Remove write-only variable. = and + output constraints are handled way earlier.
[libfirm] / ir / be / ia32 / ia32_common_transform.c
1 /*
2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
3  *
4  * This file is part of libFirm.
5  *
6  * This file may be distributed and/or modified under the terms of the
7  * GNU General Public License version 2 as published by the Free Software
8  * Foundation and appearing in the file LICENSE.GPL included in the
9  * packaging of this file.
10  *
11  * Licensees holding valid libFirm Professional Edition licenses may use
12  * this file in accordance with the libFirm Commercial License.
13  * Agreement provided with the Software.
14  *
15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17  * PURPOSE.
18  */
19
20 /**
21  * @file
22  * @brief       This file implements the common parts of IR transformation from
23  *              firm into ia32-Firm.
24  * @author      Matthias Braun, Sebastian Buchwald
25  * @version     $Id: ia32_common_transform.c 21012 2008-08-06 13:35:17Z beck $
26  */
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "error.h"
32 #include "irargs_t.h"
33 #include "ircons.h"
34 #include "irprintf.h"
35 #include "typerep.h"
36
37 #include "../betranshlp.h"
38 #include "../beirg_t.h"
39
40 #include "ia32_architecture.h"
41 #include "ia32_common_transform.h"
42 #include "ia32_new_nodes.h"
43
44 #include "gen_ia32_new_nodes.h"
45 #include "gen_ia32_regalloc_if.h"
46
47 /** hold the current code generator during transformation */
48 ia32_code_gen_t *env_cg = NULL;
49
50 heights_t *heights = NULL;
51
52 static const arch_register_req_t no_register_req = {
53         arch_register_req_type_none,
54         NULL,                         /* regclass */
55         NULL,                         /* limit bitset */
56         0,                            /* same pos */
57         0                             /* different pos */
58 };
59
60 static int check_immediate_constraint(long val, char immediate_constraint_type)
61 {
62         switch (immediate_constraint_type) {
63                 case 0:
64                 case 'i': return 1;
65
66                 case 'I': return    0 <= val && val <=  31;
67                 case 'J': return    0 <= val && val <=  63;
68                 case 'K': return -128 <= val && val <= 127;
69                 case 'L': return val == 0xff || val == 0xffff;
70                 case 'M': return    0 <= val && val <=   3;
71                 case 'N': return    0 <= val && val <= 255;
72                 case 'O': return    0 <= val && val <= 127;
73
74                 default: panic("Invalid immediate constraint found");
75         }
76 }
77
78 /**
79  * creates a unique ident by adding a number to a tag
80  *
81  * @param tag   the tag string, must contain a %d if a number
82  *              should be added
83  */
84 static ident *unique_id(const char *tag)
85 {
86         static unsigned id = 0;
87         char str[256];
88
89         snprintf(str, sizeof(str), tag, ++id);
90         return new_id_from_str(str);
91 }
92
93 /**
94  * Get a primitive type for a mode.
95  */
96 static ir_type *ia32_get_prim_type(pmap *types, ir_mode *mode)
97 {
98         pmap_entry *e = pmap_find(types, mode);
99         ir_type *res;
100
101         if (! e) {
102                 char buf[64];
103                 snprintf(buf, sizeof(buf), "prim_type_%s", get_mode_name(mode));
104                 res = new_type_primitive(new_id_from_str(buf), mode);
105                 set_type_alignment_bytes(res, 16);
106                 pmap_insert(types, mode, res);
107         }
108         else
109                 res = e->value;
110         return res;
111 }
112
113 ir_entity *create_float_const_entity(ir_node *cnst)
114 {
115         ia32_isa_t *isa = env_cg->isa;
116         tarval *key     = get_Const_tarval(cnst);
117         pmap_entry *e   = pmap_find(isa->tv_ent, key);
118         ir_entity *res;
119         ir_graph *rem;
120
121         if (e == NULL) {
122                 tarval  *tv   = key;
123                 ir_mode *mode = get_tarval_mode(tv);
124                 ir_type *tp;
125
126                 if (! ia32_cg_config.use_sse2) {
127                         /* try to reduce the mode to produce smaller sized entities */
128                         if (mode != mode_F) {
129                                 if (tarval_ieee754_can_conv_lossless(tv, mode_F)) {
130                                         mode = mode_F;
131                                         tv = tarval_convert_to(tv, mode);
132                                 } else if (mode != mode_D) {
133                                         if (tarval_ieee754_can_conv_lossless(tv, mode_D)) {
134                                                 mode = mode_D;
135                                                 tv = tarval_convert_to(tv, mode);
136                                         }
137                                 }
138                         }
139                 }
140
141                 if (mode == get_irn_mode(cnst)) {
142                         /* mode was not changed */
143                         tp = get_Const_type(cnst);
144                         if (tp == firm_unknown_type)
145                                 tp = ia32_get_prim_type(isa->types, mode);
146                 } else
147                         tp = ia32_get_prim_type(isa->types, mode);
148
149                 res = new_entity(get_glob_type(), unique_id(".LC%u"), tp);
150
151                 set_entity_ld_ident(res, get_entity_ident(res));
152                 set_entity_visibility(res, visibility_local);
153                 set_entity_variability(res, variability_constant);
154                 set_entity_allocation(res, allocation_static);
155
156                  /* we create a new entity here: It's initialization must resist on the
157                     const code irg */
158                 rem = current_ir_graph;
159                 current_ir_graph = get_const_code_irg();
160                 set_atomic_ent_value(res, new_Const_type(tv, tp));
161                 current_ir_graph = rem;
162
163                 pmap_insert(isa->tv_ent, key, res);
164         } else {
165                 res = e->value;
166         }
167
168         return res;
169 }
170
171 ir_node *create_Immediate(ir_entity *symconst, int symconst_sign, long val)
172 {
173         ir_graph *irg         = current_ir_graph;
174         ir_node  *start_block = get_irg_start_block(irg);
175         ir_node  *immediate   = new_rd_ia32_Immediate(NULL, irg, start_block,
176                                                       symconst, symconst_sign, val);
177         arch_set_irn_register(env_cg->arch_env, immediate, &ia32_gp_regs[REG_GP_NOREG]);
178
179         return immediate;
180 }
181
182 const arch_register_t *ia32_get_clobber_register(const char *clobber)
183 {
184         const arch_register_t       *reg = NULL;
185         int                          c;
186         size_t                       r;
187         const arch_register_class_t *cls;
188
189         /* TODO: construct a hashmap instead of doing linear search for clobber
190          * register */
191         for(c = 0; c < N_CLASSES; ++c) {
192                 cls = & ia32_reg_classes[c];
193                 for(r = 0; r < cls->n_regs; ++r) {
194                         const arch_register_t *temp_reg = arch_register_for_index(cls, r);
195                         if(strcmp(temp_reg->name, clobber) == 0
196                                         || (c == CLASS_ia32_gp && strcmp(temp_reg->name+1, clobber) == 0)) {
197                                 reg = temp_reg;
198                                 break;
199                         }
200                 }
201                 if(reg != NULL)
202                         break;
203         }
204
205         return reg;
206 }
207
208 #ifndef NDEBUG
209 const char *ia32_get_old_node_name(ia32_code_gen_t *cg, ir_node *irn) {
210         ia32_isa_t *isa = (ia32_isa_t*) cg->arch_env;
211
212         lc_eoprintf(firm_get_arg_env(), isa->name_obst, "%+F", irn);
213         obstack_1grow(isa->name_obst, 0);
214         return obstack_finish(isa->name_obst);
215 }
216 #endif /* NDEBUG */
217
218 int ia32_mode_needs_gp_reg(ir_mode *mode) {
219         if(mode == mode_fpcw)
220                 return 0;
221         if(get_mode_size_bits(mode) > 32)
222                 return 0;
223         return mode_is_int(mode) || mode_is_reference(mode) || mode == mode_b;
224 }
225
226 static void parse_asm_constraints(constraint_t *constraint, const char *c,
227                            int is_output)
228 {
229         char                         immediate_type     = '\0';
230         unsigned                     limited            = 0;
231         const arch_register_class_t *cls                = NULL;
232         int                          memory_possible       = 0;
233         int                          all_registers_allowed = 0;
234         int                          p;
235         int                          same_as = -1;
236
237         memset(constraint, 0, sizeof(constraint[0]));
238         constraint->same_as = -1;
239
240         if(*c == 0) {
241                 /* a memory constraint: no need to do anything in backend about it
242                  * (the dependencies are already respected by the memory edge of
243                  * the node) */
244                 return;
245         }
246
247         /* TODO: improve error messages with node and source info. (As users can
248          * easily hit these) */
249         while(*c != 0) {
250                 switch(*c) {
251                 case ' ':
252                 case '\t':
253                 case '\n':
254                         break;
255
256                 /* Skip out/in-out marker */
257                 case '=': break;
258                 case '+': break;
259
260                 case '*':
261                         ++c;
262                         break;
263                 case '#':
264                         while(*c != 0 && *c != ',')
265                                 ++c;
266                         break;
267
268                 case 'a':
269                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
270                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
271                         limited |= 1 << REG_EAX;
272                         break;
273                 case 'b':
274                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
275                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
276                         limited |= 1 << REG_EBX;
277                         break;
278                 case 'c':
279                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
280                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
281                         limited |= 1 << REG_ECX;
282                         break;
283                 case 'd':
284                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
285                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
286                         limited |= 1 << REG_EDX;
287                         break;
288                 case 'D':
289                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
290                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
291                         limited |= 1 << REG_EDI;
292                         break;
293                 case 'S':
294                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
295                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
296                         limited |= 1 << REG_ESI;
297                         break;
298                 case 'Q':
299                 case 'q':
300                         /* q means lower part of the regs only, this makes no
301                          * difference to Q for us (we only assign whole registers) */
302                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
303                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
304                         limited |= 1 << REG_EAX | 1 << REG_EBX | 1 << REG_ECX |
305                                    1 << REG_EDX;
306                         break;
307                 case 'A':
308                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
309                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
310                         limited |= 1 << REG_EAX | 1 << REG_EDX;
311                         break;
312                 case 'l':
313                         assert(cls == NULL || cls == &ia32_reg_classes[CLASS_ia32_gp]);
314                         cls      = &ia32_reg_classes[CLASS_ia32_gp];
315                         limited |= 1 << REG_EAX | 1 << REG_EBX | 1 << REG_ECX |
316                                    1 << REG_EDX | 1 << REG_ESI | 1 << REG_EDI |
317                                    1 << REG_EBP;
318                         break;
319
320                 case 'R':
321                 case 'r':
322                 case 'p':
323                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_gp])
324                                 panic("multiple register classes not supported");
325                         cls                   = &ia32_reg_classes[CLASS_ia32_gp];
326                         all_registers_allowed = 1;
327                         break;
328
329                 case 'f':
330                 case 't':
331                 case 'u':
332                         /* TODO: mark values so the x87 simulator knows about t and u */
333                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_vfp])
334                                 panic("multiple register classes not supported");
335                         cls                   = &ia32_reg_classes[CLASS_ia32_vfp];
336                         all_registers_allowed = 1;
337                         break;
338
339                 case 'Y':
340                 case 'x':
341                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_xmm])
342                                 panic("multiple register classes not supproted");
343                         cls                   = &ia32_reg_classes[CLASS_ia32_xmm];
344                         all_registers_allowed = 1;
345                         break;
346
347                 case 'I':
348                 case 'J':
349                 case 'K':
350                 case 'L':
351                 case 'M':
352                 case 'N':
353                 case 'O':
354                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_gp])
355                                 panic("multiple register classes not supported");
356                         if (immediate_type != '\0')
357                                 panic("multiple immediate types not supported");
358                         cls            = &ia32_reg_classes[CLASS_ia32_gp];
359                         immediate_type = *c;
360                         break;
361                 case 'n':
362                 case 'i':
363                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_gp])
364                                 panic("multiple register classes not supported");
365                         if (immediate_type != '\0')
366                                 panic("multiple immediate types not supported");
367                         cls            = &ia32_reg_classes[CLASS_ia32_gp];
368                         immediate_type = 'i';
369                         break;
370
371                 case 'X':
372                 case 'g':
373                         if (cls != NULL && cls != &ia32_reg_classes[CLASS_ia32_gp])
374                                 panic("multiple register classes not supported");
375                         if (immediate_type != '\0')
376                                 panic("multiple immediate types not supported");
377                         immediate_type        = 'i';
378                         cls                   = &ia32_reg_classes[CLASS_ia32_gp];
379                         all_registers_allowed = 1;
380                         memory_possible       = 1;
381                         break;
382
383                 case '0':
384                 case '1':
385                 case '2':
386                 case '3':
387                 case '4':
388                 case '5':
389                 case '6':
390                 case '7':
391                 case '8':
392                 case '9':
393                         if (is_output)
394                                 panic("can only specify same constraint on input");
395
396                         sscanf(c, "%d%n", &same_as, &p);
397                         if(same_as >= 0) {
398                                 c += p;
399                                 continue;
400                         }
401                         break;
402
403                 case 'm':
404                 case 'o':
405                 case 'V':
406                         /* memory constraint no need to do anything in backend about it
407                          * (the dependencies are already respected by the memory edge of
408                          * the node) */
409                         memory_possible = 1;
410                         break;
411
412                 case 'E': /* no float consts yet */
413                 case 'F': /* no float consts yet */
414                 case 's': /* makes no sense on x86 */
415                 case '<': /* no autodecrement on x86 */
416                 case '>': /* no autoincrement on x86 */
417                 case 'C': /* sse constant not supported yet */
418                 case 'G': /* 80387 constant not supported yet */
419                 case 'y': /* we don't support mmx registers yet */
420                 case 'Z': /* not available in 32 bit mode */
421                 case 'e': /* not available in 32 bit mode */
422                         panic("unsupported asm constraint '%c' found in (%+F)",
423                               *c, current_ir_graph);
424                         break;
425                 default:
426                         panic("unknown asm constraint '%c' found in (%+F)", *c,
427                               current_ir_graph);
428                         break;
429                 }
430                 ++c;
431         }
432
433         if(same_as >= 0) {
434                 if (cls != NULL)
435                         panic("same as and register constraint not supported");
436                 if (immediate_type != '\0')
437                         panic("same as and immediate constraint not supported");
438         }
439
440         if (cls == NULL && same_as < 0) {
441                 if (!memory_possible)
442                         panic("no constraint specified for assembler input");
443         }
444
445         constraint->same_as               = same_as;
446         constraint->cls                   = cls;
447         constraint->allowed_registers     = limited;
448         constraint->all_registers_allowed = all_registers_allowed;
449         constraint->memory_possible       = memory_possible;
450         constraint->immediate_type        = immediate_type;
451 }
452
453 ir_node *gen_ASM(ir_node *node)
454 {
455         ir_graph                   *irg       = current_ir_graph;
456         ir_node                    *block = NULL;
457         ir_node                    *new_block = NULL;
458         dbg_info                   *dbgi      = get_irn_dbg_info(node);
459         int                         i, arity;
460         int                         out_idx;
461         ir_node                   **in;
462         ir_node                    *new_node;
463         int                         out_arity;
464         int                         n_out_constraints;
465         int                         n_clobbers;
466         const arch_register_req_t **out_reg_reqs;
467         const arch_register_req_t **in_reg_reqs;
468         ia32_asm_reg_t             *register_map;
469         unsigned                    reg_map_size = 0;
470         struct obstack             *obst;
471         const ir_asm_constraint    *in_constraints;
472         const ir_asm_constraint    *out_constraints;
473         ident                     **clobbers;
474         int                         clobbers_flags = 0;
475         unsigned                    clobber_bits[N_CLASSES];
476
477         memset(&clobber_bits, 0, sizeof(clobber_bits));
478
479         switch (be_transformer) {
480         case TRANSFORMER_DEFAULT:
481                 block     = get_nodes_block(node);
482                 new_block = be_transform_node(block);
483                 break;
484
485 #ifdef FIRM_GRGEN_BE
486         case TRANSFORMER_PBQP:
487                 new_block = get_nodes_block(node);
488                 break;
489 #endif
490
491         default:
492                 panic("invalid transformer");
493         }
494
495         /* workaround for lots of buggy code out there as most people think volatile
496          * asm is enough for everything and forget the flags (linux kernel, etc.)
497          */
498         if (get_irn_pinned(node) == op_pin_state_pinned) {
499                 clobbers_flags = 1;
500         }
501
502         arity = get_irn_arity(node);
503         in    = alloca(arity * sizeof(in[0]));
504         memset(in, 0, arity * sizeof(in[0]));
505
506         clobbers   = get_ASM_clobbers(node);
507         n_clobbers = 0;
508         for (i = 0; i < get_ASM_n_clobbers(node); ++i) {
509                 const arch_register_req_t *req;
510                 const char                *c = get_id_str(clobbers[i]);
511
512                 if (strcmp(c, "memory") == 0)
513                         continue;
514                 if (strcmp(c, "cc") == 0) {
515                         clobbers_flags = 1;
516                         continue;
517                 }
518
519                 req = parse_clobber(c);
520                 clobber_bits[req->cls->index] |= *req->limited;
521
522                 n_clobbers++;
523         }
524         n_out_constraints = get_ASM_n_output_constraints(node);
525         out_arity         = n_out_constraints + n_clobbers;
526
527         in_constraints  = get_ASM_input_constraints(node);
528         out_constraints = get_ASM_output_constraints(node);
529
530         /* determine size of register_map */
531         for (out_idx = 0; out_idx < n_out_constraints; ++out_idx) {
532                 const ir_asm_constraint *constraint = &out_constraints[out_idx];
533                 if (constraint->pos > reg_map_size)
534                         reg_map_size = constraint->pos;
535         }
536         for (i = 0; i < arity; ++i) {
537                 const ir_asm_constraint   *constraint = &in_constraints[i];
538                 if(constraint->pos > reg_map_size)
539                         reg_map_size = constraint->pos;
540         }
541         ++reg_map_size;
542
543         obst         = get_irg_obstack(irg);
544         register_map = NEW_ARR_D(ia32_asm_reg_t, obst, reg_map_size);
545         memset(register_map, 0, reg_map_size * sizeof(register_map[0]));
546
547         /* construct output constraints */
548         out_reg_reqs = obstack_alloc(obst, out_arity * sizeof(out_reg_reqs[0]));
549
550         for (out_idx = 0; out_idx < n_out_constraints; ++out_idx) {
551                 const ir_asm_constraint   *constraint = &out_constraints[out_idx];
552                 const char                *c       = get_id_str(constraint->constraint);
553                 unsigned                   pos        = constraint->pos;
554                 constraint_t               parsed_constraint;
555                 const arch_register_req_t *req;
556
557                 parse_asm_constraints(&parsed_constraint, c, 1);
558                 req = make_register_req(&parsed_constraint, n_out_constraints,
559                                         out_reg_reqs, out_idx);
560                 out_reg_reqs[out_idx] = req;
561
562                 register_map[pos].use_input = 0;
563                 register_map[pos].valid     = 1;
564                 register_map[pos].memory    = 0;
565                 register_map[pos].inout_pos = out_idx;
566                 register_map[pos].mode      = constraint->mode;
567         }
568
569         /* inputs + input constraints */
570         in_reg_reqs = obstack_alloc(obst, arity * sizeof(in_reg_reqs[0]));
571         for (i = 0; i < arity; ++i) {
572                 ir_node                   *pred         = get_irn_n(node, i);
573                 const ir_asm_constraint   *constraint   = &in_constraints[i];
574                 ident                     *constr_id    = constraint->constraint;
575                 const char                *c            = get_id_str(constr_id);
576                 unsigned                   pos          = constraint->pos;
577                 int                        is_memory_op = 0;
578                 ir_node                   *input        = NULL;
579                 unsigned                   r_clobber_bits;
580                 constraint_t               parsed_constraint;
581                 const arch_register_req_t *req;
582
583                 parse_asm_constraints(&parsed_constraint, c, 0);
584                 if (parsed_constraint.cls != NULL) {
585                         r_clobber_bits = clobber_bits[parsed_constraint.cls->index];
586                         if (r_clobber_bits != 0) {
587                                 if (parsed_constraint.all_registers_allowed) {
588                                         parsed_constraint.all_registers_allowed = 0;
589                                         be_abi_set_non_ignore_regs(env_cg->birg->abi,
590                                                         parsed_constraint.cls,
591                                                         &parsed_constraint.allowed_registers);
592                                 }
593                                 parsed_constraint.allowed_registers &= ~r_clobber_bits;
594                         }
595                 }
596
597                 req = make_register_req(&parsed_constraint, n_out_constraints,
598                                         out_reg_reqs, i);
599                 in_reg_reqs[i] = req;
600
601                 if (parsed_constraint.immediate_type != '\0') {
602                         char imm_type = parsed_constraint.immediate_type;
603                         input = try_create_Immediate(pred, imm_type);
604                 }
605
606                 if (input == NULL) {
607                         ir_node *pred = NULL;
608                         switch (be_transformer) {
609                         case TRANSFORMER_DEFAULT:
610                                 pred  = get_irn_n(node, i);
611                                 input = be_transform_node(pred);
612                                 break;
613
614 #ifdef FIRM_GRGEN_BE
615                         case TRANSFORMER_PBQP:
616                                 input = get_irn_n(node, i);
617                                 break;
618 #endif
619
620                         default: panic("invalid transformer");
621                         }
622
623                         if (parsed_constraint.cls == NULL
624                                         && parsed_constraint.same_as < 0) {
625                                 is_memory_op = 1;
626                         } else if(parsed_constraint.memory_possible) {
627                                 /* TODO: match Load or Load/Store if memory possible is set */
628                         }
629                 }
630                 in[i] = input;
631
632                 register_map[pos].use_input = 1;
633                 register_map[pos].valid     = 1;
634                 register_map[pos].memory    = is_memory_op;
635                 register_map[pos].inout_pos = i;
636                 register_map[pos].mode      = constraint->mode;
637         }
638
639         /* parse clobbers */
640         for (i = 0; i < get_ASM_n_clobbers(node); ++i) {
641                 const char                *c = get_id_str(clobbers[i]);
642                 const arch_register_req_t *req;
643
644                 if (strcmp(c, "memory") == 0 || strcmp(c, "cc") == 0)
645                         continue;
646
647                 req = parse_clobber(c);
648                 out_reg_reqs[out_idx] = req;
649                 ++out_idx;
650         }
651
652         new_node = new_rd_ia32_Asm(dbgi, irg, new_block, arity, in, out_arity,
653                                    get_ASM_text(node), register_map);
654
655         /* Prevent the ASM node from being scheduled before the Barrier, if it has
656          * no inputs */
657         if (arity == 0 && get_irg_start_block(irg) == new_block) {
658                 add_irn_dep(new_node, get_irg_frame(irg));
659         }
660
661         set_ia32_out_req_all(new_node, out_reg_reqs);
662         set_ia32_in_req_all(new_node, in_reg_reqs);
663
664         SET_IA32_ORIG_NODE(new_node, ia32_get_old_node_name(env_cg, node));
665
666         return new_node;
667 }
668
669 ir_node *gen_CopyB(ir_node *node) {
670         ir_node  *block    = NULL;
671         ir_node  *src      = NULL;
672         ir_node  *new_src  = NULL;
673         ir_node  *dst      = NULL;
674         ir_node  *new_dst  = NULL;
675         ir_node  *mem      = NULL;
676         ir_node  *new_mem  = NULL;
677         ir_node  *res      = NULL;
678         ir_graph *irg      = current_ir_graph;
679         dbg_info *dbgi     = get_irn_dbg_info(node);
680         int      size      = get_type_size_bytes(get_CopyB_type(node));
681         int      rem;
682
683         switch (be_transformer) {
684                 case TRANSFORMER_DEFAULT:
685                         block    = be_transform_node(get_nodes_block(node));
686                         src      = get_CopyB_src(node);
687                         new_src  = be_transform_node(src);
688                         dst      = get_CopyB_dst(node);
689                         new_dst  = be_transform_node(dst);
690                         mem      = get_CopyB_mem(node);
691                         new_mem  = be_transform_node(mem);
692                         break;
693
694 #ifdef FIRM_GRGEN_BE
695                 case TRANSFORMER_PBQP:
696                         block    = get_nodes_block(node);
697                         new_src  = get_CopyB_src(node);
698                         new_dst  = get_CopyB_dst(node);
699                         new_mem  = get_CopyB_mem(node);
700                         break;
701 #endif
702
703                 default: panic("invalid transformer");
704         }
705
706         /* If we have to copy more than 32 bytes, we use REP MOVSx and */
707         /* then we need the size explicitly in ECX.                    */
708         if (size >= 32 * 4) {
709                 rem = size & 0x3; /* size % 4 */
710                 size >>= 2;
711
712                 res = new_rd_ia32_Const(dbgi, irg, block, NULL, 0, size);
713                 add_irn_dep(res, get_irg_frame(irg));
714
715                 res = new_rd_ia32_CopyB(dbgi, irg, block, new_dst, new_src, res, new_mem, rem);
716         } else {
717                 if(size == 0) {
718                         ir_fprintf(stderr, "Optimization warning copyb %+F with size <4\n",
719                                    node);
720                 }
721                 res = new_rd_ia32_CopyB_i(dbgi, irg, block, new_dst, new_src, new_mem, size);
722         }
723
724         SET_IA32_ORIG_NODE(res, ia32_get_old_node_name(env_cg, node));
725
726         return res;
727 }
728
729 ir_node *gen_Proj_tls(ir_node *node) {
730         ir_node  *block = NULL;
731         ir_graph *irg   = current_ir_graph;
732         dbg_info *dbgi  = NULL;
733         ir_node  *res   = NULL;
734
735         switch (be_transformer) {
736                 case TRANSFORMER_DEFAULT:
737                         block = be_transform_node(get_nodes_block(node));
738                         break;
739
740 #ifdef FIRM_GRGEN_BE
741                 case TRANSFORMER_PBQP:
742                         block = get_nodes_block(node);
743                         break;
744 #endif
745
746                 default: panic("invalid transformer");
747         }
748
749         res   = new_rd_ia32_LdTls(dbgi, irg, block, mode_Iu);
750
751         return res;
752 }
753
754 ir_node *gen_Unknown(ir_node *node)
755 {
756         ir_mode *mode = get_irn_mode(node);
757
758         if (mode_is_float(mode)) {
759                 if (ia32_cg_config.use_sse2) {
760                         return ia32_new_Unknown_xmm(env_cg);
761                 } else {
762                         /* Unknown nodes are buggy in x87 simulator, use zero for now... */
763                         ir_graph *irg   = current_ir_graph;
764                         dbg_info *dbgi  = get_irn_dbg_info(node);
765                         ir_node  *block = get_irg_start_block(irg);
766                         ir_node  *ret   = new_rd_ia32_vfldz(dbgi, irg, block);
767
768                         /* Const Nodes before the initial IncSP are a bad idea, because
769                          * they could be spilled and we have no SP ready at that point yet.
770                          * So add a dependency to the initial frame pointer calculation to
771                          * avoid that situation.
772                          */
773                         add_irn_dep(ret, get_irg_frame(irg));
774                         return ret;
775                 }
776         } else if (ia32_mode_needs_gp_reg(mode)) {
777                 return ia32_new_Unknown_gp(env_cg);
778         } else {
779                 panic("unsupported Unknown-Mode");
780         }
781         return NULL;
782 }
783
784 const arch_register_req_t *make_register_req(const constraint_t *constraint,
785                 int n_outs, const arch_register_req_t **out_reqs, int pos)
786 {
787         struct obstack      *obst    = get_irg_obstack(current_ir_graph);
788         int                  same_as = constraint->same_as;
789         arch_register_req_t *req;
790
791         if (same_as >= 0) {
792                 const arch_register_req_t *other_constr;
793
794                 if (same_as >= n_outs)
795                         panic("invalid output number in same_as constraint");
796
797                 other_constr     = out_reqs[same_as];
798
799                 req              = obstack_alloc(obst, sizeof(req[0]));
800                 *req             = *other_constr;
801                 req->type       |= arch_register_req_type_should_be_same;
802                 req->other_same  = 1U << pos;
803
804                 /* switch constraints. This is because in firm we have same_as
805                  * constraints on the output constraints while in the gcc asm syntax
806                  * they are specified on the input constraints */
807                 out_reqs[same_as] = req;
808                 return other_constr;
809         }
810
811         /* pure memory ops */
812         if (constraint->cls == NULL) {
813                 return &no_register_req;
814         }
815
816         if (constraint->allowed_registers != 0
817                         && !constraint->all_registers_allowed) {
818                 unsigned *limited_ptr;
819
820                 req         = obstack_alloc(obst, sizeof(req[0]) + sizeof(unsigned));
821                 memset(req, 0, sizeof(req[0]));
822                 limited_ptr = (unsigned*) (req+1);
823
824                 req->type    = arch_register_req_type_limited;
825                 *limited_ptr = constraint->allowed_registers;
826                 req->limited = limited_ptr;
827         } else {
828                 req       = obstack_alloc(obst, sizeof(req[0]));
829                 memset(req, 0, sizeof(req[0]));
830                 req->type = arch_register_req_type_normal;
831         }
832         req->cls = constraint->cls;
833
834         return req;
835 }
836
837 const arch_register_req_t *parse_clobber(const char *clobber)
838 {
839         struct obstack        *obst = get_irg_obstack(current_ir_graph);
840         const arch_register_t *reg  = ia32_get_clobber_register(clobber);
841         arch_register_req_t   *req;
842         unsigned              *limited;
843
844         if(reg == NULL) {
845                 panic("Register '%s' mentioned in asm clobber is unknown", clobber);
846         }
847
848         assert(reg->index < 32);
849
850         limited  = obstack_alloc(obst, sizeof(limited[0]));
851         *limited = 1 << reg->index;
852
853         req          = obstack_alloc(obst, sizeof(req[0]));
854         memset(req, 0, sizeof(req[0]));
855         req->type    = arch_register_req_type_limited;
856         req->cls     = arch_register_get_class(reg);
857         req->limited = limited;
858
859         return req;
860 }
861
862 ir_node *try_create_Immediate(ir_node *node, char immediate_constraint_type)
863 {
864         int          minus         = 0;
865         tarval      *offset        = NULL;
866         int          offset_sign   = 0;
867         long         val = 0;
868         ir_entity   *symconst_ent  = NULL;
869         int          symconst_sign = 0;
870         ir_mode     *mode;
871         ir_node     *cnst          = NULL;
872         ir_node     *symconst      = NULL;
873         ir_node     *new_node;
874
875         mode = get_irn_mode(node);
876         if(!mode_is_int(mode) && !mode_is_reference(mode)) {
877                 return NULL;
878         }
879
880         if(is_Minus(node)) {
881                 minus = 1;
882                 node  = get_Minus_op(node);
883         }
884
885         if(is_Const(node)) {
886                 cnst        = node;
887                 symconst    = NULL;
888                 offset_sign = minus;
889         } else if(is_SymConst(node)) {
890                 cnst          = NULL;
891                 symconst      = node;
892                 symconst_sign = minus;
893         } else if(is_Add(node)) {
894                 ir_node *left  = get_Add_left(node);
895                 ir_node *right = get_Add_right(node);
896                 if(is_Const(left) && is_SymConst(right)) {
897                         cnst          = left;
898                         symconst      = right;
899                         symconst_sign = minus;
900                         offset_sign   = minus;
901                 } else if(is_SymConst(left) && is_Const(right)) {
902                         cnst          = right;
903                         symconst      = left;
904                         symconst_sign = minus;
905                         offset_sign   = minus;
906                 }
907         } else if(is_Sub(node)) {
908                 ir_node *left  = get_Sub_left(node);
909                 ir_node *right = get_Sub_right(node);
910                 if(is_Const(left) && is_SymConst(right)) {
911                         cnst          = left;
912                         symconst      = right;
913                         symconst_sign = !minus;
914                         offset_sign   = minus;
915                 } else if(is_SymConst(left) && is_Const(right)) {
916                         cnst          = right;
917                         symconst      = left;
918                         symconst_sign = minus;
919                         offset_sign   = !minus;
920                 }
921         } else {
922                 return NULL;
923         }
924
925         if(cnst != NULL) {
926                 offset = get_Const_tarval(cnst);
927                 if(tarval_is_long(offset)) {
928                         val = get_tarval_long(offset);
929                 } else {
930                         ir_fprintf(stderr, "Optimisation Warning: tarval from %+F is not a "
931                                    "long?\n", cnst);
932                         return NULL;
933                 }
934
935                 if(!check_immediate_constraint(val, immediate_constraint_type))
936                         return NULL;
937         }
938         if(symconst != NULL) {
939                 if(immediate_constraint_type != 0) {
940                         /* we need full 32bits for symconsts */
941                         return NULL;
942                 }
943
944                 /* unfortunately the assembler/linker doesn't support -symconst */
945                 if(symconst_sign)
946                         return NULL;
947
948                 if(get_SymConst_kind(symconst) != symconst_addr_ent)
949                         return NULL;
950                 symconst_ent = get_SymConst_entity(symconst);
951         }
952         if(cnst == NULL && symconst == NULL)
953                 return NULL;
954
955         if(offset_sign && offset != NULL) {
956                 offset = tarval_neg(offset);
957         }
958
959         new_node = create_Immediate(symconst_ent, symconst_sign, val);
960
961         return new_node;
962 }