ia32_emitter.c 24.8 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
2
3
4
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

Christian Würdig's avatar
Christian Würdig committed
5
6
#include <limits.h>

7
#include "xmalloc.h"
8
9
#include "tv.h"
#include "iredges.h"
Christian Würdig's avatar
Christian Würdig committed
10
11
12
13
#include "debug.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "irop_t.h"
Christian Würdig's avatar
Christian Würdig committed
14
#include "irargs_t.h"
15
#include "irprog_t.h"
Christian Würdig's avatar
Christian Würdig committed
16
17
18

#include "../besched.h"

19
#include "ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
20
#include "gen_ia32_emitter.h"
21
22
#include "ia32_nodes_attr.h"
#include "ia32_new_nodes.h"
Christian Würdig's avatar
Christian Würdig committed
23
24
#include "ia32_map_regs.h"

Christian Würdig's avatar
Christian Würdig committed
25
26
27
28
29
30
31
32
#ifdef obstack_chunk_alloc
# undef obstack_chunk_alloc
# define obstack_chunk_alloc xmalloc
#else
# define obstack_chunk_alloc xmalloc
# define obstack_chunk_free free
#endif

33
34
extern int obstack_printf(struct obstack *obst, char *fmt, ...);

Christian Würdig's avatar
Christian Würdig committed
35
36
#define SNPRINTF_BUF_LEN 128

Christian Würdig's avatar
Christian Würdig committed
37
static const arch_env_t *arch_env = NULL;
38

Christian Würdig's avatar
Christian Würdig committed
39
40
41
/**
 * Emits registers and/or address mode of a binary operation.
 */
Christian Würdig's avatar
Christian Würdig committed
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
char *ia32_emit_binop(const ir_node *n) {
	static char *buf = NULL;

	if (! buf) {
		buf = xcalloc(1, SNPRINTF_BUF_LEN);
	}
	else {
		memset(buf, 0, SNPRINTF_BUF_LEN);
	}

	switch(get_ia32_op_type(n)) {
		case ia32_Normal:
			if (get_ia32_cnst(n)) {
				lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D, %s", n, get_ia32_cnst(n));
			}
			else {
				lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D, %4S", n, n);
			}
			break;
		case ia32_am_Source:
			lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D, %s", n, ia32_emit_am(n));
			break;
		case ia32_am_Dest:
			lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%s, %4S", ia32_emit_am(n), n);
			break;
		default:
			assert(0 && "unsupported op type");
	}

	return buf;
72
73
}

Christian Würdig's avatar
Christian Würdig committed
74
75
76
/**
 * Emits registers and/or address mode of a unary operation.
 */
Christian Würdig's avatar
Christian Würdig committed
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
char *ia32_emit_unop(const ir_node *n) {
	static char *buf = NULL;

	if (! buf) {
		buf = xcalloc(1, SNPRINTF_BUF_LEN);
	}
	else {
		memset(buf, 0, SNPRINTF_BUF_LEN);
	}

	switch(get_ia32_op_type(n)) {
		case ia32_Normal:
			lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D", n);
			break;
		case ia32_am_Dest:
			snprintf(buf, SNPRINTF_BUF_LEN, ia32_emit_am(n));
			break;
		default:
			assert(0 && "unsupported op type");
	}

	return buf;
99
100
}

Christian Würdig's avatar
Christian Würdig committed
101
102
103
/**
 * Emits adressmode.
 */
Christian Würdig's avatar
Christian Würdig committed
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
char *ia32_emit_am(const ir_node *n) {
	ia32_am_flavour_t am_flav    = get_ia32_am_flavour(n);
	int               had_output = 0;
	char             *s;
	int               size;
	static struct obstack *obst  = NULL;

	if (! obst) {
		obst = xcalloc(1, sizeof(*obst));
	}
	else {
		obstack_free(obst, NULL);
	}

	/* obstack_free with NULL results in an uninitialized obstack */
	obstack_init(obst);

	obstack_printf(obst, "[");

	if (am_flav & ia32_B) {
		lc_eoprintf(ia32_get_arg_env(), obst, "%1S", n);
		had_output = 1;
	}

	if (am_flav & ia32_I) {
		if (had_output) {
			obstack_printf(obst, "+");
		}

		lc_eoprintf(ia32_get_arg_env(), obst, "%2S", n);

		if (am_flav & ia32_S) {
Christian Würdig's avatar
Christian Würdig committed
136
			obstack_printf(obst, "*%d", 1 << get_ia32_am_scale(n));
Christian Würdig's avatar
Christian Würdig committed
137
138
139
140
141
142
		}

		had_output = 1;
	}

	if (am_flav & ia32_O) {
143
		obstack_printf(obst, get_ia32_am_offs(n));
Christian Würdig's avatar
Christian Würdig committed
144
145
146
147
148
149
150
151
152
	}

	obstack_printf(obst, "] ");

	size        = obstack_object_size(obst);
	s           = obstack_finish(obst);
	s[size - 1] = '\0';

	return s;
153
}
154

Christian Würdig's avatar
Christian Würdig committed
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*************************************************************
 *             _       _    __   _          _
 *            (_)     | |  / _| | |        | |
 *  _ __  _ __ _ _ __ | |_| |_  | |__   ___| |_ __   ___ _ __
 * | '_ \| '__| | '_ \| __|  _| | '_ \ / _ \ | '_ \ / _ \ '__|
 * | |_) | |  | | | | | |_| |   | | | |  __/ | |_) |  __/ |
 * | .__/|_|  |_|_| |_|\__|_|   |_| |_|\___|_| .__/ \___|_|
 * | |                                       | |
 * |_|                                       |_|
 *************************************************************/

/* We always pass the ir_node which is a pointer. */
static int ia32_get_arg_type(const lc_arg_occ_t *occ) {
	return lc_arg_type_ptr;
169
170
}

Christian Würdig's avatar
Christian Würdig committed
171
172

/**
Christian Würdig's avatar
Christian Würdig committed
173
 * Returns the register at in position pos.
Christian Würdig's avatar
Christian Würdig committed
174
175
176
177
178
179
180
181
182
183
184
 */
static const arch_register_t *get_in_reg(ir_node *irn, int pos) {
	ir_node                *op;
	const arch_register_t  *reg = NULL;

	assert(get_irn_arity(irn) > pos && "Invalid IN position");

	/* The out register of the operator at position pos is the
	   in register we need. */
	op = get_irn_n(irn, pos);

Christian Würdig's avatar
Christian Würdig committed
185
	reg = arch_get_irn_register(arch_env, op);
Christian Würdig's avatar
Christian Würdig committed
186

Christian Würdig's avatar
Christian Würdig committed
187
188
189
190
191
192
193
194
195
196
197
198
	assert(reg && "no in register found");
	return reg;
}

/**
 * Returns the register at out position pos.
 */
static const arch_register_t *get_out_reg(ir_node *irn, int pos) {
	ir_node                *proj;
	const arch_register_t  *reg = NULL;

	assert(get_irn_n_edges(irn) > pos && "Invalid OUT position");
Christian Würdig's avatar
Christian Würdig committed
199

Christian Würdig's avatar
Christian Würdig committed
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
	/* 1st case: irn is not of mode_T, so it has only                 */
	/*           one OUT register -> good                             */
	/* 2nd case: irn is of mode_T -> collect all Projs and ask the    */
	/*           Proj with the corresponding projnum for the register */

	if (get_irn_mode(irn) != mode_T) {
		reg = arch_get_irn_register(arch_env, irn);
	}
	else if (is_ia32_irn(irn)) {
		reg = get_ia32_out_reg(irn, pos);
	}
	else {
		const ir_edge_t *edge;

		foreach_out_edge(irn, edge) {
			proj = get_edge_src_irn(edge);
			assert(is_Proj(proj) && "non-Proj from mode_T node");
			if (get_Proj_proj(proj) == pos) {
				reg = arch_get_irn_register(arch_env, proj);
				break;
			}
		}
	}

	assert(reg && "no out register found");
Christian Würdig's avatar
Christian Würdig committed
225
226
227
228
229
230
	return reg;
}

/**
 * Returns the number of the in register at position pos.
 */
Christian Würdig's avatar
Christian Würdig committed
231
int get_ia32_reg_nr(ir_node *irn, int pos, int in_out) {
Christian Würdig's avatar
Christian Würdig committed
232
	const arch_register_t *reg;
Christian Würdig's avatar
Christian Würdig committed
233
234
235
236
237
238
239
240
241

	if (in_out == 1) {
		reg = get_in_reg(irn, pos);
	}
	else {
		reg = get_out_reg(irn, pos);
	}

	return arch_register_get_index(reg);
Christian Würdig's avatar
Christian Würdig committed
242
243
}

Michael Beck's avatar
Michael Beck committed
244
245
246
247
248
enum io_direction {
  IN_REG,
  OUT_REG
};

Christian Würdig's avatar
Christian Würdig committed
249
250
251
/**
 * Returns the name of the in register at position pos.
 */
Michael Beck's avatar
Michael Beck committed
252
static const char *get_ia32_reg_name(ir_node *irn, int pos, enum io_direction in_out) {
Christian Würdig's avatar
Christian Würdig committed
253
254
	const arch_register_t *reg;

Michael Beck's avatar
Michael Beck committed
255
	if (in_out == IN_REG) {
Christian Würdig's avatar
Christian Würdig committed
256
257
258
259
260
261
262
		reg = get_in_reg(irn, pos);
	}
	else {
		reg = get_out_reg(irn, pos);
	}

	return arch_register_get_name(reg);
Christian Würdig's avatar
Christian Würdig committed
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
}

/**
 * Get the register name for a node.
 */
static int ia32_get_reg_name(lc_appendable_t *app,
    const lc_arg_occ_t *occ, const lc_arg_value_t *arg)
{
	const char *buf;
	ir_node    *X  = arg->v_ptr;
	int         nr = occ->width - 1;

	if (!X)
		return lc_arg_append(app, occ, "(null)", 6);

Michael Beck's avatar
Michael Beck committed
278
  buf = get_ia32_reg_name(X, nr, occ->conversion == 'S' ? IN_REG : OUT_REG);
Christian Würdig's avatar
Christian Würdig committed
279

Christian Würdig's avatar
Christian Würdig committed
280
	lc_appendable_chadd(app, '%');
Christian Würdig's avatar
Christian Würdig committed
281
	return lc_arg_append(app, occ, buf, strlen(buf));
282
283
}

Christian Würdig's avatar
Christian Würdig committed
284
285
286
287
288
289
290
291
292
293
294
295
/**
 * Returns the tarval or offset of an ia32 as a string.
 */
static int ia32_const_to_str(lc_appendable_t *app,
    const lc_arg_occ_t *occ, const lc_arg_value_t *arg)
{
	const char *buf;
	ir_node    *X = arg->v_ptr;

	if (!X)
		return lc_arg_append(app, occ, "(null)", 6);

296
	if (occ->conversion == 'C') {
Christian Würdig's avatar
Christian Würdig committed
297
		buf = get_ia32_cnst(X);
Christian Würdig's avatar
Christian Würdig committed
298
	}
299
	else { /* 'O' */
Christian Würdig's avatar
Christian Würdig committed
300
		buf = get_ia32_am_offs(X);
Christian Würdig's avatar
Christian Würdig committed
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
	}

	return lc_arg_append(app, occ, buf, strlen(buf));
}

/**
 * Determines the SSE suffix depending on the mode.
 */
static int ia32_get_mode_suffix(lc_appendable_t *app,
    const lc_arg_occ_t *occ, const lc_arg_value_t *arg)
{
	ir_node *X = arg->v_ptr;

	if (!X)
		return lc_arg_append(app, occ, "(null)", 6);

	if (get_mode_size_bits(get_irn_mode(X)) == 32)
		return lc_appendable_chadd(app, 's');
	else
		return lc_appendable_chadd(app, 'd');
}

/**
 * Return the ia32 printf arg environment.
 * We use the firm environment with some additional handlers.
 */
const lc_arg_env_t *ia32_get_arg_env(void) {
Christian Würdig's avatar
Christian Würdig committed
328
	static lc_arg_env_t *env = NULL;
Christian Würdig's avatar
Christian Würdig committed
329

Christian Würdig's avatar
Christian Würdig committed
330
331
332
	static const lc_arg_handler_t ia32_reg_handler   = { ia32_get_arg_type, ia32_get_reg_name };
	static const lc_arg_handler_t ia32_const_handler = { ia32_get_arg_type, ia32_const_to_str };
	static const lc_arg_handler_t ia32_mode_handler  = { ia32_get_arg_type, ia32_get_mode_suffix };
Christian Würdig's avatar
Christian Würdig committed
333

Christian Würdig's avatar
Christian Würdig committed
334
335
336
	if(env == NULL) {
		/* extend the firm printer */
		env = firm_get_arg_env();
337
			//lc_arg_new_env();
Christian Würdig's avatar
Christian Würdig committed
338

339
340
341
342
343
		lc_arg_register(env, "ia32:sreg", 'S', &ia32_reg_handler);
		lc_arg_register(env, "ia32:dreg", 'D', &ia32_reg_handler);
		lc_arg_register(env, "ia32:cnst", 'C', &ia32_const_handler);
		lc_arg_register(env, "ia32:offs", 'O', &ia32_const_handler);
		lc_arg_register(env, "ia32:mode", 'M', &ia32_mode_handler);
Christian Würdig's avatar
Christian Würdig committed
344
	}
Christian Würdig's avatar
Christian Würdig committed
345

Christian Würdig's avatar
Christian Würdig committed
346
	return env;
Christian Würdig's avatar
Christian Würdig committed
347
348
349
350
351
352
}


/*
 * Add a number to a prefix. This number will not be used a second time.
 */
Christian Würdig's avatar
Christian Würdig committed
353
static char *get_unique_label(char *buf, size_t buflen, const char *prefix) {
Christian Würdig's avatar
Christian Würdig committed
354
355
356
	static unsigned long id = 0;
	snprintf(buf, buflen, "%s%lu", prefix, ++id);
	return buf;
357
358
}

Christian Würdig's avatar
Christian Würdig committed
359
360
361
362
363
364
365
366
367
368
369

/*************************************************
 *                 _ _                         _
 *                (_) |                       | |
 *   ___ _ __ ___  _| |_    ___ ___  _ __   __| |
 *  / _ \ '_ ` _ \| | __|  / __/ _ \| '_ \ / _` |
 * |  __/ | | | | | | |_  | (_| (_) | | | | (_| |
 *  \___|_| |_| |_|_|\__|  \___\___/|_| |_|\__,_|
 *
 *************************************************/

370
371
372
373
/*
 * coding of conditions
 */
struct cmp2conditon_t {
Christian Würdig's avatar
Christian Würdig committed
374
375
	const char *name;
	pn_Cmp      num;
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
};

/*
 * positive conditions for signed compares
 */
static const struct cmp2conditon_t cmp2condition_s[] = {
  { NULL,              pn_Cmp_False },  /* always false */
  { "e",               pn_Cmp_Eq },     /* == */
  { "l",               pn_Cmp_Lt },     /* < */
  { "le",              pn_Cmp_Le },     /* <= */
  { "g",               pn_Cmp_Gt },     /* > */
  { "ge",              pn_Cmp_Ge },     /* >= */
  { "ne",              pn_Cmp_Lg },     /* != */
  { "ordered",         pn_Cmp_Leg },    /* Floating point: ordered */
  { "unordered",       pn_Cmp_Uo },     /* FLoting point: unordered */
  { "unordered or ==", pn_Cmp_Ue },     /* Floating point: unordered or == */
  { "unordered or <",  pn_Cmp_Ul },     /* Floating point: unordered or < */
  { "unordered or <=", pn_Cmp_Ule },    /* Floating point: unordered or <= */
  { "unordered or >",  pn_Cmp_Ug },     /* Floating point: unordered or > */
  { "unordered or >=", pn_Cmp_Uge },    /* Floating point: unordered or >= */
  { "unordered or !=", pn_Cmp_Ne },     /* Floating point: unordered or != */
  { NULL,              pn_Cmp_True },   /* always true */
};

/*
 * positive conditions for unsigned compares
 */
static const struct cmp2conditon_t cmp2condition_u[] = {
  { NULL,              pn_Cmp_False },  /* always false */
  { "e",               pn_Cmp_Eq },     /* == */
  { "b",               pn_Cmp_Lt },     /* < */
  { "be",              pn_Cmp_Le },     /* <= */
  { "a",               pn_Cmp_Gt },     /* > */
  { "ae",              pn_Cmp_Ge },     /* >= */
  { "ne",              pn_Cmp_Lg },     /* != */
  { "ordered",         pn_Cmp_Leg },    /* Floating point: ordered */
  { "unordered",       pn_Cmp_Uo },     /* FLoting point: unordered */
  { "unordered or ==", pn_Cmp_Ue },     /* Floating point: unordered or == */
  { "unordered or <",  pn_Cmp_Ul },     /* Floating point: unordered or < */
  { "unordered or <=", pn_Cmp_Ule },    /* Floating point: unordered or <= */
  { "unordered or >",  pn_Cmp_Ug },     /* Floating point: unordered or > */
  { "unordered or >=", pn_Cmp_Uge },    /* Floating point: unordered or >= */
  { "unordered or !=", pn_Cmp_Ne },     /* Floating point: unordered or != */
  { NULL,              pn_Cmp_True },   /* always true */
};

/*
 * returns the condition code
 */
Christian Würdig's avatar
Christian Würdig committed
425
static const char *get_cmp_suffix(int cmp_code, int unsigned_cmp)
426
{
Christian Würdig's avatar
Christian Würdig committed
427
428
	assert(cmp2condition_s[cmp_code].num == cmp_code);
	assert(cmp2condition_u[cmp_code].num == cmp_code);
429

Christian Würdig's avatar
Christian Würdig committed
430
	return unsigned_cmp ? cmp2condition_u[cmp_code & 7].name : cmp2condition_s[cmp_code & 7].name;
431
432
}

Christian Würdig's avatar
Christian Würdig committed
433
434
435
436
437
/**
 * Returns the target label for a control flow node.
 */
static char *get_cfop_target(const ir_node *irn, char *buf) {
	ir_node *bl = get_irn_link(irn);
438

Christian Würdig's avatar
Christian Würdig committed
439
440
441
	snprintf(buf, SNPRINTF_BUF_LEN, "BLOCK_%ld", get_irn_node_nr(bl));
	return buf;
}
442

Christian Würdig's avatar
Christian Würdig committed
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/**
 * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false)
 */
static void finish_CondJmp(FILE *F, ir_node *irn) {
	const ir_node   *proj;
	const ir_edge_t *edge;
	char buf[SNPRINTF_BUF_LEN];

	edge = get_irn_out_edge_first(irn);
	proj = get_edge_src_irn(edge);
	assert(is_Proj(proj) && "CondJmp with a non-Proj");

	if (get_Proj_proj(proj) == 1) {
		fprintf(F, "\tj%s %s\t\t\t/* cmp(a, b) == TRUE */\n",
					get_cmp_suffix(get_ia32_pncode(irn), !mode_is_signed(get_irn_mode(get_irn_n(irn, 0)))),
					get_cfop_target(proj, buf));
	}
	else  {
		fprintf(F, "\tjn%s %s\t\t\t/* cmp(a, b) == FALSE */\n",
					get_cmp_suffix(get_ia32_pncode(irn), !mode_is_signed(get_irn_mode(get_irn_n(irn, 0)))),
					get_cfop_target(proj, buf));
	}

	edge = get_irn_out_edge_next(irn, edge);
	if (edge) {
		proj = get_edge_src_irn(edge);
		assert(is_Proj(proj) && "CondJmp with a non-Proj");
		fprintf(F, "\tjmp %s\t\t\t/* otherwise */\n", get_cfop_target(proj, buf));
	}
}

/**
 * Emits code for conditional jump with two variables.
 */
static void emit_ia32_CondJmp(ir_node *irn, emit_env_t *env) {
	FILE *F = env->out;

480
	lc_efprintf(ia32_get_arg_env(), F, "\tcmp %2S, %1S\t\t\t/* CondJmp(%+F, %+F) */\n", irn, irn,
Christian Würdig's avatar
Christian Würdig committed
481
482
483
484
485
486
487
488
489
490
																	get_irn_n(irn, 0), get_irn_n(irn, 1));
	finish_CondJmp(F, irn);
}

/**
 * Emits code for conditional jump with immediate.
 */
void emit_ia32_CondJmp_i(ir_node *irn, emit_env_t *env) {
	FILE *F = env->out;

491
	lc_efprintf(ia32_get_arg_env(), F, "\tcmp %C, %1S\t\t\t/* CondJmp_i(%+F) */\n", irn, irn, get_irn_n(irn, 0));
Christian Würdig's avatar
Christian Würdig committed
492
493
494
	finish_CondJmp(F, irn);
}

Christian Würdig's avatar
Christian Würdig committed
495
496
497
498
499
500
501
502
503
504
505
506
507
508


/*********************************************************
 *                 _ _       _
 *                (_) |     (_)
 *   ___ _ __ ___  _| |_     _ _   _ _ __ ___  _ __  ___
 *  / _ \ '_ ` _ \| | __|   | | | | | '_ ` _ \| '_ \/ __|
 * |  __/ | | | | | | |_    | | |_| | | | | | | |_) \__ \
 *  \___|_| |_| |_|_|\__|   | |\__,_|_| |_| |_| .__/|___/
 *                         _/ |               | |
 *                        |__/                |_|
 *********************************************************/

/* jump table entry (target and corresponding number) */
Christian Würdig's avatar
Christian Würdig committed
509
510
511
512
513
typedef struct _branch_t {
	ir_node *target;
	int      value;
} branch_t;

Christian Würdig's avatar
Christian Würdig committed
514
/* jump table for switch generation */
Christian Würdig's avatar
Christian Würdig committed
515
typedef struct _jmp_tbl_t {
Christian Würdig's avatar
Christian Würdig committed
516
517
518
519
520
521
	ir_node  *defProj;         /**< default target */
	int       min_value;       /**< smallest switch case */
	int       max_value;       /**< largest switch case */
	int       num_branches;    /**< number of jumps */
	char     *label;           /**< label of the jump table */
	branch_t *branches;        /**< jump array */
Christian Würdig's avatar
Christian Würdig committed
522
523
} jmp_tbl_t;

Christian Würdig's avatar
Christian Würdig committed
524
525
526
/**
 * Compare two variables of type branch_t. Used to sort all switch cases
 */
Christian Würdig's avatar
Christian Würdig committed
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
static int ia32_cmp_branch_t(const void *a, const void *b) {
	branch_t *b1 = (branch_t *)a;
	branch_t *b2 = (branch_t *)b;

	if (b1->value <= b2->value)
		return -1;
	else
		return 1;
}

/**
 * Emits code for a SwitchJmp (creates a jump table if
 * possible otherwise a cmp-jmp cascade). Port from
 * cggg ia32 backend
 */
void emit_ia32_SwitchJmp(const ir_node *irn, emit_env_t *emit_env) {
	unsigned long       interval;
	char                buf[SNPRINTF_BUF_LEN];
	int                 last_value, i, pn, do_jmp_tbl = 1;
	jmp_tbl_t           tbl;
	ir_node            *proj;
	const ir_edge_t    *edge;
	const lc_arg_env_t *env = ia32_get_arg_env();
	FILE               *F   = emit_env->out;

	/* fill the table structure */
553
	tbl.label        = xmalloc(SNPRINTF_BUF_LEN);
Christian Würdig's avatar
Christian Würdig committed
554
555
556
	tbl.label        = get_unique_label(tbl.label, SNPRINTF_BUF_LEN, "JMPTBL_");
	tbl.defProj      = NULL;
	tbl.num_branches = get_irn_n_edges(irn);
557
	tbl.branches     = xcalloc(tbl.num_branches, sizeof(tbl.branches[0]));
Christian Würdig's avatar
Christian Würdig committed
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
	tbl.min_value    = INT_MAX;
	tbl.max_value    = INT_MIN;

	i = 0;
	/* go over all proj's and collect them */
	foreach_out_edge(irn, edge) {
		proj = get_edge_src_irn(edge);
		assert(is_Proj(proj) && "Only proj allowed at SwitchJmp");

		pn = get_Proj_proj(proj);

		/* create branch entry */
		tbl.branches[i].target = proj;
		tbl.branches[i].value  = pn;

		tbl.min_value = pn < tbl.min_value ? pn : tbl.min_value;
		tbl.max_value = pn > tbl.max_value ? pn : tbl.max_value;

		/* check for default proj */
		if (pn == get_ia32_pncode(irn)) {
			assert(tbl.defProj == NULL && "found two defProjs at SwitchJmp");
			tbl.defProj = proj;
		}

		i++;
	}

	/* sort the branches by their number */
Christian Würdig's avatar
Christian Würdig committed
586
	qsort(tbl.branches, tbl.num_branches, sizeof(tbl.branches[0]), ia32_cmp_branch_t);
Christian Würdig's avatar
Christian Würdig committed
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604

	/* two-complement's magic make this work without overflow */
	interval = tbl.max_value - tbl.min_value;

	/* check value interval */
	if (interval > 16 * 1024) {
		do_jmp_tbl = 0;
	}

	/* check ratio of value interval to number of branches */
	if ((float)(interval + 1) / (float)tbl.num_branches > 8.0) {
		do_jmp_tbl = 0;
	}

	if (do_jmp_tbl) {
		/* emit the table */
		if (tbl.min_value != 0) {
			fprintf(F, "\tcmpl %lu, -%d", interval, tbl.min_value);
605
			lc_efprintf(env, F, "(%1S)\t\t/* first switch value is not 0 */\n", irn);
Christian Würdig's avatar
Christian Würdig committed
606
607
608
		}
		else {
			fprintf(F, "\tcmpl %lu, ", interval);
609
			lc_efprintf(env, F, "%1S\t\t\t/* compare for switch */\n", irn);
Christian Würdig's avatar
Christian Würdig committed
610
611
612
613
614
615
616
		}

		fprintf(F, "\tja %s\t\t\t/* default jump if out of range  */\n", get_cfop_target(tbl.defProj, buf));

		if (tbl.num_branches > 1) {
			/* create table */

617
618
			//fprintf(F, "\tjmp *%s", tbl.label);
			lc_efprintf(env, F, "\tjmp *%s(,%1S,4)\t\t/* get jump table entry as target */\n", tbl.label, irn);
Christian Würdig's avatar
Christian Würdig committed
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643

			fprintf(F, "\t.section\t.rodata\t\t/* start jump table */\n");
			fprintf(F, "\t.align 4\n");

			fprintf(F, "%s:\n", tbl.label);
			fprintf(F, "\t.long %s\t\t\t/* case %d */\n", get_cfop_target(tbl.branches[0].target, buf), tbl.branches[0].value);

			last_value = tbl.branches[0].value;
			for (i = 1; i < tbl.num_branches; ++i) {
				while (++last_value < tbl.branches[i].value) {
					fprintf(F, "\t.long %s\t\t/* default case */\n", get_cfop_target(tbl.defProj, buf));
				}
				fprintf(F, "\t.long %s\t\t\t/* case %d */\n", get_cfop_target(tbl.branches[i].target, buf), last_value);
			}

			fprintf(F, "\t.text\t\t\t\t/* end of jump table */\n");
		}
		else {
			/* one jump is enough */
			fprintf(F, "\tjmp %s\t\t/* only one case given */\n", get_cfop_target(tbl.branches[0].target, buf));
		}
	}
	else { // no jump table
		for (i = 0; i < tbl.num_branches; ++i) {
			fprintf(F, "\tcmpl %d, ", tbl.branches[i].value);
644
			lc_efprintf(env, F, "%1S", irn);
Christian Würdig's avatar
Christian Würdig committed
645
646
647
648
649
650
651
			fprintf(F, "\t\t\t/* case %d */\n", tbl.branches[i].value);
			fprintf(F, "\tje %s\n", get_cfop_target(tbl.branches[i].target, buf));
		}

		fprintf(F, "\tjmp %s\t\t\t/* default case */\n", get_cfop_target(tbl.defProj, buf));
	}

Christian Würdig's avatar
Christian Würdig committed
652
653
	if (tbl.label)
		free(tbl.label);
Christian Würdig's avatar
Christian Würdig committed
654
655
656
657
658
659
660
661
662
663
664
665
666
667
	if (tbl.branches)
		free(tbl.branches);
}

/**
 * Emits code for a unconditional jump.
 */
void emit_Jmp(ir_node *irn, emit_env_t *env) {
	FILE *F = env->out;

	char buf[SNPRINTF_BUF_LEN];
	ir_fprintf(F, "\tjmp %s\t\t\t/* Jmp(%+F) */\n", get_cfop_target(irn, buf), get_irn_link(irn));
}

Christian Würdig's avatar
Christian Würdig committed
668
669
670
671
672
673
674
675
676
677
678
679
680


/****************************
 *                  _
 *                 (_)
 *  _ __  _ __ ___  _  ___
 * | '_ \| '__/ _ \| |/ __|
 * | |_) | | | (_) | |\__ \
 * | .__/|_|  \___/| ||___/
 * | |            _/ |
 * |_|           |__/
 ****************************/

Christian Würdig's avatar
Christian Würdig committed
681
682
683
684
685
686
/**
 * Emits code for a proj -> node
 */
void emit_Proj(ir_node *irn, emit_env_t *env) {
	ir_node *pred = get_Proj_pred(irn);

Christian Würdig's avatar
Christian Würdig committed
687
	if (get_irn_op(pred) == op_Start) {
Christian Würdig's avatar
Christian Würdig committed
688
689
690
691
692
693
694
695
696
697
		switch(get_Proj_proj(irn)) {
			case pn_Start_X_initial_exec:
				emit_Jmp(irn, env);
				break;
			default:
				break;
		}
	}
}

698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
/**********************************
 *   _____                  ____
 *  / ____|                |  _ \
 * | |     ___  _ __  _   _| |_) |
 * | |    / _ \| '_ \| | | |  _ <
 * | |___| (_) | |_) | |_| | |_) |
 *  \_____\___/| .__/ \__, |____/
 *             | |     __/ |
 *             |_|    |___/
 **********************************/

static void emit_CopyB_prolog(FILE *F, int rem, int size) {
	fprintf(F, "\t/* memcopy %d bytes*/\n", size);
	fprintf(F, "\tcld\t\t\t\t/* copy direction forward*/\n");

	switch(rem) {
		case 1:
			fprintf(F, "\tmovsb\t\t\t\t/* memcopy remainder 1 */\n");
			break;
		case 2:
			fprintf(F, "\tmovsw\t\t\t\t/* memcopy remainder 2 */\n");
			break;
		case 3:
			fprintf(F, "\tmovsb\t\t\t\t/* memcopy remainder 3 */\n");
			fprintf(F, "\tmovsw\t\t\t\t/* memcopy remainder 3 */\n");
			break;
	}
}

void emit_ia32_CopyB(ir_node *irn, emit_env_t *emit_env) {
	FILE   *F    = emit_env->out;
	tarval *tv   = get_ia32_Immop_tarval(irn);
	int     rem  = get_tarval_long(tv);
	int     size = get_tarval_long(get_ia32_Immop_tarval(get_irn_n(irn, 2)));

	emit_CopyB_prolog(F, rem, size);

	fprintf(F, "\trep movsd\t\t\t\t/* memcopy */\n");
}

void emit_ia32_CopyB_i(ir_node *irn, emit_env_t *emit_env) {
	tarval *tv   = get_ia32_Immop_tarval(irn);
	int     size = get_tarval_long(tv);
	FILE   *F    = emit_env->out;

	emit_CopyB_prolog(F, size & 0x3, size);

	size >>= 2;
	while (size--) {
		fprintf(F, "\tmovsd\t\t\t\t/* memcopy unrolled */\n");
	}
}

Christian Würdig's avatar
Christian Würdig committed
751
752
753
754
755
756
757
758
759
760
761
/********************
 *   _____      _ _
 *  / ____|    | | |
 * | |     __ _| | |
 * | |    / _` | | |
 * | |___| (_| | | |
 *  \_____\__,_|_|_|
 *
 ********************/

void emit_ia32_Call(ir_node *irn, emit_env_t *emit_env) {
Christian Würdig's avatar
Christian Würdig committed
762
763
764
765
}



Christian Würdig's avatar
Christian Würdig committed
766
767
768
769
770
771
772
773
774
775
/***********************************************************************************
 *                  _          __                                             _
 *                 (_)        / _|                                           | |
 *  _ __ ___   __ _ _ _ __   | |_ _ __ __ _ _ __ ___   _____      _____  _ __| | __
 * | '_ ` _ \ / _` | | '_ \  |  _| '__/ _` | '_ ` _ \ / _ \ \ /\ / / _ \| '__| |/ /
 * | | | | | | (_| | | | | | | | | | | (_| | | | | | |  __/\ V  V / (_) | |  |   <
 * |_| |_| |_|\__,_|_|_| |_| |_| |_|  \__,_|_| |_| |_|\___| \_/\_/ \___/|_|  |_|\_\
 *
 ***********************************************************************************/

Christian Würdig's avatar
Christian Würdig committed
776
/**
777
778
 * Enters the emitter functions for handled nodes into the generic
 * pointer of an opcode.
Christian Würdig's avatar
Christian Würdig committed
779
 */
780
781
void ia32_register_emitters(void) {
  int i;
Christian Würdig's avatar
Christian Würdig committed
782

783
784
785
786
#define BEGIN()      if (0)
#define IA32_EMIT(a) else if (op_ia32_##a == op) op->ops.generic = (op_func)emit_ia32_##a
#define EMIT(a)      else if (op_##a == op)      op->ops.generic = (op_func)emit_##a
#define END()        else op->ops.generic = (op_func)NULL
Christian Würdig's avatar
Christian Würdig committed
787

788
789
  for (i = get_irp_n_opcodes() - 1; i >= 0; --i) {
    ir_op *op = get_irp_opcode(i);
Christian Würdig's avatar
Christian Würdig committed
790

791
792
793
    BEGIN();
	  /* generated int emitter functions */
	  IA32_EMIT(Const);
Christian Würdig's avatar
Christian Würdig committed
794

795
796
797
798
799
	  IA32_EMIT(Add);
	  IA32_EMIT(Sub);
	  IA32_EMIT(Minus);
	  IA32_EMIT(Inc);
	  IA32_EMIT(Dec);
Christian Würdig's avatar
Christian Würdig committed
800

801
802
803
	  IA32_EMIT(Max);
	  IA32_EMIT(Min);
	  IA32_EMIT(CMov);
Christian Würdig's avatar
Christian Würdig committed
804

805
806
807
808
	  IA32_EMIT(And);
	  IA32_EMIT(Or);
	  IA32_EMIT(Eor);
	  IA32_EMIT(Not);
Christian Würdig's avatar
Christian Würdig committed
809

810
811
812
813
814
	  IA32_EMIT(Shl);
	  IA32_EMIT(Shr);
	  IA32_EMIT(Shrs);
	  IA32_EMIT(RotL);
	  IA32_EMIT(RotR);
Christian Würdig's avatar
Christian Würdig committed
815

816
	  IA32_EMIT(Lea);
Christian Würdig's avatar
Christian Würdig committed
817

818
	  IA32_EMIT(Mul);
Christian Würdig's avatar
Christian Würdig committed
819

820
821
	  IA32_EMIT(Cdq);
	  IA32_EMIT(DivMod);
Christian Würdig's avatar
Christian Würdig committed
822

823
824
	  IA32_EMIT(Store);
	  IA32_EMIT(Load);
Christian Würdig's avatar
Christian Würdig committed
825

826
827
	  IA32_EMIT(CopyB);
	  IA32_EMIT(CopyB_i);
828

829
830
	  /* generated floating point emitter */
	  IA32_EMIT(fConst);
Christian Würdig's avatar
Christian Würdig committed
831

832
833
	  IA32_EMIT(fAdd);
	  IA32_EMIT(fSub);
Christian Würdig's avatar
Christian Würdig committed
834

835
836
	  IA32_EMIT(fMul);
	  IA32_EMIT(fDiv);
Christian Würdig's avatar
Christian Würdig committed
837

838
839
	  IA32_EMIT(fMin);
	  IA32_EMIT(fMax);
Christian Würdig's avatar
Christian Würdig committed
840

841
842
	  IA32_EMIT(fLoad);
	  IA32_EMIT(fStore);
Christian Würdig's avatar
Christian Würdig committed
843

844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
	  /* other emitter functions */
	  IA32_EMIT(CondJmp);
	  IA32_EMIT(SwitchJmp);
	  IA32_EMIT(Call);

	  EMIT(Jmp);
	  EMIT(Proj);

    END();
  }

#undef BEGIN
#undef IA32_EMIT
#undef EMIT
#undef END

}

/**
 * Emits code for a node.
 */
static void ia32_emit_node(ir_node *irn, void *env) {
	emit_env_t *emit_env   = env;
	firm_dbg_module_t *mod = emit_env->mod;
	FILE              *F   = emit_env->out;
  ir_op             *op = get_irn_op(irn);

	DBG((mod, LEVEL_1, "emitting code for %+F\n", irn));
Christian Würdig's avatar
Christian Würdig committed
872

873
874
875
876
  if (op->ops.generic) {
    void (*emit)(ir_node *, void *) = (void (*)(ir_node *, void *))op->ops.generic;
    (*emit)(irn, env);
  }
Christian Würdig's avatar
Christian Würdig committed
877
878
879
880
881
882
883
884

	ir_fprintf(F, "\t\t\t\t\t/* %+F */\n", irn);
}

/**
 * Walks over the nodes in a block connected by scheduling edges
 * and emits code for each node.
 */
885
static void ia32_gen_block(ir_node *block, void *env) {
Christian Würdig's avatar
Christian Würdig committed
886
887
	ir_node *irn;

Christian Würdig's avatar
Christian Würdig committed
888
889
890
	if (! is_Block(block))
		return;

Christian Würdig's avatar
Christian Würdig committed
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
921
922
923
924
925
926
927
928
929
930
931
932
933
934
	fprintf(((emit_env_t *)env)->out, "BLOCK_%ld:\n", get_irn_node_nr(block));
	sched_foreach(block, irn) {
		ia32_emit_node(irn, env);
	}
}


/**
 * Emits code for function start.
 */
void ia32_emit_start(FILE *F, ir_graph *irg) {
	const char *irg_name = get_entity_name(get_irg_entity(irg));

	fprintf(F, "\t.text\n");
	fprintf(F, ".globl %s\n", irg_name);
	fprintf(F, "\t.type\t%s, @function\n", irg_name);
	fprintf(F, "%s:\n", irg_name);
}

/**
 * Emits code for function end
 */
void ia32_emit_end(FILE *F, ir_graph *irg) {
	const char *irg_name = get_entity_name(get_irg_entity(irg));

	fprintf(F, "\tret\n");
	fprintf(F, "\t.size\t%s, .-%s\n\n", irg_name, irg_name);
}

/**
 * Sets labels for control flow nodes (jump target)
 * TODO: Jump optimization
 */
void ia32_gen_labels(ir_node *block, void *env) {
	ir_node *pred;
	int n = get_Block_n_cfgpreds(block);

	for (n--; n >= 0; n--) {
		pred = get_Block_cfgpred(block, n);
		set_irn_link(pred, block);
	}
}

/**
935
 * Main driver. Emits the code for one routine.
Christian Würdig's avatar
Christian Würdig committed
936
 */
Christian Würdig's avatar
Christian Würdig committed
937
void ia32_gen_routine(FILE *F, ir_graph *irg, const ia32_code_gen_t *cg) {
Christian Würdig's avatar
Christian Würdig committed
938
939
	emit_env_t emit_env;

Christian Würdig's avatar
Christian Würdig committed
940
941
	emit_env.mod      = firm_dbg_register("ir.be.codegen.ia32");
	emit_env.out      = F;
Christian Würdig's avatar
Christian Würdig committed
942
943
	emit_env.arch_env = cg->arch_env;
	emit_env.cg       = cg;
Christian Würdig's avatar
Christian Würdig committed
944

945
946
947
	/* set the global arch_env (needed by print hooks) */
	arch_env = cg->arch_env;

Christian Würdig's avatar
Christian Würdig committed
948
949
	ia32_emit_start(F, irg);
	irg_block_walk_graph(irg, ia32_gen_labels, NULL, &emit_env);
Christian Würdig's avatar
Christian Würdig committed
950
	irg_walk_blkwise_graph(irg, NULL, ia32_gen_block, &emit_env);
Christian Würdig's avatar
Christian Würdig committed
951
	ia32_emit_end(F, irg);
952
}