ia32_emitter.c 22.3 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
8
#include "tv.h"
#include "iredges.h"
Christian Würdig's avatar
Christian Würdig committed
9
10
11
12
#include "debug.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "irop_t.h"
Christian Würdig's avatar
Christian Würdig committed
13
#include "irargs_t.h"
Christian Würdig's avatar
Christian Würdig committed
14
15
16

#include "../besched.h"

17
#include "ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
18
#include "gen_ia32_emitter.h"
19
20
#include "ia32_nodes_attr.h"
#include "ia32_new_nodes.h"
Christian Würdig's avatar
Christian Würdig committed
21
22
23
24
#include "ia32_map_regs.h"

#define SNPRINTF_BUF_LEN 128

Christian Würdig's avatar
Christian Würdig committed
25
static const arch_env_t *arch_env = NULL;
26
27


Christian Würdig's avatar
Christian Würdig committed
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
/*************************************************************
 *             _       _    __   _          _
 *            (_)     | |  / _| | |        | |
 *  _ __  _ __ _ _ __ | |_| |_  | |__   ___| |_ __   ___ _ __
 * | '_ \| '__| | '_ \| __|  _| | '_ \ / _ \ | '_ \ / _ \ '__|
 * | |_) | |  | | | | | |_| |   | | | |  __/ | |_) |  __/ |
 * | .__/|_|  |_|_| |_|\__|_|   |_| |_|\___|_| .__/ \___|_|
 * | |                                       | |
 * |_|                                       |_|
 *************************************************************/

/**
 * Return node's tarval as string.
 */
const char *node_const_to_str(ir_node *n) {
	char   *buf;
	tarval *tv = get_ia32_Immop_tarval(n);

	if (tv) {
		buf = malloc(SNPRINTF_BUF_LEN);
		tarval_snprintf(buf, SNPRINTF_BUF_LEN, tv);
		return buf;
	}
	else if (get_ia32_old_ir(n)) {
		return get_sc_name(get_ia32_old_ir(n));
	}
	else
		return "0";
56
57
}

Christian Würdig's avatar
Christian Würdig committed
58
59
60
61
62
/**
 * Returns node's offset as string.
 */
char *node_offset_to_str(ir_node *n) {
	char   *buf;
63
	tarval *tv = get_ia32_am_offs(n);
Christian Würdig's avatar
Christian Würdig committed
64
65
66
67
68
69
70
71

	if (tv) {
		buf = malloc(SNPRINTF_BUF_LEN);
		tarval_snprintf(buf, SNPRINTF_BUF_LEN, tv);
		return buf;
	}
	else
		return "";
72
73
}

Christian Würdig's avatar
Christian Würdig committed
74
75
76
/* 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;
77
78
}

Christian Würdig's avatar
Christian Würdig committed
79
80

/**
Christian Würdig's avatar
Christian Würdig committed
81
 * Returns the register at in position pos.
Christian Würdig's avatar
Christian Würdig committed
82
83
84
85
86
87
88
89
90
91
92
 */
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
93
	reg = arch_get_irn_register(arch_env, op);
Christian Würdig's avatar
Christian Würdig committed
94

Christian Würdig's avatar
Christian Würdig committed
95
96
97
98
99
100
101
102
103
104
105
106
	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
107

Christian Würdig's avatar
Christian Würdig committed
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
	/* 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
133
134
135
136
137
138
	return reg;
}

/**
 * Returns the number of the in register at position pos.
 */
Christian Würdig's avatar
Christian Würdig committed
139
int get_ia32_reg_nr(ir_node *irn, int pos, int in_out) {
Christian Würdig's avatar
Christian Würdig committed
140
	const arch_register_t *reg;
Christian Würdig's avatar
Christian Würdig committed
141
142
143
144
145
146
147
148
149

	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
150
151
152
153
154
}

/**
 * Returns the name of the in register at position pos.
 */
Christian Würdig's avatar
Christian Würdig committed
155
const char *get_ia32_reg_name(ir_node *irn, int pos, int in_out) {
Christian Würdig's avatar
Christian Würdig committed
156
157
	const arch_register_t *reg;

Christian Würdig's avatar
Christian Würdig committed
158
159
160
161
162
163
164
165
	if (in_out == 1) {
		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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
}

/**
 * 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);

181
	if (occ->conversion == 'S') {
Christian Würdig's avatar
Christian Würdig committed
182
		buf = get_ia32_reg_name(X, nr, 1);
Christian Würdig's avatar
Christian Würdig committed
183
	}
184
	else { /* 'D' */
Christian Würdig's avatar
Christian Würdig committed
185
		buf = get_ia32_reg_name(X, nr, 0);
Christian Würdig's avatar
Christian Würdig committed
186
187
	}

Christian Würdig's avatar
Christian Würdig committed
188
	lc_appendable_chadd(app, '%');
Christian Würdig's avatar
Christian Würdig committed
189
	return lc_arg_append(app, occ, buf, strlen(buf));
190
191
}

Christian Würdig's avatar
Christian Würdig committed
192
193
194
195
196
197
198
199
200
201
202
203
/**
 * 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);

204
	if (occ->conversion == 'C') {
Christian Würdig's avatar
Christian Würdig committed
205
206
		buf = node_const_to_str(X);
	}
207
	else { /* 'O' */
Christian Würdig's avatar
Christian Würdig committed
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
		buf = node_offset_to_str(X);
	}

	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
236
	static lc_arg_env_t *env = NULL;
Christian Würdig's avatar
Christian Würdig committed
237

Christian Würdig's avatar
Christian Würdig committed
238
239
240
	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
241

Christian Würdig's avatar
Christian Würdig committed
242
243
244
	if(env == NULL) {
		/* extend the firm printer */
		env = firm_get_arg_env();
245
			//lc_arg_new_env();
Christian Würdig's avatar
Christian Würdig committed
246

247
248
249
250
251
		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
252
	}
Christian Würdig's avatar
Christian Würdig committed
253

Christian Würdig's avatar
Christian Würdig committed
254
	return env;
Christian Würdig's avatar
Christian Würdig committed
255
256
257
258
259
}

/**
 * For 2-address code we need to make sure the first src reg is equal to dest reg.
 */
260
void equalize_dest_src(FILE *F, ir_node *n) {
Christian Würdig's avatar
Christian Würdig committed
261
262
	if (get_ia32_reg_nr(n, 0, 1) != get_ia32_reg_nr(n, 0, 0)) {
		if (get_irn_arity(n) > 1 && get_ia32_reg_nr(n, 1, 1) == get_ia32_reg_nr(n, 0, 0)) {
Christian Würdig's avatar
Christian Würdig committed
263
			if (! is_op_commutative(get_irn_op(n))) {
Christian Würdig's avatar
Christian Würdig committed
264
				/* we only need to exchange for non-commutative ops */
265
				lc_efprintf(ia32_get_arg_env(), F, "\txchg %1S, %2S\t\t\t/* xchg src1 <-> src2 for 2 address code */\n", n, n);
Christian Würdig's avatar
Christian Würdig committed
266
267
268
			}
		}
		else {
269
			lc_efprintf(ia32_get_arg_env(), F, "\tmovl %1S, %1D\t\t\t/* src -> dest for 2 address code */\n", n, n);
Christian Würdig's avatar
Christian Würdig committed
270
271
272
273
274
275
276
277
278
279
280
		}
	}
}

/*
 * Add a number to a prefix. This number will not be used a second time.
 */
char *get_unique_label(char *buf, size_t buflen, const char *prefix) {
	static unsigned long id = 0;
	snprintf(buf, buflen, "%s%lu", prefix, ++id);
	return buf;
281
282
}

Christian Würdig's avatar
Christian Würdig committed
283
284
285
286
287
288
289
290
291
292
293

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

294
295
296
297
/*
 * coding of conditions
 */
struct cmp2conditon_t {
Christian Würdig's avatar
Christian Würdig committed
298
299
	const char *name;
	pn_Cmp      num;
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
};

/*
 * 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
349
static const char *get_cmp_suffix(int cmp_code, int unsigned_cmp)
350
{
Christian Würdig's avatar
Christian Würdig committed
351
352
	assert(cmp2condition_s[cmp_code].num == cmp_code);
	assert(cmp2condition_u[cmp_code].num == cmp_code);
353

Christian Würdig's avatar
Christian Würdig committed
354
	return unsigned_cmp ? cmp2condition_u[cmp_code & 7].name : cmp2condition_s[cmp_code & 7].name;
355
356
}

Christian Würdig's avatar
Christian Würdig committed
357
358
359
360
361
/**
 * 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);
362

Christian Würdig's avatar
Christian Würdig committed
363
364
365
	snprintf(buf, SNPRINTF_BUF_LEN, "BLOCK_%ld", get_irn_node_nr(bl));
	return buf;
}
366

Christian Würdig's avatar
Christian Würdig committed
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/**
 * 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;

404
	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
405
406
407
408
409
410
411
412
413
414
																	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;

415
	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
416
417
418
	finish_CondJmp(F, irn);
}

Christian Würdig's avatar
Christian Würdig committed
419
420
421
422
423
424
425
426
427
428
429
430
431
432


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

/* jump table entry (target and corresponding number) */
Christian Würdig's avatar
Christian Würdig committed
433
434
435
436
437
typedef struct _branch_t {
	ir_node *target;
	int      value;
} branch_t;

Christian Würdig's avatar
Christian Würdig committed
438
/* jump table for switch generation */
Christian Würdig's avatar
Christian Würdig committed
439
typedef struct _jmp_tbl_t {
Christian Würdig's avatar
Christian Würdig committed
440
441
442
443
444
445
	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
446
447
} jmp_tbl_t;

Christian Würdig's avatar
Christian Würdig committed
448
449
450
/**
 * Compare two variables of type branch_t. Used to sort all switch cases
 */
Christian Würdig's avatar
Christian Würdig committed
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
480
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 */
	tbl.label        = malloc(SNPRINTF_BUF_LEN);
	tbl.label        = get_unique_label(tbl.label, SNPRINTF_BUF_LEN, "JMPTBL_");
	tbl.defProj      = NULL;
	tbl.num_branches = get_irn_n_edges(irn);
Christian Würdig's avatar
Christian Würdig committed
481
	tbl.branches     = calloc(tbl.num_branches, sizeof(tbl.branches[0]));
Christian Würdig's avatar
Christian Würdig committed
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
	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
510
	qsort(tbl.branches, tbl.num_branches, sizeof(tbl.branches[0]), ia32_cmp_branch_t);
Christian Würdig's avatar
Christian Würdig committed
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528

	/* 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);
529
			lc_efprintf(env, F, "(%1S)\t\t/* first switch value is not 0 */\n", irn);
Christian Würdig's avatar
Christian Würdig committed
530
531
532
		}
		else {
			fprintf(F, "\tcmpl %lu, ", interval);
533
			lc_efprintf(env, F, "%1S\t\t\t/* compare for switch */\n", irn);
Christian Würdig's avatar
Christian Würdig committed
534
535
536
537
538
539
540
		}

		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 */

541
542
			//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
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567

			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);
568
			lc_efprintf(env, F, "%1S", irn);
Christian Würdig's avatar
Christian Würdig committed
569
570
571
572
573
574
575
			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
576
577
	if (tbl.label)
		free(tbl.label);
Christian Würdig's avatar
Christian Würdig committed
578
579
580
581
582
583
584
585
586
587
588
589
590
591
	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
592
593
594
595
596
597
598
599
600
601
602
603
604


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

Christian Würdig's avatar
Christian Würdig committed
605
606
607
608
609
610
/**
 * 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
611
	if (get_irn_op(pred) == op_Start) {
Christian Würdig's avatar
Christian Würdig committed
612
613
614
615
616
617
618
619
620
621
		switch(get_Proj_proj(irn)) {
			case pn_Start_X_initial_exec:
				emit_Jmp(irn, env);
				break;
			default:
				break;
		}
	}
}

Christian Würdig's avatar
Christian Würdig committed
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
/********************
 *   _____      _ _
 *  / ____|    | | |
 * | |     __ _| | |
 * | |    / _` | | |
 * | |___| (_| | | |
 *  \_____\__,_|_|_|
 *
 ********************/

void emit_ia32_Call(ir_node *irn, emit_env_t *emit_env) {
	int                 i, n      = get_irn_arity(irn);
	int                 args_size = 0;
	ir_node            *sync      = get_irn_n(irn, n - 1);
	FILE               *F         = emit_env->out;
	const lc_arg_env_t *env       = ia32_get_arg_env();

	if (get_irn_op(sync) == op_Sync) {
		/* We have stack arguments */
		ir_node **args = get_Sync_preds_arr(sync);

		for (i = 0; i < get_Sync_n_preds(sync); i++) {
			lc_efprintf(env, F, "\tpush %1D\t\t\t\t/* push %+F on stack */\n", args[i], args[i]);

			if (mode_is_int(get_irn_mode(args[i]))) {
				args_size += 4;
			}
			else {
				args_size += 16;
			}
		}
	}

	lc_efprintf(env, F, "\tcall %C\t\t\t/* %+F */\n", irn, irn);

	if (get_irn_op(sync) == op_Sync) {
		/* We had stack arguments: clear the stack */
		fprintf(F, "\tadd %d, ", args_size);
		if (emit_env->cg->has_alloca) {
			fprintf(F, "%ebp");
		}
		else {
			fprintf(F, "%esp");
		}
		fprintf(F, "\t\t\t\t/* clear stack after call */\n");
	}
}
Christian Würdig's avatar
Christian Würdig committed
669
670
671
672
673
674
675
676
677
678
679
680


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

Christian Würdig's avatar
Christian Würdig committed
681
/**
Christian Würdig's avatar
Christian Würdig committed
682
 * Emits code for a node.
Christian Würdig's avatar
Christian Würdig committed
683
684
685
686
687
688
689
690
691
692
693
694
 */
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;

	DBG((mod, LEVEL_1, "emitting code for %+F\n", irn));

#define IA32_EMIT(a) if (is_ia32_##a(irn))               { emit_ia32_##a(irn, emit_env); return; }
#define EMIT(a)      if (get_irn_opcode(irn) == iro_##a) { emit_##a(irn, emit_env); return; }

	/* generated int emitter functions */
Christian Würdig's avatar
Christian Würdig committed
695
696
697
	IA32_EMIT(Copy);
	IA32_EMIT(Perm);

Christian Würdig's avatar
Christian Würdig committed
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
751
752
753
754
755
756
757
758
759
760
	IA32_EMIT(Const);

	IA32_EMIT(Add);
	IA32_EMIT(Add_i);
	IA32_EMIT(Sub);
	IA32_EMIT(Sub_i);
	IA32_EMIT(Minus);
	IA32_EMIT(Inc);
	IA32_EMIT(Dec);

	IA32_EMIT(Max);
	IA32_EMIT(Min);

	IA32_EMIT(And);
	IA32_EMIT(And_i);
	IA32_EMIT(Or);
	IA32_EMIT(Or_i);
	IA32_EMIT(Eor);
	IA32_EMIT(Eor_i);
	IA32_EMIT(Not);

	IA32_EMIT(Shl);
	IA32_EMIT(Shl_i);
	IA32_EMIT(Shr);
	IA32_EMIT(Shr_i);
	IA32_EMIT(Shrs);
	IA32_EMIT(Shrs_i);
	IA32_EMIT(RotL);
	IA32_EMIT(RotL_i);
	IA32_EMIT(RotR);

	IA32_EMIT(Lea);
	IA32_EMIT(Lea_i);

	IA32_EMIT(Mul);
	IA32_EMIT(Mul_i);

	IA32_EMIT(Cltd);
	IA32_EMIT(DivMod);

	IA32_EMIT(Store);
	IA32_EMIT(Load);

	/* generated floating point emitter */
	IA32_EMIT(fConst);

	IA32_EMIT(fAdd);
	IA32_EMIT(fSub);
	IA32_EMIT(fMinus);

	IA32_EMIT(fMul);
	IA32_EMIT(fDiv);

	IA32_EMIT(fMin);
	IA32_EMIT(fMax);

	IA32_EMIT(fLoad);
	IA32_EMIT(fStore);

	/* other emitter functions */
	IA32_EMIT(CondJmp);
	IA32_EMIT(CondJmp_i);
	IA32_EMIT(SwitchJmp);
Christian Würdig's avatar
Christian Würdig committed
761
	IA32_EMIT(Call);
Christian Würdig's avatar
Christian Würdig committed
762
763
764
765
766
767
768
769
770
771
772
773
774
775

	EMIT(Jmp);
	EMIT(Proj);

	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.
 */
void ia32_gen_block(ir_node *block, void *env) {
	ir_node *irn;

Christian Würdig's avatar
Christian Würdig committed
776
777
778
	if (! is_Block(block))
		return;

Christian Würdig's avatar
Christian Würdig committed
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
	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);
	}
}

/**
 * Main driver
 */
Christian Würdig's avatar
Christian Würdig committed
825
void ia32_gen_routine(FILE *F, ir_graph *irg, const ia32_code_gen_t *cg) {
Christian Würdig's avatar
Christian Würdig committed
826
827
	emit_env_t emit_env;

Christian Würdig's avatar
Christian Würdig committed
828
829
	emit_env.mod      = firm_dbg_register("ir.be.codegen.ia32");
	emit_env.out      = F;
Christian Würdig's avatar
Christian Würdig committed
830
831
	emit_env.arch_env = cg->arch_env;
	emit_env.cg       = cg;
Christian Würdig's avatar
Christian Würdig committed
832
833
834

	ia32_emit_start(F, irg);
	irg_block_walk_graph(irg, ia32_gen_labels, NULL, &emit_env);
Christian Würdig's avatar
Christian Würdig committed
835
	irg_walk_blkwise_graph(irg, NULL, ia32_gen_block, &emit_env);
Christian Würdig's avatar
Christian Würdig committed
836
	ia32_emit_end(F, irg);
837
}