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47dd2e78 | 1 | /* Integrated Register Allocator (IRA) intercommunication header file. |
2 | Copyright (C) 2006, 2007, 2008 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by Vladimir Makarov <vmakarov@redhat.com>. | |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 3, or (at your option) any later | |
11 | version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "cfgloop.h" | |
23 | #include "ira.h" | |
24 | #include "alloc-pool.h" | |
25 | ||
26 | /* To provide consistency in naming, all IRA external variables, | |
27 | functions, common typedefs start with prefix ira_. */ | |
28 | ||
29 | #ifdef ENABLE_CHECKING | |
30 | #define ENABLE_IRA_CHECKING | |
31 | #endif | |
32 | ||
33 | #ifdef ENABLE_IRA_CHECKING | |
34 | #define ira_assert(c) gcc_assert (c) | |
35 | #else | |
36 | #define ira_assert(c) | |
37 | #endif | |
38 | ||
39 | /* Compute register frequency from edge frequency FREQ. It is | |
40 | analogous to REG_FREQ_FROM_BB. When optimizing for size, or | |
41 | profile driven feedback is available and the function is never | |
42 | executed, frequency is always equivalent. Otherwise rescale the | |
43 | edge frequency. */ | |
44 | #define REG_FREQ_FROM_EDGE_FREQ(freq) \ | |
45 | (optimize_size || (flag_branch_probabilities && !ENTRY_BLOCK_PTR->count) \ | |
46 | ? REG_FREQ_MAX : (freq * REG_FREQ_MAX / BB_FREQ_MAX) \ | |
47 | ? (freq * REG_FREQ_MAX / BB_FREQ_MAX) : 1) | |
48 | ||
49 | /* All natural loops. */ | |
50 | extern struct loops ira_loops; | |
51 | ||
52 | /* A modified value of flag `-fira-verbose' used internally. */ | |
53 | extern int internal_flag_ira_verbose; | |
54 | ||
55 | /* Dump file of the allocator if it is not NULL. */ | |
56 | extern FILE *ira_dump_file; | |
57 | ||
58 | /* Typedefs for pointers to allocno live range, allocno, and copy of | |
59 | allocnos. */ | |
60 | typedef struct ira_allocno_live_range *allocno_live_range_t; | |
61 | typedef struct ira_allocno *ira_allocno_t; | |
62 | typedef struct ira_allocno_copy *ira_copy_t; | |
63 | ||
64 | /* Definition of vector of allocnos and copies. */ | |
65 | DEF_VEC_P(ira_allocno_t); | |
66 | DEF_VEC_ALLOC_P(ira_allocno_t, heap); | |
67 | DEF_VEC_P(ira_copy_t); | |
68 | DEF_VEC_ALLOC_P(ira_copy_t, heap); | |
69 | ||
70 | /* Typedef for pointer to the subsequent structure. */ | |
71 | typedef struct ira_loop_tree_node *ira_loop_tree_node_t; | |
72 | ||
73 | /* In general case, IRA is a regional allocator. The regions are | |
74 | nested and form a tree. Currently regions are natural loops. The | |
75 | following structure describes loop tree node (representing basic | |
76 | block or loop). We need such tree because the loop tree from | |
77 | cfgloop.h is not convenient for the optimization: basic blocks are | |
78 | not a part of the tree from cfgloop.h. We also use the nodes for | |
79 | storing additional information about basic blocks/loops for the | |
80 | register allocation purposes. */ | |
81 | struct ira_loop_tree_node | |
82 | { | |
83 | /* The node represents basic block if children == NULL. */ | |
84 | basic_block bb; /* NULL for loop. */ | |
85 | struct loop *loop; /* NULL for BB. */ | |
86 | /* The next (loop) node of with the same parent. SUBLOOP_NEXT is | |
87 | always NULL for BBs. */ | |
88 | ira_loop_tree_node_t subloop_next, next; | |
89 | /* The first (loop) node immediately inside the node. SUBLOOPS is | |
90 | always NULL for BBs. */ | |
91 | ira_loop_tree_node_t subloops, children; | |
92 | /* The node immediately containing given node. */ | |
93 | ira_loop_tree_node_t parent; | |
94 | ||
95 | /* Loop level in range [0, ira_loop_tree_height). */ | |
96 | int level; | |
97 | ||
98 | /* All the following members are defined only for nodes representing | |
99 | loops. */ | |
100 | ||
101 | /* Allocnos in the loop corresponding to their regnos. If it is | |
102 | NULL the loop does not form a separate register allocation region | |
103 | (e.g. because it has abnormal enter/exit edges and we can not put | |
104 | code for register shuffling on the edges if a different | |
105 | allocation is used for a pseudo-register on different sides of | |
106 | the edges). Caps are not in the map (remember we can have more | |
107 | one cap with the same regno in a region). */ | |
108 | ira_allocno_t *regno_allocno_map; | |
109 | ||
110 | /* Maximal register pressure inside loop for given register class | |
111 | (defined only for the cover classes). */ | |
112 | int reg_pressure[N_REG_CLASSES]; | |
113 | ||
2bae4acc | 114 | /* Numbers of allocnos referred or living in the loop node (except |
115 | for its subloops). */ | |
116 | bitmap all_allocnos; | |
117 | ||
118 | /* Numbers of allocnos living at the loop borders. */ | |
119 | bitmap border_allocnos; | |
47dd2e78 | 120 | |
121 | /* Regnos of pseudos modified in the loop node (including its | |
122 | subloops). */ | |
123 | bitmap modified_regnos; | |
124 | ||
47dd2e78 | 125 | /* Numbers of copies referred in the corresponding loop. */ |
126 | bitmap local_copies; | |
127 | }; | |
128 | ||
129 | /* The root of the loop tree corresponding to the all function. */ | |
130 | extern ira_loop_tree_node_t ira_loop_tree_root; | |
131 | ||
132 | /* Height of the loop tree. */ | |
133 | extern int ira_loop_tree_height; | |
134 | ||
135 | /* All nodes representing basic blocks are referred through the | |
136 | following array. We can not use basic block member `aux' for this | |
137 | because it is used for insertion of insns on edges. */ | |
138 | extern ira_loop_tree_node_t ira_bb_nodes; | |
139 | ||
140 | /* Two access macros to the nodes representing basic blocks. */ | |
141 | #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) | |
142 | #define IRA_BB_NODE_BY_INDEX(index) __extension__ \ | |
143 | (({ ira_loop_tree_node_t _node = (&ira_bb_nodes[index]); \ | |
144 | if (_node->children != NULL || _node->loop != NULL || _node->bb == NULL)\ | |
145 | { \ | |
146 | fprintf (stderr, \ | |
147 | "\n%s: %d: error in %s: it is not a block node\n", \ | |
148 | __FILE__, __LINE__, __FUNCTION__); \ | |
149 | gcc_unreachable (); \ | |
150 | } \ | |
151 | _node; })) | |
152 | #else | |
153 | #define IRA_BB_NODE_BY_INDEX(index) (&ira_bb_nodes[index]) | |
154 | #endif | |
155 | ||
156 | #define IRA_BB_NODE(bb) IRA_BB_NODE_BY_INDEX ((bb)->index) | |
157 | ||
158 | /* All nodes representing loops are referred through the following | |
159 | array. */ | |
160 | extern ira_loop_tree_node_t ira_loop_nodes; | |
161 | ||
162 | /* Two access macros to the nodes representing loops. */ | |
163 | #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) | |
164 | #define IRA_LOOP_NODE_BY_INDEX(index) __extension__ \ | |
165 | (({ ira_loop_tree_node_t const _node = (&ira_loop_nodes[index]);\ | |
166 | if (_node->children == NULL || _node->bb != NULL || _node->loop == NULL)\ | |
167 | { \ | |
168 | fprintf (stderr, \ | |
169 | "\n%s: %d: error in %s: it is not a loop node\n", \ | |
170 | __FILE__, __LINE__, __FUNCTION__); \ | |
171 | gcc_unreachable (); \ | |
172 | } \ | |
173 | _node; })) | |
174 | #else | |
175 | #define IRA_LOOP_NODE_BY_INDEX(index) (&ira_loop_nodes[index]) | |
176 | #endif | |
177 | ||
178 | #define IRA_LOOP_NODE(loop) IRA_LOOP_NODE_BY_INDEX ((loop)->num) | |
179 | ||
180 | \f | |
181 | ||
182 | /* The structure describes program points where a given allocno lives. | |
183 | To save memory we store allocno conflicts only for the same cover | |
184 | class allocnos which is enough to assign hard registers. To find | |
185 | conflicts for other allocnos (e.g. to assign stack memory slot) we | |
186 | use the live ranges. If the live ranges of two allocnos are | |
187 | intersected, the allocnos are in conflict. */ | |
188 | struct ira_allocno_live_range | |
189 | { | |
190 | /* Allocno whose live range is described by given structure. */ | |
191 | ira_allocno_t allocno; | |
192 | /* Program point range. */ | |
193 | int start, finish; | |
194 | /* Next structure describing program points where the allocno | |
195 | lives. */ | |
196 | allocno_live_range_t next; | |
197 | /* Pointer to structures with the same start/finish. */ | |
198 | allocno_live_range_t start_next, finish_next; | |
199 | }; | |
200 | ||
201 | /* Program points are enumerated by numbers from range | |
202 | 0..IRA_MAX_POINT-1. There are approximately two times more program | |
203 | points than insns. Program points are places in the program where | |
204 | liveness info can be changed. In most general case (there are more | |
205 | complicated cases too) some program points correspond to places | |
206 | where input operand dies and other ones correspond to places where | |
207 | output operands are born. */ | |
208 | extern int ira_max_point; | |
209 | ||
210 | /* Arrays of size IRA_MAX_POINT mapping a program point to the allocno | |
211 | live ranges with given start/finish point. */ | |
212 | extern allocno_live_range_t *ira_start_point_ranges, *ira_finish_point_ranges; | |
213 | ||
214 | /* A structure representing an allocno (allocation entity). Allocno | |
215 | represents a pseudo-register in an allocation region. If | |
216 | pseudo-register does not live in a region but it lives in the | |
217 | nested regions, it is represented in the region by special allocno | |
218 | called *cap*. There may be more one cap representing the same | |
219 | pseudo-register in region. It means that the corresponding | |
220 | pseudo-register lives in more one non-intersected subregion. */ | |
221 | struct ira_allocno | |
222 | { | |
223 | /* The allocno order number starting with 0. Each allocno has an | |
224 | unique number and the number is never changed for the | |
225 | allocno. */ | |
226 | int num; | |
227 | /* Regno for allocno or cap. */ | |
228 | int regno; | |
229 | /* Mode of the allocno which is the mode of the corresponding | |
230 | pseudo-register. */ | |
231 | enum machine_mode mode; | |
232 | /* Final rtx representation of the allocno. */ | |
233 | rtx reg; | |
234 | /* Hard register assigned to given allocno. Negative value means | |
235 | that memory was allocated to the allocno. During the reload, | |
236 | spilled allocno has value equal to the corresponding stack slot | |
237 | number (0, ...) - 2. Value -1 is used for allocnos spilled by the | |
238 | reload (at this point pseudo-register has only one allocno) which | |
239 | did not get stack slot yet. */ | |
240 | int hard_regno; | |
241 | /* Allocnos with the same regno are linked by the following member. | |
242 | Allocnos corresponding to inner loops are first in the list (it | |
243 | corresponds to depth-first traverse of the loops). */ | |
244 | ira_allocno_t next_regno_allocno; | |
245 | /* There may be different allocnos with the same regno in different | |
246 | regions. Allocnos are bound to the corresponding loop tree node. | |
247 | Pseudo-register may have only one regular allocno with given loop | |
248 | tree node but more than one cap (see comments above). */ | |
249 | ira_loop_tree_node_t loop_tree_node; | |
250 | /* Accumulated usage references of the allocno. Here and below, | |
251 | word 'accumulated' means info for given region and all nested | |
252 | subregions. In this case, 'accumulated' means sum of references | |
253 | of the corresponding pseudo-register in this region and in all | |
254 | nested subregions recursively. */ | |
255 | int nrefs; | |
256 | /* Accumulated frequency of usage of the allocno. */ | |
257 | int freq; | |
258 | /* Register class which should be used for allocation for given | |
259 | allocno. NO_REGS means that we should use memory. */ | |
260 | enum reg_class cover_class; | |
261 | /* Minimal accumulated cost of usage register of the cover class for | |
262 | the allocno. */ | |
263 | int cover_class_cost; | |
264 | /* Minimal accumulated, and updated costs of memory for the allocno. | |
265 | At the allocation start, the original and updated costs are | |
266 | equal. The updated cost may be changed after finishing | |
267 | allocation in a region and starting allocation in a subregion. | |
268 | The change reflects the cost of spill/restore code on the | |
269 | subregion border if we assign memory to the pseudo in the | |
270 | subregion. */ | |
271 | int memory_cost, updated_memory_cost; | |
272 | /* Accumulated number of points where the allocno lives and there is | |
273 | excess pressure for its class. Excess pressure for a register | |
274 | class at some point means that there are more allocnos of given | |
275 | register class living at the point than number of hard-registers | |
276 | of the class available for the allocation. */ | |
277 | int excess_pressure_points_num; | |
278 | /* Copies to other non-conflicting allocnos. The copies can | |
279 | represent move insn or potential move insn usually because of two | |
280 | operand insn constraints. */ | |
281 | ira_copy_t allocno_copies; | |
282 | /* It is a allocno (cap) representing given allocno on upper loop tree | |
283 | level. */ | |
284 | ira_allocno_t cap; | |
285 | /* It is a link to allocno (cap) on lower loop level represented by | |
286 | given cap. Null if given allocno is not a cap. */ | |
287 | ira_allocno_t cap_member; | |
288 | /* Coalesced allocnos form a cyclic list. One allocno given by | |
289 | FIRST_COALESCED_ALLOCNO represents all coalesced allocnos. The | |
290 | list is chained by NEXT_COALESCED_ALLOCNO. */ | |
291 | ira_allocno_t first_coalesced_allocno; | |
292 | ira_allocno_t next_coalesced_allocno; | |
293 | /* Pointer to structures describing at what program point the | |
294 | allocno lives. We always maintain the list in such way that *the | |
295 | ranges in the list are not intersected and ordered by decreasing | |
296 | their program points*. */ | |
297 | allocno_live_range_t live_ranges; | |
298 | /* Before building conflicts the two member values are | |
299 | correspondingly minimal and maximal points of the accumulated | |
300 | allocno live ranges. After building conflicts the values are | |
301 | correspondingly minimal and maximal conflict ids of allocnos with | |
302 | which given allocno can conflict. */ | |
303 | int min, max; | |
304 | /* The unique member value represents given allocno in conflict bit | |
305 | vectors. */ | |
306 | int conflict_id; | |
307 | /* Vector of accumulated conflicting allocnos with NULL end marker | |
308 | (if CONFLICT_VEC_P is true) or conflict bit vector otherwise. | |
309 | Only allocnos with the same cover class are in the vector or in | |
310 | the bit vector. */ | |
311 | void *conflict_allocno_array; | |
312 | /* Allocated size of the previous array. */ | |
313 | unsigned int conflict_allocno_array_size; | |
314 | /* Number of accumulated conflicts in the vector of conflicting | |
315 | allocnos. */ | |
316 | int conflict_allocnos_num; | |
317 | /* Initial and accumulated hard registers conflicting with this | |
318 | allocno and as a consequences can not be assigned to the allocno. | |
319 | All non-allocatable hard regs and hard regs of cover classes | |
320 | different from given allocno one are included in the sets. */ | |
321 | HARD_REG_SET conflict_hard_regs, total_conflict_hard_regs; | |
322 | /* Accumulated frequency of calls which given allocno | |
323 | intersects. */ | |
324 | int call_freq; | |
325 | /* Length of the previous array (number of the intersected calls). */ | |
326 | int calls_crossed_num; | |
327 | /* Non NULL if we remove restoring value from given allocno to | |
328 | MEM_OPTIMIZED_DEST at loop exit (see ira-emit.c) because the | |
329 | allocno value is not changed inside the loop. */ | |
330 | ira_allocno_t mem_optimized_dest; | |
331 | /* TRUE if the allocno assigned to memory was a destination of | |
332 | removed move (see ira-emit.c) at loop exit because the value of | |
333 | the corresponding pseudo-register is not changed inside the | |
334 | loop. */ | |
335 | unsigned int mem_optimized_dest_p : 1; | |
336 | /* TRUE if the corresponding pseudo-register has disjoint live | |
337 | ranges and the other allocnos of the pseudo-register except this | |
338 | one changed REG. */ | |
339 | unsigned int somewhere_renamed_p : 1; | |
340 | /* TRUE if allocno with the same REGNO in a subregion has been | |
341 | renamed, in other words, got a new pseudo-register. */ | |
342 | unsigned int child_renamed_p : 1; | |
343 | /* During the reload, value TRUE means that we should not reassign a | |
344 | hard register to the allocno got memory earlier. It is set up | |
345 | when we removed memory-memory move insn before each iteration of | |
346 | the reload. */ | |
347 | unsigned int dont_reassign_p : 1; | |
348 | #ifdef STACK_REGS | |
349 | /* Set to TRUE if allocno can't be assigned to the stack hard | |
350 | register correspondingly in this region and area including the | |
351 | region and all its subregions recursively. */ | |
352 | unsigned int no_stack_reg_p : 1, total_no_stack_reg_p : 1; | |
353 | #endif | |
354 | /* TRUE value means that the allocno was not removed yet from the | |
355 | conflicting graph during colouring. */ | |
356 | unsigned int in_graph_p : 1; | |
357 | /* TRUE if a hard register or memory has been assigned to the | |
358 | allocno. */ | |
359 | unsigned int assigned_p : 1; | |
360 | /* TRUE if it is put on the stack to make other allocnos | |
361 | colorable. */ | |
362 | unsigned int may_be_spilled_p : 1; | |
363 | /* TRUE if the allocno was removed from the splay tree used to | |
364 | choose allocn for spilling (see ira-color.c::. */ | |
365 | unsigned int splay_removed_p : 1; | |
366 | /* TRUE if conflicts for given allocno are represented by vector of | |
367 | pointers to the conflicting allocnos. Otherwise, we use a bit | |
368 | vector where a bit with given index represents allocno with the | |
369 | same number. */ | |
370 | unsigned int conflict_vec_p : 1; | |
371 | /* Array of usage costs (accumulated and the one updated during | |
372 | coloring) for each hard register of the allocno cover class. The | |
373 | member value can be NULL if all costs are the same and equal to | |
374 | COVER_CLASS_COST. For example, the costs of two different hard | |
375 | registers can be different if one hard register is callee-saved | |
376 | and another one is callee-used and the allocno lives through | |
377 | calls. Another example can be case when for some insn the | |
378 | corresponding pseudo-register value should be put in specific | |
379 | register class (e.g. AREG for x86) which is a strict subset of | |
380 | the allocno cover class (GENERAL_REGS for x86). We have updated | |
381 | costs to reflect the situation when the usage cost of a hard | |
382 | register is decreased because the allocno is connected to another | |
383 | allocno by a copy and the another allocno has been assigned to | |
384 | the hard register. */ | |
385 | int *hard_reg_costs, *updated_hard_reg_costs; | |
386 | /* Array of decreasing costs (accumulated and the one updated during | |
387 | coloring) for allocnos conflicting with given allocno for hard | |
388 | regno of the allocno cover class. The member value can be NULL | |
389 | if all costs are the same. These costs are used to reflect | |
390 | preferences of other allocnos not assigned yet during assigning | |
391 | to given allocno. */ | |
392 | int *conflict_hard_reg_costs, *updated_conflict_hard_reg_costs; | |
393 | /* Number of the same cover class allocnos with TRUE in_graph_p | |
394 | value and conflicting with given allocno during each point of | |
395 | graph coloring. */ | |
396 | int left_conflicts_num; | |
397 | /* Number of hard registers of the allocno cover class really | |
398 | available for the allocno allocation. */ | |
399 | int available_regs_num; | |
400 | /* Allocnos in a bucket (used in coloring) chained by the following | |
401 | two members. */ | |
402 | ira_allocno_t next_bucket_allocno; | |
403 | ira_allocno_t prev_bucket_allocno; | |
404 | /* Used for temporary purposes. */ | |
405 | int temp; | |
406 | }; | |
407 | ||
408 | /* All members of the allocno structures should be accessed only | |
409 | through the following macros. */ | |
410 | #define ALLOCNO_NUM(A) ((A)->num) | |
411 | #define ALLOCNO_REGNO(A) ((A)->regno) | |
412 | #define ALLOCNO_REG(A) ((A)->reg) | |
413 | #define ALLOCNO_NEXT_REGNO_ALLOCNO(A) ((A)->next_regno_allocno) | |
414 | #define ALLOCNO_LOOP_TREE_NODE(A) ((A)->loop_tree_node) | |
415 | #define ALLOCNO_CAP(A) ((A)->cap) | |
416 | #define ALLOCNO_CAP_MEMBER(A) ((A)->cap_member) | |
417 | #define ALLOCNO_CONFLICT_ALLOCNO_ARRAY(A) ((A)->conflict_allocno_array) | |
418 | #define ALLOCNO_CONFLICT_ALLOCNO_ARRAY_SIZE(A) \ | |
419 | ((A)->conflict_allocno_array_size) | |
420 | #define ALLOCNO_CONFLICT_ALLOCNOS_NUM(A) \ | |
421 | ((A)->conflict_allocnos_num) | |
422 | #define ALLOCNO_CONFLICT_HARD_REGS(A) ((A)->conflict_hard_regs) | |
423 | #define ALLOCNO_TOTAL_CONFLICT_HARD_REGS(A) ((A)->total_conflict_hard_regs) | |
424 | #define ALLOCNO_NREFS(A) ((A)->nrefs) | |
425 | #define ALLOCNO_FREQ(A) ((A)->freq) | |
426 | #define ALLOCNO_HARD_REGNO(A) ((A)->hard_regno) | |
427 | #define ALLOCNO_CALL_FREQ(A) ((A)->call_freq) | |
428 | #define ALLOCNO_CALLS_CROSSED_NUM(A) ((A)->calls_crossed_num) | |
429 | #define ALLOCNO_MEM_OPTIMIZED_DEST(A) ((A)->mem_optimized_dest) | |
430 | #define ALLOCNO_MEM_OPTIMIZED_DEST_P(A) ((A)->mem_optimized_dest_p) | |
431 | #define ALLOCNO_SOMEWHERE_RENAMED_P(A) ((A)->somewhere_renamed_p) | |
432 | #define ALLOCNO_CHILD_RENAMED_P(A) ((A)->child_renamed_p) | |
433 | #define ALLOCNO_DONT_REASSIGN_P(A) ((A)->dont_reassign_p) | |
434 | #ifdef STACK_REGS | |
435 | #define ALLOCNO_NO_STACK_REG_P(A) ((A)->no_stack_reg_p) | |
436 | #define ALLOCNO_TOTAL_NO_STACK_REG_P(A) ((A)->total_no_stack_reg_p) | |
437 | #endif | |
438 | #define ALLOCNO_IN_GRAPH_P(A) ((A)->in_graph_p) | |
439 | #define ALLOCNO_ASSIGNED_P(A) ((A)->assigned_p) | |
440 | #define ALLOCNO_MAY_BE_SPILLED_P(A) ((A)->may_be_spilled_p) | |
441 | #define ALLOCNO_SPLAY_REMOVED_P(A) ((A)->splay_removed_p) | |
442 | #define ALLOCNO_CONFLICT_VEC_P(A) ((A)->conflict_vec_p) | |
443 | #define ALLOCNO_MODE(A) ((A)->mode) | |
444 | #define ALLOCNO_COPIES(A) ((A)->allocno_copies) | |
445 | #define ALLOCNO_HARD_REG_COSTS(A) ((A)->hard_reg_costs) | |
446 | #define ALLOCNO_UPDATED_HARD_REG_COSTS(A) ((A)->updated_hard_reg_costs) | |
447 | #define ALLOCNO_CONFLICT_HARD_REG_COSTS(A) \ | |
448 | ((A)->conflict_hard_reg_costs) | |
449 | #define ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS(A) \ | |
450 | ((A)->updated_conflict_hard_reg_costs) | |
451 | #define ALLOCNO_LEFT_CONFLICTS_NUM(A) ((A)->left_conflicts_num) | |
452 | #define ALLOCNO_COVER_CLASS(A) ((A)->cover_class) | |
453 | #define ALLOCNO_COVER_CLASS_COST(A) ((A)->cover_class_cost) | |
454 | #define ALLOCNO_MEMORY_COST(A) ((A)->memory_cost) | |
455 | #define ALLOCNO_UPDATED_MEMORY_COST(A) ((A)->updated_memory_cost) | |
456 | #define ALLOCNO_EXCESS_PRESSURE_POINTS_NUM(A) ((A)->excess_pressure_points_num) | |
457 | #define ALLOCNO_AVAILABLE_REGS_NUM(A) ((A)->available_regs_num) | |
458 | #define ALLOCNO_NEXT_BUCKET_ALLOCNO(A) ((A)->next_bucket_allocno) | |
459 | #define ALLOCNO_PREV_BUCKET_ALLOCNO(A) ((A)->prev_bucket_allocno) | |
460 | #define IRA_ALLOCNO_TEMP(A) ((A)->temp) | |
461 | #define ALLOCNO_FIRST_COALESCED_ALLOCNO(A) ((A)->first_coalesced_allocno) | |
462 | #define ALLOCNO_NEXT_COALESCED_ALLOCNO(A) ((A)->next_coalesced_allocno) | |
463 | #define ALLOCNO_LIVE_RANGES(A) ((A)->live_ranges) | |
464 | #define ALLOCNO_MIN(A) ((A)->min) | |
465 | #define ALLOCNO_MAX(A) ((A)->max) | |
466 | #define ALLOCNO_CONFLICT_ID(A) ((A)->conflict_id) | |
467 | ||
468 | /* Map regno -> allocnos with given regno (see comments for | |
469 | allocno member `next_regno_allocno'). */ | |
470 | extern ira_allocno_t *ira_regno_allocno_map; | |
471 | ||
472 | /* Array of references to all allocnos. The order number of the | |
473 | allocno corresponds to the index in the array. Removed allocnos | |
474 | have NULL element value. */ | |
475 | extern ira_allocno_t *ira_allocnos; | |
476 | ||
477 | /* Sizes of the previous array. */ | |
478 | extern int ira_allocnos_num; | |
479 | ||
480 | /* Map conflict id -> allocno with given conflict id (see comments for | |
481 | allocno member `conflict_id'). */ | |
482 | extern ira_allocno_t *ira_conflict_id_allocno_map; | |
483 | ||
484 | /* The following structure represents a copy of two allocnos. The | |
485 | copies represent move insns or potential move insns usually because | |
486 | of two operand insn constraints. To remove register shuffle, we | |
487 | also create copies between allocno which is output of an insn and | |
488 | allocno becoming dead in the insn. */ | |
489 | struct ira_allocno_copy | |
490 | { | |
491 | /* The unique order number of the copy node starting with 0. */ | |
492 | int num; | |
493 | /* Allocnos connected by the copy. The first allocno should have | |
494 | smaller order number than the second one. */ | |
495 | ira_allocno_t first, second; | |
496 | /* Execution frequency of the copy. */ | |
497 | int freq; | |
498 | /* It is a move insn which is an origin of the copy. The member | |
499 | value for the copy representing two operand insn constraints or | |
500 | for the copy created to remove register shuffle is NULL. In last | |
501 | case the copy frequency is smaller than the corresponding insn | |
502 | execution frequency. */ | |
503 | rtx insn; | |
504 | /* All copies with the same allocno as FIRST are linked by the two | |
505 | following members. */ | |
506 | ira_copy_t prev_first_allocno_copy, next_first_allocno_copy; | |
507 | /* All copies with the same allocno as SECOND are linked by the two | |
508 | following members. */ | |
509 | ira_copy_t prev_second_allocno_copy, next_second_allocno_copy; | |
510 | /* Region from which given copy is originated. */ | |
511 | ira_loop_tree_node_t loop_tree_node; | |
512 | }; | |
513 | ||
514 | /* Array of references to all copies. The order number of the copy | |
515 | corresponds to the index in the array. Removed copies have NULL | |
516 | element value. */ | |
517 | extern ira_copy_t *ira_copies; | |
518 | ||
519 | /* Size of the previous array. */ | |
520 | extern int ira_copies_num; | |
521 | ||
522 | /* The following structure describes a stack slot used for spilled | |
523 | pseudo-registers. */ | |
524 | struct ira_spilled_reg_stack_slot | |
525 | { | |
526 | /* pseudo-registers assigned to the stack slot. */ | |
527 | regset_head spilled_regs; | |
528 | /* RTL representation of the stack slot. */ | |
529 | rtx mem; | |
530 | /* Size of the stack slot. */ | |
531 | unsigned int width; | |
532 | }; | |
533 | ||
534 | /* The number of elements in the following array. */ | |
535 | extern int ira_spilled_reg_stack_slots_num; | |
536 | ||
537 | /* The following array contains info about spilled pseudo-registers | |
538 | stack slots used in current function so far. */ | |
539 | extern struct ira_spilled_reg_stack_slot *ira_spilled_reg_stack_slots; | |
540 | ||
541 | /* Correspondingly overall cost of the allocation, cost of the | |
542 | allocnos assigned to hard-registers, cost of the allocnos assigned | |
543 | to memory, cost of loads, stores and register move insns generated | |
544 | for pseudo-register live range splitting (see ira-emit.c). */ | |
545 | extern int ira_overall_cost; | |
546 | extern int ira_reg_cost, ira_mem_cost; | |
547 | extern int ira_load_cost, ira_store_cost, ira_shuffle_cost; | |
548 | extern int ira_move_loops_num, ira_additional_jumps_num; | |
549 | ||
550 | /* Map: register class x machine mode -> number of hard registers of | |
551 | given class needed to store value of given mode. If the number for | |
552 | some hard-registers of the register class is different, the size | |
553 | will be negative. */ | |
554 | extern int ira_reg_class_nregs[N_REG_CLASSES][MAX_MACHINE_MODE]; | |
555 | ||
556 | /* Maximal value of the previous array elements. */ | |
557 | extern int ira_max_nregs; | |
558 | ||
559 | /* The number of bits in each element of array used to implement a bit | |
560 | vector of allocnos and what type that element has. We use the | |
561 | largest integer format on the host machine. */ | |
562 | #define IRA_INT_BITS HOST_BITS_PER_WIDE_INT | |
563 | #define IRA_INT_TYPE HOST_WIDE_INT | |
564 | ||
565 | /* Set, clear or test bit number I in R, a bit vector of elements with | |
566 | minimal index and maximal index equal correspondingly to MIN and | |
567 | MAX. */ | |
568 | #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) | |
569 | ||
570 | #define SET_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ | |
571 | (({ int _min = (MIN), _max = (MAX), _i = (I); \ | |
572 | if (_i < _min || _i > _max) \ | |
573 | { \ | |
574 | fprintf (stderr, \ | |
575 | "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ | |
576 | __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ | |
577 | gcc_unreachable (); \ | |
578 | } \ | |
579 | ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ | |
580 | |= ((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) | |
581 | ||
582 | ||
583 | #define CLEAR_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ | |
584 | (({ int _min = (MIN), _max = (MAX), _i = (I); \ | |
585 | if (_i < _min || _i > _max) \ | |
586 | { \ | |
587 | fprintf (stderr, \ | |
588 | "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ | |
589 | __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ | |
590 | gcc_unreachable (); \ | |
591 | } \ | |
592 | ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ | |
593 | &= ~((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) | |
594 | ||
595 | #define TEST_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ | |
596 | (({ int _min = (MIN), _max = (MAX), _i = (I); \ | |
597 | if (_i < _min || _i > _max) \ | |
598 | { \ | |
599 | fprintf (stderr, \ | |
600 | "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ | |
601 | __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ | |
602 | gcc_unreachable (); \ | |
603 | } \ | |
604 | ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ | |
605 | & ((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) | |
606 | ||
607 | #else | |
608 | ||
609 | #define SET_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ | |
610 | ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ | |
611 | |= ((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) | |
612 | ||
613 | #define CLEAR_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ | |
614 | ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ | |
615 | &= ~((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) | |
616 | ||
617 | #define TEST_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ | |
618 | ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ | |
619 | & ((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) | |
620 | ||
621 | #endif | |
622 | ||
623 | /* The iterator for allocno set implemented ed as allocno bit | |
624 | vector. */ | |
625 | typedef struct { | |
626 | ||
627 | /* Array containing the allocno bit vector. */ | |
628 | IRA_INT_TYPE *vec; | |
629 | ||
630 | /* The number of the current element in the vector. */ | |
631 | unsigned int word_num; | |
632 | ||
633 | /* The number of bits in the bit vector. */ | |
634 | unsigned int nel; | |
635 | ||
636 | /* The current bit index of the bit vector. */ | |
637 | unsigned int bit_num; | |
638 | ||
639 | /* Index corresponding to the 1st bit of the bit vector. */ | |
640 | int start_val; | |
641 | ||
642 | /* The word of the bit vector currently visited. */ | |
643 | unsigned IRA_INT_TYPE word; | |
644 | } ira_allocno_set_iterator; | |
645 | ||
646 | /* Initialize the iterator I for allocnos bit vector VEC containing | |
647 | minimal and maximal values MIN and MAX. */ | |
648 | static inline void | |
649 | ira_allocno_set_iter_init (ira_allocno_set_iterator *i, | |
650 | IRA_INT_TYPE *vec, int min, int max) | |
651 | { | |
652 | i->vec = vec; | |
653 | i->word_num = 0; | |
654 | i->nel = max < min ? 0 : max - min + 1; | |
655 | i->start_val = min; | |
656 | i->bit_num = 0; | |
657 | i->word = i->nel == 0 ? 0 : vec[0]; | |
658 | } | |
659 | ||
660 | /* Return TRUE if we have more allocnos to visit, in which case *N is | |
661 | set to the allocno number to be visited. Otherwise, return | |
662 | FALSE. */ | |
663 | static inline bool | |
664 | ira_allocno_set_iter_cond (ira_allocno_set_iterator *i, int *n) | |
665 | { | |
666 | /* Skip words that are zeros. */ | |
667 | for (; i->word == 0; i->word = i->vec[i->word_num]) | |
668 | { | |
669 | i->word_num++; | |
670 | i->bit_num = i->word_num * IRA_INT_BITS; | |
671 | ||
672 | /* If we have reached the end, break. */ | |
673 | if (i->bit_num >= i->nel) | |
674 | return false; | |
675 | } | |
676 | ||
677 | /* Skip bits that are zero. */ | |
678 | for (; (i->word & 1) == 0; i->word >>= 1) | |
679 | i->bit_num++; | |
680 | ||
681 | *n = (int) i->bit_num + i->start_val; | |
682 | ||
683 | return true; | |
684 | } | |
685 | ||
686 | /* Advance to the next allocno in the set. */ | |
687 | static inline void | |
688 | ira_allocno_set_iter_next (ira_allocno_set_iterator *i) | |
689 | { | |
690 | i->word >>= 1; | |
691 | i->bit_num++; | |
692 | } | |
693 | ||
694 | /* Loop over all elements of allocno set given by bit vector VEC and | |
695 | their minimal and maximal values MIN and MAX. In each iteration, N | |
696 | is set to the number of next allocno. ITER is an instance of | |
697 | ira_allocno_set_iterator used to iterate the allocnos in the set. */ | |
698 | #define FOR_EACH_ALLOCNO_IN_SET(VEC, MIN, MAX, N, ITER) \ | |
699 | for (ira_allocno_set_iter_init (&(ITER), (VEC), (MIN), (MAX)); \ | |
700 | ira_allocno_set_iter_cond (&(ITER), &(N)); \ | |
701 | ira_allocno_set_iter_next (&(ITER))) | |
702 | ||
703 | /* ira.c: */ | |
704 | ||
705 | /* Hard regsets whose all bits are correspondingly zero or one. */ | |
706 | extern HARD_REG_SET ira_zero_hard_reg_set; | |
707 | extern HARD_REG_SET ira_one_hard_reg_set; | |
708 | ||
709 | /* Map: hard regs X modes -> set of hard registers for storing value | |
710 | of given mode starting with given hard register. */ | |
711 | extern HARD_REG_SET ira_reg_mode_hard_regset | |
712 | [FIRST_PSEUDO_REGISTER][NUM_MACHINE_MODES]; | |
713 | ||
714 | /* Arrays analogous to macros MEMORY_MOVE_COST and | |
715 | REGISTER_MOVE_COST. */ | |
716 | extern short ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2]; | |
717 | extern move_table *ira_register_move_cost[MAX_MACHINE_MODE]; | |
718 | ||
719 | /* Similar to may_move_in_cost but it is calculated in IRA instead of | |
720 | regclass. Another difference we take only available hard registers | |
721 | into account to figure out that one register class is a subset of | |
722 | the another one. */ | |
723 | extern move_table *ira_may_move_in_cost[MAX_MACHINE_MODE]; | |
724 | ||
725 | /* Similar to may_move_out_cost but it is calculated in IRA instead of | |
726 | regclass. Another difference we take only available hard registers | |
727 | into account to figure out that one register class is a subset of | |
728 | the another one. */ | |
729 | extern move_table *ira_may_move_out_cost[MAX_MACHINE_MODE]; | |
730 | ||
731 | /* Register class subset relation: TRUE if the first class is a subset | |
732 | of the second one considering only hard registers available for the | |
733 | allocation. */ | |
734 | extern int ira_class_subset_p[N_REG_CLASSES][N_REG_CLASSES]; | |
735 | ||
736 | /* Array of number of hard registers of given class which are | |
737 | available for the allocation. The order is defined by the | |
738 | allocation order. */ | |
739 | extern short ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER]; | |
740 | ||
741 | /* The number of elements of the above array for given register | |
742 | class. */ | |
743 | extern int ira_class_hard_regs_num[N_REG_CLASSES]; | |
744 | ||
745 | /* Index (in ira_class_hard_regs) for given register class and hard | |
746 | register (in general case a hard register can belong to several | |
747 | register classes). The index is negative for hard registers | |
748 | unavailable for the allocation. */ | |
749 | extern short ira_class_hard_reg_index[N_REG_CLASSES][FIRST_PSEUDO_REGISTER]; | |
750 | ||
751 | /* Function specific hard registers can not be used for the register | |
752 | allocation. */ | |
753 | extern HARD_REG_SET ira_no_alloc_regs; | |
754 | ||
755 | /* Number of given class hard registers available for the register | |
756 | allocation for given classes. */ | |
757 | extern int ira_available_class_regs[N_REG_CLASSES]; | |
758 | ||
759 | /* Array whose values are hard regset of hard registers available for | |
760 | the allocation of given register class whose HARD_REGNO_MODE_OK | |
761 | values for given mode are zero. */ | |
762 | extern HARD_REG_SET prohibited_class_mode_regs | |
763 | [N_REG_CLASSES][NUM_MACHINE_MODES]; | |
764 | ||
765 | /* Array whose values are hard regset of hard registers for which | |
766 | move of the hard register in given mode into itself is | |
767 | prohibited. */ | |
768 | extern HARD_REG_SET ira_prohibited_mode_move_regs[NUM_MACHINE_MODES]; | |
769 | ||
770 | /* Number of cover classes. Cover classes is non-intersected register | |
771 | classes containing all hard-registers available for the | |
772 | allocation. */ | |
773 | extern int ira_reg_class_cover_size; | |
774 | ||
775 | /* The array containing cover classes (see also comments for macro | |
776 | IRA_COVER_CLASSES). Only first IRA_REG_CLASS_COVER_SIZE elements are | |
777 | used for this. */ | |
778 | extern enum reg_class ira_reg_class_cover[N_REG_CLASSES]; | |
779 | ||
780 | /* The value is number of elements in the subsequent array. */ | |
781 | extern int ira_important_classes_num; | |
782 | ||
783 | /* The array containing non-empty classes (including non-empty cover | |
784 | classes) which are subclasses of cover classes. Such classes is | |
785 | important for calculation of the hard register usage costs. */ | |
786 | extern enum reg_class ira_important_classes[N_REG_CLASSES]; | |
787 | ||
788 | /* The array containing indexes of important classes in the previous | |
789 | array. The array elements are defined only for important | |
790 | classes. */ | |
791 | extern int ira_important_class_nums[N_REG_CLASSES]; | |
792 | ||
793 | /* Map of all register classes to corresponding cover class containing | |
794 | the given class. If given class is not a subset of a cover class, | |
795 | we translate it into the cheapest cover class. */ | |
796 | extern enum reg_class ira_class_translate[N_REG_CLASSES]; | |
797 | ||
798 | /* The biggest important class inside of intersection of the two | |
799 | classes (that is calculated taking only hard registers available | |
800 | for allocation into account). If the both classes contain no hard | |
801 | registers available for allocation, the value is calculated with | |
802 | taking all hard-registers including fixed ones into account. */ | |
803 | extern enum reg_class ira_reg_class_intersect[N_REG_CLASSES][N_REG_CLASSES]; | |
804 | ||
805 | /* The biggest important class inside of union of the two classes | |
806 | (that is calculated taking only hard registers available for | |
807 | allocation into account). If the both classes contain no hard | |
808 | registers available for allocation, the value is calculated with | |
809 | taking all hard-registers including fixed ones into account. In | |
810 | other words, the value is the corresponding reg_class_subunion | |
811 | value. */ | |
812 | extern enum reg_class ira_reg_class_union[N_REG_CLASSES][N_REG_CLASSES]; | |
813 | ||
814 | extern void *ira_allocate (size_t); | |
815 | extern void *ira_reallocate (void *, size_t); | |
816 | extern void ira_free (void *addr); | |
817 | extern bitmap ira_allocate_bitmap (void); | |
818 | extern void ira_free_bitmap (bitmap); | |
819 | extern void ira_print_disposition (FILE *); | |
820 | extern void ira_debug_disposition (void); | |
821 | extern void ira_debug_class_cover (void); | |
822 | extern void ira_init_register_move_cost (enum machine_mode); | |
823 | ||
824 | /* The length of the two following arrays. */ | |
825 | extern int ira_reg_equiv_len; | |
826 | ||
827 | /* The element value is TRUE if the corresponding regno value is | |
828 | invariant. */ | |
829 | extern bool *ira_reg_equiv_invariant_p; | |
830 | ||
831 | /* The element value is equiv constant of given pseudo-register or | |
832 | NULL_RTX. */ | |
833 | extern rtx *ira_reg_equiv_const; | |
834 | ||
835 | /* ira-build.c */ | |
836 | ||
837 | /* The current loop tree node and its regno allocno map. */ | |
838 | extern ira_loop_tree_node_t ira_curr_loop_tree_node; | |
839 | extern ira_allocno_t *ira_curr_regno_allocno_map; | |
840 | ||
841 | extern void ira_debug_allocno_copies (ira_allocno_t); | |
842 | ||
843 | extern void ira_traverse_loop_tree (bool, ira_loop_tree_node_t, | |
844 | void (*) (ira_loop_tree_node_t), | |
845 | void (*) (ira_loop_tree_node_t)); | |
846 | extern ira_allocno_t ira_create_allocno (int, bool, ira_loop_tree_node_t); | |
847 | extern void ira_set_allocno_cover_class (ira_allocno_t, enum reg_class); | |
848 | extern bool ira_conflict_vector_profitable_p (ira_allocno_t, int); | |
849 | extern void ira_allocate_allocno_conflict_vec (ira_allocno_t, int); | |
850 | extern void ira_allocate_allocno_conflicts (ira_allocno_t, int); | |
851 | extern void ira_add_allocno_conflict (ira_allocno_t, ira_allocno_t); | |
852 | extern void ira_print_expanded_allocno (ira_allocno_t); | |
853 | extern allocno_live_range_t ira_create_allocno_live_range | |
854 | (ira_allocno_t, int, int, allocno_live_range_t); | |
855 | extern void ira_finish_allocno_live_range (allocno_live_range_t); | |
856 | extern void ira_free_allocno_updated_costs (ira_allocno_t); | |
857 | extern ira_copy_t ira_create_copy (ira_allocno_t, ira_allocno_t, | |
858 | int, rtx, ira_loop_tree_node_t); | |
859 | extern void ira_add_allocno_copy_to_list (ira_copy_t); | |
860 | extern void ira_swap_allocno_copy_ends_if_necessary (ira_copy_t); | |
861 | extern void ira_remove_allocno_copy_from_list (ira_copy_t); | |
862 | extern ira_copy_t ira_add_allocno_copy (ira_allocno_t, ira_allocno_t, int, rtx, | |
863 | ira_loop_tree_node_t); | |
864 | ||
865 | extern int *ira_allocate_cost_vector (enum reg_class); | |
866 | extern void ira_free_cost_vector (int *, enum reg_class); | |
867 | ||
868 | extern void ira_flattening (int, int); | |
869 | extern bool ira_build (bool); | |
870 | extern void ira_destroy (void); | |
871 | ||
872 | /* ira-costs.c */ | |
873 | extern void ira_init_costs_once (void); | |
874 | extern void ira_init_costs (void); | |
875 | extern void ira_finish_costs_once (void); | |
876 | extern void ira_costs (void); | |
877 | extern void ira_tune_allocno_costs_and_cover_classes (void); | |
878 | ||
879 | /* ira-lives.c */ | |
880 | ||
881 | extern void ira_rebuild_start_finish_chains (void); | |
882 | extern void ira_print_live_range_list (FILE *, allocno_live_range_t); | |
883 | extern void ira_debug_live_range_list (allocno_live_range_t); | |
884 | extern void ira_debug_allocno_live_ranges (ira_allocno_t); | |
885 | extern void ira_debug_live_ranges (void); | |
886 | extern void ira_create_allocno_live_ranges (void); | |
887 | extern void ira_finish_allocno_live_ranges (void); | |
888 | ||
889 | /* ira-conflicts.c */ | |
890 | extern bool ira_allocno_live_ranges_intersect_p (ira_allocno_t, ira_allocno_t); | |
891 | extern bool ira_pseudo_live_ranges_intersect_p (int, int); | |
892 | extern void ira_debug_conflicts (bool); | |
893 | extern void ira_build_conflicts (void); | |
894 | ||
895 | /* ira-color.c */ | |
896 | extern int ira_loop_edge_freq (ira_loop_tree_node_t, int, bool); | |
897 | extern void ira_reassign_conflict_allocnos (int); | |
898 | extern void ira_initiate_assign (void); | |
899 | extern void ira_finish_assign (void); | |
900 | extern void ira_color (void); | |
901 | extern void ira_fast_allocation (void); | |
902 | ||
903 | /* ira-emit.c */ | |
904 | extern void ira_emit (bool); | |
905 | ||
906 | \f | |
907 | ||
908 | /* The iterator for all allocnos. */ | |
909 | typedef struct { | |
910 | /* The number of the current element in IRA_ALLOCNOS. */ | |
911 | int n; | |
912 | } ira_allocno_iterator; | |
913 | ||
914 | /* Initialize the iterator I. */ | |
915 | static inline void | |
916 | ira_allocno_iter_init (ira_allocno_iterator *i) | |
917 | { | |
918 | i->n = 0; | |
919 | } | |
920 | ||
921 | /* Return TRUE if we have more allocnos to visit, in which case *A is | |
922 | set to the allocno to be visited. Otherwise, return FALSE. */ | |
923 | static inline bool | |
924 | ira_allocno_iter_cond (ira_allocno_iterator *i, ira_allocno_t *a) | |
925 | { | |
926 | int n; | |
927 | ||
928 | for (n = i->n; n < ira_allocnos_num; n++) | |
929 | if (ira_allocnos[n] != NULL) | |
930 | { | |
931 | *a = ira_allocnos[n]; | |
932 | i->n = n + 1; | |
933 | return true; | |
934 | } | |
935 | return false; | |
936 | } | |
937 | ||
938 | /* Loop over all allocnos. In each iteration, A is set to the next | |
939 | allocno. ITER is an instance of ira_allocno_iterator used to iterate | |
940 | the allocnos. */ | |
941 | #define FOR_EACH_ALLOCNO(A, ITER) \ | |
942 | for (ira_allocno_iter_init (&(ITER)); \ | |
943 | ira_allocno_iter_cond (&(ITER), &(A));) | |
944 | ||
945 | ||
946 | \f | |
947 | ||
948 | /* The iterator for copies. */ | |
949 | typedef struct { | |
950 | /* The number of the current element in IRA_COPIES. */ | |
951 | int n; | |
952 | } ira_copy_iterator; | |
953 | ||
954 | /* Initialize the iterator I. */ | |
955 | static inline void | |
956 | ira_copy_iter_init (ira_copy_iterator *i) | |
957 | { | |
958 | i->n = 0; | |
959 | } | |
960 | ||
961 | /* Return TRUE if we have more copies to visit, in which case *CP is | |
962 | set to the copy to be visited. Otherwise, return FALSE. */ | |
963 | static inline bool | |
964 | ira_copy_iter_cond (ira_copy_iterator *i, ira_copy_t *cp) | |
965 | { | |
966 | int n; | |
967 | ||
968 | for (n = i->n; n < ira_copies_num; n++) | |
969 | if (ira_copies[n] != NULL) | |
970 | { | |
971 | *cp = ira_copies[n]; | |
972 | i->n = n + 1; | |
973 | return true; | |
974 | } | |
975 | return false; | |
976 | } | |
977 | ||
978 | /* Loop over all copies. In each iteration, C is set to the next | |
979 | copy. ITER is an instance of ira_copy_iterator used to iterate | |
980 | the copies. */ | |
981 | #define FOR_EACH_COPY(C, ITER) \ | |
982 | for (ira_copy_iter_init (&(ITER)); \ | |
983 | ira_copy_iter_cond (&(ITER), &(C));) | |
984 | ||
985 | ||
986 | \f | |
987 | ||
988 | /* The iterator for allocno conflicts. */ | |
989 | typedef struct { | |
990 | ||
991 | /* TRUE if the conflicts are represented by vector of allocnos. */ | |
992 | bool allocno_conflict_vec_p; | |
993 | ||
994 | /* The conflict vector or conflict bit vector. */ | |
995 | void *vec; | |
996 | ||
997 | /* The number of the current element in the vector (of type | |
998 | ira_allocno_t or IRA_INT_TYPE). */ | |
999 | unsigned int word_num; | |
1000 | ||
1001 | /* The bit vector size. It is defined only if | |
1002 | ALLOCNO_CONFLICT_VEC_P is FALSE. */ | |
1003 | unsigned int size; | |
1004 | ||
1005 | /* The current bit index of bit vector. It is defined only if | |
1006 | ALLOCNO_CONFLICT_VEC_P is FALSE. */ | |
1007 | unsigned int bit_num; | |
1008 | ||
1009 | /* Allocno conflict id corresponding to the 1st bit of the bit | |
1010 | vector. It is defined only if ALLOCNO_CONFLICT_VEC_P is | |
1011 | FALSE. */ | |
1012 | int base_conflict_id; | |
1013 | ||
1014 | /* The word of bit vector currently visited. It is defined only if | |
1015 | ALLOCNO_CONFLICT_VEC_P is FALSE. */ | |
1016 | unsigned IRA_INT_TYPE word; | |
1017 | } ira_allocno_conflict_iterator; | |
1018 | ||
1019 | /* Initialize the iterator I with ALLOCNO conflicts. */ | |
1020 | static inline void | |
1021 | ira_allocno_conflict_iter_init (ira_allocno_conflict_iterator *i, | |
1022 | ira_allocno_t allocno) | |
1023 | { | |
1024 | i->allocno_conflict_vec_p = ALLOCNO_CONFLICT_VEC_P (allocno); | |
1025 | i->vec = ALLOCNO_CONFLICT_ALLOCNO_ARRAY (allocno); | |
1026 | i->word_num = 0; | |
1027 | if (i->allocno_conflict_vec_p) | |
1028 | i->size = i->bit_num = i->base_conflict_id = i->word = 0; | |
1029 | else | |
1030 | { | |
1031 | if (ALLOCNO_MIN (allocno) > ALLOCNO_MAX (allocno)) | |
1032 | i->size = 0; | |
1033 | else | |
1034 | i->size = ((ALLOCNO_MAX (allocno) - ALLOCNO_MIN (allocno) | |
1035 | + IRA_INT_BITS) | |
1036 | / IRA_INT_BITS) * sizeof (IRA_INT_TYPE); | |
1037 | i->bit_num = 0; | |
1038 | i->base_conflict_id = ALLOCNO_MIN (allocno); | |
1039 | i->word = (i->size == 0 ? 0 : ((IRA_INT_TYPE *) i->vec)[0]); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* Return TRUE if we have more conflicting allocnos to visit, in which | |
1044 | case *A is set to the allocno to be visited. Otherwise, return | |
1045 | FALSE. */ | |
1046 | static inline bool | |
1047 | ira_allocno_conflict_iter_cond (ira_allocno_conflict_iterator *i, | |
1048 | ira_allocno_t *a) | |
1049 | { | |
1050 | ira_allocno_t conflict_allocno; | |
1051 | ||
1052 | if (i->allocno_conflict_vec_p) | |
1053 | { | |
1054 | conflict_allocno = ((ira_allocno_t *) i->vec)[i->word_num]; | |
1055 | if (conflict_allocno == NULL) | |
1056 | return false; | |
1057 | *a = conflict_allocno; | |
1058 | return true; | |
1059 | } | |
1060 | else | |
1061 | { | |
1062 | /* Skip words that are zeros. */ | |
1063 | for (; i->word == 0; i->word = ((IRA_INT_TYPE *) i->vec)[i->word_num]) | |
1064 | { | |
1065 | i->word_num++; | |
1066 | ||
1067 | /* If we have reached the end, break. */ | |
1068 | if (i->word_num * sizeof (IRA_INT_TYPE) >= i->size) | |
1069 | return false; | |
1070 | ||
1071 | i->bit_num = i->word_num * IRA_INT_BITS; | |
1072 | } | |
1073 | ||
1074 | /* Skip bits that are zero. */ | |
1075 | for (; (i->word & 1) == 0; i->word >>= 1) | |
1076 | i->bit_num++; | |
1077 | ||
1078 | *a = ira_conflict_id_allocno_map[i->bit_num + i->base_conflict_id]; | |
1079 | ||
1080 | return true; | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /* Advance to the next conflicting allocno. */ | |
1085 | static inline void | |
1086 | ira_allocno_conflict_iter_next (ira_allocno_conflict_iterator *i) | |
1087 | { | |
1088 | if (i->allocno_conflict_vec_p) | |
1089 | i->word_num++; | |
1090 | else | |
1091 | { | |
1092 | i->word >>= 1; | |
1093 | i->bit_num++; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | /* Loop over all allocnos conflicting with ALLOCNO. In each | |
1098 | iteration, A is set to the next conflicting allocno. ITER is an | |
1099 | instance of ira_allocno_conflict_iterator used to iterate the | |
1100 | conflicts. */ | |
1101 | #define FOR_EACH_ALLOCNO_CONFLICT(ALLOCNO, A, ITER) \ | |
1102 | for (ira_allocno_conflict_iter_init (&(ITER), (ALLOCNO)); \ | |
1103 | ira_allocno_conflict_iter_cond (&(ITER), &(A)); \ | |
1104 | ira_allocno_conflict_iter_next (&(ITER))) | |
1105 | ||
1106 | \f | |
1107 | ||
1108 | /* The function returns TRUE if hard registers starting with | |
1109 | HARD_REGNO and containing value of MODE are not in set | |
1110 | HARD_REGSET. */ | |
1111 | static inline bool | |
1112 | ira_hard_reg_not_in_set_p (int hard_regno, enum machine_mode mode, | |
1113 | HARD_REG_SET hard_regset) | |
1114 | { | |
1115 | int i; | |
1116 | ||
1117 | ira_assert (hard_regno >= 0); | |
1118 | for (i = hard_regno_nregs[hard_regno][mode] - 1; i >= 0; i--) | |
1119 | if (TEST_HARD_REG_BIT (hard_regset, hard_regno + i)) | |
1120 | return false; | |
1121 | return true; | |
1122 | } | |
1123 | ||
1124 | \f | |
1125 | ||
1126 | /* To save memory we use a lazy approach for allocation and | |
1127 | initialization of the cost vectors. We do this only when it is | |
1128 | really necessary. */ | |
1129 | ||
1130 | /* Allocate cost vector *VEC for hard registers of COVER_CLASS and | |
1131 | initialize the elements by VAL if it is necessary */ | |
1132 | static inline void | |
1133 | ira_allocate_and_set_costs (int **vec, enum reg_class cover_class, int val) | |
1134 | { | |
1135 | int i, *reg_costs; | |
1136 | int len; | |
1137 | ||
1138 | if (*vec != NULL) | |
1139 | return; | |
1140 | *vec = reg_costs = ira_allocate_cost_vector (cover_class); | |
1141 | len = ira_class_hard_regs_num[cover_class]; | |
1142 | for (i = 0; i < len; i++) | |
1143 | reg_costs[i] = val; | |
1144 | } | |
1145 | ||
1146 | /* Allocate cost vector *VEC for hard registers of COVER_CLASS and | |
1147 | copy values of vector SRC into the vector if it is necessary */ | |
1148 | static inline void | |
1149 | ira_allocate_and_copy_costs (int **vec, enum reg_class cover_class, int *src) | |
1150 | { | |
1151 | int len; | |
1152 | ||
1153 | if (*vec != NULL || src == NULL) | |
1154 | return; | |
1155 | *vec = ira_allocate_cost_vector (cover_class); | |
1156 | len = ira_class_hard_regs_num[cover_class]; | |
1157 | memcpy (*vec, src, sizeof (int) * len); | |
1158 | } | |
1159 | ||
1160 | /* Allocate cost vector *VEC for hard registers of COVER_CLASS and | |
1161 | add values of vector SRC into the vector if it is necessary */ | |
1162 | static inline void | |
1163 | ira_allocate_and_accumulate_costs (int **vec, enum reg_class cover_class, | |
1164 | int *src) | |
1165 | { | |
1166 | int i, len; | |
1167 | ||
1168 | if (src == NULL) | |
1169 | return; | |
1170 | len = ira_class_hard_regs_num[cover_class]; | |
1171 | if (*vec == NULL) | |
1172 | { | |
1173 | *vec = ira_allocate_cost_vector (cover_class); | |
1174 | memset (*vec, 0, sizeof (int) * len); | |
1175 | } | |
1176 | for (i = 0; i < len; i++) | |
1177 | (*vec)[i] += src[i]; | |
1178 | } | |
1179 | ||
1180 | /* Allocate cost vector *VEC for hard registers of COVER_CLASS and | |
1181 | copy values of vector SRC into the vector or initialize it by VAL | |
1182 | (if SRC is null). */ | |
1183 | static inline void | |
1184 | ira_allocate_and_set_or_copy_costs (int **vec, enum reg_class cover_class, | |
1185 | int val, int *src) | |
1186 | { | |
1187 | int i, *reg_costs; | |
1188 | int len; | |
1189 | ||
1190 | if (*vec != NULL) | |
1191 | return; | |
1192 | *vec = reg_costs = ira_allocate_cost_vector (cover_class); | |
1193 | len = ira_class_hard_regs_num[cover_class]; | |
1194 | if (src != NULL) | |
1195 | memcpy (reg_costs, src, sizeof (int) * len); | |
1196 | else | |
1197 | { | |
1198 | for (i = 0; i < len; i++) | |
1199 | reg_costs[i] = val; | |
1200 | } | |
1201 | } |