lower_dw.c 92.9 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
/*
2
 * Copyright (C) 1995-2011 University of Karlsruhe.  All right reserved.
Christian Würdig's avatar
Christian Würdig committed
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

Michael Beck's avatar
Michael Beck committed
20
21
/**
 * @file
yb9976's avatar
yb9976 committed
22
 * @brief   Lower double word operations, i.e. 64bit -> 32bit, 32bit -> 16bit etc.
Michael Beck's avatar
Michael Beck committed
23
24
 * @date    8.10.2004
 * @author  Michael Beck
25
 */
Matthias Braun's avatar
Matthias Braun committed
26
#include "config.h"
27

28
#include <string.h>
29
#include <stdlib.h>
30
#include <stdbool.h>
31
32
#include <assert.h>

yb9976's avatar
yb9976 committed
33
#include "be.h"
34
#include "error.h"
35
#include "lowering.h"
36
#include "irnode_t.h"
yb9976's avatar
yb9976 committed
37
#include "irnodeset.h"
38
39
40
41
42
43
44
45
46
47
48
49
#include "irgraph_t.h"
#include "irmode_t.h"
#include "iropt_t.h"
#include "irgmod.h"
#include "tv_t.h"
#include "dbginfo_t.h"
#include "iropt_dbg.h"
#include "irflag_t.h"
#include "firmstat.h"
#include "irgwalk.h"
#include "ircons.h"
#include "irflag.h"
yb9976's avatar
yb9976 committed
50
#include "iroptimize.h"
51
52
53
54
55
#include "irtools.h"
#include "debug.h"
#include "set.h"
#include "pmap.h"
#include "pdeq.h"
Christian Würdig's avatar
Christian Würdig committed
56
#include "irdump.h"
57
#include "array_t.h"
Michael Beck's avatar
Michael Beck committed
58
#include "irpass_t.h"
59
#include "lower_dw.h"
60

Michael Beck's avatar
Michael Beck committed
61
/** A map from (op, imode, omode) to Intrinsic functions entities. */
62
63
static set *intrinsic_fkt;

Michael Beck's avatar
Michael Beck committed
64
65
66
/** A map from (imode, omode) to conv function types. */
static set *conv_types;

67
68
69
/** A map from a method type to its lowered type. */
static pmap *lowered_type;

yb9976's avatar
yb9976 committed
70
71
72
73
/** A map from a builtin type to its lower and higher type. */
static pmap *lowered_builtin_type_high;
static pmap *lowered_builtin_type_low;

74
/** The types for the binop and unop intrinsics. */
75
static ir_type *binop_tp_u, *binop_tp_s, *unop_tp_u, *unop_tp_s, *tp_s, *tp_u;
76

yb9976's avatar
yb9976 committed
77
78
static ir_nodeset_t created_mux_nodes;

79
80
81
82
/** the debug handle */
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

/**
Michael Beck's avatar
Michael Beck committed
83
 * An entry in the (op, imode, omode) -> entity map.
84
 */
85
typedef struct op_mode_entry {
86
	const ir_op   *op;    /**< the op */
Michael Beck's avatar
Michael Beck committed
87
88
	const ir_mode *imode; /**< the input mode */
	const ir_mode *omode; /**< the output mode */
89
	ir_entity     *ent;   /**< the associated entity of this (op, imode, omode) triple */
90
91
} op_mode_entry_t;

Michael Beck's avatar
Michael Beck committed
92
93
94
/**
 * An entry in the (imode, omode) -> tp map.
 */
95
typedef struct conv_tp_entry {
Michael Beck's avatar
Michael Beck committed
96
97
98
99
100
	const ir_mode *imode; /**< the input mode */
	const ir_mode *omode; /**< the output mode */
	ir_type       *mtd;   /**< the associated method type of this (imode, omode) pair */
} conv_tp_entry_t;

101
enum lower_flags {
102
103
	MUST_BE_LOWERED = 1,  /**< graph must be lowered */
	CF_CHANGED      = 2,  /**< control flow was changed */
104
105
106
107
108
};

/**
 * The lower environment.
 */
109
110
typedef struct lower_dw_env_t {
	lower64_entry_t **entries;     /**< entries per node */
111
	ir_graph      *irg;
112
113
114
	struct obstack obst;           /**< an obstack holding the temporary data */
	ir_tarval *tv_mode_bytes;      /**< a tarval containing the number of bytes in the lowered modes */
	ir_tarval *tv_mode_bits;       /**< a tarval containing the number of bits in the lowered modes */
Matthias Braun's avatar
Matthias Braun committed
115
116
117
118
119
120
121
122
	pdeq      *waitq;              /**< a wait queue of all nodes that must be handled later */
	ir_node  **lowered_phis;       /**< list of lowered phis */
	ir_mode   *high_signed;        /**< doubleword signed type */
	ir_mode   *high_unsigned;      /**< doubleword unsigned type */
	ir_mode   *low_signed;         /**< word signed type */
	ir_mode   *low_unsigned;       /**< word unsigned type */
	ident     *first_id;           /**< .l for little and .h for big endian */
	ident     *next_id;            /**< .h for little and .l for big endian */
123
124
125
126
	const lwrdw_param_t *params;   /**< transformation parameter */
	unsigned flags;                /**< some flags */
	unsigned n_entries;            /**< number of entries */
} lower_dw_env_t;
127

128
129
130
static lower_dw_env_t *env;

static void lower_node(ir_node *node);
131

Michael Beck's avatar
Michael Beck committed
132
133
134
/**
 * Create a method type for a Conv emulation from imode to omode.
 */
135
static ir_type *get_conv_type(ir_mode *imode, ir_mode *omode)
136
{
Michael Beck's avatar
Michael Beck committed
137
138
139
140
141
142
143
	conv_tp_entry_t key, *entry;
	ir_type *mtd;

	key.imode = imode;
	key.omode = omode;
	key.mtd   = NULL;

144
	entry = (conv_tp_entry_t*)set_insert(conv_types, &key, sizeof(key), hash_ptr(imode) ^ hash_ptr(omode));
Michael Beck's avatar
Michael Beck committed
145
146
147
	if (! entry->mtd) {
		int n_param = 1, n_res = 1;

148
		if (imode == env->high_signed || imode == env->high_unsigned)
Michael Beck's avatar
Michael Beck committed
149
			n_param = 2;
150
		if (omode == env->high_signed || omode == env->high_unsigned)
Michael Beck's avatar
Michael Beck committed
151
152
153
			n_res = 2;

		/* create a new one */
154
		mtd = new_type_method(n_param, n_res);
Michael Beck's avatar
Michael Beck committed
155
156
157

		/* set param types and result types */
		n_param = 0;
158
		if (imode == env->high_signed) {
159
160
161
162
163
164
165
			if (env->params->little_endian) {
				set_method_param_type(mtd, n_param++, tp_u);
				set_method_param_type(mtd, n_param++, tp_s);
			} else {
				set_method_param_type(mtd, n_param++, tp_s);
				set_method_param_type(mtd, n_param++, tp_u);
			}
166
		} else if (imode == env->high_unsigned) {
Michael Beck's avatar
Michael Beck committed
167
168
			set_method_param_type(mtd, n_param++, tp_u);
			set_method_param_type(mtd, n_param++, tp_u);
Michael Beck's avatar
BugFix:    
Michael Beck committed
169
		} else {
170
			ir_type *tp = get_type_for_mode(imode);
Michael Beck's avatar
Michael Beck committed
171
			set_method_param_type(mtd, n_param++, tp);
172
		}
Michael Beck's avatar
Michael Beck committed
173
174

		n_res = 0;
175
		if (omode == env->high_signed) {
176
177
178
179
180
181
182
			if (env->params->little_endian) {
				set_method_res_type(mtd, n_res++, tp_u);
				set_method_res_type(mtd, n_res++, tp_s);
			} else {
				set_method_res_type(mtd, n_res++, tp_s);
				set_method_res_type(mtd, n_res++, tp_u);
			}
183
		} else if (omode == env->high_unsigned) {
Michael Beck's avatar
Michael Beck committed
184
185
			set_method_res_type(mtd, n_res++, tp_u);
			set_method_res_type(mtd, n_res++, tp_u);
Michael Beck's avatar
BugFix:    
Michael Beck committed
186
		} else {
187
			ir_type *tp = get_type_for_mode(omode);
Michael Beck's avatar
Michael Beck committed
188
			set_method_res_type(mtd, n_res++, tp);
189
		}
Michael Beck's avatar
Michael Beck committed
190
		entry->mtd = mtd;
Michael Beck's avatar
BugFix:    
Michael Beck committed
191
	} else {
Michael Beck's avatar
Michael Beck committed
192
		mtd = entry->mtd;
193
	}
Michael Beck's avatar
Michael Beck committed
194
	return mtd;
195
}
Michael Beck's avatar
Michael Beck committed
196

197
198
199
200
201
202
203
204
/**
 * Add an additional control flow input to a block.
 * Patch all Phi nodes. The new Phi inputs are copied from
 * old input number nr.
 */
static void add_block_cf_input_nr(ir_node *block, int nr, ir_node *cf)
{
	int i, arity = get_irn_arity(block);
205
206
	ir_node **in;
	const ir_edge_t *edge;
207
208
209
210
211
212
213
214
215
216

	assert(nr < arity);

	NEW_ARR_A(ir_node *, in, arity + 1);
	for (i = 0; i < arity; ++i)
		in[i] = get_irn_n(block, i);
	in[i] = cf;

	set_irn_in(block, i + 1, in);

217
218
219
220
221
	foreach_out_edge(block, edge) {
		ir_node *phi = get_edge_src_irn(edge);
		if (!is_Phi(phi))
			continue;

222
223
224
225
		for (i = 0; i < arity; ++i)
			in[i] = get_irn_n(phi, i);
		in[i] = in[nr];
		set_irn_in(phi, i + 1, in);
226
227
	}
}
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242

/**
 * Add an additional control flow input to a block.
 * Patch all Phi nodes. The new Phi inputs are copied from
 * old input from cf tmpl.
 */
static void add_block_cf_input(ir_node *block, ir_node *tmpl, ir_node *cf)
{
	int i, arity = get_irn_arity(block);
	int nr = 0;

	for (i = 0; i < arity; ++i) {
		if (get_irn_n(block, i) == tmpl) {
			nr = i;
			break;
243
244
		}
	}
245
246
	assert(i < arity);
	add_block_cf_input_nr(block, nr, cf);
247
}
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266

/**
 * Return the "operational" mode of a Firm node.
 */
static ir_mode *get_irn_op_mode(ir_node *node)
{
	switch (get_irn_opcode(node)) {
	case iro_Load:
		return get_Load_mode(node);
	case iro_Store:
		return get_irn_mode(get_Store_value(node));
	case iro_Div:
		return get_irn_mode(get_Div_left(node));
	case iro_Mod:
		return get_irn_mode(get_Mod_left(node));
	case iro_Cmp:
		return get_irn_mode(get_Cmp_left(node));
	default:
		return get_irn_mode(node);
267
268
	}
}
269
270

/**
271
272
 * Walker, prepare the node links and determine which nodes need to be lowered
 * at all.
273
 */
274
static void prepare_links(ir_node *node)
275
{
276
277
	ir_mode         *mode = get_irn_op_mode(node);
	lower64_entry_t *link;
278

279
	if (mode == env->high_signed || mode == env->high_unsigned) {
280
		unsigned idx = get_irn_idx(node);
281
		/* ok, found a node that will be lowered */
282
		link = OALLOCZ(&env->obst, lower64_entry_t);
283

284
		if (idx >= env->n_entries) {
Michael Beck's avatar
Michael Beck committed
285
			/* enlarge: this happens only for Rotl nodes which is RARELY */
286
			unsigned old   = env->n_entries;
287
			unsigned n_idx = idx + (idx >> 3);
Michael Beck's avatar
Michael Beck committed
288

289
			ARR_RESIZE(lower64_entry_t *, env->entries, n_idx);
290
291
			memset(&env->entries[old], 0, (n_idx - old) * sizeof(env->entries[0]));
			env->n_entries = n_idx;
Michael Beck's avatar
Michael Beck committed
292
		}
293
294
		env->entries[idx] = link;
		env->flags |= MUST_BE_LOWERED;
295
	} else if (is_Conv(node)) {
296
297
298
299
		/* Conv nodes have two modes */
		ir_node *pred = get_Conv_op(node);
		mode = get_irn_mode(pred);

300
		if (mode == env->high_signed || mode == env->high_unsigned) {
Michael Beck's avatar
BugFix:    
Michael Beck committed
301
			/* must lower this node either but don't need a link */
302
			env->flags |= MUST_BE_LOWERED;
303
		}
304
		return;
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
	} else if (is_Call(node)) {
		/* Special case:  If the result of the Call is never used, we won't
		 * find a Proj with a mode that potentially triggers MUST_BE_LOWERED
		 * to be set.  Thus, if we see a call, we check its result types and
		 * decide whether MUST_BE_LOWERED has to be set.
		 */
		ir_type *tp = get_Call_type(node);
		size_t   n_res, i;

		n_res = get_method_n_ress(tp);
		for (i = 0; i < n_res; ++i) {
			ir_type *rtp = get_method_res_type(tp, i);

			if (is_Primitive_type(rtp)) {
				ir_mode *rmode = get_type_mode(rtp);

				if (rmode == env->high_signed || rmode == env->high_unsigned) {
					env->flags |= MUST_BE_LOWERED;
				}
			}
		}
326
327
	}
}
328

329
lower64_entry_t *get_node_entry(ir_node *node)
330
331
332
333
334
335
{
	unsigned idx = get_irn_idx(node);
	assert(idx < env->n_entries);
	return env->entries[idx];
}

336
void ir_set_dw_lowered(ir_node *old, ir_node *new_low, ir_node *new_high)
337
{
338
	lower64_entry_t *entry = get_node_entry(old);
339
340
341
342
	entry->low_word  = new_low;
	entry->high_word = new_high;
}

343
344
345
346
347
ir_mode *ir_get_low_unsigned_mode(void)
{
	return env->low_unsigned;
}

348
349
350
/**
 * Translate a Constant: create two.
 */
351
static void lower_Const(ir_node *node, ir_mode *mode)
352
{
Matthias Braun's avatar
Matthias Braun committed
353
354
355
356
357
358
359
360
361
	ir_graph  *irg      = get_irn_irg(node);
	dbg_info  *dbg      = get_irn_dbg_info(node);
	ir_mode   *low_mode = env->low_unsigned;
	ir_tarval *tv       = get_Const_tarval(node);
	ir_tarval *tv_l     = tarval_convert_to(tv, low_mode);
	ir_node   *res_low  = new_rd_Const(dbg, irg, tv_l);
	ir_tarval *tv_shrs  = tarval_shrs(tv, env->tv_mode_bits);
	ir_tarval *tv_h     = tarval_convert_to(tv_shrs, mode);
	ir_node   *res_high = new_rd_Const(dbg, irg, tv_h);
362

363
	ir_set_dw_lowered(node, res_low, res_high);
364
}
365
366
367
368

/**
 * Translate a Load: create two.
 */
369
static void lower_Load(ir_node *node, ir_mode *mode)
370
{
371
	ir_mode    *low_mode = env->low_unsigned;
372
	ir_graph   *irg = get_irn_irg(node);
373
374
	ir_node    *adr = get_Load_ptr(node);
	ir_node    *mem = get_Load_mem(node);
375
376
377
	ir_node    *low;
	ir_node    *high;
	ir_node    *proj_m;
378
379
	dbg_info   *dbg;
	ir_node    *block = get_nodes_block(node);
380
	ir_cons_flags volatility = get_Load_volatility(node) == volatility_is_volatile
381
	                         ? cons_volatile : cons_none;
382
383
	const ir_edge_t *edge;
	const ir_edge_t *next;
384
385
386

	if (env->params->little_endian) {
		low  = adr;
387
		high = new_r_Add(block, adr, new_r_Const(irg, env->tv_mode_bytes), get_irn_mode(adr));
Michael Beck's avatar
BugFix:    
Michael Beck committed
388
	} else {
389
		low  = new_r_Add(block, adr, new_r_Const(irg, env->tv_mode_bytes), get_irn_mode(adr));
390
		high = adr;
391
	}
392
393

	/* create two loads */
394
395
396
397
	dbg    = get_irn_dbg_info(node);
	low    = new_rd_Load(dbg, block, mem,  low,  low_mode, volatility);
	proj_m = new_r_Proj(low, mode_M, pn_Load_M);
	high   = new_rd_Load(dbg, block, proj_m, high, mode, volatility);
398

399
400
401
402
	foreach_out_edge_safe(node, edge, next) {
		ir_node *proj = get_edge_src_irn(edge);
		if (!is_Proj(proj))
			continue;
403
404
405
406
407
408
409
410
411
412

		switch (get_Proj_proj(proj)) {
		case pn_Load_M:         /* Memory result. */
			/* put it to the second one */
			set_Proj_pred(proj, high);
			break;
		case pn_Load_X_except:  /* Execution result if exception occurred. */
			/* put it to the first one */
			set_Proj_pred(proj, low);
			break;
413
414
415
		case pn_Load_res: {       /* Result of load operation. */
			ir_node *res_low  = new_r_Proj(low,  low_mode, pn_Load_res);
			ir_node *res_high = new_r_Proj(high, mode,     pn_Load_res);
416
			ir_set_dw_lowered(proj, res_low, res_high);
417
			break;
418
		}
419
420
		default:
			assert(0 && "unexpected Proj number");
421
		}
422
423
		/* mark this proj: we have handled it already, otherwise we might fall
		 * into out new nodes. */
424
		mark_irn_visited(proj);
425
426
	}
}
427
428
429
430

/**
 * Translate a Store: create two.
 */
431
static void lower_Store(ir_node *node, ir_mode *mode)
432
{
433
434
	ir_graph              *irg;
	ir_node               *block, *adr, *mem;
435
	ir_node               *low, *high, *proj_m;
436
437
438
	dbg_info              *dbg;
	ir_node               *value = get_Store_value(node);
	const lower64_entry_t *entry = get_node_entry(value);
439
	ir_cons_flags volatility = get_Store_volatility(node) == volatility_is_volatile
440
	                           ? cons_volatile : cons_none;
441
442
	const ir_edge_t *edge;
	const ir_edge_t *next;
Matthias Braun's avatar
Matthias Braun committed
443
	(void) mode;
444
445
446
447
448
449
450

	assert(entry);

	if (! entry->low_word) {
		/* not ready yet, wait */
		pdeq_putr(env->waitq, node);
		return;
451
	}
452

453
	irg = get_irn_irg(node);
454
455
456
457
458
459
	adr = get_Store_ptr(node);
	mem = get_Store_mem(node);
	block = get_nodes_block(node);

	if (env->params->little_endian) {
		low  = adr;
460
		high = new_r_Add(block, adr, new_r_Const(irg, env->tv_mode_bytes), get_irn_mode(adr));
Michael Beck's avatar
BugFix:    
Michael Beck committed
461
	} else {
462
		low  = new_r_Add(block, adr, new_r_Const(irg, env->tv_mode_bytes), get_irn_mode(adr));
463
		high = adr;
464
	}
465
466

	/* create two Stores */
467
468
469
470
	dbg    = get_irn_dbg_info(node);
	low    = new_rd_Store(dbg, block, mem, low,  entry->low_word, volatility);
	proj_m = new_r_Proj(low, mode_M, pn_Store_M);
	high   = new_rd_Store(dbg, block, proj_m, high, entry->high_word, volatility);
471

472
473
474
475
	foreach_out_edge_safe(node, edge, next) {
		ir_node *proj = get_edge_src_irn(edge);
		if (!is_Proj(proj))
			continue;
476
477
478
479
480
481
482
483
484
485
486
487

		switch (get_Proj_proj(proj)) {
		case pn_Store_M:         /* Memory result. */
			/* put it to the second one */
			set_Proj_pred(proj, high);
			break;
		case pn_Store_X_except:  /* Execution result if exception occurred. */
			/* put it to the first one */
			set_Proj_pred(proj, low);
			break;
		default:
			assert(0 && "unexpected Proj number");
488
		}
489
490
491
		/* mark this proj: we have handled it already, otherwise we might fall into
		 * out new nodes. */
		mark_irn_visited(proj);
492
493
	}
}
494
495
496

/**
 * Return a node containing the address of the intrinsic emulation function.
Michael Beck's avatar
Michael Beck committed
497
498
499
500
501
502
 *
 * @param method  the method type of the emulation function
 * @param op      the emulated ir_op
 * @param imode   the input mode of the emulated opcode
 * @param omode   the output mode of the emulated opcode
 * @param env     the lower environment
503
 */
Michael Beck's avatar
Michael Beck committed
504
static ir_node *get_intrinsic_address(ir_type *method, ir_op *op,
505
                                      ir_mode *imode, ir_mode *omode)
506
{
507
	symconst_symbol sym;
508
	ir_entity *ent;
509
510
	op_mode_entry_t key, *entry;

Michael Beck's avatar
Michael Beck committed
511
512
513
514
	key.op    = op;
	key.imode = imode;
	key.omode = omode;
	key.ent   = NULL;
515

516
	entry = (op_mode_entry_t*)set_insert(intrinsic_fkt, &key, sizeof(key),
517
				hash_ptr(op) ^ hash_ptr(imode) ^ (hash_ptr(omode) << 8));
518
519
	if (! entry->ent) {
		/* create a new one */
Michael Beck's avatar
Michael Beck committed
520
		ent = env->params->create_intrinsic(method, op, imode, omode, env->params->ctx);
521
522
523

		assert(ent && "Intrinsic creator must return an entity");
		entry->ent = ent;
Michael Beck's avatar
BugFix:    
Michael Beck committed
524
	} else {
525
		ent = entry->ent;
526
	}
527
	sym.entity_p = ent;
528
	return new_r_SymConst(env->irg, mode_P_code, sym, symconst_addr_ent);
529
}
530
531
532
533
534
535

/**
 * Translate a Div.
 *
 * Create an intrinsic Call.
 */
536
static void lower_Div(ir_node *node, ir_mode *mode)
537
{
538
539
540
541
542
543
544
545
546
547
548
549
550
	ir_node         *left   = get_Div_left(node);
	ir_node         *right  = get_Div_right(node);
	ir_node         *block  = get_nodes_block(node);
	dbg_info        *dbgi   = get_irn_dbg_info(node);
	ir_type         *mtp    = mode_is_signed(mode) ? binop_tp_s : binop_tp_u;
	ir_mode         *opmode = get_irn_op_mode(node);
	ir_node         *addr
	    = get_intrinsic_address(mtp, get_irn_op(node), opmode, opmode);
	ir_node         *in[4];
	ir_node         *call;
	ir_node         *resproj;
	const ir_edge_t *edge;
	const ir_edge_t *next;
551

552
553
554
555
556
557
558
559
560
561
562
563
564
	if (env->params->little_endian) {
		in[0] = get_lowered_low(left);
		in[1] = get_lowered_high(left);
		in[2] = get_lowered_low(right);
		in[3] = get_lowered_high(right);
	} else {
		in[0] = get_lowered_high(left);
		in[1] = get_lowered_low(left);
		in[2] = get_lowered_high(right);
		in[3] = get_lowered_low(right);
	}
	call    = new_rd_Call(dbgi, block, get_Div_mem(node), addr, 4, in, mtp);
	resproj = new_r_Proj(call, mode_T, pn_Call_T_result);
565
566
	set_irn_pinned(call, get_irn_pinned(node));

567
568
569
570
571
	foreach_out_edge_safe(node, edge, next) {
		ir_node *proj = get_edge_src_irn(edge);
		if (!is_Proj(proj))
			continue;

572
573
574
575
		switch (get_Proj_proj(proj)) {
		case pn_Div_M:         /* Memory result. */
			/* reroute to the call */
			set_Proj_pred(proj, call);
576
			set_Proj_proj(proj, pn_Call_M);
577
			break;
578
579
580
581
582
		case pn_Div_X_regular:
			set_Proj_pred(proj, call);
			set_Proj_proj(proj, pn_Call_X_regular);
			break;
		case pn_Div_X_except:
583
584
585
			set_Proj_pred(proj, call);
			set_Proj_proj(proj, pn_Call_X_except);
			break;
586
587
588
589
590
591
592
593
594
595
		case pn_Div_res:
			if (env->params->little_endian) {
				ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 0);
				ir_node *res_high = new_r_Proj(resproj, mode,              1);
				ir_set_dw_lowered(proj, res_low, res_high);
			} else {
				ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 1);
				ir_node *res_high = new_r_Proj(resproj, mode,              0);
				ir_set_dw_lowered(proj, res_low, res_high);
			}
596
597
598
			break;
		default:
			assert(0 && "unexpected Proj number");
599
		}
600
601
602
		/* mark this proj: we have handled it already, otherwise we might fall into
		 * out new nodes. */
		mark_irn_visited(proj);
603
604
	}
}
605
606
607
608
609
610

/**
 * Translate a Mod.
 *
 * Create an intrinsic Call.
 */
611
static void lower_Mod(ir_node *node, ir_mode *mode)
612
{
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
	ir_node         *left   = get_Mod_left(node);
	ir_node         *right  = get_Mod_right(node);
	dbg_info        *dbgi   = get_irn_dbg_info(node);
	ir_node         *block  = get_nodes_block(node);
	ir_type         *mtp    = mode_is_signed(mode) ? binop_tp_s : binop_tp_u;
	ir_mode         *opmode = get_irn_op_mode(node);
	ir_node         *addr
	    = get_intrinsic_address(mtp, get_irn_op(node), opmode, opmode);
	ir_node         *in[4];
	ir_node         *call;
	ir_node         *resproj;
	const ir_edge_t *edge;
	const ir_edge_t *next;

	if (env->params->little_endian) {
		in[0] = get_lowered_low(left);
		in[1] = get_lowered_high(left);
		in[2] = get_lowered_low(right);
		in[3] = get_lowered_high(right);
	} else {
		in[0] = get_lowered_high(left);
		in[1] = get_lowered_low(left);
		in[2] = get_lowered_high(right);
		in[3] = get_lowered_low(right);
	}
	call    = new_rd_Call(dbgi, block, get_Mod_mem(node), addr, 4, in, mtp);
	resproj = new_r_Proj(call, mode_T, pn_Call_T_result);
640
641
	set_irn_pinned(call, get_irn_pinned(node));

642
643
644
645
646
	foreach_out_edge_safe(node, edge, next) {
		ir_node *proj = get_edge_src_irn(edge);
		if (!is_Proj(proj))
			continue;

647
648
649
650
		switch (get_Proj_proj(proj)) {
		case pn_Mod_M:         /* Memory result. */
			/* reroute to the call */
			set_Proj_pred(proj, call);
651
			set_Proj_proj(proj, pn_Call_M);
652
			break;
653
654
655
656
657
		case pn_Div_X_regular:
			set_Proj_pred(proj, call);
			set_Proj_proj(proj, pn_Call_X_regular);
			break;
		case pn_Mod_X_except:
658
659
660
			set_Proj_pred(proj, call);
			set_Proj_proj(proj, pn_Call_X_except);
			break;
661
662
663
664
665
666
667
668
669
670
		case pn_Mod_res:
			if (env->params->little_endian) {
				ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 0);
				ir_node *res_high = new_r_Proj(resproj, mode,              1);
				ir_set_dw_lowered(proj, res_low, res_high);
			} else {
				ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 1);
				ir_node *res_high = new_r_Proj(resproj, mode,              0);
				ir_set_dw_lowered(proj, res_low, res_high);
			}
671
672
673
			break;
		default:
			assert(0 && "unexpected Proj number");
674
		}
675
676
		/* mark this proj: we have handled it already, otherwise we might fall
		 * into out new nodes. */
677
		mark_irn_visited(proj);
678
679
	}
}
680
681

/**
682
 * Translate a binop.
683
684
685
 *
 * Create an intrinsic Call.
 */
686
static void lower_binop(ir_node *node, ir_mode *mode)
687
{
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
	ir_node  *left  = get_binop_left(node);
	ir_node  *right = get_binop_right(node);
	dbg_info *dbgi  = get_irn_dbg_info(node);
	ir_node  *block = get_nodes_block(node);
	ir_graph *irg   = get_irn_irg(block);
	ir_type  *mtp   = mode_is_signed(mode) ? binop_tp_s : binop_tp_u;
	ir_node  *addr  = get_intrinsic_address(mtp, get_irn_op(node), mode, mode);
	ir_node  *in[4];
	ir_node  *call;
	ir_node  *resproj;

	if (env->params->little_endian) {
		in[0] = get_lowered_low(left);
		in[1] = get_lowered_high(left);
		in[2] = get_lowered_low(right);
		in[3] = get_lowered_high(right);
	} else {
		in[0] = get_lowered_high(left);
		in[1] = get_lowered_low(left);
		in[2] = get_lowered_high(right);
		in[3] = get_lowered_low(right);
	}
	call    = new_rd_Call(dbgi, block, get_irg_no_mem(irg), addr, 4, in, mtp);
	resproj = new_r_Proj(call, mode_T, pn_Call_T_result);
712
	set_irn_pinned(call, get_irn_pinned(node));
713
714
715
716
717
718
719
720
721
722

	if (env->params->little_endian) {
		ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 0);
		ir_node *res_high = new_r_Proj(resproj, mode,              1);
		ir_set_dw_lowered(node, res_low, res_high);
	} else {
		ir_node *res_low  = new_r_Proj(resproj, env->low_unsigned, 1);
		ir_node *res_high = new_r_Proj(resproj, mode,              0);
		ir_set_dw_lowered(node, res_low, res_high);
	}
723
}
724

725
static ir_node *create_conv(ir_node *block, ir_node *node, ir_mode *dest_mode)
726
{
727
728
729
	if (get_irn_mode(node) == dest_mode)
		return node;
	return new_r_Conv(block, node, dest_mode);
730
}
Christian Würdig's avatar
Christian Würdig committed
731

Michael Beck's avatar
Michael Beck committed
732
/**
733
734
 * Moves node and all predecessors of node from from_bl to to_bl.
 * Does not move predecessors of Phi nodes (or block nodes).
Michael Beck's avatar
Michael Beck committed
735
 */
736
static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl)
737
{
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
	int i, arity;

	/* move this node */
	set_nodes_block(node, to_bl);

	/* move its Projs */
	if (get_irn_mode(node) == mode_T) {
		const ir_edge_t *edge;
		foreach_out_edge(node, edge) {
			ir_node *proj = get_edge_src_irn(edge);
			if (!is_Proj(proj))
				continue;
			move(proj, from_bl, to_bl);
		}
	}
Michael Beck's avatar
Michael Beck committed
753

754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
	/* We must not move predecessors of Phi nodes, even if they are in
	 * from_bl. (because these are values from an earlier loop iteration
	 * which are not predecessors of node here)
	 */
	if (is_Phi(node))
		return;

	/* recursion ... */
	arity = get_irn_arity(node);
	for (i = 0; i < arity; i++) {
		ir_node *pred      = get_irn_n(node, i);
		ir_mode *pred_mode = get_irn_mode(pred);
		if (get_nodes_block(pred) == from_bl)
			move(pred, from_bl, to_bl);
		if (pred_mode == env->high_signed || pred_mode == env->high_unsigned) {
			ir_node *pred_low  = get_lowered_low(pred);
			ir_node *pred_high = get_lowered_high(pred);
			if (get_nodes_block(pred_low) == from_bl)
				move(pred_low, from_bl, to_bl);
			if (pred_high != NULL && get_nodes_block(pred_high) == from_bl)
				move(pred_high, from_bl, to_bl);
775
776
777
		}
	}
}
Michael Beck's avatar
Michael Beck committed
778
779

/**
780
781
782
783
784
 * We need a custom version of part_block_edges because during transformation
 * not all data-dependencies are explicit yet if a lowered nodes users are not
 * lowered yet.
 * We can fix this by modifying move to look for such implicit dependencies.
 * Additionally we have to keep the proj_2_block map updated
Michael Beck's avatar
Michael Beck committed
785
 */
786
static ir_node *part_block_dw(ir_node *node)
787
{
788
789
790
791
792
793
794
	ir_graph *irg        = get_irn_irg(node);
	ir_node  *old_block  = get_nodes_block(node);
	int       n_cfgpreds = get_Block_n_cfgpreds(old_block);
	ir_node **cfgpreds   = get_Block_cfgpred_arr(old_block);
	ir_node  *new_block  = new_r_Block(irg, n_cfgpreds, cfgpreds);
	const ir_edge_t *edge;
	const ir_edge_t *next;
795

796
797
798
799
800
801
802
803
804
805
806
807
	/* old_block has no predecessors anymore for now */
	set_irn_in(old_block, 0, NULL);

	/* move node and its predecessors to new_block */
	move(node, old_block, new_block);

	/* move Phi nodes to new_block */
	foreach_out_edge_safe(old_block, edge, next) {
		ir_node *phi = get_edge_src_irn(edge);
		if (!is_Phi(phi))
			continue;
		set_nodes_block(phi, new_block);
808
	}
809
	return old_block;
810
}
Michael Beck's avatar
Michael Beck committed
811

812
813
814
815
816
817
typedef ir_node* (*new_rd_shr_func)(dbg_info *dbgi, ir_node *block,
                                    ir_node *left, ir_node *right,
                                    ir_mode *mode);

static void lower_shr_helper(ir_node *node, ir_mode *mode,
                             new_rd_shr_func new_rd_shrs)
818
{
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
	ir_node  *right         = get_binop_right(node);
	ir_node  *left          = get_binop_left(node);
	ir_mode  *shr_mode      = get_irn_mode(node);
	unsigned  modulo_shift  = get_mode_modulo_shift(shr_mode);
	ir_mode  *low_unsigned  = env->low_unsigned;
	unsigned  modulo_shift2 = get_mode_modulo_shift(mode);
	ir_graph *irg           = get_irn_irg(node);
	ir_node  *left_low      = get_lowered_low(left);
	ir_node  *left_high     = get_lowered_high(left);
	dbg_info *dbgi          = get_irn_dbg_info(node);
	ir_node  *lower_block;
	ir_node  *block;
	ir_node  *cnst;
	ir_node  *and;
	ir_node  *cmp;
	ir_node  *cond;
	ir_node  *proj_true;
	ir_node  *proj_false;
	ir_node  *phi_low;
	ir_node  *phi_high;
	ir_node  *lower_in[2];
	ir_node  *phi_low_in[2];
	ir_node  *phi_high_in[2];

	/* this version is optimized for modulo shift architectures
	 * (and can't handle anything else) */
	if (modulo_shift != get_mode_size_bits(shr_mode)
			|| modulo_shift2<<1 != modulo_shift) {
		panic("Shr lowering only implemented for modulo shift shr operations");
	}
	if (!is_po2(modulo_shift) || !is_po2(modulo_shift2)) {
		panic("Shr lowering only implemented for power-of-2 modes");
	}
	/* without 2-complement the -x instead of (bit_width-x) trick won't work */
	if (get_mode_arithmetic(shr_mode) != irma_twos_complement) {
		panic("Shr lowering only implemented for two-complement modes");
	}

857
858
	block = get_nodes_block(node);

859
860
861
862
863
864
	/* if the right operand is a 64bit value, we're only interested in the
	 * lower word */
	if (get_irn_mode(right) == env->high_unsigned) {
		right = get_lowered_low(right);
	} else {
		/* shift should never have signed mode on the right */
Michael Beck's avatar
Michael Beck committed
865
		assert(get_irn_mode(right) != env->high_signed);
866
867
		right = create_conv(block, right, low_unsigned);
	}
Michael Beck's avatar
Michael Beck committed
868

869
870
871
872
	lower_block = part_block_dw(node);
	env->flags |= CF_CHANGED;
	block = get_nodes_block(node);

Michael Beck's avatar
Michael Beck committed
873
	/* add a Cmp to test if highest bit is set <=> whether we shift more
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
	 * than half the word width */
	cnst       = new_r_Const_long(irg, low_unsigned, modulo_shift2);
	and        = new_r_And(block, right, cnst, low_unsigned);
	cnst       = new_r_Const(irg, get_mode_null(low_unsigned));
	cmp        = new_rd_Cmp(dbgi, block, and, cnst, ir_relation_equal);
	cond       = new_rd_Cond(dbgi, block, cmp);
	proj_true  = new_r_Proj(cond, mode_X, pn_Cond_true);
	proj_false = new_r_Proj(cond, mode_X, pn_Cond_false);

	/* the true block => shift_width < 1word */
	{
		/* In theory the low value (for 64bit shifts) is:
		 *    Or(High << (32-x)), Low >> x)
		 * In practice High << 32-x will fail when x is zero (since we have
		 * modulo shift and 32 will be 0). So instead we use:
		 *    Or(High<<1<<~x, Low >> x)
		 */
		ir_node *in[1]        = { proj_true };
		ir_node *block_true   = new_r_Block(irg, ARRAY_SIZE(in), in);
		ir_node *res_high     = new_rd_shrs(dbgi, block_true, left_high,
		                                    right, mode);
		ir_node *shift_low    = new_rd_Shr(dbgi, block_true, left_low, right,
		                                   low_unsigned);
		ir_node *not_shiftval = new_rd_Not(dbgi, block_true, right,
		                                   low_unsigned);
		ir_node *conv         = create_conv(block_true, left_high,
		                                    low_unsigned);
		ir_node *one          = new_r_Const(irg, get_mode_one(low_unsigned));
		ir_node *carry0       = new_rd_Shl(dbgi, block_true, conv, one,
		                                   low_unsigned);
		ir_node *carry1       = new_rd_Shl(dbgi, block_true, carry0,
		                                   not_shiftval, low_unsigned);
		ir_node *res_low      = new_rd_Or(dbgi, block_true, shift_low, carry1,
		                                  low_unsigned);
		lower_in[0]           = new_r_Jmp(block_true);
		phi_low_in[0]         = res_low;
		phi_high_in[0]        = res_high;
	}

	/* false block => shift_width > 1word */
	{
		ir_node *in[1]       = { proj_false };
		ir_node *block_false = new_r_Block(irg, ARRAY_SIZE(in), in);
		ir_node *conv        = create_conv(block_false, left_high, low_unsigned);
		ir_node *res_low     = new_rd_shrs(dbgi, block_false, conv, right,
		                                   low_unsigned);
		int      cnsti       = modulo_shift2-1;
921
		ir_node *cnst2       = new_r_Const_long(irg, low_unsigned, cnsti);
922
923
		ir_node *res_high;
		if (new_rd_shrs == new_rd_Shrs) {
924
			res_high = new_rd_shrs(dbgi, block_false, left_high, cnst2, mode);
925
926
		} else {
			res_high = new_r_Const(irg, get_mode_null(mode));
927
		}
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
		lower_in[1]          = new_r_Jmp(block_false);
		phi_low_in[1]        = res_low;
		phi_high_in[1]       = res_high;
	}

	/* patch lower block */
	set_irn_in(lower_block, ARRAY_SIZE(lower_in), lower_in);
	phi_low  = new_r_Phi(lower_block, ARRAY_SIZE(phi_low_in), phi_low_in,
	                     low_unsigned);
	phi_high = new_r_Phi(lower_block, ARRAY_SIZE(phi_high_in), phi_high_in,
	                     mode);
	ir_set_dw_lowered(node, phi_low, phi_high);
}

static void lower_Shr(ir_node *node, ir_mode *mode)
{
	lower_shr_helper(node, mode, new_rd_Shr);
}

static void lower_Shrs(ir_node *node, ir_mode *mode)
{
	lower_shr_helper(node, mode, new_rd_Shrs);
}

static void lower_Shl(ir_node *node, ir_mode *mode)
{
	ir_node  *right         = get_binop_right(node);
	ir_node  *left          = get_binop_left(node);
	ir_mode  *shr_mode      = get_irn_mode(node);
	unsigned  modulo_shift  = get_mode_modulo_shift(shr_mode);
	ir_mode  *low_unsigned  = env->low_unsigned;
	unsigned  modulo_shift2 = get_mode_modulo_shift(mode);
	ir_graph *irg           = get_irn_irg(node);
	ir_node  *left_low      = get_lowered_low(left);
	ir_node  *left_high     = get_lowered_high(left);
	dbg_info *dbgi          = get_irn_dbg_info(node);
	ir_node  *lower_block   = get_nodes_block(node);
	ir_node  *block;
	ir_node  *cnst;
	ir_node  *and;
	ir_node  *cmp;
	ir_node  *cond;
	ir_node  *proj_true;
	ir_node  *proj_false;
	ir_node  *phi_low;
	ir_node  *phi_high;
	ir_node  *lower_in[2];
	ir_node  *phi_low_in[2];
	ir_node  *phi_high_in[2];

	/* this version is optimized for modulo shift architectures
	 * (and can't handle anything else) */
	if (modulo_shift != get_mode_size_bits(shr_mode)
			|| modulo_shift2<<1 != modulo_shift) {
yb9976's avatar
yb9976 committed
982
		panic("Shl lowering only implemented for modulo shift shl operations");
983
984
	}
	if (!is_po2(modulo_shift) || !is_po2(modulo_shift2)) {
yb9976's avatar
yb9976 committed
985
		panic("Shl lowering only implemented for power-of-2 modes");
986
987
988
	}
	/* without 2-complement the -x instead of (bit_width-x) trick won't work */
	if (get_mode_arithmetic(shr_mode) != irma_twos_complement) {
yb9976's avatar
yb9976 committed
989
		panic("Shl lowering only implemented for two-complement modes");
990
991
992
993
994
995
996
997
998
999
	}

	/* if the right operand is a 64bit value, we're only interested in the
	 * lower word */
	if (get_irn_mode(right) == env->high_unsigned) {
		right = get_lowered_low(right);
	} else {
		/* shift should never have signed mode on the right */
		assert(get_irn_mode(right) != env->high_signed);
		right = create_conv(lower_block, right, low_unsigned);
1000
	}
For faster browsing, not all history is shown. View entire blame