irprofile.c 18.4 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
/*
Michael Beck's avatar
Michael Beck committed
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.
 */

Christian Würdig's avatar
Christian Würdig committed
20
21
22
/**
 * @file
 * @brief       Code instrumentation and execution count profiling.
23
24
 * @author      Adam M. Szalkowski, Steven Schaefer
 * @date        06.04.2006, 11.11.2010
Christian Würdig's avatar
Christian Würdig committed
25
 * @version     $Id$
26
27
28
29
 */
#include "config.h"

#include <math.h>
30
#include <stdio.h>
31
32
33
34

#include "hashptr.h"
#include "debug.h"
#include "obst.h"
35
#include "xmalloc.h"
36
#include "set.h"
37
#include "irtools.h"
38
39
40
41
42
43

#include "irgwalk.h"
#include "irdump_t.h"
#include "irnode_t.h"
#include "ircons_t.h"
#include "execfreq.h"
44
#include "typerep.h"
45

Michael Beck's avatar
Michael Beck committed
46
#include "irprofile.h"
47

48
/* Instrument blocks walker. */
49
typedef struct block_id_walker_data_t {
50
51
	unsigned int id;   /**< current block id number */
	ir_node *symconst; /**< the SymConst representing the counter array */
52
53
} block_id_walker_data_t;

54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
/* Associate counters with blocks. */
typedef struct block_assoc_t {
	unsigned int i;          /**< current block id number */
	unsigned int *counters;  /**< block execution counts */
} block_assoc_t;

typedef struct intialize_execfreq_env_t {
	ir_graph *irg;
	ir_exec_freq *execfreqs;
	double freq_factor;
} initialize_execfreq_env_t;

/* minimal execution frequency (an execfreq of 0 confuses algos) */
#define MIN_EXECFREQ 0.00001

/* keep the execcounts here because they are only read once per compiler run */
static set *profile = NULL;

/* Hook for vcg output. */
73
static void *hook;
74
75
76
77
78
79
80
81

/* The debug module handle. */
DEBUG_ONLY(static firm_dbg_module_t *dbg;)

/* Since the backend creates a new firm graph we cannot associate counts with
 * blocks directly. Instead we associate them with the block ids, which are
 * maintained.
 */
82
typedef struct execcount_t {
83
84
	unsigned long block; /**< block id */
	unsigned int  count; /**< execution count */
85
86
} execcount_t;

Michael Beck's avatar
Michael Beck committed
87
88
89
/**
 * Compare two execcount_t entries.
 */
90
91
static int cmp_execcount(const void *a, const void *b, size_t size)
{
92
93
	const execcount_t *ea = (const execcount_t*)a;
	const execcount_t *eb = (const execcount_t*)b;
94
	(void) size;
Michael Beck's avatar
Michael Beck committed
95
	return ea->block != eb->block;
96
}
97

Michael Beck's avatar
Michael Beck committed
98
99
100
/**
 * Block walker, count number of blocks.
 */
101
static void block_counter(ir_node *bb, void *data)
102
{
103
	unsigned *count = (unsigned*) data;
Michael Beck's avatar
Michael Beck committed
104
105
	(void) bb;
	++(*count);
106
107
}

Michael Beck's avatar
Michael Beck committed
108
/**
109
 * Returns the number of blocks the given graph.
Michael Beck's avatar
Michael Beck committed
110
 */
111
static unsigned int get_irg_n_blocks(ir_graph *irg)
112
{
113
114
115
116
117
118
	unsigned int count = 0;
	irg_block_walk_graph(irg, block_counter, NULL, &count);
	return count;
}

/**
119
 * Returns the number of basic blocks in the current ir program.
120
 */
121
static unsigned int get_irp_n_blocks(void)
122
{
123
124
	int i, n = get_irp_n_irgs();
	unsigned int count = 0;
Matthias Braun's avatar
fixes    
Matthias Braun committed
125

126
127
128
129
	for (i = 0; i < n; i++) {
		ir_graph *irg = get_irp_irg(i);
		count += get_irg_n_blocks(irg);
	}
Matthias Braun's avatar
fixes    
Matthias Braun committed
130

131
	return count;
132
133
}

134
135
/* vcg helper */
static void dump_profile_node_info(void *ctx, FILE *f, const ir_node *irn)
136
{
137
138
139
140
	(void) ctx;
	if (is_Block(irn)) {
		unsigned int execcount = ir_profile_get_block_execcount(irn);
		fprintf(f, "profiled execution count: %u\n", execcount);
141
142
143
	}
}

144
145
146
/**
 * Add the given method entity as a constructor.
 */
147
148
149
static void add_constructor(ir_entity *method)
{
    ir_type   *method_type  = get_entity_type(method);
150
    ir_type   *ptr_type     = new_type_pointer(method_type);
151

152
    ir_type   *constructors = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
153
154
155
156
157
158
159
160
	/* Mach-O does not like labels in the constructor segment, but with ELF
	 * the linker dies horribly if there is no label. */
	ident     *ide = id_unique("constructor_ptr.%u");
    ir_entity *ptr = new_entity(constructors, ide, ptr_type);
    ir_graph  *irg = get_const_code_irg();
    ir_node   *val = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code, method);

	set_entity_ld_ident(ptr, new_id_from_chars("", 0));
161
    set_entity_compiler_generated(ptr, 1);
162
163
    set_entity_linkage(ptr, IR_LINKAGE_CONSTANT | IR_LINKAGE_HIDDEN_USER);
    set_entity_visibility(ptr, ir_visibility_private);
164
165
    set_atomic_ent_value(ptr, val);
}
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
/**
 * Returns an entity representing the __init_firmprof function from libfirmprof
 * This is the equivalent of:
 * extern void __init_firmprof(char *filename, uint *counters, uint size)
 */
static ir_entity *get_init_firmprof_ref(void)
{
	ident   *init_name = new_id_from_str("__init_firmprof");
	ir_type *init_type = new_type_method(3, 0);
	ir_type *uint      = new_type_primitive(mode_Iu);
	ir_type *uintptr   = new_type_pointer(uint);
	ir_type *string    = new_type_pointer(new_type_primitive(mode_Bs));
	ir_entity *result;

	set_method_param_type(init_type, 0, string);
	set_method_param_type(init_type, 1, uintptr);
	set_method_param_type(init_type, 2, uint);

	result = new_entity(get_glob_type(), init_name, init_type);
	set_entity_visibility(result, ir_visibility_external);

	return result;
}

191
192
/**
 * Generates a new irg which calls the initializer
Michael Beck's avatar
BugFix:    
Michael Beck committed
193
194
 *
 * Pseudocode:
195
196
197
198
 *    static void __firmprof_initializer(void) __attribute__ ((constructor))
 *    {
 *        __init_firmprof(ent_filename, bblock_counts, n_blocks);
 *    }
199
 */
200
201
static ir_graph *gen_initializer_irg(ir_entity *ent_filename,
                                     ir_entity *bblock_counts, int n_blocks)
202
{
203
204
205
206
	ir_graph *irg;
	ir_node  *ins[3];
	ir_node  *bb, *ret, *call, *symconst;
	ir_type  *empty_frame_type;
Adam Szalkowski's avatar
Adam Szalkowski committed
207
	symconst_symbol sym;
208

209
	ir_entity *init_ent = get_init_firmprof_ref();
Adam Szalkowski's avatar
Adam Szalkowski committed
210

211
212
213
	ident     *name = new_id_from_str("__firmprof_initializer");
	ir_entity *ent  = new_entity(get_glob_type(), name, new_type_method(0, 0));
	set_entity_visibility(ent, ir_visibility_local);
Christian Würdig's avatar
Christian Würdig committed
214
215
	set_entity_ld_ident(ent, name);

216
	/* create the new ir_graph */
Christian Würdig's avatar
Christian Würdig committed
217
	irg = new_ir_graph(ent, 0);
218
	set_current_ir_graph(irg);
Christian Würdig's avatar
Christian Würdig committed
219
220
	empty_frame_type = get_irg_frame_type(irg);
	set_type_size_bytes(empty_frame_type, 0);
221
	set_type_state(empty_frame_type, layout_fixed);
222

223
	bb = get_r_cur_block(irg);
Adam Szalkowski's avatar
Adam Szalkowski committed
224
225

	sym.entity_p = init_ent;
226
	symconst     = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
Adam Szalkowski's avatar
Adam Szalkowski committed
227

228
	sym.entity_p = ent_filename;
229
	ins[0] = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
230
	sym.entity_p = bblock_counts;
231
232
	ins[1] = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
	ins[2] = new_r_Const_long(irg, mode_Iu, n_blocks);
233

234
235
236
	call = new_r_Call(bb, get_irg_initial_mem(irg), symconst, 3, ins,
	        get_entity_type(init_ent));
	ret  = new_r_Return(bb, new_r_Proj(call, mode_M, pn_Call_M), 0, NULL);
237
238
239
240
241
	mature_immBlock(bb);

	add_immBlock_pred(get_irg_end_block(irg), ret);
	mature_immBlock(get_irg_end_block(irg));

Matthias Braun's avatar
fixes    
Matthias Braun committed
242
243
	irg_finalize_cons(irg);

244
	/* add a pointer to the new function in the constructor section */
245
246
	add_constructor(ent);

247
248
249
	return irg;
}

250
/**
251
252
253
 * Instrument a block with code needed for profiling.
 * This just inserts the instruction nodes, it doesn't connect the memory
 * nodes in a meaningful way.
254
 */
255
static void instrument_block(ir_node *bb, ir_node *address, unsigned int id)
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
	ir_graph *irg = get_irn_irg(bb);
	ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown, *cnst;

	/* We can't instrument the end block */
	if (bb == get_irg_end_block(irg))
		return;

	unknown = new_r_Unknown(irg, mode_M);
	cnst    = new_r_Const_long(irg, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
	offset  = new_r_Add(bb, address, cnst, get_modeP_data());
	load    = new_r_Load(bb, unknown, offset, mode_Iu, cons_none);
	projm   = new_r_Proj(load, mode_M, pn_Load_M);
	proji   = new_r_Proj(load, mode_Iu, pn_Load_res);
	cnst    = new_r_Const_long(irg, mode_Iu, 1);
	add     = new_r_Add(bb, proji, cnst, mode_Iu);
	store   = new_r_Store(bb, projm, offset, add, cons_none);
	projm   = new_r_Proj(store, mode_M, pn_Store_M);

	set_irn_link(bb, projm);
	set_irn_link(projm, load);
}

/**
 * SSA Construction for instrumentation code memory.
 *
 * This introduces a new memory node and connects it to the instrumentation
 * codes, inserting phiM nodes as necessary. Note that afterwards, the new
 * memory is not connected to any return nodes and thus still dead.
 */
static void fix_ssa(ir_node *bb, void *data)
{
	ir_graph *irg = get_irn_irg(bb);
	ir_node *mem, *proj, *load;
	int n, arity = get_Block_n_cfgpreds(bb);

	(void) data;

	/* end blocks are not instrumented, skip! */
	if (bb == get_irg_end_block(irg))
		return;

	if (bb == get_irg_start_block(irg)) {
		mem = get_irg_initial_mem(irg);
	} else if (arity == 1) {
		ir_node *pred = get_Block_cfgpred_block(bb, 0);
		if (!is_Bad(pred))
			mem = (ir_node*) get_irn_link(pred);
		else
			mem = new_r_NoMem(irg);
306
	} else {
307
308
309
310
311
312
313
314
315
		ir_node **ins = ALLOCAN(ir_node*, arity);
		for (n = arity - 1; n >= 0; --n) {
			ir_node *pred = get_Block_cfgpred_block(bb, n);
			if (!is_Bad(pred))
				ins[n] = (ir_node*) get_irn_link(pred);
			else
				ins[n] = new_r_NoMem(irg);
		}
		mem = new_r_Phi(bb, arity, ins, mode_M);
316
	}
317
318
319
320
321
322
323

	/* The block link fields point to the projm from the instrumentation code,
	 * the projm in turn links to the initial load which lacks a memory
	 * argument at this point. */
	proj = (ir_node*) get_irn_link(bb);
	load = (ir_node*) get_irn_link(proj);
	set_Load_mem(load, mem);
324
325
326
}

/**
327
 * Instrument a single block.
328
 */
329
static void block_instrument_walker(ir_node *bb, void *data)
330
{
331
	block_id_walker_data_t *wd = (block_id_walker_data_t*)data;
332
333
334
335
	instrument_block(bb, wd->symconst, wd->id);
	++wd->id;
}

336
337
338
339
340
341
342
343
344
345
346
/**
 * Synchronize the original memory input of node with the additional operand
 * from the profiling code.
 */
static ir_node *sync_mem(ir_node *bb, ir_node *mem)
{
	ir_node *ins[2];
	ins[0] = (ir_node*) get_irn_link(bb);
	ins[1] = mem;
	return new_r_Sync(bb, 2, ins);
}
347

348
349
350
351
352
353
/**
 * Instrument a single ir_graph, counters should point to the bblock
 * counters array.
 */
static void instrument_irg(ir_graph *irg, ir_entity *counters,
                           block_id_walker_data_t *wd)
354
{
355
356
357
	ir_node *end   = get_irg_end(irg);
	ir_node *endbb = get_irg_end_block(irg);
	int i;
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
	/* generate a symbolic constant pointing to the count array */
	symconst_symbol sym;
	sym.entity_p = counters;
	wd->symconst = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);

	/* instrument each block in the current irg */
	irg_block_walk_graph(irg, block_instrument_walker, NULL, wd);
	irg_block_walk_graph(irg, fix_ssa, NULL, NULL);

	/* connect the new memory nodes to the return nodes */
	for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
		ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
		ir_node *bb   = get_Block_cfgpred_block(endbb, i);
		ir_node *mem;

		switch (get_irn_opcode(node)) {
		case iro_Return:
			mem = get_Return_mem(node);
			set_Return_mem(node, sync_mem(bb, mem));
			break;
		case iro_Raise:
			mem = get_Raise_mem(node);
			set_Raise_mem(node, sync_mem(bb, mem));
			break;
		case iro_Bad:
			break;
		default:
			/* A fragile's op exception. There should be another path to End,
			 * so ignore it.
			 */
			assert(is_fragile_op(node) && \
				"unexpected End control flow predecessor");
		}
	}
393

394
395
396
397
398
399
400
401
	/* as well as calls with attribute noreturn */
	for (i = get_End_n_keepalives(end) - 1; i >= 0; --i) {
		ir_node *node = get_End_keepalive(end, i);
		if (is_Call(node)) {
			ir_node *bb  = get_nodes_block(node);
			ir_node *mem = get_Call_mem(node);
			set_Call_mem(node, sync_mem(bb, mem));
		}
402
	}
403
}
404

405
406
407
408
409
410
411
412
413
414
/**
 * Creates a new entity representing the equivalent of
 * static unsigned int name[size]
 */
static ir_entity *new_array_entity(ident *name, int size)
{
	ir_entity *result;
	ir_type *uint_type, *array_type;

	uint_type = new_type_primitive(mode_Iu);
415
	set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
416

417
418
419
	array_type = new_type_array(1, uint_type);
	set_array_bounds_int(array_type, 0, 0, size);
	set_type_size_bytes(array_type, size * get_mode_size_bytes(mode_Iu));
420
421
	set_type_alignment_bytes(array_type, get_mode_size_bytes(mode_Iu));
	set_type_state(array_type, layout_fixed);
Christian Würdig's avatar
Christian Würdig committed
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
	result = new_entity(get_glob_type(), name, array_type);
	set_entity_visibility(result, ir_visibility_local);
	set_entity_compiler_generated(result, 1);

	return result;
}

/**
 * Creates a new entity representing the equivalent of
 * static const char name[strlen(string)+1] = string
 */
static ir_entity *new_static_string_entity(ident *name, const char *string)
{
	ir_entity *result;

	ir_type *char_type   = new_type_primitive(mode_Bs);
	ir_type *string_type = new_type_array(1, char_type);

	ir_initializer_t *contents;

	size_t i, length = strlen(string)+1;

	/* Create the type for a fixed-length string */
	set_array_bounds_int(string_type, 0, 0, length);
	set_type_size_bytes(string_type, length);
448
449
	set_type_alignment_bytes(string_type, 1);
	set_type_state(string_type, layout_fixed);
Christian Würdig's avatar
Christian Würdig committed
450

451
452
453
454
455
456
457
458
459
460
461
462
	result = new_entity(get_glob_type(), name, string_type);
	set_entity_visibility(result, ir_visibility_local);
	set_entity_linkage(result, IR_LINKAGE_CONSTANT);
	set_entity_compiler_generated(result, 1);

	/* There seems to be no simpler way to do this. Or at least, cparser
	 * does exactly the same thing... */
	contents = create_initializer_compound(length);
	for (i = 0; i < length; i++) {
		ir_tarval *c = new_tarval_from_long(string[i], mode_Bs);
		ir_initializer_t *init = create_initializer_tarval(c);
		set_initializer_compound_value(contents, i, init);
463
	}
464
	set_entity_initializer(result, contents);
465

466
467
	return result;
}
468

469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/**
 * Instrument all ir_graphs in the current ir_program. Currently this only
 * works for graphs in the backend. Additionally, the resulting program
 * has to be linked with libfirmprof.
 *
 * @param filename the name of the profile file (usually module_name.prof)
 * @returns the module initializer, may be NULL
 */
ir_graph *ir_profile_instrument(const char *filename)
{
	int n, n_blocks = 0;
	ident *counter_id, *filename_id;
	ir_entity *bblock_counts, *ent_filename;
	block_id_walker_data_t wd;
	FIRM_DBG_REGISTER(dbg, "firm.ir.profile");
484

485
486
487
488
	/* Don't do anything for modules without code. Else the linker will
	 * complain. */
	if (get_irp_n_irgs() == 0)
		return NULL;
489

490
491
492
493
494
495
496
497
498
499
500
501
502
503
	/* count the number of block first */
	n_blocks = get_irp_n_blocks();

	/* create all the necessary types and entities. Note that the
	 * types must have a fixed layout, because we are already running in the
	 * backend */
	counter_id    = new_id_from_str("__FIRMPROF__BLOCK_COUNTS");
	bblock_counts = new_array_entity(counter_id, n_blocks);

	filename_id  = new_id_from_str("__FIRMPROF__FILE_NAME");
	ent_filename = new_static_string_entity(filename_id, filename);

	/* initialize block id array and instrument blocks */
	wd.id  = 0;
Christian Würdig's avatar
Christian Würdig committed
504
	for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
505
506
		ir_graph *irg = get_irp_irg(n);
		instrument_irg(irg, bblock_counts, &wd);
507
	}
508
509

	return gen_initializer_irg(ent_filename, bblock_counts, n_blocks);
510
511
}

512
513
static unsigned int *
parse_profile(const char *filename, unsigned int num_blocks)
514
{
515
516
517
518
519
520
521
522
	unsigned int *result = NULL;
	char buf[8];
	size_t ret;

	FILE *f = fopen(filename, "rb");
	if (!f) {
		DBG((dbg, LEVEL_2, "Failed to open profile file (%s)\n", filename));
		return NULL;
523
524
	}

525
526
527
528
529
530
	/* check header */
	ret = fread(buf, 8, 1, f);
	if (ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
		DBG((dbg, LEVEL_2, "Broken fileheader in profile\n"));
		goto end;
	}
531

532
533
534
535
536
537
538
539
540
541
542
	result = XMALLOCN(unsigned int, num_blocks);
	if (fread(result, sizeof(unsigned int) * num_blocks, 1, f) < 1) {
		DBG((dbg, LEVEL_4, "Failed to read counters... (size: %u)\n",
		    sizeof(unsigned int) * num_blocks));
		xfree(result);
		result = NULL;
	}

end:
	fclose(f);
	return result;
543
}
544

545
/**
546
 * Reads the corresponding profile info file if it exists.
547
548
 */

549
550
551
552
553
554
555
556
557
558
559
static void block_associate_walker(ir_node *bb, void *env)
{
	block_assoc_t *b = (block_assoc_t*) env;
	execcount_t query;

	query.block = get_irn_node_nr(bb);
	query.count = b->counters[(b->i)++];
	DBG((dbg, LEVEL_4, "execcount(%+F, %u): %u\n", bb, query.block,
	    query.count));
	set_insert(profile, &query, sizeof(query), query.block);
}
560

561
562
563
564
565
566
static void irp_associate_blocks(block_assoc_t *env)
{
	int n;
	for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
		ir_graph *irg = get_irp_irg(n);
		irg_block_walk_graph(irg, block_associate_walker, NULL, env);
567
	}
568
}
569

570
571
572
573
bool ir_profile_read(const char *filename)
{
	block_assoc_t env;
	FIRM_DBG_REGISTER(dbg, "firm.ir.profile");
574

575
576
577
578
	env.i = 0;
	env.counters = parse_profile(filename, get_irp_n_blocks());
	if (!env.counters)
		return false;
579

580
581
582
	if (profile)
		ir_profile_free();
	profile = new_set(cmp_execcount, 16);
583

584
585
	irp_associate_blocks(&env);
	xfree(env.counters);
Adam Szalkowski's avatar
Adam Szalkowski committed
586

587
588
589
	/* register the vcg hook */
	hook = dump_add_node_info_callback(dump_profile_node_info, NULL);
	return true;
590
591
592
593
594
}

/**
 * Frees the profile info
 */
595
void ir_profile_free(void)
596
{
597
	if (profile) {
598
		del_set(profile);
599
600
601
602
603
604
		profile = NULL;
	}

	if (hook != NULL) {
		dump_remove_node_info_callback(hook);
		hook = NULL;
605
	}
606
607
}

Adam Szalkowski's avatar
Adam Szalkowski committed
608
/**
Michael Beck's avatar
BugFix:    
Michael Beck committed
609
 * Tells whether profile module has acquired data
Adam Szalkowski's avatar
Adam Szalkowski committed
610
 */
611
bool ir_profile_has_data(void)
Adam Szalkowski's avatar
Adam Szalkowski committed
612
{
613
	return profile != NULL;
Adam Szalkowski's avatar
Adam Szalkowski committed
614
615
}

616
/**
617
 * Get block execution count as determined by profiling
618
 */
619
unsigned int ir_profile_get_block_execcount(const ir_node *block)
620
621
622
{
	execcount_t *ec, query;

623
	if (!ir_profile_has_data())
624
625
626
		return 1;

	query.block = get_irn_node_nr(block);
627
	ec = (execcount_t*)set_find(profile, &query, sizeof(query), query.block);
628

629
	if (ec != NULL) {
630
631
		return ec->count;
	} else {
632
633
		DBG((dbg, LEVEL_3,
			"Warning: Profile contains no data for %+F\n", block));
634
635
		return 1;
	}
636
}
637

638
639
static void initialize_execfreq(ir_node *block, void *data)
{
640
	initialize_execfreq_env_t *env = (initialize_execfreq_env_t*)data;
641
642
	double freq;

643
	if (block == get_irg_start_block(env->irg)
644
645
646
	   || block == get_irg_end_block(env->irg)) {
		freq = 1.0;
	} else {
Michael Beck's avatar
Michael Beck committed
647
		freq = ir_profile_get_block_execcount(block);
648
		freq *= env->freq_factor;
649
		if (freq < MIN_EXECFREQ)
650
			freq = MIN_EXECFREQ;
651
652
653
654
655
	}

	set_execfreq(env->execfreqs, block, freq);
}

Michael Beck's avatar
Michael Beck committed
656
ir_exec_freq *ir_create_execfreqs_from_profile(ir_graph *irg)
657
658
659
660
661
{
	ir_node *start_block;
	initialize_execfreq_env_t env;
	unsigned count;

662
	env.irg = irg;
663
664
	env.execfreqs = create_execfreq(irg);

665
666
	/* Find the first block containing instructions */
	start_block = get_irg_start_block(irg);
Michael Beck's avatar
Michael Beck committed
667
	count = ir_profile_get_block_execcount(start_block);
668
	if (count == 0) {
669
		/* the function was never executed, so fallback to estimated freqs */
670
671
672
673
		free_execfreq(env.execfreqs);
		return compute_execfreq(irg, 10);
	}

674
	env.freq_factor = 1.0 / count;
675
676
677
678
	irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);

	return env.execfreqs;
}