
  end.

(** ** Integer and pointer subtraction *)

Nondetfunction sub (e1: expr) (e2: expr) :=
  match e1, e2 with
  | t1, Eop (Ointconst n2) Enil => addimm (Int.neg n2) t1
  | Eop (Olea (Aindexed n1)) (t1:::Enil), Eop (Olea (Aindexed n2)) (t2:::Enil) =>
      addimm (Int.sub n1 n2) (Eop Osub (t1:::t2:::Enil))
  | Eop (Olea (Aindexed n1)) (t1:::Enil), t2 =>
      addimm n1 (Eop Osub (t1:::t2:::Enil))
  | t1, Eop (Olea (Aindexed n2)) (t2:::Enil) =>
      addimm (Int.neg n2) (Eop Osub (t1:::t2:::Enil))
  | _, _ =>
      Eop Osub (e1:::e2:::Enil)
  end.

Definition negint (e: expr) := Eop Oneg (e ::: Enil).

(** ** Immediate shifts *)

Definition shift_is_scale (n: int) : bool :=
  Int.eq n (Int.repr 1) || Int.eq n (Int.repr 2) || Int.eq n (Int.repr 3).

Nondetfunction shlimm (e1: expr) (n: int) :=
  if Int.eq n Int.zero then e1 else
  match e1 with
  | Eop (Ointconst n1) Enil =>
      Eop (Ointconst(Int.shl n1 n)) Enil
  | Eop (Oshlimm n1) (t1:::Enil) =>
      if Int.ltu (Int.add n n1) Int.iwordsize
      then Eop (Oshlimm (Int.add n n1)) (t1:::Enil)
      else Eop (Oshlimm n) (e1:::Enil)
  | Eop (Olea (Aindexed n1)) (t1:::Enil) =>
      if shift_is_scale n
      then Eop (Olea (Ascaled (Int.shl Int.one n) (Int.shl n1 n))) (t1:::Enil)
      else Eop (Oshlimm n) (e1:::Enil)
  | _ =>
      if shift_is_scale n
      then Eop (Olea (Ascaled (Int.shl Int.one n) Int.zero)) (e1:::Enil)
      else Eop (Oshlimm n) (e1:::Enil)
  end.

Nondetfunction shruimm (e1: expr) (n: int) :=
  if Int.eq n Int.zero then e1 else
  match e1 with
  | Eop (Ointconst n1) Enil =>
      Eop (Ointconst(Int.shru n1 n)) Enil
  | Eop (Oshruimm n1) (t1:::Enil) =>
      if Int.ltu (Int.add n n1) Int.iwordsize
      then Eop (Oshruimm (Int.add n n1)) (t1:::Enil)
      else Eop (Oshruimm n) (e1:::Enil)
  | _ =>
      Eop (Oshruimm n) (e1:::Enil)
  end.

Nondetfunction shrimm (e1: expr) (n: int) :=
  if Int.eq n Int.zero then e1 else
  match e1 with
  | Eop (Ointconst n1) Enil =>
      Eop (Ointconst(Int.shr n1 n)) Enil
  | Eop (Oshrimm n1) (t1:::Enil) =>
      if Int.ltu (Int.add n n1) Int.iwordsize
      then Eop (Oshrimm (Int.add n n1)) (t1:::Enil)
      else Eop (Oshrimm n) (e1:::Enil)
  | _ =>
      Eop (Oshrimm n) (e1:::Enil)
  end.

(** ** Integer multiply *)

Definition mulimm_base (n1: int) (e2: expr) :=
  match Int.one_bits n1 with
  | i :: nil =>
      shlimm e2 i
  | i :: j :: nil =>
      Elet e2 (add (shlimm (Eletvar 0) i) (shlimm (Eletvar 0) j))
  | _ =>
      Eop (Omulimm n1) (e2:::Enil)
  end.

Nondetfunction mulimm (n1: int) (e2: expr) :=
  if Int.eq n1 Int.zero then Eop (Ointconst Int.zero) Enil
  else if Int.eq n1 Int.one then e2
  else match e2 with
  | Eop (Ointconst n2) Enil => Eop (Ointconst(Int.mul n1 n2)) Enil
  | Eop (Olea (Aindexed n2)) (t2:::Enil) => addimm (Int.mul n1 n2) (mulimm_base n1 t2)
  | _ => mulimm_base n1 e2
  end.

Nondetfunction mul (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 => mulimm n1 t2
  | t1, Eop (Ointconst n2) Enil => mulimm n2 t1
  | _, _ => Eop Omul (e1:::e2:::Enil)
  end.

(** ** Bitwise and, or, xor *)

Nondetfunction andimm (n1: int) (e2: expr) :=
  if Int.eq n1 Int.zero then Eop (Ointconst Int.zero) Enil
  else if Int.eq n1 Int.mone then e2
  else match e2 with
  | Eop (Ointconst n2) Enil =>
      Eop (Ointconst (Int.and n1 n2)) Enil
  | Eop (Oandimm n2) (t2:::Enil) =>
     Eop (Oandimm (Int.and n1 n2)) (t2:::Enil)
  | Eop Ocast8unsigned (t2:::Enil) =>
     Eop (Oandimm (Int.and n1 (Int.repr 255))) (t2:::Enil)
  | Eop Ocast16unsigned (t2:::Enil) =>
     Eop (Oandimm (Int.and n1 (Int.repr 65535))) (t2:::Enil)
  | _ =>
     Eop (Oandimm n1) (e2:::Enil)
  end.

Nondetfunction and (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 => andimm n1 t2
  | t1, Eop (Ointconst n2) Enil => andimm n2 t1
  | _, _ => Eop Oand (e1:::e2:::Enil)
  end.

Nondetfunction orimm (n1: int) (e2: expr) :=
  if Int.eq n1 Int.zero then e2
  else if Int.eq n1 Int.mone then Eop (Ointconst Int.mone) Enil
  else match e2 with
  | Eop (Ointconst n2) Enil =>
      Eop (Ointconst (Int.or n1 n2)) Enil
  | Eop (Oorimm n2) (t2:::Enil) =>
     Eop (Oorimm (Int.or n1 n2)) (t2:::Enil)
  | _ =>
     Eop (Oorimm n1) (e2:::Enil)
  end.

Definition same_expr_pure (e1 e2: expr) :=
  match e1, e2 with
  | Evar v1, Evar v2 => if ident_eq v1 v2 then true else false
  | _, _ => false
  end.

Nondetfunction or (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 => orimm n1 t2
  | t1, Eop (Ointconst n2) Enil => orimm n2 t1
  | Eop (Oshlimm n1) (t1:::Enil), Eop (Oshruimm n2) (t2:::Enil) =>
      if Int.eq (Int.add n1 n2) Int.iwordsize then
        if same_expr_pure t1 t2
        then Eop (Ororimm n2) (t1:::Enil)
        else Eop (Oshldimm n1) (t1:::t2:::Enil)
      else Eop Oor (e1:::e2:::Enil)
  | Eop (Oshruimm n2) (t2:::Enil), Eop (Oshlimm n1) (t1:::Enil) =>
      if Int.eq (Int.add n1 n2) Int.iwordsize then
        if same_expr_pure t1 t2
        then Eop (Ororimm n2) (t1:::Enil)
        else Eop (Oshldimm n1) (t1:::t2:::Enil)
      else Eop Oor (e1:::e2:::Enil)
  | _, _ =>
      Eop Oor (e1:::e2:::Enil)
  end.

Nondetfunction xorimm (n1: int) (e2: expr) :=
  if Int.eq n1 Int.zero then e2
  else match e2 with
  | Eop (Ointconst n2) Enil =>
      Eop (Ointconst (Int.xor n1 n2)) Enil
  | Eop (Oxorimm n2) (t2:::Enil) =>
     Eop (Oxorimm (Int.xor n1 n2)) (t2:::Enil)
  | _ =>
     Eop (Oxorimm n1) (e2:::Enil)
  end.

Nondetfunction xor (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 => xorimm n1 t2
  | t1, Eop (Ointconst n2) Enil => xorimm n2 t1
  | _, _ => Eop Oxor (e1:::e2:::Enil)
  end.

(** ** Integer division and modulus *)

Definition divu_base (e1: expr) (e2: expr) := Eop Odivu (e1:::e2:::Enil).
Definition modu_base (e1: expr) (e2: expr) := Eop Omodu (e1:::e2:::Enil).
Definition divs_base (e1: expr) (e2: expr) := Eop Odiv (e1:::e2:::Enil).
Definition mods_base (e1: expr) (e2: expr) := Eop Omod (e1:::e2:::Enil).

Definition shrximm (e1: expr) (n2: int) :=
  if Int.eq n2 Int.zero then e1 else Eop (Oshrximm n2) (e1:::Enil).

(** ** General shifts *)

Nondetfunction shl (e1: expr) (e2: expr) :=
  match e2 with
  | Eop (Ointconst n2) Enil => shlimm e1 n2
  | _ => Eop Oshl (e1:::e2:::Enil)
  end.

Nondetfunction shr (e1: expr) (e2: expr) :=
  match e2 with
  | Eop (Ointconst n2) Enil => shrimm e1 n2
  | _ => Eop Oshr (e1:::e2:::Enil)
  end.

Nondetfunction shru (e1: expr) (e2: expr) :=
  match e2 with
  | Eop (Ointconst n2) Enil => shruimm e1 n2
  | _ => Eop Oshru (e1:::e2:::Enil)
  end.

(** ** Floating-point arithmetic *)

Definition negf (e: expr) :=  Eop Onegf (e ::: Enil).
Definition absf (e: expr) :=  Eop Oabsf (e ::: Enil).
Definition addf (e1 e2: expr) :=  Eop Oaddf (e1 ::: e2 ::: Enil).
Definition subf (e1 e2: expr) :=  Eop Osubf (e1 ::: e2 ::: Enil).
Definition mulf (e1 e2: expr) :=  Eop Omulf (e1 ::: e2 ::: Enil).

Definition divfimm (e: expr) (n: float) :=
  match Float.exact_inverse n with
  | Some n' => Eop Omulf (e ::: Eop (Ofloatconst n') Enil ::: Enil)
  | None    => Eop Odivf (e ::: Eop (Ofloatconst n) Enil ::: Enil)
  end.

Nondetfunction divf (e1: expr) (e2: expr) :=
  match e2 with
  | Eop (Ofloatconst n2) Enil => divfimm e1 n2
  | _ => Eop Odivf (e1 ::: e2 ::: Enil)
  end.

(** ** Comparisons *)

Nondetfunction compimm (default: comparison -> int -> condition)
                       (sem: comparison -> int -> int -> bool)
                       (c: comparison) (e1: expr) (n2: int) :=
  match c, e1 with
  | c, Eop (Ointconst n1) Enil =>
      Eop (Ointconst (if sem c n1 n2 then Int.one else Int.zero)) Enil
  | Ceq, Eop (Ocmp c) el =>
      if Int.eq_dec n2 Int.zero then
        Eop (Ocmp (negate_condition c)) el
      else if Int.eq_dec n2 Int.one then
        Eop (Ocmp c) el
      else 
        Eop (Ointconst Int.zero) Enil
  | Cne, Eop (Ocmp c) el =>
      if Int.eq_dec n2 Int.zero then
        Eop (Ocmp c) el
      else if Int.eq_dec n2 Int.one then
        Eop (Ocmp (negate_condition c)) el
      else 
        Eop (Ointconst Int.one) Enil
  | Ceq, Eop (Oandimm n1) (t1 ::: Enil) =>
      if Int.eq_dec n2 Int.zero then
        Eop (Ocmp (Cmaskzero n1)) (t1 ::: Enil)
      else
        Eop (Ocmp (default c n2)) (e1 ::: Enil)
  | Cne, Eop (Oandimm n1) (t1 ::: Enil) =>
      if Int.eq_dec n2 Int.zero then
        Eop (Ocmp (Cmasknotzero n1)) (t1 ::: Enil)
      else
        Eop (Ocmp (default c n2)) (e1 ::: Enil)
  | _, _ =>
       Eop (Ocmp (default c n2)) (e1 ::: Enil)
  end.

Nondetfunction comp (c: comparison) (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 =>
      compimm Ccompimm Int.cmp (swap_comparison c) t2 n1
  | t1, Eop (Ointconst n2) Enil =>
      compimm Ccompimm Int.cmp c t1 n2
  | _, _ =>
      Eop (Ocmp (Ccomp c)) (e1 ::: e2 ::: Enil)
  end.

Nondetfunction compu (c: comparison) (e1: expr) (e2: expr) :=
  match e1, e2 with
  | Eop (Ointconst n1) Enil, t2 =>
      compimm Ccompuimm Int.cmpu (swap_comparison c) t2 n1
  | t1, Eop (Ointconst n2) Enil =>
      compimm Ccompuimm Int.cmpu c t1 n2
  | _, _ =>
      Eop (Ocmp (Ccompu c)) (e1 ::: e2 ::: Enil)
  end.

Definition compf (c: comparison) (e1: expr) (e2: expr) :=
  Eop (Ocmp (Ccompf c)) (e1 ::: e2 ::: Enil).

(** ** Integer conversions *)

Nondetfunction cast8unsigned (e: expr) := 
  match e with
  | Eop (Oandimm n) (t:::Enil) =>
      Eop (Oandimm (Int.and (Int.repr 255) n)) (t:::Enil)
  | _ =>
      Eop Ocast8unsigned (e:::Enil)
  end.

Definition cast8signed (e: expr) := Eop Ocast8signed (e ::: Enil).

Nondetfunction cast16unsigned (e: expr) := 
  match e with
  | Eop (Oandimm n) (t:::Enil) =>
      Eop (Oandimm (Int.and (Int.repr 65535) n)) (t:::Enil)
  | _ =>
      Eop Ocast16unsigned (e:::Enil)
  end.

Definition cast16signed (e: expr) := Eop Ocast16signed (e ::: Enil).

(** Floating-point conversions *)

Definition singleoffloat (e: expr) := Eop Osingleoffloat (e ::: Enil).
Definition intoffloat (e: expr) := Eop Ointoffloat (e ::: Enil).
Definition floatofint (e: expr) := Eop Ofloatofint (e ::: Enil).

Definition intuoffloat (e: expr) :=
  Elet e
    (Elet (Eop (Ofloatconst (Float.floatofintu Float.ox8000_0000)) Enil)
      (Econdition (CEcond (Ccompf Clt) (Eletvar 1 ::: Eletvar 0 ::: Enil))
        (intoffloat (Eletvar 1))
        (addimm Float.ox8000_0000 (intoffloat (subf (Eletvar 1) (Eletvar 0))))))%nat.

Definition floatofintu (e: expr) :=
  let f := Eop (Ofloatconst (Float.floatofintu Float.ox8000_0000)) Enil in
  Elet e
    (Econdition (CEcond (Ccompuimm Clt Float.ox8000_0000) (Eletvar O ::: Enil))
      (floatofint (Eletvar O))
      (addf (floatofint (addimm (Int.neg Float.ox8000_0000) (Eletvar O))) f)).

(** ** Addressing modes *)

Nondetfunction addressing (chunk: memory_chunk) (e: expr) :=
  match e with
  | Eop (Olea addr) args => (addr, args)
  | _ => (Aindexed Int.zero, e:::Enil)
  end.