1 |
280 |
jeremybenn |
/* IRA allocation based on graph coloring.
|
2 |
|
|
Copyright (C) 2006, 2007, 2008, 2009, 2010
|
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 "config.h"
|
23 |
|
|
#include "system.h"
|
24 |
|
|
#include "coretypes.h"
|
25 |
|
|
#include "tm.h"
|
26 |
|
|
#include "rtl.h"
|
27 |
|
|
#include "tm_p.h"
|
28 |
|
|
#include "target.h"
|
29 |
|
|
#include "regs.h"
|
30 |
|
|
#include "flags.h"
|
31 |
|
|
#include "sbitmap.h"
|
32 |
|
|
#include "bitmap.h"
|
33 |
|
|
#include "hard-reg-set.h"
|
34 |
|
|
#include "basic-block.h"
|
35 |
|
|
#include "expr.h"
|
36 |
|
|
#include "toplev.h"
|
37 |
|
|
#include "reload.h"
|
38 |
|
|
#include "params.h"
|
39 |
|
|
#include "df.h"
|
40 |
|
|
#include "splay-tree.h"
|
41 |
|
|
#include "ira-int.h"
|
42 |
|
|
|
43 |
|
|
/* This file contains code for regional graph coloring, spill/restore
|
44 |
|
|
code placement optimization, and code helping the reload pass to do
|
45 |
|
|
a better job. */
|
46 |
|
|
|
47 |
|
|
/* Bitmap of allocnos which should be colored. */
|
48 |
|
|
static bitmap coloring_allocno_bitmap;
|
49 |
|
|
|
50 |
|
|
/* Bitmap of allocnos which should be taken into account during
|
51 |
|
|
coloring. In general case it contains allocnos from
|
52 |
|
|
coloring_allocno_bitmap plus other already colored conflicting
|
53 |
|
|
allocnos. */
|
54 |
|
|
static bitmap consideration_allocno_bitmap;
|
55 |
|
|
|
56 |
|
|
/* TRUE if we coalesced some allocnos. In other words, if we got
|
57 |
|
|
loops formed by members first_coalesced_allocno and
|
58 |
|
|
next_coalesced_allocno containing more one allocno. */
|
59 |
|
|
static bool allocno_coalesced_p;
|
60 |
|
|
|
61 |
|
|
/* Bitmap used to prevent a repeated allocno processing because of
|
62 |
|
|
coalescing. */
|
63 |
|
|
static bitmap processed_coalesced_allocno_bitmap;
|
64 |
|
|
|
65 |
|
|
/* All allocnos sorted according their priorities. */
|
66 |
|
|
static ira_allocno_t *sorted_allocnos;
|
67 |
|
|
|
68 |
|
|
/* Vec representing the stack of allocnos used during coloring. */
|
69 |
|
|
static VEC(ira_allocno_t,heap) *allocno_stack_vec;
|
70 |
|
|
|
71 |
|
|
/* Array used to choose an allocno for spilling. */
|
72 |
|
|
static ira_allocno_t *allocnos_for_spilling;
|
73 |
|
|
|
74 |
|
|
/* Pool for splay tree nodes. */
|
75 |
|
|
static alloc_pool splay_tree_node_pool;
|
76 |
|
|
|
77 |
|
|
/* When an allocno is removed from the splay tree, it is put in the
|
78 |
|
|
following vector for subsequent inserting it into the splay tree
|
79 |
|
|
after putting all colorable allocnos onto the stack. The allocno
|
80 |
|
|
could be removed from and inserted to the splay tree every time
|
81 |
|
|
when its spilling priority is changed but such solution would be
|
82 |
|
|
more costly although simpler. */
|
83 |
|
|
static VEC(ira_allocno_t,heap) *removed_splay_allocno_vec;
|
84 |
|
|
|
85 |
|
|
|
86 |
|
|
|
87 |
|
|
/* This page contains functions used to find conflicts using allocno
|
88 |
|
|
live ranges. */
|
89 |
|
|
|
90 |
|
|
/* Return TRUE if live ranges of allocnos A1 and A2 intersect. It is
|
91 |
|
|
used to find a conflict for new allocnos or allocnos with the
|
92 |
|
|
different cover classes. */
|
93 |
|
|
static bool
|
94 |
|
|
allocnos_have_intersected_live_ranges_p (ira_allocno_t a1, ira_allocno_t a2)
|
95 |
|
|
{
|
96 |
|
|
if (a1 == a2)
|
97 |
|
|
return false;
|
98 |
|
|
if (ALLOCNO_REG (a1) != NULL && ALLOCNO_REG (a2) != NULL
|
99 |
|
|
&& (ORIGINAL_REGNO (ALLOCNO_REG (a1))
|
100 |
|
|
== ORIGINAL_REGNO (ALLOCNO_REG (a2))))
|
101 |
|
|
return false;
|
102 |
|
|
return ira_allocno_live_ranges_intersect_p (ALLOCNO_LIVE_RANGES (a1),
|
103 |
|
|
ALLOCNO_LIVE_RANGES (a2));
|
104 |
|
|
}
|
105 |
|
|
|
106 |
|
|
#ifdef ENABLE_IRA_CHECKING
|
107 |
|
|
|
108 |
|
|
/* Return TRUE if live ranges of pseudo-registers REGNO1 and REGNO2
|
109 |
|
|
intersect. This should be used when there is only one region.
|
110 |
|
|
Currently this is used during reload. */
|
111 |
|
|
static bool
|
112 |
|
|
pseudos_have_intersected_live_ranges_p (int regno1, int regno2)
|
113 |
|
|
{
|
114 |
|
|
ira_allocno_t a1, a2;
|
115 |
|
|
|
116 |
|
|
ira_assert (regno1 >= FIRST_PSEUDO_REGISTER
|
117 |
|
|
&& regno2 >= FIRST_PSEUDO_REGISTER);
|
118 |
|
|
/* Reg info caclulated by dataflow infrastructure can be different
|
119 |
|
|
from one calculated by regclass. */
|
120 |
|
|
if ((a1 = ira_loop_tree_root->regno_allocno_map[regno1]) == NULL
|
121 |
|
|
|| (a2 = ira_loop_tree_root->regno_allocno_map[regno2]) == NULL)
|
122 |
|
|
return false;
|
123 |
|
|
return allocnos_have_intersected_live_ranges_p (a1, a2);
|
124 |
|
|
}
|
125 |
|
|
|
126 |
|
|
#endif
|
127 |
|
|
|
128 |
|
|
|
129 |
|
|
|
130 |
|
|
/* This page contains functions used to choose hard registers for
|
131 |
|
|
allocnos. */
|
132 |
|
|
|
133 |
|
|
/* Array whose element value is TRUE if the corresponding hard
|
134 |
|
|
register was already allocated for an allocno. */
|
135 |
|
|
static bool allocated_hardreg_p[FIRST_PSEUDO_REGISTER];
|
136 |
|
|
|
137 |
|
|
/* Describes one element in a queue of allocnos whose costs need to be
|
138 |
|
|
updated. Each allocno in the queue is known to have a cover class. */
|
139 |
|
|
struct update_cost_queue_elem
|
140 |
|
|
{
|
141 |
|
|
/* This element is in the queue iff CHECK == update_cost_check. */
|
142 |
|
|
int check;
|
143 |
|
|
|
144 |
|
|
/* COST_HOP_DIVISOR**N, where N is the length of the shortest path
|
145 |
|
|
connecting this allocno to the one being allocated. */
|
146 |
|
|
int divisor;
|
147 |
|
|
|
148 |
|
|
/* The next allocno in the queue, or null if this is the last element. */
|
149 |
|
|
ira_allocno_t next;
|
150 |
|
|
};
|
151 |
|
|
|
152 |
|
|
/* The first element in a queue of allocnos whose copy costs need to be
|
153 |
|
|
updated. Null if the queue is empty. */
|
154 |
|
|
static ira_allocno_t update_cost_queue;
|
155 |
|
|
|
156 |
|
|
/* The last element in the queue described by update_cost_queue.
|
157 |
|
|
Not valid if update_cost_queue is null. */
|
158 |
|
|
static struct update_cost_queue_elem *update_cost_queue_tail;
|
159 |
|
|
|
160 |
|
|
/* A pool of elements in the queue described by update_cost_queue.
|
161 |
|
|
Elements are indexed by ALLOCNO_NUM. */
|
162 |
|
|
static struct update_cost_queue_elem *update_cost_queue_elems;
|
163 |
|
|
|
164 |
|
|
/* The current value of update_copy_cost call count. */
|
165 |
|
|
static int update_cost_check;
|
166 |
|
|
|
167 |
|
|
/* Allocate and initialize data necessary for function
|
168 |
|
|
update_copy_costs. */
|
169 |
|
|
static void
|
170 |
|
|
initiate_cost_update (void)
|
171 |
|
|
{
|
172 |
|
|
size_t size;
|
173 |
|
|
|
174 |
|
|
size = ira_allocnos_num * sizeof (struct update_cost_queue_elem);
|
175 |
|
|
update_cost_queue_elems
|
176 |
|
|
= (struct update_cost_queue_elem *) ira_allocate (size);
|
177 |
|
|
memset (update_cost_queue_elems, 0, size);
|
178 |
|
|
update_cost_check = 0;
|
179 |
|
|
}
|
180 |
|
|
|
181 |
|
|
/* Deallocate data used by function update_copy_costs. */
|
182 |
|
|
static void
|
183 |
|
|
finish_cost_update (void)
|
184 |
|
|
{
|
185 |
|
|
ira_free (update_cost_queue_elems);
|
186 |
|
|
}
|
187 |
|
|
|
188 |
|
|
/* When we traverse allocnos to update hard register costs, the cost
|
189 |
|
|
divisor will be multiplied by the following macro value for each
|
190 |
|
|
hop from given allocno to directly connected allocnos. */
|
191 |
|
|
#define COST_HOP_DIVISOR 4
|
192 |
|
|
|
193 |
|
|
/* Start a new cost-updating pass. */
|
194 |
|
|
static void
|
195 |
|
|
start_update_cost (void)
|
196 |
|
|
{
|
197 |
|
|
update_cost_check++;
|
198 |
|
|
update_cost_queue = NULL;
|
199 |
|
|
}
|
200 |
|
|
|
201 |
|
|
/* Add (ALLOCNO, DIVISOR) to the end of update_cost_queue,
|
202 |
|
|
unless ALLOCNO is already in the queue, or has no cover class. */
|
203 |
|
|
static inline void
|
204 |
|
|
queue_update_cost (ira_allocno_t allocno, int divisor)
|
205 |
|
|
{
|
206 |
|
|
struct update_cost_queue_elem *elem;
|
207 |
|
|
|
208 |
|
|
elem = &update_cost_queue_elems[ALLOCNO_NUM (allocno)];
|
209 |
|
|
if (elem->check != update_cost_check
|
210 |
|
|
&& ALLOCNO_COVER_CLASS (allocno) != NO_REGS)
|
211 |
|
|
{
|
212 |
|
|
elem->check = update_cost_check;
|
213 |
|
|
elem->divisor = divisor;
|
214 |
|
|
elem->next = NULL;
|
215 |
|
|
if (update_cost_queue == NULL)
|
216 |
|
|
update_cost_queue = allocno;
|
217 |
|
|
else
|
218 |
|
|
update_cost_queue_tail->next = allocno;
|
219 |
|
|
update_cost_queue_tail = elem;
|
220 |
|
|
}
|
221 |
|
|
}
|
222 |
|
|
|
223 |
|
|
/* Try to remove the first element from update_cost_queue. Return false
|
224 |
|
|
if the queue was empty, otherwise make (*ALLOCNO, *DIVISOR) describe
|
225 |
|
|
the removed element. */
|
226 |
|
|
static inline bool
|
227 |
|
|
get_next_update_cost (ira_allocno_t *allocno, int *divisor)
|
228 |
|
|
{
|
229 |
|
|
struct update_cost_queue_elem *elem;
|
230 |
|
|
|
231 |
|
|
if (update_cost_queue == NULL)
|
232 |
|
|
return false;
|
233 |
|
|
|
234 |
|
|
*allocno = update_cost_queue;
|
235 |
|
|
elem = &update_cost_queue_elems[ALLOCNO_NUM (*allocno)];
|
236 |
|
|
*divisor = elem->divisor;
|
237 |
|
|
update_cost_queue = elem->next;
|
238 |
|
|
return true;
|
239 |
|
|
}
|
240 |
|
|
|
241 |
|
|
/* Update the cost of allocnos to increase chances to remove some
|
242 |
|
|
copies as the result of subsequent assignment. */
|
243 |
|
|
static void
|
244 |
|
|
update_copy_costs (ira_allocno_t allocno, bool decr_p)
|
245 |
|
|
{
|
246 |
|
|
int i, cost, update_cost, hard_regno, divisor;
|
247 |
|
|
enum machine_mode mode;
|
248 |
|
|
enum reg_class rclass, cover_class;
|
249 |
|
|
ira_allocno_t another_allocno;
|
250 |
|
|
ira_copy_t cp, next_cp;
|
251 |
|
|
|
252 |
|
|
hard_regno = ALLOCNO_HARD_REGNO (allocno);
|
253 |
|
|
ira_assert (hard_regno >= 0);
|
254 |
|
|
|
255 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
256 |
|
|
if (cover_class == NO_REGS)
|
257 |
|
|
return;
|
258 |
|
|
i = ira_class_hard_reg_index[cover_class][hard_regno];
|
259 |
|
|
ira_assert (i >= 0);
|
260 |
|
|
rclass = REGNO_REG_CLASS (hard_regno);
|
261 |
|
|
|
262 |
|
|
start_update_cost ();
|
263 |
|
|
divisor = 1;
|
264 |
|
|
do
|
265 |
|
|
{
|
266 |
|
|
mode = ALLOCNO_MODE (allocno);
|
267 |
|
|
for (cp = ALLOCNO_COPIES (allocno); cp != NULL; cp = next_cp)
|
268 |
|
|
{
|
269 |
|
|
if (cp->first == allocno)
|
270 |
|
|
{
|
271 |
|
|
next_cp = cp->next_first_allocno_copy;
|
272 |
|
|
another_allocno = cp->second;
|
273 |
|
|
}
|
274 |
|
|
else if (cp->second == allocno)
|
275 |
|
|
{
|
276 |
|
|
next_cp = cp->next_second_allocno_copy;
|
277 |
|
|
another_allocno = cp->first;
|
278 |
|
|
}
|
279 |
|
|
else
|
280 |
|
|
gcc_unreachable ();
|
281 |
|
|
|
282 |
|
|
cover_class = ALLOCNO_COVER_CLASS (another_allocno);
|
283 |
|
|
if (! ira_reg_classes_intersect_p[rclass][cover_class]
|
284 |
|
|
|| ALLOCNO_ASSIGNED_P (another_allocno))
|
285 |
|
|
continue;
|
286 |
|
|
|
287 |
|
|
cost = (cp->second == allocno
|
288 |
|
|
? ira_get_register_move_cost (mode, rclass, cover_class)
|
289 |
|
|
: ira_get_register_move_cost (mode, cover_class, rclass));
|
290 |
|
|
if (decr_p)
|
291 |
|
|
cost = -cost;
|
292 |
|
|
|
293 |
|
|
update_cost = cp->freq * cost / divisor;
|
294 |
|
|
if (update_cost == 0)
|
295 |
|
|
continue;
|
296 |
|
|
|
297 |
|
|
ira_allocate_and_set_or_copy_costs
|
298 |
|
|
(&ALLOCNO_UPDATED_HARD_REG_COSTS (another_allocno), cover_class,
|
299 |
|
|
ALLOCNO_UPDATED_COVER_CLASS_COST (another_allocno),
|
300 |
|
|
ALLOCNO_HARD_REG_COSTS (another_allocno));
|
301 |
|
|
ira_allocate_and_set_or_copy_costs
|
302 |
|
|
(&ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (another_allocno),
|
303 |
|
|
cover_class, 0,
|
304 |
|
|
ALLOCNO_CONFLICT_HARD_REG_COSTS (another_allocno));
|
305 |
|
|
i = ira_class_hard_reg_index[cover_class][hard_regno];
|
306 |
|
|
ira_assert (i >= 0);
|
307 |
|
|
ALLOCNO_UPDATED_HARD_REG_COSTS (another_allocno)[i] += update_cost;
|
308 |
|
|
ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (another_allocno)[i]
|
309 |
|
|
+= update_cost;
|
310 |
|
|
|
311 |
|
|
queue_update_cost (another_allocno, divisor * COST_HOP_DIVISOR);
|
312 |
|
|
}
|
313 |
|
|
}
|
314 |
|
|
while (get_next_update_cost (&allocno, &divisor));
|
315 |
|
|
}
|
316 |
|
|
|
317 |
|
|
/* This function updates COSTS (decrease if DECR_P) for hard_registers
|
318 |
|
|
of COVER_CLASS by conflict costs of the unassigned allocnos
|
319 |
|
|
connected by copies with allocnos in update_cost_queue. This
|
320 |
|
|
update increases chances to remove some copies. */
|
321 |
|
|
static void
|
322 |
|
|
update_conflict_hard_regno_costs (int *costs, enum reg_class cover_class,
|
323 |
|
|
bool decr_p)
|
324 |
|
|
{
|
325 |
|
|
int i, cost, class_size, freq, mult, div, divisor;
|
326 |
|
|
int index, hard_regno;
|
327 |
|
|
int *conflict_costs;
|
328 |
|
|
bool cont_p;
|
329 |
|
|
enum reg_class another_cover_class;
|
330 |
|
|
ira_allocno_t allocno, another_allocno;
|
331 |
|
|
ira_copy_t cp, next_cp;
|
332 |
|
|
|
333 |
|
|
while (get_next_update_cost (&allocno, &divisor))
|
334 |
|
|
for (cp = ALLOCNO_COPIES (allocno); cp != NULL; cp = next_cp)
|
335 |
|
|
{
|
336 |
|
|
if (cp->first == allocno)
|
337 |
|
|
{
|
338 |
|
|
next_cp = cp->next_first_allocno_copy;
|
339 |
|
|
another_allocno = cp->second;
|
340 |
|
|
}
|
341 |
|
|
else if (cp->second == allocno)
|
342 |
|
|
{
|
343 |
|
|
next_cp = cp->next_second_allocno_copy;
|
344 |
|
|
another_allocno = cp->first;
|
345 |
|
|
}
|
346 |
|
|
else
|
347 |
|
|
gcc_unreachable ();
|
348 |
|
|
another_cover_class = ALLOCNO_COVER_CLASS (another_allocno);
|
349 |
|
|
if (! ira_reg_classes_intersect_p[cover_class][another_cover_class]
|
350 |
|
|
|| ALLOCNO_ASSIGNED_P (another_allocno)
|
351 |
|
|
|| ALLOCNO_MAY_BE_SPILLED_P (ALLOCNO_FIRST_COALESCED_ALLOCNO
|
352 |
|
|
(another_allocno)))
|
353 |
|
|
continue;
|
354 |
|
|
class_size = ira_class_hard_regs_num[another_cover_class];
|
355 |
|
|
ira_allocate_and_copy_costs
|
356 |
|
|
(&ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (another_allocno),
|
357 |
|
|
another_cover_class,
|
358 |
|
|
ALLOCNO_CONFLICT_HARD_REG_COSTS (another_allocno));
|
359 |
|
|
conflict_costs
|
360 |
|
|
= ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (another_allocno);
|
361 |
|
|
if (conflict_costs == NULL)
|
362 |
|
|
cont_p = true;
|
363 |
|
|
else
|
364 |
|
|
{
|
365 |
|
|
mult = cp->freq;
|
366 |
|
|
freq = ALLOCNO_FREQ (another_allocno);
|
367 |
|
|
if (freq == 0)
|
368 |
|
|
freq = 1;
|
369 |
|
|
div = freq * divisor;
|
370 |
|
|
cont_p = false;
|
371 |
|
|
for (i = class_size - 1; i >= 0; i--)
|
372 |
|
|
{
|
373 |
|
|
hard_regno = ira_class_hard_regs[another_cover_class][i];
|
374 |
|
|
ira_assert (hard_regno >= 0);
|
375 |
|
|
index = ira_class_hard_reg_index[cover_class][hard_regno];
|
376 |
|
|
if (index < 0)
|
377 |
|
|
continue;
|
378 |
|
|
cost = conflict_costs [i] * mult / div;
|
379 |
|
|
if (cost == 0)
|
380 |
|
|
continue;
|
381 |
|
|
cont_p = true;
|
382 |
|
|
if (decr_p)
|
383 |
|
|
cost = -cost;
|
384 |
|
|
costs[index] += cost;
|
385 |
|
|
}
|
386 |
|
|
}
|
387 |
|
|
/* Probably 5 hops will be enough. */
|
388 |
|
|
if (cont_p
|
389 |
|
|
&& divisor <= (COST_HOP_DIVISOR
|
390 |
|
|
* COST_HOP_DIVISOR
|
391 |
|
|
* COST_HOP_DIVISOR
|
392 |
|
|
* COST_HOP_DIVISOR))
|
393 |
|
|
queue_update_cost (another_allocno, divisor * COST_HOP_DIVISOR);
|
394 |
|
|
}
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
/* Sort allocnos according to the profit of usage of a hard register
|
398 |
|
|
instead of memory for them. */
|
399 |
|
|
static int
|
400 |
|
|
allocno_cost_compare_func (const void *v1p, const void *v2p)
|
401 |
|
|
{
|
402 |
|
|
ira_allocno_t p1 = *(const ira_allocno_t *) v1p;
|
403 |
|
|
ira_allocno_t p2 = *(const ira_allocno_t *) v2p;
|
404 |
|
|
int c1, c2;
|
405 |
|
|
|
406 |
|
|
c1 = ALLOCNO_UPDATED_MEMORY_COST (p1) - ALLOCNO_UPDATED_COVER_CLASS_COST (p1);
|
407 |
|
|
c2 = ALLOCNO_UPDATED_MEMORY_COST (p2) - ALLOCNO_UPDATED_COVER_CLASS_COST (p2);
|
408 |
|
|
if (c1 - c2)
|
409 |
|
|
return c1 - c2;
|
410 |
|
|
|
411 |
|
|
/* If regs are equally good, sort by allocno numbers, so that the
|
412 |
|
|
results of qsort leave nothing to chance. */
|
413 |
|
|
return ALLOCNO_NUM (p1) - ALLOCNO_NUM (p2);
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
/* Print all allocnos coalesced with ALLOCNO. */
|
417 |
|
|
static void
|
418 |
|
|
print_coalesced_allocno (ira_allocno_t allocno)
|
419 |
|
|
{
|
420 |
|
|
ira_allocno_t a;
|
421 |
|
|
|
422 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
423 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
424 |
|
|
{
|
425 |
|
|
ira_print_expanded_allocno (a);
|
426 |
|
|
if (a == allocno)
|
427 |
|
|
break;
|
428 |
|
|
fprintf (ira_dump_file, "+");
|
429 |
|
|
}
|
430 |
|
|
}
|
431 |
|
|
|
432 |
|
|
/* Choose a hard register for ALLOCNO (or for all coalesced allocnos
|
433 |
|
|
represented by ALLOCNO). If RETRY_P is TRUE, it means that the
|
434 |
|
|
function called from function `ira_reassign_conflict_allocnos' and
|
435 |
|
|
`allocno_reload_assign'. This function implements the optimistic
|
436 |
|
|
coalescing too: if we failed to assign a hard register to set of
|
437 |
|
|
the coalesced allocnos, we put them onto the coloring stack for
|
438 |
|
|
subsequent separate assigning. */
|
439 |
|
|
static bool
|
440 |
|
|
assign_hard_reg (ira_allocno_t allocno, bool retry_p)
|
441 |
|
|
{
|
442 |
|
|
HARD_REG_SET conflicting_regs;
|
443 |
|
|
int i, j, k, hard_regno, best_hard_regno, class_size;
|
444 |
|
|
int cost, mem_cost, min_cost, full_cost, min_full_cost, add_cost;
|
445 |
|
|
int *a_costs;
|
446 |
|
|
int *conflict_costs;
|
447 |
|
|
enum reg_class cover_class, rclass, conflict_cover_class;
|
448 |
|
|
enum machine_mode mode;
|
449 |
|
|
ira_allocno_t a, conflict_allocno;
|
450 |
|
|
ira_allocno_conflict_iterator aci;
|
451 |
|
|
static int costs[FIRST_PSEUDO_REGISTER], full_costs[FIRST_PSEUDO_REGISTER];
|
452 |
|
|
#ifdef STACK_REGS
|
453 |
|
|
bool no_stack_reg_p;
|
454 |
|
|
#endif
|
455 |
|
|
|
456 |
|
|
ira_assert (! ALLOCNO_ASSIGNED_P (allocno));
|
457 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
458 |
|
|
class_size = ira_class_hard_regs_num[cover_class];
|
459 |
|
|
mode = ALLOCNO_MODE (allocno);
|
460 |
|
|
CLEAR_HARD_REG_SET (conflicting_regs);
|
461 |
|
|
best_hard_regno = -1;
|
462 |
|
|
memset (full_costs, 0, sizeof (int) * class_size);
|
463 |
|
|
mem_cost = 0;
|
464 |
|
|
if (allocno_coalesced_p)
|
465 |
|
|
bitmap_clear (processed_coalesced_allocno_bitmap);
|
466 |
|
|
memset (costs, 0, sizeof (int) * class_size);
|
467 |
|
|
memset (full_costs, 0, sizeof (int) * class_size);
|
468 |
|
|
#ifdef STACK_REGS
|
469 |
|
|
no_stack_reg_p = false;
|
470 |
|
|
#endif
|
471 |
|
|
start_update_cost ();
|
472 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
473 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
474 |
|
|
{
|
475 |
|
|
mem_cost += ALLOCNO_UPDATED_MEMORY_COST (a);
|
476 |
|
|
IOR_HARD_REG_SET (conflicting_regs,
|
477 |
|
|
ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a));
|
478 |
|
|
ira_allocate_and_copy_costs (&ALLOCNO_UPDATED_HARD_REG_COSTS (a),
|
479 |
|
|
cover_class, ALLOCNO_HARD_REG_COSTS (a));
|
480 |
|
|
a_costs = ALLOCNO_UPDATED_HARD_REG_COSTS (a);
|
481 |
|
|
#ifdef STACK_REGS
|
482 |
|
|
no_stack_reg_p = no_stack_reg_p || ALLOCNO_TOTAL_NO_STACK_REG_P (a);
|
483 |
|
|
#endif
|
484 |
|
|
for (cost = ALLOCNO_UPDATED_COVER_CLASS_COST (a), i = 0;
|
485 |
|
|
i < class_size;
|
486 |
|
|
i++)
|
487 |
|
|
if (a_costs != NULL)
|
488 |
|
|
{
|
489 |
|
|
costs[i] += a_costs[i];
|
490 |
|
|
full_costs[i] += a_costs[i];
|
491 |
|
|
}
|
492 |
|
|
else
|
493 |
|
|
{
|
494 |
|
|
costs[i] += cost;
|
495 |
|
|
full_costs[i] += cost;
|
496 |
|
|
}
|
497 |
|
|
/* Take preferences of conflicting allocnos into account. */
|
498 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_allocno, aci)
|
499 |
|
|
/* Reload can give another class so we need to check all
|
500 |
|
|
allocnos. */
|
501 |
|
|
if (retry_p || bitmap_bit_p (consideration_allocno_bitmap,
|
502 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
503 |
|
|
{
|
504 |
|
|
conflict_cover_class = ALLOCNO_COVER_CLASS (conflict_allocno);
|
505 |
|
|
ira_assert (ira_reg_classes_intersect_p
|
506 |
|
|
[cover_class][conflict_cover_class]);
|
507 |
|
|
if (allocno_coalesced_p)
|
508 |
|
|
{
|
509 |
|
|
if (bitmap_bit_p (processed_coalesced_allocno_bitmap,
|
510 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
511 |
|
|
continue;
|
512 |
|
|
bitmap_set_bit (processed_coalesced_allocno_bitmap,
|
513 |
|
|
ALLOCNO_NUM (conflict_allocno));
|
514 |
|
|
}
|
515 |
|
|
if (ALLOCNO_ASSIGNED_P (conflict_allocno))
|
516 |
|
|
{
|
517 |
|
|
if ((hard_regno = ALLOCNO_HARD_REGNO (conflict_allocno)) >= 0
|
518 |
|
|
&& ira_class_hard_reg_index[cover_class][hard_regno] >= 0)
|
519 |
|
|
{
|
520 |
|
|
IOR_HARD_REG_SET
|
521 |
|
|
(conflicting_regs,
|
522 |
|
|
ira_reg_mode_hard_regset
|
523 |
|
|
[hard_regno][ALLOCNO_MODE (conflict_allocno)]);
|
524 |
|
|
if (hard_reg_set_subset_p (reg_class_contents[cover_class],
|
525 |
|
|
conflicting_regs))
|
526 |
|
|
goto fail;
|
527 |
|
|
}
|
528 |
|
|
}
|
529 |
|
|
else if (! ALLOCNO_MAY_BE_SPILLED_P (ALLOCNO_FIRST_COALESCED_ALLOCNO
|
530 |
|
|
(conflict_allocno)))
|
531 |
|
|
{
|
532 |
|
|
ira_allocate_and_copy_costs
|
533 |
|
|
(&ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (conflict_allocno),
|
534 |
|
|
conflict_cover_class,
|
535 |
|
|
ALLOCNO_CONFLICT_HARD_REG_COSTS (conflict_allocno));
|
536 |
|
|
conflict_costs
|
537 |
|
|
= ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (conflict_allocno);
|
538 |
|
|
if (conflict_costs != NULL)
|
539 |
|
|
for (j = class_size - 1; j >= 0; j--)
|
540 |
|
|
{
|
541 |
|
|
hard_regno = ira_class_hard_regs[cover_class][j];
|
542 |
|
|
ira_assert (hard_regno >= 0);
|
543 |
|
|
k = (ira_class_hard_reg_index
|
544 |
|
|
[conflict_cover_class][hard_regno]);
|
545 |
|
|
if (k < 0)
|
546 |
|
|
continue;
|
547 |
|
|
full_costs[j] -= conflict_costs[k];
|
548 |
|
|
}
|
549 |
|
|
queue_update_cost (conflict_allocno, COST_HOP_DIVISOR);
|
550 |
|
|
}
|
551 |
|
|
}
|
552 |
|
|
if (a == allocno)
|
553 |
|
|
break;
|
554 |
|
|
}
|
555 |
|
|
/* Take into account preferences of allocnos connected by copies to
|
556 |
|
|
the conflict allocnos. */
|
557 |
|
|
update_conflict_hard_regno_costs (full_costs, cover_class, true);
|
558 |
|
|
|
559 |
|
|
/* Take preferences of allocnos connected by copies into
|
560 |
|
|
account. */
|
561 |
|
|
start_update_cost ();
|
562 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
563 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
564 |
|
|
{
|
565 |
|
|
queue_update_cost (a, COST_HOP_DIVISOR);
|
566 |
|
|
if (a == allocno)
|
567 |
|
|
break;
|
568 |
|
|
}
|
569 |
|
|
update_conflict_hard_regno_costs (full_costs, cover_class, false);
|
570 |
|
|
min_cost = min_full_cost = INT_MAX;
|
571 |
|
|
/* We don't care about giving callee saved registers to allocnos no
|
572 |
|
|
living through calls because call clobbered registers are
|
573 |
|
|
allocated first (it is usual practice to put them first in
|
574 |
|
|
REG_ALLOC_ORDER). */
|
575 |
|
|
for (i = 0; i < class_size; i++)
|
576 |
|
|
{
|
577 |
|
|
hard_regno = ira_class_hard_regs[cover_class][i];
|
578 |
|
|
#ifdef STACK_REGS
|
579 |
|
|
if (no_stack_reg_p
|
580 |
|
|
&& FIRST_STACK_REG <= hard_regno && hard_regno <= LAST_STACK_REG)
|
581 |
|
|
continue;
|
582 |
|
|
#endif
|
583 |
|
|
if (! ira_hard_reg_not_in_set_p (hard_regno, mode, conflicting_regs)
|
584 |
|
|
|| TEST_HARD_REG_BIT (prohibited_class_mode_regs[cover_class][mode],
|
585 |
|
|
hard_regno))
|
586 |
|
|
continue;
|
587 |
|
|
cost = costs[i];
|
588 |
|
|
full_cost = full_costs[i];
|
589 |
|
|
if (! allocated_hardreg_p[hard_regno]
|
590 |
|
|
&& ira_hard_reg_not_in_set_p (hard_regno, mode, call_used_reg_set))
|
591 |
|
|
/* We need to save/restore the hard register in
|
592 |
|
|
epilogue/prologue. Therefore we increase the cost. */
|
593 |
|
|
{
|
594 |
|
|
/* ??? If only part is call clobbered. */
|
595 |
|
|
rclass = REGNO_REG_CLASS (hard_regno);
|
596 |
|
|
add_cost = (ira_memory_move_cost[mode][rclass][0]
|
597 |
|
|
+ ira_memory_move_cost[mode][rclass][1] - 1);
|
598 |
|
|
cost += add_cost;
|
599 |
|
|
full_cost += add_cost;
|
600 |
|
|
}
|
601 |
|
|
if (min_cost > cost)
|
602 |
|
|
min_cost = cost;
|
603 |
|
|
if (min_full_cost > full_cost)
|
604 |
|
|
{
|
605 |
|
|
min_full_cost = full_cost;
|
606 |
|
|
best_hard_regno = hard_regno;
|
607 |
|
|
ira_assert (hard_regno >= 0);
|
608 |
|
|
}
|
609 |
|
|
}
|
610 |
|
|
if (min_full_cost > mem_cost)
|
611 |
|
|
{
|
612 |
|
|
if (! retry_p && internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
613 |
|
|
fprintf (ira_dump_file, "(memory is more profitable %d vs %d) ",
|
614 |
|
|
mem_cost, min_full_cost);
|
615 |
|
|
best_hard_regno = -1;
|
616 |
|
|
}
|
617 |
|
|
fail:
|
618 |
|
|
if (flag_ira_algorithm != IRA_ALGORITHM_PRIORITY
|
619 |
|
|
&& best_hard_regno < 0
|
620 |
|
|
&& ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno) != allocno)
|
621 |
|
|
{
|
622 |
|
|
for (j = 0, a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
623 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
624 |
|
|
{
|
625 |
|
|
ira_assert (! ALLOCNO_IN_GRAPH_P (a));
|
626 |
|
|
sorted_allocnos[j++] = a;
|
627 |
|
|
if (a == allocno)
|
628 |
|
|
break;
|
629 |
|
|
}
|
630 |
|
|
qsort (sorted_allocnos, j, sizeof (ira_allocno_t),
|
631 |
|
|
allocno_cost_compare_func);
|
632 |
|
|
for (i = 0; i < j; i++)
|
633 |
|
|
{
|
634 |
|
|
a = sorted_allocnos[i];
|
635 |
|
|
ALLOCNO_FIRST_COALESCED_ALLOCNO (a) = a;
|
636 |
|
|
ALLOCNO_NEXT_COALESCED_ALLOCNO (a) = a;
|
637 |
|
|
VEC_safe_push (ira_allocno_t, heap, allocno_stack_vec, a);
|
638 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
639 |
|
|
{
|
640 |
|
|
fprintf (ira_dump_file, " Pushing");
|
641 |
|
|
print_coalesced_allocno (a);
|
642 |
|
|
fprintf (ira_dump_file, "\n");
|
643 |
|
|
}
|
644 |
|
|
}
|
645 |
|
|
return false;
|
646 |
|
|
}
|
647 |
|
|
if (best_hard_regno >= 0)
|
648 |
|
|
allocated_hardreg_p[best_hard_regno] = true;
|
649 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
650 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
651 |
|
|
{
|
652 |
|
|
ALLOCNO_HARD_REGNO (a) = best_hard_regno;
|
653 |
|
|
ALLOCNO_ASSIGNED_P (a) = true;
|
654 |
|
|
if (best_hard_regno >= 0)
|
655 |
|
|
update_copy_costs (a, true);
|
656 |
|
|
ira_assert (ALLOCNO_COVER_CLASS (a) == cover_class);
|
657 |
|
|
/* We don't need updated costs anymore: */
|
658 |
|
|
ira_free_allocno_updated_costs (a);
|
659 |
|
|
if (a == allocno)
|
660 |
|
|
break;
|
661 |
|
|
}
|
662 |
|
|
return best_hard_regno >= 0;
|
663 |
|
|
}
|
664 |
|
|
|
665 |
|
|
|
666 |
|
|
|
667 |
|
|
/* This page contains the allocator based on the Chaitin-Briggs algorithm. */
|
668 |
|
|
|
669 |
|
|
/* Bucket of allocnos that can colored currently without spilling. */
|
670 |
|
|
static ira_allocno_t colorable_allocno_bucket;
|
671 |
|
|
|
672 |
|
|
/* Bucket of allocnos that might be not colored currently without
|
673 |
|
|
spilling. */
|
674 |
|
|
static ira_allocno_t uncolorable_allocno_bucket;
|
675 |
|
|
|
676 |
|
|
/* Each element of the array contains the current number of allocnos
|
677 |
|
|
of given *cover* class in the uncolorable_bucket. */
|
678 |
|
|
static int uncolorable_allocnos_num[N_REG_CLASSES];
|
679 |
|
|
|
680 |
|
|
/* Return the current spill priority of allocno A. The less the
|
681 |
|
|
number, the more preferable the allocno for spilling. */
|
682 |
|
|
static int
|
683 |
|
|
allocno_spill_priority (ira_allocno_t a)
|
684 |
|
|
{
|
685 |
|
|
return (ALLOCNO_TEMP (a)
|
686 |
|
|
/ (ALLOCNO_LEFT_CONFLICTS_SIZE (a)
|
687 |
|
|
* ira_reg_class_nregs[ALLOCNO_COVER_CLASS (a)][ALLOCNO_MODE (a)]
|
688 |
|
|
+ 1));
|
689 |
|
|
}
|
690 |
|
|
|
691 |
|
|
/* Add ALLOCNO to bucket *BUCKET_PTR. ALLOCNO should be not in a bucket
|
692 |
|
|
before the call. */
|
693 |
|
|
static void
|
694 |
|
|
add_allocno_to_bucket (ira_allocno_t allocno, ira_allocno_t *bucket_ptr)
|
695 |
|
|
{
|
696 |
|
|
ira_allocno_t first_allocno;
|
697 |
|
|
enum reg_class cover_class;
|
698 |
|
|
|
699 |
|
|
if (bucket_ptr == &uncolorable_allocno_bucket
|
700 |
|
|
&& (cover_class = ALLOCNO_COVER_CLASS (allocno)) != NO_REGS)
|
701 |
|
|
{
|
702 |
|
|
uncolorable_allocnos_num[cover_class]++;
|
703 |
|
|
ira_assert (uncolorable_allocnos_num[cover_class] > 0);
|
704 |
|
|
}
|
705 |
|
|
first_allocno = *bucket_ptr;
|
706 |
|
|
ALLOCNO_NEXT_BUCKET_ALLOCNO (allocno) = first_allocno;
|
707 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (allocno) = NULL;
|
708 |
|
|
if (first_allocno != NULL)
|
709 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (first_allocno) = allocno;
|
710 |
|
|
*bucket_ptr = allocno;
|
711 |
|
|
}
|
712 |
|
|
|
713 |
|
|
/* The function returns frequency and number of available hard
|
714 |
|
|
registers for allocnos coalesced with ALLOCNO. */
|
715 |
|
|
static void
|
716 |
|
|
get_coalesced_allocnos_attributes (ira_allocno_t allocno, int *freq, int *num)
|
717 |
|
|
{
|
718 |
|
|
ira_allocno_t a;
|
719 |
|
|
|
720 |
|
|
*freq = 0;
|
721 |
|
|
*num = 0;
|
722 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
723 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
724 |
|
|
{
|
725 |
|
|
*freq += ALLOCNO_FREQ (a);
|
726 |
|
|
*num += ALLOCNO_AVAILABLE_REGS_NUM (a);
|
727 |
|
|
if (a == allocno)
|
728 |
|
|
break;
|
729 |
|
|
}
|
730 |
|
|
}
|
731 |
|
|
|
732 |
|
|
/* Compare two allocnos to define which allocno should be pushed first
|
733 |
|
|
into the coloring stack. If the return is a negative number, the
|
734 |
|
|
allocno given by the first parameter will be pushed first. In this
|
735 |
|
|
case such allocno has less priority than the second one and the
|
736 |
|
|
hard register will be assigned to it after assignment to the second
|
737 |
|
|
one. As the result of such assignment order, the second allocno
|
738 |
|
|
has a better chance to get the best hard register. */
|
739 |
|
|
static int
|
740 |
|
|
bucket_allocno_compare_func (const void *v1p, const void *v2p)
|
741 |
|
|
{
|
742 |
|
|
ira_allocno_t a1 = *(const ira_allocno_t *) v1p;
|
743 |
|
|
ira_allocno_t a2 = *(const ira_allocno_t *) v2p;
|
744 |
|
|
int diff, a1_freq, a2_freq, a1_num, a2_num;
|
745 |
|
|
|
746 |
|
|
if ((diff = (int) ALLOCNO_COVER_CLASS (a2) - ALLOCNO_COVER_CLASS (a1)) != 0)
|
747 |
|
|
return diff;
|
748 |
|
|
get_coalesced_allocnos_attributes (a1, &a1_freq, &a1_num);
|
749 |
|
|
get_coalesced_allocnos_attributes (a2, &a2_freq, &a2_num);
|
750 |
|
|
if ((diff = a2_num - a1_num) != 0)
|
751 |
|
|
return diff;
|
752 |
|
|
else if ((diff = a1_freq - a2_freq) != 0)
|
753 |
|
|
return diff;
|
754 |
|
|
return ALLOCNO_NUM (a2) - ALLOCNO_NUM (a1);
|
755 |
|
|
}
|
756 |
|
|
|
757 |
|
|
/* Sort bucket *BUCKET_PTR and return the result through
|
758 |
|
|
BUCKET_PTR. */
|
759 |
|
|
static void
|
760 |
|
|
sort_bucket (ira_allocno_t *bucket_ptr)
|
761 |
|
|
{
|
762 |
|
|
ira_allocno_t a, head;
|
763 |
|
|
int n;
|
764 |
|
|
|
765 |
|
|
for (n = 0, a = *bucket_ptr; a != NULL; a = ALLOCNO_NEXT_BUCKET_ALLOCNO (a))
|
766 |
|
|
sorted_allocnos[n++] = a;
|
767 |
|
|
if (n <= 1)
|
768 |
|
|
return;
|
769 |
|
|
qsort (sorted_allocnos, n, sizeof (ira_allocno_t),
|
770 |
|
|
bucket_allocno_compare_func);
|
771 |
|
|
head = NULL;
|
772 |
|
|
for (n--; n >= 0; n--)
|
773 |
|
|
{
|
774 |
|
|
a = sorted_allocnos[n];
|
775 |
|
|
ALLOCNO_NEXT_BUCKET_ALLOCNO (a) = head;
|
776 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (a) = NULL;
|
777 |
|
|
if (head != NULL)
|
778 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (head) = a;
|
779 |
|
|
head = a;
|
780 |
|
|
}
|
781 |
|
|
*bucket_ptr = head;
|
782 |
|
|
}
|
783 |
|
|
|
784 |
|
|
/* Add ALLOCNO to bucket *BUCKET_PTR maintaining the order according
|
785 |
|
|
their priority. ALLOCNO should be not in a bucket before the
|
786 |
|
|
call. */
|
787 |
|
|
static void
|
788 |
|
|
add_allocno_to_ordered_bucket (ira_allocno_t allocno,
|
789 |
|
|
ira_allocno_t *bucket_ptr)
|
790 |
|
|
{
|
791 |
|
|
ira_allocno_t before, after;
|
792 |
|
|
enum reg_class cover_class;
|
793 |
|
|
|
794 |
|
|
if (bucket_ptr == &uncolorable_allocno_bucket
|
795 |
|
|
&& (cover_class = ALLOCNO_COVER_CLASS (allocno)) != NO_REGS)
|
796 |
|
|
{
|
797 |
|
|
uncolorable_allocnos_num[cover_class]++;
|
798 |
|
|
ira_assert (uncolorable_allocnos_num[cover_class] > 0);
|
799 |
|
|
}
|
800 |
|
|
for (before = *bucket_ptr, after = NULL;
|
801 |
|
|
before != NULL;
|
802 |
|
|
after = before, before = ALLOCNO_NEXT_BUCKET_ALLOCNO (before))
|
803 |
|
|
if (bucket_allocno_compare_func (&allocno, &before) < 0)
|
804 |
|
|
break;
|
805 |
|
|
ALLOCNO_NEXT_BUCKET_ALLOCNO (allocno) = before;
|
806 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (allocno) = after;
|
807 |
|
|
if (after == NULL)
|
808 |
|
|
*bucket_ptr = allocno;
|
809 |
|
|
else
|
810 |
|
|
ALLOCNO_NEXT_BUCKET_ALLOCNO (after) = allocno;
|
811 |
|
|
if (before != NULL)
|
812 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (before) = allocno;
|
813 |
|
|
}
|
814 |
|
|
|
815 |
|
|
/* Delete ALLOCNO from bucket *BUCKET_PTR. It should be there before
|
816 |
|
|
the call. */
|
817 |
|
|
static void
|
818 |
|
|
delete_allocno_from_bucket (ira_allocno_t allocno, ira_allocno_t *bucket_ptr)
|
819 |
|
|
{
|
820 |
|
|
ira_allocno_t prev_allocno, next_allocno;
|
821 |
|
|
enum reg_class cover_class;
|
822 |
|
|
|
823 |
|
|
if (bucket_ptr == &uncolorable_allocno_bucket
|
824 |
|
|
&& (cover_class = ALLOCNO_COVER_CLASS (allocno)) != NO_REGS)
|
825 |
|
|
{
|
826 |
|
|
uncolorable_allocnos_num[cover_class]--;
|
827 |
|
|
ira_assert (uncolorable_allocnos_num[cover_class] >= 0);
|
828 |
|
|
}
|
829 |
|
|
prev_allocno = ALLOCNO_PREV_BUCKET_ALLOCNO (allocno);
|
830 |
|
|
next_allocno = ALLOCNO_NEXT_BUCKET_ALLOCNO (allocno);
|
831 |
|
|
if (prev_allocno != NULL)
|
832 |
|
|
ALLOCNO_NEXT_BUCKET_ALLOCNO (prev_allocno) = next_allocno;
|
833 |
|
|
else
|
834 |
|
|
{
|
835 |
|
|
ira_assert (*bucket_ptr == allocno);
|
836 |
|
|
*bucket_ptr = next_allocno;
|
837 |
|
|
}
|
838 |
|
|
if (next_allocno != NULL)
|
839 |
|
|
ALLOCNO_PREV_BUCKET_ALLOCNO (next_allocno) = prev_allocno;
|
840 |
|
|
}
|
841 |
|
|
|
842 |
|
|
/* Splay tree for each cover class. The trees are indexed by the
|
843 |
|
|
corresponding cover classes. Splay trees contain uncolorable
|
844 |
|
|
allocnos. */
|
845 |
|
|
static splay_tree uncolorable_allocnos_splay_tree[N_REG_CLASSES];
|
846 |
|
|
|
847 |
|
|
/* If the following macro is TRUE, splay tree is used to choose an
|
848 |
|
|
allocno of the corresponding cover class for spilling. When the
|
849 |
|
|
number uncolorable allocnos of given cover class decreases to some
|
850 |
|
|
threshold, linear array search is used to find the best allocno for
|
851 |
|
|
spilling. This threshold is actually pretty big because, although
|
852 |
|
|
splay trees asymptotically is much faster, each splay tree
|
853 |
|
|
operation is sufficiently costly especially taking cache locality
|
854 |
|
|
into account. */
|
855 |
|
|
#define USE_SPLAY_P(CLASS) (uncolorable_allocnos_num[CLASS] > 4000)
|
856 |
|
|
|
857 |
|
|
/* Put ALLOCNO onto the coloring stack without removing it from its
|
858 |
|
|
bucket. Pushing allocno to the coloring stack can result in moving
|
859 |
|
|
conflicting allocnos from the uncolorable bucket to the colorable
|
860 |
|
|
one. */
|
861 |
|
|
static void
|
862 |
|
|
push_allocno_to_stack (ira_allocno_t allocno)
|
863 |
|
|
{
|
864 |
|
|
int left_conflicts_size, conflict_size, size;
|
865 |
|
|
ira_allocno_t a, conflict_allocno;
|
866 |
|
|
enum reg_class cover_class;
|
867 |
|
|
ira_allocno_conflict_iterator aci;
|
868 |
|
|
|
869 |
|
|
ALLOCNO_IN_GRAPH_P (allocno) = false;
|
870 |
|
|
VEC_safe_push (ira_allocno_t, heap, allocno_stack_vec, allocno);
|
871 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
872 |
|
|
if (cover_class == NO_REGS)
|
873 |
|
|
return;
|
874 |
|
|
size = ira_reg_class_nregs[cover_class][ALLOCNO_MODE (allocno)];
|
875 |
|
|
if (allocno_coalesced_p)
|
876 |
|
|
bitmap_clear (processed_coalesced_allocno_bitmap);
|
877 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
878 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
879 |
|
|
{
|
880 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_allocno, aci)
|
881 |
|
|
{
|
882 |
|
|
conflict_allocno = ALLOCNO_FIRST_COALESCED_ALLOCNO (conflict_allocno);
|
883 |
|
|
if (bitmap_bit_p (coloring_allocno_bitmap,
|
884 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
885 |
|
|
{
|
886 |
|
|
ira_assert (cover_class
|
887 |
|
|
== ALLOCNO_COVER_CLASS (conflict_allocno));
|
888 |
|
|
if (allocno_coalesced_p)
|
889 |
|
|
{
|
890 |
|
|
if (bitmap_bit_p (processed_coalesced_allocno_bitmap,
|
891 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
892 |
|
|
continue;
|
893 |
|
|
bitmap_set_bit (processed_coalesced_allocno_bitmap,
|
894 |
|
|
ALLOCNO_NUM (conflict_allocno));
|
895 |
|
|
}
|
896 |
|
|
if (ALLOCNO_IN_GRAPH_P (conflict_allocno)
|
897 |
|
|
&& ! ALLOCNO_ASSIGNED_P (conflict_allocno))
|
898 |
|
|
{
|
899 |
|
|
left_conflicts_size
|
900 |
|
|
= ALLOCNO_LEFT_CONFLICTS_SIZE (conflict_allocno);
|
901 |
|
|
conflict_size
|
902 |
|
|
= (ira_reg_class_nregs
|
903 |
|
|
[cover_class][ALLOCNO_MODE (conflict_allocno)]);
|
904 |
|
|
ira_assert
|
905 |
|
|
(ALLOCNO_LEFT_CONFLICTS_SIZE (conflict_allocno) >= size);
|
906 |
|
|
if (left_conflicts_size + conflict_size
|
907 |
|
|
<= ALLOCNO_AVAILABLE_REGS_NUM (conflict_allocno))
|
908 |
|
|
{
|
909 |
|
|
ALLOCNO_LEFT_CONFLICTS_SIZE (conflict_allocno) -= size;
|
910 |
|
|
continue;
|
911 |
|
|
}
|
912 |
|
|
left_conflicts_size
|
913 |
|
|
= ALLOCNO_LEFT_CONFLICTS_SIZE (conflict_allocno) - size;
|
914 |
|
|
if (uncolorable_allocnos_splay_tree[cover_class] != NULL
|
915 |
|
|
&& !ALLOCNO_SPLAY_REMOVED_P (conflict_allocno)
|
916 |
|
|
&& USE_SPLAY_P (cover_class))
|
917 |
|
|
{
|
918 |
|
|
ira_assert
|
919 |
|
|
(splay_tree_lookup
|
920 |
|
|
(uncolorable_allocnos_splay_tree[cover_class],
|
921 |
|
|
(splay_tree_key) conflict_allocno) != NULL);
|
922 |
|
|
splay_tree_remove
|
923 |
|
|
(uncolorable_allocnos_splay_tree[cover_class],
|
924 |
|
|
(splay_tree_key) conflict_allocno);
|
925 |
|
|
ALLOCNO_SPLAY_REMOVED_P (conflict_allocno) = true;
|
926 |
|
|
VEC_safe_push (ira_allocno_t, heap,
|
927 |
|
|
removed_splay_allocno_vec,
|
928 |
|
|
conflict_allocno);
|
929 |
|
|
}
|
930 |
|
|
ALLOCNO_LEFT_CONFLICTS_SIZE (conflict_allocno)
|
931 |
|
|
= left_conflicts_size;
|
932 |
|
|
if (left_conflicts_size + conflict_size
|
933 |
|
|
<= ALLOCNO_AVAILABLE_REGS_NUM (conflict_allocno))
|
934 |
|
|
{
|
935 |
|
|
delete_allocno_from_bucket
|
936 |
|
|
(conflict_allocno, &uncolorable_allocno_bucket);
|
937 |
|
|
add_allocno_to_ordered_bucket
|
938 |
|
|
(conflict_allocno, &colorable_allocno_bucket);
|
939 |
|
|
}
|
940 |
|
|
}
|
941 |
|
|
}
|
942 |
|
|
}
|
943 |
|
|
if (a == allocno)
|
944 |
|
|
break;
|
945 |
|
|
}
|
946 |
|
|
}
|
947 |
|
|
|
948 |
|
|
/* Put ALLOCNO onto the coloring stack and remove it from its bucket.
|
949 |
|
|
The allocno is in the colorable bucket if COLORABLE_P is TRUE. */
|
950 |
|
|
static void
|
951 |
|
|
remove_allocno_from_bucket_and_push (ira_allocno_t allocno, bool colorable_p)
|
952 |
|
|
{
|
953 |
|
|
enum reg_class cover_class;
|
954 |
|
|
|
955 |
|
|
if (colorable_p)
|
956 |
|
|
delete_allocno_from_bucket (allocno, &colorable_allocno_bucket);
|
957 |
|
|
else
|
958 |
|
|
delete_allocno_from_bucket (allocno, &uncolorable_allocno_bucket);
|
959 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
960 |
|
|
{
|
961 |
|
|
fprintf (ira_dump_file, " Pushing");
|
962 |
|
|
print_coalesced_allocno (allocno);
|
963 |
|
|
if (colorable_p)
|
964 |
|
|
fprintf (ira_dump_file, "\n");
|
965 |
|
|
else
|
966 |
|
|
fprintf (ira_dump_file, "(potential spill: %spri=%d, cost=%d)\n",
|
967 |
|
|
ALLOCNO_BAD_SPILL_P (allocno) ? "bad spill, " : "",
|
968 |
|
|
allocno_spill_priority (allocno), ALLOCNO_TEMP (allocno));
|
969 |
|
|
}
|
970 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
971 |
|
|
ira_assert ((colorable_p
|
972 |
|
|
&& (ALLOCNO_LEFT_CONFLICTS_SIZE (allocno)
|
973 |
|
|
+ ira_reg_class_nregs[cover_class][ALLOCNO_MODE (allocno)]
|
974 |
|
|
<= ALLOCNO_AVAILABLE_REGS_NUM (allocno)))
|
975 |
|
|
|| (! colorable_p
|
976 |
|
|
&& (ALLOCNO_LEFT_CONFLICTS_SIZE (allocno)
|
977 |
|
|
+ ira_reg_class_nregs[cover_class][ALLOCNO_MODE
|
978 |
|
|
(allocno)]
|
979 |
|
|
> ALLOCNO_AVAILABLE_REGS_NUM (allocno))));
|
980 |
|
|
if (! colorable_p)
|
981 |
|
|
ALLOCNO_MAY_BE_SPILLED_P (allocno) = true;
|
982 |
|
|
push_allocno_to_stack (allocno);
|
983 |
|
|
}
|
984 |
|
|
|
985 |
|
|
/* Put all allocnos from colorable bucket onto the coloring stack. */
|
986 |
|
|
static void
|
987 |
|
|
push_only_colorable (void)
|
988 |
|
|
{
|
989 |
|
|
sort_bucket (&colorable_allocno_bucket);
|
990 |
|
|
for (;colorable_allocno_bucket != NULL;)
|
991 |
|
|
remove_allocno_from_bucket_and_push (colorable_allocno_bucket, true);
|
992 |
|
|
}
|
993 |
|
|
|
994 |
|
|
/* Puts ALLOCNO chosen for potential spilling onto the coloring
|
995 |
|
|
stack. */
|
996 |
|
|
static void
|
997 |
|
|
push_allocno_to_spill (ira_allocno_t allocno)
|
998 |
|
|
{
|
999 |
|
|
delete_allocno_from_bucket (allocno, &uncolorable_allocno_bucket);
|
1000 |
|
|
ALLOCNO_MAY_BE_SPILLED_P (allocno) = true;
|
1001 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1002 |
|
|
fprintf (ira_dump_file, " Pushing p%d(%d) (spill for NO_REGS)\n",
|
1003 |
|
|
ALLOCNO_NUM (allocno), ALLOCNO_REGNO (allocno));
|
1004 |
|
|
push_allocno_to_stack (allocno);
|
1005 |
|
|
}
|
1006 |
|
|
|
1007 |
|
|
/* Return the frequency of exit edges (if EXIT_P) or entry from/to the
|
1008 |
|
|
loop given by its LOOP_NODE. */
|
1009 |
|
|
int
|
1010 |
|
|
ira_loop_edge_freq (ira_loop_tree_node_t loop_node, int regno, bool exit_p)
|
1011 |
|
|
{
|
1012 |
|
|
int freq, i;
|
1013 |
|
|
edge_iterator ei;
|
1014 |
|
|
edge e;
|
1015 |
|
|
VEC (edge, heap) *edges;
|
1016 |
|
|
|
1017 |
|
|
ira_assert (loop_node->loop != NULL
|
1018 |
|
|
&& (regno < 0 || regno >= FIRST_PSEUDO_REGISTER));
|
1019 |
|
|
freq = 0;
|
1020 |
|
|
if (! exit_p)
|
1021 |
|
|
{
|
1022 |
|
|
FOR_EACH_EDGE (e, ei, loop_node->loop->header->preds)
|
1023 |
|
|
if (e->src != loop_node->loop->latch
|
1024 |
|
|
&& (regno < 0
|
1025 |
|
|
|| (bitmap_bit_p (DF_LR_OUT (e->src), regno)
|
1026 |
|
|
&& bitmap_bit_p (DF_LR_IN (e->dest), regno))))
|
1027 |
|
|
freq += EDGE_FREQUENCY (e);
|
1028 |
|
|
}
|
1029 |
|
|
else
|
1030 |
|
|
{
|
1031 |
|
|
edges = get_loop_exit_edges (loop_node->loop);
|
1032 |
|
|
for (i = 0; VEC_iterate (edge, edges, i, e); i++)
|
1033 |
|
|
if (regno < 0
|
1034 |
|
|
|| (bitmap_bit_p (DF_LR_OUT (e->src), regno)
|
1035 |
|
|
&& bitmap_bit_p (DF_LR_IN (e->dest), regno)))
|
1036 |
|
|
freq += EDGE_FREQUENCY (e);
|
1037 |
|
|
VEC_free (edge, heap, edges);
|
1038 |
|
|
}
|
1039 |
|
|
|
1040 |
|
|
return REG_FREQ_FROM_EDGE_FREQ (freq);
|
1041 |
|
|
}
|
1042 |
|
|
|
1043 |
|
|
/* Calculate and return the cost of putting allocno A into memory. */
|
1044 |
|
|
static int
|
1045 |
|
|
calculate_allocno_spill_cost (ira_allocno_t a)
|
1046 |
|
|
{
|
1047 |
|
|
int regno, cost;
|
1048 |
|
|
enum machine_mode mode;
|
1049 |
|
|
enum reg_class rclass;
|
1050 |
|
|
ira_allocno_t parent_allocno;
|
1051 |
|
|
ira_loop_tree_node_t parent_node, loop_node;
|
1052 |
|
|
|
1053 |
|
|
regno = ALLOCNO_REGNO (a);
|
1054 |
|
|
cost = ALLOCNO_UPDATED_MEMORY_COST (a) - ALLOCNO_UPDATED_COVER_CLASS_COST (a);
|
1055 |
|
|
if (ALLOCNO_CAP (a) != NULL)
|
1056 |
|
|
return cost;
|
1057 |
|
|
loop_node = ALLOCNO_LOOP_TREE_NODE (a);
|
1058 |
|
|
if ((parent_node = loop_node->parent) == NULL)
|
1059 |
|
|
return cost;
|
1060 |
|
|
if ((parent_allocno = parent_node->regno_allocno_map[regno]) == NULL)
|
1061 |
|
|
return cost;
|
1062 |
|
|
mode = ALLOCNO_MODE (a);
|
1063 |
|
|
rclass = ALLOCNO_COVER_CLASS (a);
|
1064 |
|
|
if (ALLOCNO_HARD_REGNO (parent_allocno) < 0)
|
1065 |
|
|
cost -= (ira_memory_move_cost[mode][rclass][0]
|
1066 |
|
|
* ira_loop_edge_freq (loop_node, regno, true)
|
1067 |
|
|
+ ira_memory_move_cost[mode][rclass][1]
|
1068 |
|
|
* ira_loop_edge_freq (loop_node, regno, false));
|
1069 |
|
|
else
|
1070 |
|
|
cost += ((ira_memory_move_cost[mode][rclass][1]
|
1071 |
|
|
* ira_loop_edge_freq (loop_node, regno, true)
|
1072 |
|
|
+ ira_memory_move_cost[mode][rclass][0]
|
1073 |
|
|
* ira_loop_edge_freq (loop_node, regno, false))
|
1074 |
|
|
- (ira_get_register_move_cost (mode, rclass, rclass)
|
1075 |
|
|
* (ira_loop_edge_freq (loop_node, regno, false)
|
1076 |
|
|
+ ira_loop_edge_freq (loop_node, regno, true))));
|
1077 |
|
|
return cost;
|
1078 |
|
|
}
|
1079 |
|
|
|
1080 |
|
|
/* Compare keys in the splay tree used to choose best allocno for
|
1081 |
|
|
spilling. The best allocno has the minimal key. */
|
1082 |
|
|
static int
|
1083 |
|
|
allocno_spill_priority_compare (splay_tree_key k1, splay_tree_key k2)
|
1084 |
|
|
{
|
1085 |
|
|
int pri1, pri2, diff;
|
1086 |
|
|
ira_allocno_t a1 = (ira_allocno_t) k1, a2 = (ira_allocno_t) k2;
|
1087 |
|
|
|
1088 |
|
|
pri1 = (ALLOCNO_TEMP (a1)
|
1089 |
|
|
/ (ALLOCNO_LEFT_CONFLICTS_SIZE (a1)
|
1090 |
|
|
* ira_reg_class_nregs[ALLOCNO_COVER_CLASS (a1)][ALLOCNO_MODE (a1)]
|
1091 |
|
|
+ 1));
|
1092 |
|
|
pri2 = (ALLOCNO_TEMP (a2)
|
1093 |
|
|
/ (ALLOCNO_LEFT_CONFLICTS_SIZE (a2)
|
1094 |
|
|
* ira_reg_class_nregs[ALLOCNO_COVER_CLASS (a2)][ALLOCNO_MODE (a2)]
|
1095 |
|
|
+ 1));
|
1096 |
|
|
if ((diff = pri1 - pri2) != 0)
|
1097 |
|
|
return diff;
|
1098 |
|
|
if ((diff = ALLOCNO_TEMP (a1) - ALLOCNO_TEMP (a2)) != 0)
|
1099 |
|
|
return diff;
|
1100 |
|
|
return ALLOCNO_NUM (a1) - ALLOCNO_NUM (a2);
|
1101 |
|
|
}
|
1102 |
|
|
|
1103 |
|
|
/* Allocate data of SIZE for the splay trees. We allocate only spay
|
1104 |
|
|
tree roots or splay tree nodes. If you change this, please rewrite
|
1105 |
|
|
the function. */
|
1106 |
|
|
static void *
|
1107 |
|
|
splay_tree_allocate (int size, void *data ATTRIBUTE_UNUSED)
|
1108 |
|
|
{
|
1109 |
|
|
if (size != sizeof (struct splay_tree_node_s))
|
1110 |
|
|
return ira_allocate (size);
|
1111 |
|
|
return pool_alloc (splay_tree_node_pool);
|
1112 |
|
|
}
|
1113 |
|
|
|
1114 |
|
|
/* Free data NODE for the splay trees. We allocate and free only spay
|
1115 |
|
|
tree roots or splay tree nodes. If you change this, please rewrite
|
1116 |
|
|
the function. */
|
1117 |
|
|
static void
|
1118 |
|
|
splay_tree_free (void *node, void *data ATTRIBUTE_UNUSED)
|
1119 |
|
|
{
|
1120 |
|
|
int i;
|
1121 |
|
|
enum reg_class cover_class;
|
1122 |
|
|
|
1123 |
|
|
for (i = 0; i < ira_reg_class_cover_size; i++)
|
1124 |
|
|
{
|
1125 |
|
|
cover_class = ira_reg_class_cover[i];
|
1126 |
|
|
if (node == uncolorable_allocnos_splay_tree[cover_class])
|
1127 |
|
|
{
|
1128 |
|
|
ira_free (node);
|
1129 |
|
|
return;
|
1130 |
|
|
}
|
1131 |
|
|
}
|
1132 |
|
|
pool_free (splay_tree_node_pool, node);
|
1133 |
|
|
}
|
1134 |
|
|
|
1135 |
|
|
/* Push allocnos to the coloring stack. The order of allocnos in the
|
1136 |
|
|
stack defines the order for the subsequent coloring. */
|
1137 |
|
|
static void
|
1138 |
|
|
push_allocnos_to_stack (void)
|
1139 |
|
|
{
|
1140 |
|
|
ira_allocno_t allocno, a, i_allocno, *allocno_vec;
|
1141 |
|
|
enum reg_class cover_class, rclass;
|
1142 |
|
|
int allocno_pri, i_allocno_pri, allocno_cost, i_allocno_cost;
|
1143 |
|
|
int i, j, num, cover_class_allocnos_num[N_REG_CLASSES];
|
1144 |
|
|
ira_allocno_t *cover_class_allocnos[N_REG_CLASSES];
|
1145 |
|
|
int cost;
|
1146 |
|
|
|
1147 |
|
|
/* Initialize. */
|
1148 |
|
|
VEC_truncate(ira_allocno_t, removed_splay_allocno_vec, 0);
|
1149 |
|
|
for (i = 0; i < ira_reg_class_cover_size; i++)
|
1150 |
|
|
{
|
1151 |
|
|
cover_class = ira_reg_class_cover[i];
|
1152 |
|
|
cover_class_allocnos_num[cover_class] = 0;
|
1153 |
|
|
cover_class_allocnos[cover_class] = NULL;
|
1154 |
|
|
uncolorable_allocnos_splay_tree[cover_class] = NULL;
|
1155 |
|
|
}
|
1156 |
|
|
/* Calculate uncolorable allocno spill costs. */
|
1157 |
|
|
for (allocno = uncolorable_allocno_bucket;
|
1158 |
|
|
allocno != NULL;
|
1159 |
|
|
allocno = ALLOCNO_NEXT_BUCKET_ALLOCNO (allocno))
|
1160 |
|
|
if ((cover_class = ALLOCNO_COVER_CLASS (allocno)) != NO_REGS)
|
1161 |
|
|
{
|
1162 |
|
|
cover_class_allocnos_num[cover_class]++;
|
1163 |
|
|
cost = 0;
|
1164 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
1165 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1166 |
|
|
{
|
1167 |
|
|
cost += calculate_allocno_spill_cost (a);
|
1168 |
|
|
if (a == allocno)
|
1169 |
|
|
break;
|
1170 |
|
|
}
|
1171 |
|
|
/* ??? Remove cost of copies between the coalesced
|
1172 |
|
|
allocnos. */
|
1173 |
|
|
ALLOCNO_TEMP (allocno) = cost;
|
1174 |
|
|
}
|
1175 |
|
|
/* Define place where to put uncolorable allocnos of the same cover
|
1176 |
|
|
class. */
|
1177 |
|
|
for (num = i = 0; i < ira_reg_class_cover_size; i++)
|
1178 |
|
|
{
|
1179 |
|
|
cover_class = ira_reg_class_cover[i];
|
1180 |
|
|
ira_assert (cover_class_allocnos_num[cover_class]
|
1181 |
|
|
== uncolorable_allocnos_num[cover_class]);
|
1182 |
|
|
if (cover_class_allocnos_num[cover_class] != 0)
|
1183 |
|
|
{
|
1184 |
|
|
cover_class_allocnos[cover_class] = allocnos_for_spilling + num;
|
1185 |
|
|
num += cover_class_allocnos_num[cover_class];
|
1186 |
|
|
cover_class_allocnos_num[cover_class] = 0;
|
1187 |
|
|
}
|
1188 |
|
|
if (USE_SPLAY_P (cover_class))
|
1189 |
|
|
uncolorable_allocnos_splay_tree[cover_class]
|
1190 |
|
|
= splay_tree_new_with_allocator (allocno_spill_priority_compare,
|
1191 |
|
|
NULL, NULL, splay_tree_allocate,
|
1192 |
|
|
splay_tree_free, NULL);
|
1193 |
|
|
}
|
1194 |
|
|
ira_assert (num <= ira_allocnos_num);
|
1195 |
|
|
/* Collect uncolorable allocnos of each cover class. */
|
1196 |
|
|
for (allocno = uncolorable_allocno_bucket;
|
1197 |
|
|
allocno != NULL;
|
1198 |
|
|
allocno = ALLOCNO_NEXT_BUCKET_ALLOCNO (allocno))
|
1199 |
|
|
if ((cover_class = ALLOCNO_COVER_CLASS (allocno)) != NO_REGS)
|
1200 |
|
|
{
|
1201 |
|
|
cover_class_allocnos
|
1202 |
|
|
[cover_class][cover_class_allocnos_num[cover_class]++] = allocno;
|
1203 |
|
|
if (uncolorable_allocnos_splay_tree[cover_class] != NULL)
|
1204 |
|
|
splay_tree_insert (uncolorable_allocnos_splay_tree[cover_class],
|
1205 |
|
|
(splay_tree_key) allocno,
|
1206 |
|
|
(splay_tree_value) allocno);
|
1207 |
|
|
}
|
1208 |
|
|
for (;;)
|
1209 |
|
|
{
|
1210 |
|
|
push_only_colorable ();
|
1211 |
|
|
allocno = uncolorable_allocno_bucket;
|
1212 |
|
|
if (allocno == NULL)
|
1213 |
|
|
break;
|
1214 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
1215 |
|
|
if (cover_class == NO_REGS)
|
1216 |
|
|
{
|
1217 |
|
|
push_allocno_to_spill (allocno);
|
1218 |
|
|
continue;
|
1219 |
|
|
}
|
1220 |
|
|
/* Potential spilling. */
|
1221 |
|
|
ira_assert
|
1222 |
|
|
(ira_reg_class_nregs[cover_class][ALLOCNO_MODE (allocno)] > 0);
|
1223 |
|
|
if (USE_SPLAY_P (cover_class))
|
1224 |
|
|
{
|
1225 |
|
|
for (;VEC_length (ira_allocno_t, removed_splay_allocno_vec) != 0;)
|
1226 |
|
|
{
|
1227 |
|
|
allocno = VEC_pop (ira_allocno_t, removed_splay_allocno_vec);
|
1228 |
|
|
ALLOCNO_SPLAY_REMOVED_P (allocno) = false;
|
1229 |
|
|
rclass = ALLOCNO_COVER_CLASS (allocno);
|
1230 |
|
|
if (ALLOCNO_LEFT_CONFLICTS_SIZE (allocno)
|
1231 |
|
|
+ ira_reg_class_nregs [rclass][ALLOCNO_MODE (allocno)]
|
1232 |
|
|
> ALLOCNO_AVAILABLE_REGS_NUM (allocno))
|
1233 |
|
|
splay_tree_insert
|
1234 |
|
|
(uncolorable_allocnos_splay_tree[rclass],
|
1235 |
|
|
(splay_tree_key) allocno, (splay_tree_value) allocno);
|
1236 |
|
|
}
|
1237 |
|
|
allocno = ((ira_allocno_t)
|
1238 |
|
|
splay_tree_min
|
1239 |
|
|
(uncolorable_allocnos_splay_tree[cover_class])->key);
|
1240 |
|
|
splay_tree_remove (uncolorable_allocnos_splay_tree[cover_class],
|
1241 |
|
|
(splay_tree_key) allocno);
|
1242 |
|
|
}
|
1243 |
|
|
else
|
1244 |
|
|
{
|
1245 |
|
|
num = cover_class_allocnos_num[cover_class];
|
1246 |
|
|
ira_assert (num > 0);
|
1247 |
|
|
allocno_vec = cover_class_allocnos[cover_class];
|
1248 |
|
|
allocno = NULL;
|
1249 |
|
|
allocno_pri = allocno_cost = 0;
|
1250 |
|
|
/* Sort uncolorable allocno to find the one with the lowest
|
1251 |
|
|
spill cost. */
|
1252 |
|
|
for (i = 0, j = num - 1; i <= j;)
|
1253 |
|
|
{
|
1254 |
|
|
i_allocno = allocno_vec[i];
|
1255 |
|
|
if (! ALLOCNO_IN_GRAPH_P (i_allocno)
|
1256 |
|
|
&& ALLOCNO_IN_GRAPH_P (allocno_vec[j]))
|
1257 |
|
|
{
|
1258 |
|
|
i_allocno = allocno_vec[j];
|
1259 |
|
|
allocno_vec[j] = allocno_vec[i];
|
1260 |
|
|
allocno_vec[i] = i_allocno;
|
1261 |
|
|
}
|
1262 |
|
|
if (ALLOCNO_IN_GRAPH_P (i_allocno))
|
1263 |
|
|
{
|
1264 |
|
|
i++;
|
1265 |
|
|
ira_assert (ALLOCNO_TEMP (i_allocno) != INT_MAX);
|
1266 |
|
|
i_allocno_cost = ALLOCNO_TEMP (i_allocno);
|
1267 |
|
|
i_allocno_pri = allocno_spill_priority (i_allocno);
|
1268 |
|
|
if (allocno == NULL
|
1269 |
|
|
|| (! ALLOCNO_BAD_SPILL_P (i_allocno)
|
1270 |
|
|
&& ALLOCNO_BAD_SPILL_P (allocno))
|
1271 |
|
|
|| (! (ALLOCNO_BAD_SPILL_P (i_allocno)
|
1272 |
|
|
&& ! ALLOCNO_BAD_SPILL_P (allocno))
|
1273 |
|
|
&& (allocno_pri > i_allocno_pri
|
1274 |
|
|
|| (allocno_pri == i_allocno_pri
|
1275 |
|
|
&& (allocno_cost > i_allocno_cost
|
1276 |
|
|
|| (allocno_cost == i_allocno_cost
|
1277 |
|
|
&& (ALLOCNO_NUM (allocno)
|
1278 |
|
|
> ALLOCNO_NUM (i_allocno))))))))
|
1279 |
|
|
{
|
1280 |
|
|
allocno = i_allocno;
|
1281 |
|
|
allocno_cost = i_allocno_cost;
|
1282 |
|
|
allocno_pri = i_allocno_pri;
|
1283 |
|
|
}
|
1284 |
|
|
}
|
1285 |
|
|
if (! ALLOCNO_IN_GRAPH_P (allocno_vec[j]))
|
1286 |
|
|
j--;
|
1287 |
|
|
}
|
1288 |
|
|
ira_assert (allocno != NULL && j >= 0);
|
1289 |
|
|
cover_class_allocnos_num[cover_class] = j + 1;
|
1290 |
|
|
}
|
1291 |
|
|
ira_assert (ALLOCNO_IN_GRAPH_P (allocno)
|
1292 |
|
|
&& ALLOCNO_COVER_CLASS (allocno) == cover_class
|
1293 |
|
|
&& (ALLOCNO_LEFT_CONFLICTS_SIZE (allocno)
|
1294 |
|
|
+ ira_reg_class_nregs[cover_class][ALLOCNO_MODE
|
1295 |
|
|
(allocno)]
|
1296 |
|
|
> ALLOCNO_AVAILABLE_REGS_NUM (allocno)));
|
1297 |
|
|
remove_allocno_from_bucket_and_push (allocno, false);
|
1298 |
|
|
}
|
1299 |
|
|
ira_assert (colorable_allocno_bucket == NULL
|
1300 |
|
|
&& uncolorable_allocno_bucket == NULL);
|
1301 |
|
|
for (i = 0; i < ira_reg_class_cover_size; i++)
|
1302 |
|
|
{
|
1303 |
|
|
cover_class = ira_reg_class_cover[i];
|
1304 |
|
|
ira_assert (uncolorable_allocnos_num[cover_class] == 0);
|
1305 |
|
|
if (uncolorable_allocnos_splay_tree[cover_class] != NULL)
|
1306 |
|
|
splay_tree_delete (uncolorable_allocnos_splay_tree[cover_class]);
|
1307 |
|
|
}
|
1308 |
|
|
}
|
1309 |
|
|
|
1310 |
|
|
/* Pop the coloring stack and assign hard registers to the popped
|
1311 |
|
|
allocnos. */
|
1312 |
|
|
static void
|
1313 |
|
|
pop_allocnos_from_stack (void)
|
1314 |
|
|
{
|
1315 |
|
|
ira_allocno_t allocno;
|
1316 |
|
|
enum reg_class cover_class;
|
1317 |
|
|
|
1318 |
|
|
for (;VEC_length (ira_allocno_t, allocno_stack_vec) != 0;)
|
1319 |
|
|
{
|
1320 |
|
|
allocno = VEC_pop (ira_allocno_t, allocno_stack_vec);
|
1321 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
1322 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1323 |
|
|
{
|
1324 |
|
|
fprintf (ira_dump_file, " Popping");
|
1325 |
|
|
print_coalesced_allocno (allocno);
|
1326 |
|
|
fprintf (ira_dump_file, " -- ");
|
1327 |
|
|
}
|
1328 |
|
|
if (cover_class == NO_REGS)
|
1329 |
|
|
{
|
1330 |
|
|
ALLOCNO_HARD_REGNO (allocno) = -1;
|
1331 |
|
|
ALLOCNO_ASSIGNED_P (allocno) = true;
|
1332 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (allocno) == NULL);
|
1333 |
|
|
ira_assert
|
1334 |
|
|
(ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (allocno) == NULL);
|
1335 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1336 |
|
|
fprintf (ira_dump_file, "assign memory\n");
|
1337 |
|
|
}
|
1338 |
|
|
else if (assign_hard_reg (allocno, false))
|
1339 |
|
|
{
|
1340 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1341 |
|
|
fprintf (ira_dump_file, "assign reg %d\n",
|
1342 |
|
|
ALLOCNO_HARD_REGNO (allocno));
|
1343 |
|
|
}
|
1344 |
|
|
else if (ALLOCNO_ASSIGNED_P (allocno))
|
1345 |
|
|
{
|
1346 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1347 |
|
|
fprintf (ira_dump_file, "spill\n");
|
1348 |
|
|
}
|
1349 |
|
|
ALLOCNO_IN_GRAPH_P (allocno) = true;
|
1350 |
|
|
}
|
1351 |
|
|
}
|
1352 |
|
|
|
1353 |
|
|
/* Set up number of available hard registers for ALLOCNO. */
|
1354 |
|
|
static void
|
1355 |
|
|
setup_allocno_available_regs_num (ira_allocno_t allocno)
|
1356 |
|
|
{
|
1357 |
|
|
int i, n, hard_regs_num, hard_regno;
|
1358 |
|
|
enum machine_mode mode;
|
1359 |
|
|
enum reg_class cover_class;
|
1360 |
|
|
ira_allocno_t a;
|
1361 |
|
|
HARD_REG_SET temp_set;
|
1362 |
|
|
|
1363 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
1364 |
|
|
ALLOCNO_AVAILABLE_REGS_NUM (allocno) = ira_available_class_regs[cover_class];
|
1365 |
|
|
if (cover_class == NO_REGS)
|
1366 |
|
|
return;
|
1367 |
|
|
CLEAR_HARD_REG_SET (temp_set);
|
1368 |
|
|
ira_assert (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) == allocno);
|
1369 |
|
|
hard_regs_num = ira_class_hard_regs_num[cover_class];
|
1370 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
1371 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1372 |
|
|
{
|
1373 |
|
|
IOR_HARD_REG_SET (temp_set, ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a));
|
1374 |
|
|
if (a == allocno)
|
1375 |
|
|
break;
|
1376 |
|
|
}
|
1377 |
|
|
mode = ALLOCNO_MODE (allocno);
|
1378 |
|
|
for (n = 0, i = hard_regs_num - 1; i >= 0; i--)
|
1379 |
|
|
{
|
1380 |
|
|
hard_regno = ira_class_hard_regs[cover_class][i];
|
1381 |
|
|
if (TEST_HARD_REG_BIT (temp_set, hard_regno)
|
1382 |
|
|
|| TEST_HARD_REG_BIT (prohibited_class_mode_regs[cover_class][mode],
|
1383 |
|
|
hard_regno))
|
1384 |
|
|
n++;
|
1385 |
|
|
}
|
1386 |
|
|
if (internal_flag_ira_verbose > 2 && n > 0 && ira_dump_file != NULL)
|
1387 |
|
|
fprintf (ira_dump_file, " Reg %d of %s has %d regs less\n",
|
1388 |
|
|
ALLOCNO_REGNO (allocno), reg_class_names[cover_class], n);
|
1389 |
|
|
ALLOCNO_AVAILABLE_REGS_NUM (allocno) -= n;
|
1390 |
|
|
}
|
1391 |
|
|
|
1392 |
|
|
/* Set up ALLOCNO_LEFT_CONFLICTS_SIZE for ALLOCNO. */
|
1393 |
|
|
static void
|
1394 |
|
|
setup_allocno_left_conflicts_size (ira_allocno_t allocno)
|
1395 |
|
|
{
|
1396 |
|
|
int i, hard_regs_num, hard_regno, conflict_allocnos_size;
|
1397 |
|
|
ira_allocno_t a, conflict_allocno;
|
1398 |
|
|
enum reg_class cover_class;
|
1399 |
|
|
HARD_REG_SET temp_set;
|
1400 |
|
|
ira_allocno_conflict_iterator aci;
|
1401 |
|
|
|
1402 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
1403 |
|
|
hard_regs_num = ira_class_hard_regs_num[cover_class];
|
1404 |
|
|
CLEAR_HARD_REG_SET (temp_set);
|
1405 |
|
|
ira_assert (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) == allocno);
|
1406 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
1407 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1408 |
|
|
{
|
1409 |
|
|
IOR_HARD_REG_SET (temp_set, ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a));
|
1410 |
|
|
if (a == allocno)
|
1411 |
|
|
break;
|
1412 |
|
|
}
|
1413 |
|
|
AND_HARD_REG_SET (temp_set, reg_class_contents[cover_class]);
|
1414 |
|
|
AND_COMPL_HARD_REG_SET (temp_set, ira_no_alloc_regs);
|
1415 |
|
|
conflict_allocnos_size = 0;
|
1416 |
|
|
if (! hard_reg_set_empty_p (temp_set))
|
1417 |
|
|
for (i = 0; i < (int) hard_regs_num; i++)
|
1418 |
|
|
{
|
1419 |
|
|
hard_regno = ira_class_hard_regs[cover_class][i];
|
1420 |
|
|
if (TEST_HARD_REG_BIT (temp_set, hard_regno))
|
1421 |
|
|
{
|
1422 |
|
|
conflict_allocnos_size++;
|
1423 |
|
|
CLEAR_HARD_REG_BIT (temp_set, hard_regno);
|
1424 |
|
|
if (hard_reg_set_empty_p (temp_set))
|
1425 |
|
|
break;
|
1426 |
|
|
}
|
1427 |
|
|
}
|
1428 |
|
|
CLEAR_HARD_REG_SET (temp_set);
|
1429 |
|
|
if (allocno_coalesced_p)
|
1430 |
|
|
bitmap_clear (processed_coalesced_allocno_bitmap);
|
1431 |
|
|
if (cover_class != NO_REGS)
|
1432 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
1433 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1434 |
|
|
{
|
1435 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_allocno, aci)
|
1436 |
|
|
{
|
1437 |
|
|
conflict_allocno
|
1438 |
|
|
= ALLOCNO_FIRST_COALESCED_ALLOCNO (conflict_allocno);
|
1439 |
|
|
if (bitmap_bit_p (consideration_allocno_bitmap,
|
1440 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
1441 |
|
|
{
|
1442 |
|
|
ira_assert (cover_class
|
1443 |
|
|
== ALLOCNO_COVER_CLASS (conflict_allocno));
|
1444 |
|
|
if (allocno_coalesced_p)
|
1445 |
|
|
{
|
1446 |
|
|
if (bitmap_bit_p (processed_coalesced_allocno_bitmap,
|
1447 |
|
|
ALLOCNO_NUM (conflict_allocno)))
|
1448 |
|
|
continue;
|
1449 |
|
|
bitmap_set_bit (processed_coalesced_allocno_bitmap,
|
1450 |
|
|
ALLOCNO_NUM (conflict_allocno));
|
1451 |
|
|
}
|
1452 |
|
|
if (! ALLOCNO_ASSIGNED_P (conflict_allocno))
|
1453 |
|
|
conflict_allocnos_size
|
1454 |
|
|
+= (ira_reg_class_nregs
|
1455 |
|
|
[cover_class][ALLOCNO_MODE (conflict_allocno)]);
|
1456 |
|
|
else if ((hard_regno = ALLOCNO_HARD_REGNO (conflict_allocno))
|
1457 |
|
|
>= 0)
|
1458 |
|
|
{
|
1459 |
|
|
int last = (hard_regno
|
1460 |
|
|
+ hard_regno_nregs
|
1461 |
|
|
[hard_regno][ALLOCNO_MODE (conflict_allocno)]);
|
1462 |
|
|
|
1463 |
|
|
while (hard_regno < last)
|
1464 |
|
|
{
|
1465 |
|
|
if (! TEST_HARD_REG_BIT (temp_set, hard_regno))
|
1466 |
|
|
{
|
1467 |
|
|
conflict_allocnos_size++;
|
1468 |
|
|
SET_HARD_REG_BIT (temp_set, hard_regno);
|
1469 |
|
|
}
|
1470 |
|
|
hard_regno++;
|
1471 |
|
|
}
|
1472 |
|
|
}
|
1473 |
|
|
}
|
1474 |
|
|
}
|
1475 |
|
|
if (a == allocno)
|
1476 |
|
|
break;
|
1477 |
|
|
}
|
1478 |
|
|
ALLOCNO_LEFT_CONFLICTS_SIZE (allocno) = conflict_allocnos_size;
|
1479 |
|
|
}
|
1480 |
|
|
|
1481 |
|
|
/* Put ALLOCNO in a bucket corresponding to its number and size of its
|
1482 |
|
|
conflicting allocnos and hard registers. */
|
1483 |
|
|
static void
|
1484 |
|
|
put_allocno_into_bucket (ira_allocno_t allocno)
|
1485 |
|
|
{
|
1486 |
|
|
enum reg_class cover_class;
|
1487 |
|
|
|
1488 |
|
|
cover_class = ALLOCNO_COVER_CLASS (allocno);
|
1489 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) != allocno)
|
1490 |
|
|
return;
|
1491 |
|
|
ALLOCNO_IN_GRAPH_P (allocno) = true;
|
1492 |
|
|
setup_allocno_left_conflicts_size (allocno);
|
1493 |
|
|
setup_allocno_available_regs_num (allocno);
|
1494 |
|
|
if (ALLOCNO_LEFT_CONFLICTS_SIZE (allocno)
|
1495 |
|
|
+ ira_reg_class_nregs[cover_class][ALLOCNO_MODE (allocno)]
|
1496 |
|
|
<= ALLOCNO_AVAILABLE_REGS_NUM (allocno))
|
1497 |
|
|
add_allocno_to_bucket (allocno, &colorable_allocno_bucket);
|
1498 |
|
|
else
|
1499 |
|
|
add_allocno_to_bucket (allocno, &uncolorable_allocno_bucket);
|
1500 |
|
|
}
|
1501 |
|
|
|
1502 |
|
|
/* The function is used to sort allocnos according to their execution
|
1503 |
|
|
frequencies. */
|
1504 |
|
|
static int
|
1505 |
|
|
copy_freq_compare_func (const void *v1p, const void *v2p)
|
1506 |
|
|
{
|
1507 |
|
|
ira_copy_t cp1 = *(const ira_copy_t *) v1p, cp2 = *(const ira_copy_t *) v2p;
|
1508 |
|
|
int pri1, pri2;
|
1509 |
|
|
|
1510 |
|
|
pri1 = cp1->freq;
|
1511 |
|
|
pri2 = cp2->freq;
|
1512 |
|
|
if (pri2 - pri1)
|
1513 |
|
|
return pri2 - pri1;
|
1514 |
|
|
|
1515 |
|
|
/* If freqencies are equal, sort by copies, so that the results of
|
1516 |
|
|
qsort leave nothing to chance. */
|
1517 |
|
|
return cp1->num - cp2->num;
|
1518 |
|
|
}
|
1519 |
|
|
|
1520 |
|
|
/* Merge two sets of coalesced allocnos given correspondingly by
|
1521 |
|
|
allocnos A1 and A2 (more accurately merging A2 set into A1
|
1522 |
|
|
set). */
|
1523 |
|
|
static void
|
1524 |
|
|
merge_allocnos (ira_allocno_t a1, ira_allocno_t a2)
|
1525 |
|
|
{
|
1526 |
|
|
ira_allocno_t a, first, last, next;
|
1527 |
|
|
|
1528 |
|
|
first = ALLOCNO_FIRST_COALESCED_ALLOCNO (a1);
|
1529 |
|
|
if (first == ALLOCNO_FIRST_COALESCED_ALLOCNO (a2))
|
1530 |
|
|
return;
|
1531 |
|
|
for (last = a2, a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a2);;
|
1532 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1533 |
|
|
{
|
1534 |
|
|
ALLOCNO_FIRST_COALESCED_ALLOCNO (a) = first;
|
1535 |
|
|
if (a == a2)
|
1536 |
|
|
break;
|
1537 |
|
|
last = a;
|
1538 |
|
|
}
|
1539 |
|
|
next = ALLOCNO_NEXT_COALESCED_ALLOCNO (first);
|
1540 |
|
|
ALLOCNO_NEXT_COALESCED_ALLOCNO (first) = a2;
|
1541 |
|
|
ALLOCNO_NEXT_COALESCED_ALLOCNO (last) = next;
|
1542 |
|
|
}
|
1543 |
|
|
|
1544 |
|
|
/* Return TRUE if there are conflicting allocnos from two sets of
|
1545 |
|
|
coalesced allocnos given correspondingly by allocnos A1 and A2. If
|
1546 |
|
|
RELOAD_P is TRUE, we use live ranges to find conflicts because
|
1547 |
|
|
conflicts are represented only for allocnos of the same cover class
|
1548 |
|
|
and during the reload pass we coalesce allocnos for sharing stack
|
1549 |
|
|
memory slots. */
|
1550 |
|
|
static bool
|
1551 |
|
|
coalesced_allocno_conflict_p (ira_allocno_t a1, ira_allocno_t a2,
|
1552 |
|
|
bool reload_p)
|
1553 |
|
|
{
|
1554 |
|
|
ira_allocno_t a, conflict_allocno;
|
1555 |
|
|
ira_allocno_conflict_iterator aci;
|
1556 |
|
|
|
1557 |
|
|
if (allocno_coalesced_p)
|
1558 |
|
|
{
|
1559 |
|
|
bitmap_clear (processed_coalesced_allocno_bitmap);
|
1560 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a1);;
|
1561 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1562 |
|
|
{
|
1563 |
|
|
bitmap_set_bit (processed_coalesced_allocno_bitmap, ALLOCNO_NUM (a));
|
1564 |
|
|
if (a == a1)
|
1565 |
|
|
break;
|
1566 |
|
|
}
|
1567 |
|
|
}
|
1568 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a2);;
|
1569 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
1570 |
|
|
{
|
1571 |
|
|
if (reload_p)
|
1572 |
|
|
{
|
1573 |
|
|
for (conflict_allocno = ALLOCNO_NEXT_COALESCED_ALLOCNO (a1);;
|
1574 |
|
|
conflict_allocno
|
1575 |
|
|
= ALLOCNO_NEXT_COALESCED_ALLOCNO (conflict_allocno))
|
1576 |
|
|
{
|
1577 |
|
|
if (allocnos_have_intersected_live_ranges_p (a,
|
1578 |
|
|
conflict_allocno))
|
1579 |
|
|
return true;
|
1580 |
|
|
if (conflict_allocno == a1)
|
1581 |
|
|
break;
|
1582 |
|
|
}
|
1583 |
|
|
}
|
1584 |
|
|
else
|
1585 |
|
|
{
|
1586 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_allocno, aci)
|
1587 |
|
|
if (conflict_allocno == a1
|
1588 |
|
|
|| (allocno_coalesced_p
|
1589 |
|
|
&& bitmap_bit_p (processed_coalesced_allocno_bitmap,
|
1590 |
|
|
ALLOCNO_NUM (conflict_allocno))))
|
1591 |
|
|
return true;
|
1592 |
|
|
}
|
1593 |
|
|
if (a == a2)
|
1594 |
|
|
break;
|
1595 |
|
|
}
|
1596 |
|
|
return false;
|
1597 |
|
|
}
|
1598 |
|
|
|
1599 |
|
|
/* The major function for aggressive allocno coalescing. For the
|
1600 |
|
|
reload pass (RELOAD_P) we coalesce only spilled allocnos. If some
|
1601 |
|
|
allocnos have been coalesced, we set up flag
|
1602 |
|
|
allocno_coalesced_p. */
|
1603 |
|
|
static void
|
1604 |
|
|
coalesce_allocnos (bool reload_p)
|
1605 |
|
|
{
|
1606 |
|
|
ira_allocno_t a;
|
1607 |
|
|
ira_copy_t cp, next_cp, *sorted_copies;
|
1608 |
|
|
enum reg_class cover_class;
|
1609 |
|
|
enum machine_mode mode;
|
1610 |
|
|
unsigned int j;
|
1611 |
|
|
int i, n, cp_num, regno;
|
1612 |
|
|
bitmap_iterator bi;
|
1613 |
|
|
|
1614 |
|
|
sorted_copies = (ira_copy_t *) ira_allocate (ira_copies_num
|
1615 |
|
|
* sizeof (ira_copy_t));
|
1616 |
|
|
cp_num = 0;
|
1617 |
|
|
/* Collect copies. */
|
1618 |
|
|
EXECUTE_IF_SET_IN_BITMAP (coloring_allocno_bitmap, 0, j, bi)
|
1619 |
|
|
{
|
1620 |
|
|
a = ira_allocnos[j];
|
1621 |
|
|
regno = ALLOCNO_REGNO (a);
|
1622 |
|
|
if ((! reload_p && ALLOCNO_ASSIGNED_P (a))
|
1623 |
|
|
|| (reload_p
|
1624 |
|
|
&& (! ALLOCNO_ASSIGNED_P (a) || ALLOCNO_HARD_REGNO (a) >= 0
|
1625 |
|
|
|| (regno < ira_reg_equiv_len
|
1626 |
|
|
&& (ira_reg_equiv_const[regno] != NULL_RTX
|
1627 |
|
|
|| ira_reg_equiv_invariant_p[regno])))))
|
1628 |
|
|
continue;
|
1629 |
|
|
cover_class = ALLOCNO_COVER_CLASS (a);
|
1630 |
|
|
mode = ALLOCNO_MODE (a);
|
1631 |
|
|
for (cp = ALLOCNO_COPIES (a); cp != NULL; cp = next_cp)
|
1632 |
|
|
{
|
1633 |
|
|
if (cp->first == a)
|
1634 |
|
|
{
|
1635 |
|
|
next_cp = cp->next_first_allocno_copy;
|
1636 |
|
|
regno = ALLOCNO_REGNO (cp->second);
|
1637 |
|
|
/* For priority coloring we coalesce allocnos only with
|
1638 |
|
|
the same cover class not with intersected cover
|
1639 |
|
|
classes as it were possible. It is done for
|
1640 |
|
|
simplicity. */
|
1641 |
|
|
if ((reload_p
|
1642 |
|
|
|| (ALLOCNO_COVER_CLASS (cp->second) == cover_class
|
1643 |
|
|
&& ALLOCNO_MODE (cp->second) == mode))
|
1644 |
|
|
&& (cp->insn != NULL || cp->constraint_p)
|
1645 |
|
|
&& ((! reload_p && ! ALLOCNO_ASSIGNED_P (cp->second))
|
1646 |
|
|
|| (reload_p
|
1647 |
|
|
&& ALLOCNO_ASSIGNED_P (cp->second)
|
1648 |
|
|
&& ALLOCNO_HARD_REGNO (cp->second) < 0
|
1649 |
|
|
&& (regno >= ira_reg_equiv_len
|
1650 |
|
|
|| (! ira_reg_equiv_invariant_p[regno]
|
1651 |
|
|
&& ira_reg_equiv_const[regno] == NULL_RTX)))))
|
1652 |
|
|
sorted_copies[cp_num++] = cp;
|
1653 |
|
|
}
|
1654 |
|
|
else if (cp->second == a)
|
1655 |
|
|
next_cp = cp->next_second_allocno_copy;
|
1656 |
|
|
else
|
1657 |
|
|
gcc_unreachable ();
|
1658 |
|
|
}
|
1659 |
|
|
}
|
1660 |
|
|
qsort (sorted_copies, cp_num, sizeof (ira_copy_t), copy_freq_compare_func);
|
1661 |
|
|
/* Coalesced copies, most frequently executed first. */
|
1662 |
|
|
for (; cp_num != 0;)
|
1663 |
|
|
{
|
1664 |
|
|
for (i = 0; i < cp_num; i++)
|
1665 |
|
|
{
|
1666 |
|
|
cp = sorted_copies[i];
|
1667 |
|
|
if (! coalesced_allocno_conflict_p (cp->first, cp->second, reload_p))
|
1668 |
|
|
{
|
1669 |
|
|
allocno_coalesced_p = true;
|
1670 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1671 |
|
|
fprintf
|
1672 |
|
|
(ira_dump_file,
|
1673 |
|
|
" Coalescing copy %d:a%dr%d-a%dr%d (freq=%d)\n",
|
1674 |
|
|
cp->num, ALLOCNO_NUM (cp->first), ALLOCNO_REGNO (cp->first),
|
1675 |
|
|
ALLOCNO_NUM (cp->second), ALLOCNO_REGNO (cp->second),
|
1676 |
|
|
cp->freq);
|
1677 |
|
|
merge_allocnos (cp->first, cp->second);
|
1678 |
|
|
i++;
|
1679 |
|
|
break;
|
1680 |
|
|
}
|
1681 |
|
|
}
|
1682 |
|
|
/* Collect the rest of copies. */
|
1683 |
|
|
for (n = 0; i < cp_num; i++)
|
1684 |
|
|
{
|
1685 |
|
|
cp = sorted_copies[i];
|
1686 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (cp->first)
|
1687 |
|
|
!= ALLOCNO_FIRST_COALESCED_ALLOCNO (cp->second))
|
1688 |
|
|
sorted_copies[n++] = cp;
|
1689 |
|
|
}
|
1690 |
|
|
cp_num = n;
|
1691 |
|
|
}
|
1692 |
|
|
ira_free (sorted_copies);
|
1693 |
|
|
}
|
1694 |
|
|
|
1695 |
|
|
/* Map: allocno number -> allocno priority. */
|
1696 |
|
|
static int *allocno_priorities;
|
1697 |
|
|
|
1698 |
|
|
/* Set up priorities for N allocnos in array
|
1699 |
|
|
CONSIDERATION_ALLOCNOS. */
|
1700 |
|
|
static void
|
1701 |
|
|
setup_allocno_priorities (ira_allocno_t *consideration_allocnos, int n)
|
1702 |
|
|
{
|
1703 |
|
|
int i, length, nrefs, priority, max_priority, mult;
|
1704 |
|
|
ira_allocno_t a;
|
1705 |
|
|
|
1706 |
|
|
max_priority = 0;
|
1707 |
|
|
for (i = 0; i < n; i++)
|
1708 |
|
|
{
|
1709 |
|
|
a = consideration_allocnos[i];
|
1710 |
|
|
nrefs = ALLOCNO_NREFS (a);
|
1711 |
|
|
ira_assert (nrefs >= 0);
|
1712 |
|
|
mult = floor_log2 (ALLOCNO_NREFS (a)) + 1;
|
1713 |
|
|
ira_assert (mult >= 0);
|
1714 |
|
|
allocno_priorities[ALLOCNO_NUM (a)]
|
1715 |
|
|
= priority
|
1716 |
|
|
= (mult
|
1717 |
|
|
* (ALLOCNO_MEMORY_COST (a) - ALLOCNO_COVER_CLASS_COST (a))
|
1718 |
|
|
* ira_reg_class_nregs[ALLOCNO_COVER_CLASS (a)][ALLOCNO_MODE (a)]);
|
1719 |
|
|
if (priority < 0)
|
1720 |
|
|
priority = -priority;
|
1721 |
|
|
if (max_priority < priority)
|
1722 |
|
|
max_priority = priority;
|
1723 |
|
|
}
|
1724 |
|
|
mult = max_priority == 0 ? 1 : INT_MAX / max_priority;
|
1725 |
|
|
for (i = 0; i < n; i++)
|
1726 |
|
|
{
|
1727 |
|
|
a = consideration_allocnos[i];
|
1728 |
|
|
length = ALLOCNO_EXCESS_PRESSURE_POINTS_NUM (a);
|
1729 |
|
|
if (length <= 0)
|
1730 |
|
|
length = 1;
|
1731 |
|
|
allocno_priorities[ALLOCNO_NUM (a)]
|
1732 |
|
|
= allocno_priorities[ALLOCNO_NUM (a)] * mult / length;
|
1733 |
|
|
}
|
1734 |
|
|
}
|
1735 |
|
|
|
1736 |
|
|
/* Sort allocnos according to their priorities which are calculated
|
1737 |
|
|
analogous to ones in file `global.c'. */
|
1738 |
|
|
static int
|
1739 |
|
|
allocno_priority_compare_func (const void *v1p, const void *v2p)
|
1740 |
|
|
{
|
1741 |
|
|
ira_allocno_t a1 = *(const ira_allocno_t *) v1p;
|
1742 |
|
|
ira_allocno_t a2 = *(const ira_allocno_t *) v2p;
|
1743 |
|
|
int pri1, pri2;
|
1744 |
|
|
|
1745 |
|
|
pri1 = allocno_priorities[ALLOCNO_NUM (a1)];
|
1746 |
|
|
pri2 = allocno_priorities[ALLOCNO_NUM (a2)];
|
1747 |
|
|
if (pri2 - pri1)
|
1748 |
|
|
return pri2 - pri1;
|
1749 |
|
|
|
1750 |
|
|
/* If regs are equally good, sort by allocnos, so that the results of
|
1751 |
|
|
qsort leave nothing to chance. */
|
1752 |
|
|
return ALLOCNO_NUM (a1) - ALLOCNO_NUM (a2);
|
1753 |
|
|
}
|
1754 |
|
|
|
1755 |
|
|
/* Chaitin-Briggs coloring for allocnos in COLORING_ALLOCNO_BITMAP
|
1756 |
|
|
taking into account allocnos in CONSIDERATION_ALLOCNO_BITMAP. */
|
1757 |
|
|
static void
|
1758 |
|
|
color_allocnos (void)
|
1759 |
|
|
{
|
1760 |
|
|
unsigned int i, n;
|
1761 |
|
|
bitmap_iterator bi;
|
1762 |
|
|
ira_allocno_t a;
|
1763 |
|
|
|
1764 |
|
|
allocno_coalesced_p = false;
|
1765 |
|
|
processed_coalesced_allocno_bitmap = ira_allocate_bitmap ();
|
1766 |
|
|
if (flag_ira_coalesce)
|
1767 |
|
|
coalesce_allocnos (false);
|
1768 |
|
|
if (flag_ira_algorithm == IRA_ALGORITHM_PRIORITY)
|
1769 |
|
|
{
|
1770 |
|
|
n = 0;
|
1771 |
|
|
EXECUTE_IF_SET_IN_BITMAP (coloring_allocno_bitmap, 0, i, bi)
|
1772 |
|
|
{
|
1773 |
|
|
a = ira_allocnos[i];
|
1774 |
|
|
if (ALLOCNO_COVER_CLASS (a) == NO_REGS)
|
1775 |
|
|
{
|
1776 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
1777 |
|
|
ALLOCNO_ASSIGNED_P (a) = true;
|
1778 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (a) == NULL);
|
1779 |
|
|
ira_assert (ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a) == NULL);
|
1780 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1781 |
|
|
{
|
1782 |
|
|
fprintf (ira_dump_file, " Spill");
|
1783 |
|
|
print_coalesced_allocno (a);
|
1784 |
|
|
fprintf (ira_dump_file, "\n");
|
1785 |
|
|
}
|
1786 |
|
|
continue;
|
1787 |
|
|
}
|
1788 |
|
|
sorted_allocnos[n++] = a;
|
1789 |
|
|
}
|
1790 |
|
|
if (n != 0)
|
1791 |
|
|
{
|
1792 |
|
|
setup_allocno_priorities (sorted_allocnos, n);
|
1793 |
|
|
qsort (sorted_allocnos, n, sizeof (ira_allocno_t),
|
1794 |
|
|
allocno_priority_compare_func);
|
1795 |
|
|
for (i = 0; i < n; i++)
|
1796 |
|
|
{
|
1797 |
|
|
a = sorted_allocnos[i];
|
1798 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1799 |
|
|
{
|
1800 |
|
|
fprintf (ira_dump_file, " ");
|
1801 |
|
|
print_coalesced_allocno (a);
|
1802 |
|
|
fprintf (ira_dump_file, " -- ");
|
1803 |
|
|
}
|
1804 |
|
|
if (assign_hard_reg (a, false))
|
1805 |
|
|
{
|
1806 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1807 |
|
|
fprintf (ira_dump_file, "assign hard reg %d\n",
|
1808 |
|
|
ALLOCNO_HARD_REGNO (a));
|
1809 |
|
|
}
|
1810 |
|
|
else
|
1811 |
|
|
{
|
1812 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1813 |
|
|
fprintf (ira_dump_file, "assign memory\n");
|
1814 |
|
|
}
|
1815 |
|
|
}
|
1816 |
|
|
}
|
1817 |
|
|
}
|
1818 |
|
|
else
|
1819 |
|
|
{
|
1820 |
|
|
/* Put the allocnos into the corresponding buckets. */
|
1821 |
|
|
colorable_allocno_bucket = NULL;
|
1822 |
|
|
uncolorable_allocno_bucket = NULL;
|
1823 |
|
|
EXECUTE_IF_SET_IN_BITMAP (coloring_allocno_bitmap, 0, i, bi)
|
1824 |
|
|
{
|
1825 |
|
|
a = ira_allocnos[i];
|
1826 |
|
|
if (ALLOCNO_COVER_CLASS (a) == NO_REGS)
|
1827 |
|
|
{
|
1828 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
1829 |
|
|
ALLOCNO_ASSIGNED_P (a) = true;
|
1830 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (a) == NULL);
|
1831 |
|
|
ira_assert (ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a) == NULL);
|
1832 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
1833 |
|
|
{
|
1834 |
|
|
fprintf (ira_dump_file, " Spill");
|
1835 |
|
|
print_coalesced_allocno (a);
|
1836 |
|
|
fprintf (ira_dump_file, "\n");
|
1837 |
|
|
}
|
1838 |
|
|
continue;
|
1839 |
|
|
}
|
1840 |
|
|
put_allocno_into_bucket (a);
|
1841 |
|
|
}
|
1842 |
|
|
push_allocnos_to_stack ();
|
1843 |
|
|
pop_allocnos_from_stack ();
|
1844 |
|
|
}
|
1845 |
|
|
if (flag_ira_coalesce)
|
1846 |
|
|
/* We don't need coalesced allocnos for ira_reassign_pseudos. */
|
1847 |
|
|
EXECUTE_IF_SET_IN_BITMAP (coloring_allocno_bitmap, 0, i, bi)
|
1848 |
|
|
{
|
1849 |
|
|
a = ira_allocnos[i];
|
1850 |
|
|
ALLOCNO_FIRST_COALESCED_ALLOCNO (a) = a;
|
1851 |
|
|
ALLOCNO_NEXT_COALESCED_ALLOCNO (a) = a;
|
1852 |
|
|
}
|
1853 |
|
|
ira_free_bitmap (processed_coalesced_allocno_bitmap);
|
1854 |
|
|
allocno_coalesced_p = false;
|
1855 |
|
|
}
|
1856 |
|
|
|
1857 |
|
|
|
1858 |
|
|
|
1859 |
|
|
/* Output information about the loop given by its LOOP_TREE_NODE. */
|
1860 |
|
|
static void
|
1861 |
|
|
print_loop_title (ira_loop_tree_node_t loop_tree_node)
|
1862 |
|
|
{
|
1863 |
|
|
unsigned int j;
|
1864 |
|
|
bitmap_iterator bi;
|
1865 |
|
|
ira_loop_tree_node_t subloop_node, dest_loop_node;
|
1866 |
|
|
edge e;
|
1867 |
|
|
edge_iterator ei;
|
1868 |
|
|
|
1869 |
|
|
ira_assert (loop_tree_node->loop != NULL);
|
1870 |
|
|
fprintf (ira_dump_file,
|
1871 |
|
|
"\n Loop %d (parent %d, header bb%d, depth %d)\n bbs:",
|
1872 |
|
|
loop_tree_node->loop->num,
|
1873 |
|
|
(loop_tree_node->parent == NULL
|
1874 |
|
|
? -1 : loop_tree_node->parent->loop->num),
|
1875 |
|
|
loop_tree_node->loop->header->index,
|
1876 |
|
|
loop_depth (loop_tree_node->loop));
|
1877 |
|
|
for (subloop_node = loop_tree_node->children;
|
1878 |
|
|
subloop_node != NULL;
|
1879 |
|
|
subloop_node = subloop_node->next)
|
1880 |
|
|
if (subloop_node->bb != NULL)
|
1881 |
|
|
{
|
1882 |
|
|
fprintf (ira_dump_file, " %d", subloop_node->bb->index);
|
1883 |
|
|
FOR_EACH_EDGE (e, ei, subloop_node->bb->succs)
|
1884 |
|
|
if (e->dest != EXIT_BLOCK_PTR
|
1885 |
|
|
&& ((dest_loop_node = IRA_BB_NODE (e->dest)->parent)
|
1886 |
|
|
!= loop_tree_node))
|
1887 |
|
|
fprintf (ira_dump_file, "(->%d:l%d)",
|
1888 |
|
|
e->dest->index, dest_loop_node->loop->num);
|
1889 |
|
|
}
|
1890 |
|
|
fprintf (ira_dump_file, "\n all:");
|
1891 |
|
|
EXECUTE_IF_SET_IN_BITMAP (loop_tree_node->all_allocnos, 0, j, bi)
|
1892 |
|
|
fprintf (ira_dump_file, " %dr%d", j, ALLOCNO_REGNO (ira_allocnos[j]));
|
1893 |
|
|
fprintf (ira_dump_file, "\n modified regnos:");
|
1894 |
|
|
EXECUTE_IF_SET_IN_BITMAP (loop_tree_node->modified_regnos, 0, j, bi)
|
1895 |
|
|
fprintf (ira_dump_file, " %d", j);
|
1896 |
|
|
fprintf (ira_dump_file, "\n border:");
|
1897 |
|
|
EXECUTE_IF_SET_IN_BITMAP (loop_tree_node->border_allocnos, 0, j, bi)
|
1898 |
|
|
fprintf (ira_dump_file, " %dr%d", j, ALLOCNO_REGNO (ira_allocnos[j]));
|
1899 |
|
|
fprintf (ira_dump_file, "\n Pressure:");
|
1900 |
|
|
for (j = 0; (int) j < ira_reg_class_cover_size; j++)
|
1901 |
|
|
{
|
1902 |
|
|
enum reg_class cover_class;
|
1903 |
|
|
|
1904 |
|
|
cover_class = ira_reg_class_cover[j];
|
1905 |
|
|
if (loop_tree_node->reg_pressure[cover_class] == 0)
|
1906 |
|
|
continue;
|
1907 |
|
|
fprintf (ira_dump_file, " %s=%d", reg_class_names[cover_class],
|
1908 |
|
|
loop_tree_node->reg_pressure[cover_class]);
|
1909 |
|
|
}
|
1910 |
|
|
fprintf (ira_dump_file, "\n");
|
1911 |
|
|
}
|
1912 |
|
|
|
1913 |
|
|
/* Color the allocnos inside loop (in the extreme case it can be all
|
1914 |
|
|
of the function) given the corresponding LOOP_TREE_NODE. The
|
1915 |
|
|
function is called for each loop during top-down traverse of the
|
1916 |
|
|
loop tree. */
|
1917 |
|
|
static void
|
1918 |
|
|
color_pass (ira_loop_tree_node_t loop_tree_node)
|
1919 |
|
|
{
|
1920 |
|
|
int regno, hard_regno, index = -1;
|
1921 |
|
|
int cost, exit_freq, enter_freq;
|
1922 |
|
|
unsigned int j;
|
1923 |
|
|
bitmap_iterator bi;
|
1924 |
|
|
enum machine_mode mode;
|
1925 |
|
|
enum reg_class rclass, cover_class;
|
1926 |
|
|
ira_allocno_t a, subloop_allocno;
|
1927 |
|
|
ira_loop_tree_node_t subloop_node;
|
1928 |
|
|
|
1929 |
|
|
ira_assert (loop_tree_node->bb == NULL);
|
1930 |
|
|
if (internal_flag_ira_verbose > 1 && ira_dump_file != NULL)
|
1931 |
|
|
print_loop_title (loop_tree_node);
|
1932 |
|
|
|
1933 |
|
|
bitmap_copy (coloring_allocno_bitmap, loop_tree_node->all_allocnos);
|
1934 |
|
|
bitmap_copy (consideration_allocno_bitmap, coloring_allocno_bitmap);
|
1935 |
|
|
EXECUTE_IF_SET_IN_BITMAP (consideration_allocno_bitmap, 0, j, bi)
|
1936 |
|
|
{
|
1937 |
|
|
a = ira_allocnos[j];
|
1938 |
|
|
if (! ALLOCNO_ASSIGNED_P (a))
|
1939 |
|
|
continue;
|
1940 |
|
|
bitmap_clear_bit (coloring_allocno_bitmap, ALLOCNO_NUM (a));
|
1941 |
|
|
}
|
1942 |
|
|
/* Color all mentioned allocnos including transparent ones. */
|
1943 |
|
|
color_allocnos ();
|
1944 |
|
|
/* Process caps. They are processed just once. */
|
1945 |
|
|
if (flag_ira_region == IRA_REGION_MIXED
|
1946 |
|
|
|| flag_ira_region == IRA_REGION_ALL)
|
1947 |
|
|
EXECUTE_IF_SET_IN_BITMAP (loop_tree_node->all_allocnos, 0, j, bi)
|
1948 |
|
|
{
|
1949 |
|
|
a = ira_allocnos[j];
|
1950 |
|
|
if (ALLOCNO_CAP_MEMBER (a) == NULL)
|
1951 |
|
|
continue;
|
1952 |
|
|
/* Remove from processing in the next loop. */
|
1953 |
|
|
bitmap_clear_bit (consideration_allocno_bitmap, j);
|
1954 |
|
|
rclass = ALLOCNO_COVER_CLASS (a);
|
1955 |
|
|
if (flag_ira_region == IRA_REGION_MIXED
|
1956 |
|
|
&& (loop_tree_node->reg_pressure[rclass]
|
1957 |
|
|
<= ira_available_class_regs[rclass]))
|
1958 |
|
|
{
|
1959 |
|
|
mode = ALLOCNO_MODE (a);
|
1960 |
|
|
hard_regno = ALLOCNO_HARD_REGNO (a);
|
1961 |
|
|
if (hard_regno >= 0)
|
1962 |
|
|
{
|
1963 |
|
|
index = ira_class_hard_reg_index[rclass][hard_regno];
|
1964 |
|
|
ira_assert (index >= 0);
|
1965 |
|
|
}
|
1966 |
|
|
regno = ALLOCNO_REGNO (a);
|
1967 |
|
|
subloop_allocno = ALLOCNO_CAP_MEMBER (a);
|
1968 |
|
|
subloop_node = ALLOCNO_LOOP_TREE_NODE (subloop_allocno);
|
1969 |
|
|
ira_assert (!ALLOCNO_ASSIGNED_P (subloop_allocno));
|
1970 |
|
|
ALLOCNO_HARD_REGNO (subloop_allocno) = hard_regno;
|
1971 |
|
|
ALLOCNO_ASSIGNED_P (subloop_allocno) = true;
|
1972 |
|
|
if (hard_regno >= 0)
|
1973 |
|
|
update_copy_costs (subloop_allocno, true);
|
1974 |
|
|
/* We don't need updated costs anymore: */
|
1975 |
|
|
ira_free_allocno_updated_costs (subloop_allocno);
|
1976 |
|
|
}
|
1977 |
|
|
}
|
1978 |
|
|
/* Update costs of the corresponding allocnos (not caps) in the
|
1979 |
|
|
subloops. */
|
1980 |
|
|
for (subloop_node = loop_tree_node->subloops;
|
1981 |
|
|
subloop_node != NULL;
|
1982 |
|
|
subloop_node = subloop_node->subloop_next)
|
1983 |
|
|
{
|
1984 |
|
|
ira_assert (subloop_node->bb == NULL);
|
1985 |
|
|
EXECUTE_IF_SET_IN_BITMAP (consideration_allocno_bitmap, 0, j, bi)
|
1986 |
|
|
{
|
1987 |
|
|
a = ira_allocnos[j];
|
1988 |
|
|
ira_assert (ALLOCNO_CAP_MEMBER (a) == NULL);
|
1989 |
|
|
mode = ALLOCNO_MODE (a);
|
1990 |
|
|
rclass = ALLOCNO_COVER_CLASS (a);
|
1991 |
|
|
hard_regno = ALLOCNO_HARD_REGNO (a);
|
1992 |
|
|
/* Use hard register class here. ??? */
|
1993 |
|
|
if (hard_regno >= 0)
|
1994 |
|
|
{
|
1995 |
|
|
index = ira_class_hard_reg_index[rclass][hard_regno];
|
1996 |
|
|
ira_assert (index >= 0);
|
1997 |
|
|
}
|
1998 |
|
|
regno = ALLOCNO_REGNO (a);
|
1999 |
|
|
/* ??? conflict costs */
|
2000 |
|
|
subloop_allocno = subloop_node->regno_allocno_map[regno];
|
2001 |
|
|
if (subloop_allocno == NULL
|
2002 |
|
|
|| ALLOCNO_CAP (subloop_allocno) != NULL)
|
2003 |
|
|
continue;
|
2004 |
|
|
ira_assert (ALLOCNO_COVER_CLASS (subloop_allocno) == rclass);
|
2005 |
|
|
ira_assert (bitmap_bit_p (subloop_node->all_allocnos,
|
2006 |
|
|
ALLOCNO_NUM (subloop_allocno)));
|
2007 |
|
|
if ((flag_ira_region == IRA_REGION_MIXED)
|
2008 |
|
|
&& (loop_tree_node->reg_pressure[rclass]
|
2009 |
|
|
<= ira_available_class_regs[rclass]))
|
2010 |
|
|
{
|
2011 |
|
|
if (! ALLOCNO_ASSIGNED_P (subloop_allocno))
|
2012 |
|
|
{
|
2013 |
|
|
ALLOCNO_HARD_REGNO (subloop_allocno) = hard_regno;
|
2014 |
|
|
ALLOCNO_ASSIGNED_P (subloop_allocno) = true;
|
2015 |
|
|
if (hard_regno >= 0)
|
2016 |
|
|
update_copy_costs (subloop_allocno, true);
|
2017 |
|
|
/* We don't need updated costs anymore: */
|
2018 |
|
|
ira_free_allocno_updated_costs (subloop_allocno);
|
2019 |
|
|
}
|
2020 |
|
|
continue;
|
2021 |
|
|
}
|
2022 |
|
|
exit_freq = ira_loop_edge_freq (subloop_node, regno, true);
|
2023 |
|
|
enter_freq = ira_loop_edge_freq (subloop_node, regno, false);
|
2024 |
|
|
ira_assert (regno < ira_reg_equiv_len);
|
2025 |
|
|
if (ira_reg_equiv_invariant_p[regno]
|
2026 |
|
|
|| ira_reg_equiv_const[regno] != NULL_RTX)
|
2027 |
|
|
{
|
2028 |
|
|
if (! ALLOCNO_ASSIGNED_P (subloop_allocno))
|
2029 |
|
|
{
|
2030 |
|
|
ALLOCNO_HARD_REGNO (subloop_allocno) = hard_regno;
|
2031 |
|
|
ALLOCNO_ASSIGNED_P (subloop_allocno) = true;
|
2032 |
|
|
if (hard_regno >= 0)
|
2033 |
|
|
update_copy_costs (subloop_allocno, true);
|
2034 |
|
|
/* We don't need updated costs anymore: */
|
2035 |
|
|
ira_free_allocno_updated_costs (subloop_allocno);
|
2036 |
|
|
}
|
2037 |
|
|
}
|
2038 |
|
|
else if (hard_regno < 0)
|
2039 |
|
|
{
|
2040 |
|
|
ALLOCNO_UPDATED_MEMORY_COST (subloop_allocno)
|
2041 |
|
|
-= ((ira_memory_move_cost[mode][rclass][1] * enter_freq)
|
2042 |
|
|
+ (ira_memory_move_cost[mode][rclass][0] * exit_freq));
|
2043 |
|
|
}
|
2044 |
|
|
else
|
2045 |
|
|
{
|
2046 |
|
|
cover_class = ALLOCNO_COVER_CLASS (subloop_allocno);
|
2047 |
|
|
cost = (ira_get_register_move_cost (mode, rclass, rclass)
|
2048 |
|
|
* (exit_freq + enter_freq));
|
2049 |
|
|
ira_allocate_and_set_or_copy_costs
|
2050 |
|
|
(&ALLOCNO_UPDATED_HARD_REG_COSTS (subloop_allocno), cover_class,
|
2051 |
|
|
ALLOCNO_UPDATED_COVER_CLASS_COST (subloop_allocno),
|
2052 |
|
|
ALLOCNO_HARD_REG_COSTS (subloop_allocno));
|
2053 |
|
|
ira_allocate_and_set_or_copy_costs
|
2054 |
|
|
(&ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (subloop_allocno),
|
2055 |
|
|
cover_class, 0,
|
2056 |
|
|
ALLOCNO_CONFLICT_HARD_REG_COSTS (subloop_allocno));
|
2057 |
|
|
ALLOCNO_UPDATED_HARD_REG_COSTS (subloop_allocno)[index] -= cost;
|
2058 |
|
|
ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (subloop_allocno)[index]
|
2059 |
|
|
-= cost;
|
2060 |
|
|
if (ALLOCNO_UPDATED_COVER_CLASS_COST (subloop_allocno)
|
2061 |
|
|
> ALLOCNO_UPDATED_HARD_REG_COSTS (subloop_allocno)[index])
|
2062 |
|
|
ALLOCNO_UPDATED_COVER_CLASS_COST (subloop_allocno)
|
2063 |
|
|
= ALLOCNO_UPDATED_HARD_REG_COSTS (subloop_allocno)[index];
|
2064 |
|
|
ALLOCNO_UPDATED_MEMORY_COST (subloop_allocno)
|
2065 |
|
|
+= (ira_memory_move_cost[mode][rclass][0] * enter_freq
|
2066 |
|
|
+ ira_memory_move_cost[mode][rclass][1] * exit_freq);
|
2067 |
|
|
}
|
2068 |
|
|
}
|
2069 |
|
|
}
|
2070 |
|
|
}
|
2071 |
|
|
|
2072 |
|
|
/* Initialize the common data for coloring and calls functions to do
|
2073 |
|
|
Chaitin-Briggs and regional coloring. */
|
2074 |
|
|
static void
|
2075 |
|
|
do_coloring (void)
|
2076 |
|
|
{
|
2077 |
|
|
coloring_allocno_bitmap = ira_allocate_bitmap ();
|
2078 |
|
|
allocnos_for_spilling
|
2079 |
|
|
= (ira_allocno_t *) ira_allocate (sizeof (ira_allocno_t)
|
2080 |
|
|
* ira_allocnos_num);
|
2081 |
|
|
splay_tree_node_pool = create_alloc_pool ("splay tree nodes",
|
2082 |
|
|
sizeof (struct splay_tree_node_s),
|
2083 |
|
|
100);
|
2084 |
|
|
if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL)
|
2085 |
|
|
fprintf (ira_dump_file, "\n**** Allocnos coloring:\n\n");
|
2086 |
|
|
|
2087 |
|
|
ira_traverse_loop_tree (false, ira_loop_tree_root, color_pass, NULL);
|
2088 |
|
|
|
2089 |
|
|
if (internal_flag_ira_verbose > 1 && ira_dump_file != NULL)
|
2090 |
|
|
ira_print_disposition (ira_dump_file);
|
2091 |
|
|
|
2092 |
|
|
free_alloc_pool (splay_tree_node_pool);
|
2093 |
|
|
ira_free_bitmap (coloring_allocno_bitmap);
|
2094 |
|
|
ira_free (allocnos_for_spilling);
|
2095 |
|
|
}
|
2096 |
|
|
|
2097 |
|
|
|
2098 |
|
|
|
2099 |
|
|
/* Move spill/restore code, which are to be generated in ira-emit.c,
|
2100 |
|
|
to less frequent points (if it is profitable) by reassigning some
|
2101 |
|
|
allocnos (in loop with subloops containing in another loop) to
|
2102 |
|
|
memory which results in longer live-range where the corresponding
|
2103 |
|
|
pseudo-registers will be in memory. */
|
2104 |
|
|
static void
|
2105 |
|
|
move_spill_restore (void)
|
2106 |
|
|
{
|
2107 |
|
|
int cost, regno, hard_regno, hard_regno2, index;
|
2108 |
|
|
bool changed_p;
|
2109 |
|
|
int enter_freq, exit_freq;
|
2110 |
|
|
enum machine_mode mode;
|
2111 |
|
|
enum reg_class rclass;
|
2112 |
|
|
ira_allocno_t a, parent_allocno, subloop_allocno;
|
2113 |
|
|
ira_loop_tree_node_t parent, loop_node, subloop_node;
|
2114 |
|
|
ira_allocno_iterator ai;
|
2115 |
|
|
|
2116 |
|
|
for (;;)
|
2117 |
|
|
{
|
2118 |
|
|
changed_p = false;
|
2119 |
|
|
if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL)
|
2120 |
|
|
fprintf (ira_dump_file, "New iteration of spill/restore move\n");
|
2121 |
|
|
FOR_EACH_ALLOCNO (a, ai)
|
2122 |
|
|
{
|
2123 |
|
|
regno = ALLOCNO_REGNO (a);
|
2124 |
|
|
loop_node = ALLOCNO_LOOP_TREE_NODE (a);
|
2125 |
|
|
if (ALLOCNO_CAP_MEMBER (a) != NULL
|
2126 |
|
|
|| ALLOCNO_CAP (a) != NULL
|
2127 |
|
|
|| (hard_regno = ALLOCNO_HARD_REGNO (a)) < 0
|
2128 |
|
|
|| loop_node->children == NULL
|
2129 |
|
|
/* don't do the optimization because it can create
|
2130 |
|
|
copies and the reload pass can spill the allocno set
|
2131 |
|
|
by copy although the allocno will not get memory
|
2132 |
|
|
slot. */
|
2133 |
|
|
|| ira_reg_equiv_invariant_p[regno]
|
2134 |
|
|
|| ira_reg_equiv_const[regno] != NULL_RTX
|
2135 |
|
|
|| !bitmap_bit_p (loop_node->border_allocnos, ALLOCNO_NUM (a)))
|
2136 |
|
|
continue;
|
2137 |
|
|
mode = ALLOCNO_MODE (a);
|
2138 |
|
|
rclass = ALLOCNO_COVER_CLASS (a);
|
2139 |
|
|
index = ira_class_hard_reg_index[rclass][hard_regno];
|
2140 |
|
|
ira_assert (index >= 0);
|
2141 |
|
|
cost = (ALLOCNO_MEMORY_COST (a)
|
2142 |
|
|
- (ALLOCNO_HARD_REG_COSTS (a) == NULL
|
2143 |
|
|
? ALLOCNO_COVER_CLASS_COST (a)
|
2144 |
|
|
: ALLOCNO_HARD_REG_COSTS (a)[index]));
|
2145 |
|
|
for (subloop_node = loop_node->subloops;
|
2146 |
|
|
subloop_node != NULL;
|
2147 |
|
|
subloop_node = subloop_node->subloop_next)
|
2148 |
|
|
{
|
2149 |
|
|
ira_assert (subloop_node->bb == NULL);
|
2150 |
|
|
subloop_allocno = subloop_node->regno_allocno_map[regno];
|
2151 |
|
|
if (subloop_allocno == NULL)
|
2152 |
|
|
continue;
|
2153 |
|
|
ira_assert (rclass == ALLOCNO_COVER_CLASS (subloop_allocno));
|
2154 |
|
|
/* We have accumulated cost. To get the real cost of
|
2155 |
|
|
allocno usage in the loop we should subtract costs of
|
2156 |
|
|
the subloop allocnos. */
|
2157 |
|
|
cost -= (ALLOCNO_MEMORY_COST (subloop_allocno)
|
2158 |
|
|
- (ALLOCNO_HARD_REG_COSTS (subloop_allocno) == NULL
|
2159 |
|
|
? ALLOCNO_COVER_CLASS_COST (subloop_allocno)
|
2160 |
|
|
: ALLOCNO_HARD_REG_COSTS (subloop_allocno)[index]));
|
2161 |
|
|
exit_freq = ira_loop_edge_freq (subloop_node, regno, true);
|
2162 |
|
|
enter_freq = ira_loop_edge_freq (subloop_node, regno, false);
|
2163 |
|
|
if ((hard_regno2 = ALLOCNO_HARD_REGNO (subloop_allocno)) < 0)
|
2164 |
|
|
cost -= (ira_memory_move_cost[mode][rclass][0] * exit_freq
|
2165 |
|
|
+ ira_memory_move_cost[mode][rclass][1] * enter_freq);
|
2166 |
|
|
else
|
2167 |
|
|
{
|
2168 |
|
|
cost
|
2169 |
|
|
+= (ira_memory_move_cost[mode][rclass][0] * exit_freq
|
2170 |
|
|
+ ira_memory_move_cost[mode][rclass][1] * enter_freq);
|
2171 |
|
|
if (hard_regno2 != hard_regno)
|
2172 |
|
|
cost -= (ira_get_register_move_cost (mode, rclass, rclass)
|
2173 |
|
|
* (exit_freq + enter_freq));
|
2174 |
|
|
}
|
2175 |
|
|
}
|
2176 |
|
|
if ((parent = loop_node->parent) != NULL
|
2177 |
|
|
&& (parent_allocno = parent->regno_allocno_map[regno]) != NULL)
|
2178 |
|
|
{
|
2179 |
|
|
ira_assert (rclass == ALLOCNO_COVER_CLASS (parent_allocno));
|
2180 |
|
|
exit_freq = ira_loop_edge_freq (loop_node, regno, true);
|
2181 |
|
|
enter_freq = ira_loop_edge_freq (loop_node, regno, false);
|
2182 |
|
|
if ((hard_regno2 = ALLOCNO_HARD_REGNO (parent_allocno)) < 0)
|
2183 |
|
|
cost -= (ira_memory_move_cost[mode][rclass][0] * exit_freq
|
2184 |
|
|
+ ira_memory_move_cost[mode][rclass][1] * enter_freq);
|
2185 |
|
|
else
|
2186 |
|
|
{
|
2187 |
|
|
cost
|
2188 |
|
|
+= (ira_memory_move_cost[mode][rclass][1] * exit_freq
|
2189 |
|
|
+ ira_memory_move_cost[mode][rclass][0] * enter_freq);
|
2190 |
|
|
if (hard_regno2 != hard_regno)
|
2191 |
|
|
cost -= (ira_get_register_move_cost (mode, rclass, rclass)
|
2192 |
|
|
* (exit_freq + enter_freq));
|
2193 |
|
|
}
|
2194 |
|
|
}
|
2195 |
|
|
if (cost < 0)
|
2196 |
|
|
{
|
2197 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
2198 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2199 |
|
|
{
|
2200 |
|
|
fprintf
|
2201 |
|
|
(ira_dump_file,
|
2202 |
|
|
" Moving spill/restore for a%dr%d up from loop %d",
|
2203 |
|
|
ALLOCNO_NUM (a), regno, loop_node->loop->num);
|
2204 |
|
|
fprintf (ira_dump_file, " - profit %d\n", -cost);
|
2205 |
|
|
}
|
2206 |
|
|
changed_p = true;
|
2207 |
|
|
}
|
2208 |
|
|
}
|
2209 |
|
|
if (! changed_p)
|
2210 |
|
|
break;
|
2211 |
|
|
}
|
2212 |
|
|
}
|
2213 |
|
|
|
2214 |
|
|
|
2215 |
|
|
|
2216 |
|
|
/* Update current hard reg costs and current conflict hard reg costs
|
2217 |
|
|
for allocno A. It is done by processing its copies containing
|
2218 |
|
|
other allocnos already assigned. */
|
2219 |
|
|
static void
|
2220 |
|
|
update_curr_costs (ira_allocno_t a)
|
2221 |
|
|
{
|
2222 |
|
|
int i, hard_regno, cost;
|
2223 |
|
|
enum machine_mode mode;
|
2224 |
|
|
enum reg_class cover_class, rclass;
|
2225 |
|
|
ira_allocno_t another_a;
|
2226 |
|
|
ira_copy_t cp, next_cp;
|
2227 |
|
|
|
2228 |
|
|
ira_assert (! ALLOCNO_ASSIGNED_P (a));
|
2229 |
|
|
cover_class = ALLOCNO_COVER_CLASS (a);
|
2230 |
|
|
if (cover_class == NO_REGS)
|
2231 |
|
|
return;
|
2232 |
|
|
mode = ALLOCNO_MODE (a);
|
2233 |
|
|
for (cp = ALLOCNO_COPIES (a); cp != NULL; cp = next_cp)
|
2234 |
|
|
{
|
2235 |
|
|
if (cp->first == a)
|
2236 |
|
|
{
|
2237 |
|
|
next_cp = cp->next_first_allocno_copy;
|
2238 |
|
|
another_a = cp->second;
|
2239 |
|
|
}
|
2240 |
|
|
else if (cp->second == a)
|
2241 |
|
|
{
|
2242 |
|
|
next_cp = cp->next_second_allocno_copy;
|
2243 |
|
|
another_a = cp->first;
|
2244 |
|
|
}
|
2245 |
|
|
else
|
2246 |
|
|
gcc_unreachable ();
|
2247 |
|
|
if (! ira_reg_classes_intersect_p[cover_class][ALLOCNO_COVER_CLASS
|
2248 |
|
|
(another_a)]
|
2249 |
|
|
|| ! ALLOCNO_ASSIGNED_P (another_a)
|
2250 |
|
|
|| (hard_regno = ALLOCNO_HARD_REGNO (another_a)) < 0)
|
2251 |
|
|
continue;
|
2252 |
|
|
rclass = REGNO_REG_CLASS (hard_regno);
|
2253 |
|
|
i = ira_class_hard_reg_index[cover_class][hard_regno];
|
2254 |
|
|
if (i < 0)
|
2255 |
|
|
continue;
|
2256 |
|
|
cost = (cp->first == a
|
2257 |
|
|
? ira_get_register_move_cost (mode, rclass, cover_class)
|
2258 |
|
|
: ira_get_register_move_cost (mode, cover_class, rclass));
|
2259 |
|
|
ira_allocate_and_set_or_copy_costs
|
2260 |
|
|
(&ALLOCNO_UPDATED_HARD_REG_COSTS (a),
|
2261 |
|
|
cover_class, ALLOCNO_COVER_CLASS_COST (a),
|
2262 |
|
|
ALLOCNO_HARD_REG_COSTS (a));
|
2263 |
|
|
ira_allocate_and_set_or_copy_costs
|
2264 |
|
|
(&ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a),
|
2265 |
|
|
cover_class, 0, ALLOCNO_CONFLICT_HARD_REG_COSTS (a));
|
2266 |
|
|
ALLOCNO_UPDATED_HARD_REG_COSTS (a)[i] -= cp->freq * cost;
|
2267 |
|
|
ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a)[i] -= cp->freq * cost;
|
2268 |
|
|
}
|
2269 |
|
|
}
|
2270 |
|
|
|
2271 |
|
|
/* Try to assign hard registers to the unassigned allocnos and
|
2272 |
|
|
allocnos conflicting with them or conflicting with allocnos whose
|
2273 |
|
|
regno >= START_REGNO. The function is called after ira_flattening,
|
2274 |
|
|
so more allocnos (including ones created in ira-emit.c) will have a
|
2275 |
|
|
chance to get a hard register. We use simple assignment algorithm
|
2276 |
|
|
based on priorities. */
|
2277 |
|
|
void
|
2278 |
|
|
ira_reassign_conflict_allocnos (int start_regno)
|
2279 |
|
|
{
|
2280 |
|
|
int i, allocnos_to_color_num;
|
2281 |
|
|
ira_allocno_t a, conflict_a;
|
2282 |
|
|
ira_allocno_conflict_iterator aci;
|
2283 |
|
|
enum reg_class cover_class;
|
2284 |
|
|
bitmap allocnos_to_color;
|
2285 |
|
|
ira_allocno_iterator ai;
|
2286 |
|
|
|
2287 |
|
|
allocnos_to_color = ira_allocate_bitmap ();
|
2288 |
|
|
allocnos_to_color_num = 0;
|
2289 |
|
|
FOR_EACH_ALLOCNO (a, ai)
|
2290 |
|
|
{
|
2291 |
|
|
if (! ALLOCNO_ASSIGNED_P (a)
|
2292 |
|
|
&& ! bitmap_bit_p (allocnos_to_color, ALLOCNO_NUM (a)))
|
2293 |
|
|
{
|
2294 |
|
|
if (ALLOCNO_COVER_CLASS (a) != NO_REGS)
|
2295 |
|
|
sorted_allocnos[allocnos_to_color_num++] = a;
|
2296 |
|
|
else
|
2297 |
|
|
{
|
2298 |
|
|
ALLOCNO_ASSIGNED_P (a) = true;
|
2299 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
2300 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (a) == NULL);
|
2301 |
|
|
ira_assert (ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a) == NULL);
|
2302 |
|
|
}
|
2303 |
|
|
bitmap_set_bit (allocnos_to_color, ALLOCNO_NUM (a));
|
2304 |
|
|
}
|
2305 |
|
|
if (ALLOCNO_REGNO (a) < start_regno
|
2306 |
|
|
|| (cover_class = ALLOCNO_COVER_CLASS (a)) == NO_REGS)
|
2307 |
|
|
continue;
|
2308 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_a, aci)
|
2309 |
|
|
{
|
2310 |
|
|
ira_assert (ira_reg_classes_intersect_p
|
2311 |
|
|
[cover_class][ALLOCNO_COVER_CLASS (conflict_a)]);
|
2312 |
|
|
if (bitmap_bit_p (allocnos_to_color, ALLOCNO_NUM (conflict_a)))
|
2313 |
|
|
continue;
|
2314 |
|
|
bitmap_set_bit (allocnos_to_color, ALLOCNO_NUM (conflict_a));
|
2315 |
|
|
sorted_allocnos[allocnos_to_color_num++] = conflict_a;
|
2316 |
|
|
}
|
2317 |
|
|
}
|
2318 |
|
|
ira_free_bitmap (allocnos_to_color);
|
2319 |
|
|
if (allocnos_to_color_num > 1)
|
2320 |
|
|
{
|
2321 |
|
|
setup_allocno_priorities (sorted_allocnos, allocnos_to_color_num);
|
2322 |
|
|
qsort (sorted_allocnos, allocnos_to_color_num, sizeof (ira_allocno_t),
|
2323 |
|
|
allocno_priority_compare_func);
|
2324 |
|
|
}
|
2325 |
|
|
for (i = 0; i < allocnos_to_color_num; i++)
|
2326 |
|
|
{
|
2327 |
|
|
a = sorted_allocnos[i];
|
2328 |
|
|
ALLOCNO_ASSIGNED_P (a) = false;
|
2329 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (a) == NULL);
|
2330 |
|
|
ira_assert (ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a) == NULL);
|
2331 |
|
|
update_curr_costs (a);
|
2332 |
|
|
}
|
2333 |
|
|
for (i = 0; i < allocnos_to_color_num; i++)
|
2334 |
|
|
{
|
2335 |
|
|
a = sorted_allocnos[i];
|
2336 |
|
|
if (assign_hard_reg (a, true))
|
2337 |
|
|
{
|
2338 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2339 |
|
|
fprintf
|
2340 |
|
|
(ira_dump_file,
|
2341 |
|
|
" Secondary allocation: assign hard reg %d to reg %d\n",
|
2342 |
|
|
ALLOCNO_HARD_REGNO (a), ALLOCNO_REGNO (a));
|
2343 |
|
|
}
|
2344 |
|
|
}
|
2345 |
|
|
}
|
2346 |
|
|
|
2347 |
|
|
|
2348 |
|
|
|
2349 |
|
|
/* This page contains code to coalesce memory stack slots used by
|
2350 |
|
|
spilled allocnos. This results in smaller stack frame, better data
|
2351 |
|
|
locality, and in smaller code for some architectures like
|
2352 |
|
|
x86/x86_64 where insn size depends on address displacement value.
|
2353 |
|
|
On the other hand, it can worsen insn scheduling after the RA but
|
2354 |
|
|
in practice it is less important than smaller stack frames. */
|
2355 |
|
|
|
2356 |
|
|
/* Usage cost and order number of coalesced allocno set to which
|
2357 |
|
|
given pseudo register belongs to. */
|
2358 |
|
|
static int *regno_coalesced_allocno_cost;
|
2359 |
|
|
static int *regno_coalesced_allocno_num;
|
2360 |
|
|
|
2361 |
|
|
/* Sort pseudos according frequencies of coalesced allocno sets they
|
2362 |
|
|
belong to (putting most frequently ones first), and according to
|
2363 |
|
|
coalesced allocno set order numbers. */
|
2364 |
|
|
static int
|
2365 |
|
|
coalesced_pseudo_reg_freq_compare (const void *v1p, const void *v2p)
|
2366 |
|
|
{
|
2367 |
|
|
const int regno1 = *(const int *) v1p;
|
2368 |
|
|
const int regno2 = *(const int *) v2p;
|
2369 |
|
|
int diff;
|
2370 |
|
|
|
2371 |
|
|
if ((diff = (regno_coalesced_allocno_cost[regno2]
|
2372 |
|
|
- regno_coalesced_allocno_cost[regno1])) != 0)
|
2373 |
|
|
return diff;
|
2374 |
|
|
if ((diff = (regno_coalesced_allocno_num[regno1]
|
2375 |
|
|
- regno_coalesced_allocno_num[regno2])) != 0)
|
2376 |
|
|
return diff;
|
2377 |
|
|
return regno1 - regno2;
|
2378 |
|
|
}
|
2379 |
|
|
|
2380 |
|
|
/* Widest width in which each pseudo reg is referred to (via subreg).
|
2381 |
|
|
It is used for sorting pseudo registers. */
|
2382 |
|
|
static unsigned int *regno_max_ref_width;
|
2383 |
|
|
|
2384 |
|
|
/* Redefine STACK_GROWS_DOWNWARD in terms of 0 or 1. */
|
2385 |
|
|
#ifdef STACK_GROWS_DOWNWARD
|
2386 |
|
|
# undef STACK_GROWS_DOWNWARD
|
2387 |
|
|
# define STACK_GROWS_DOWNWARD 1
|
2388 |
|
|
#else
|
2389 |
|
|
# define STACK_GROWS_DOWNWARD 0
|
2390 |
|
|
#endif
|
2391 |
|
|
|
2392 |
|
|
/* Sort pseudos according their slot numbers (putting ones with
|
2393 |
|
|
smaller numbers first, or last when the frame pointer is not
|
2394 |
|
|
needed). */
|
2395 |
|
|
static int
|
2396 |
|
|
coalesced_pseudo_reg_slot_compare (const void *v1p, const void *v2p)
|
2397 |
|
|
{
|
2398 |
|
|
const int regno1 = *(const int *) v1p;
|
2399 |
|
|
const int regno2 = *(const int *) v2p;
|
2400 |
|
|
ira_allocno_t a1 = ira_regno_allocno_map[regno1];
|
2401 |
|
|
ira_allocno_t a2 = ira_regno_allocno_map[regno2];
|
2402 |
|
|
int diff, slot_num1, slot_num2;
|
2403 |
|
|
int total_size1, total_size2;
|
2404 |
|
|
|
2405 |
|
|
if (a1 == NULL || ALLOCNO_HARD_REGNO (a1) >= 0)
|
2406 |
|
|
{
|
2407 |
|
|
if (a2 == NULL || ALLOCNO_HARD_REGNO (a2) >= 0)
|
2408 |
|
|
return regno1 - regno2;
|
2409 |
|
|
return 1;
|
2410 |
|
|
}
|
2411 |
|
|
else if (a2 == NULL || ALLOCNO_HARD_REGNO (a2) >= 0)
|
2412 |
|
|
return -1;
|
2413 |
|
|
slot_num1 = -ALLOCNO_HARD_REGNO (a1);
|
2414 |
|
|
slot_num2 = -ALLOCNO_HARD_REGNO (a2);
|
2415 |
|
|
if ((diff = slot_num1 - slot_num2) != 0)
|
2416 |
|
|
return (frame_pointer_needed
|
2417 |
|
|
|| !FRAME_GROWS_DOWNWARD == STACK_GROWS_DOWNWARD ? diff : -diff);
|
2418 |
|
|
total_size1 = MAX (PSEUDO_REGNO_BYTES (regno1), regno_max_ref_width[regno1]);
|
2419 |
|
|
total_size2 = MAX (PSEUDO_REGNO_BYTES (regno2), regno_max_ref_width[regno2]);
|
2420 |
|
|
if ((diff = total_size2 - total_size1) != 0)
|
2421 |
|
|
return diff;
|
2422 |
|
|
return regno1 - regno2;
|
2423 |
|
|
}
|
2424 |
|
|
|
2425 |
|
|
/* Setup REGNO_COALESCED_ALLOCNO_COST and REGNO_COALESCED_ALLOCNO_NUM
|
2426 |
|
|
for coalesced allocno sets containing allocnos with their regnos
|
2427 |
|
|
given in array PSEUDO_REGNOS of length N. */
|
2428 |
|
|
static void
|
2429 |
|
|
setup_coalesced_allocno_costs_and_nums (int *pseudo_regnos, int n)
|
2430 |
|
|
{
|
2431 |
|
|
int i, num, regno, cost;
|
2432 |
|
|
ira_allocno_t allocno, a;
|
2433 |
|
|
|
2434 |
|
|
for (num = i = 0; i < n; i++)
|
2435 |
|
|
{
|
2436 |
|
|
regno = pseudo_regnos[i];
|
2437 |
|
|
allocno = ira_regno_allocno_map[regno];
|
2438 |
|
|
if (allocno == NULL)
|
2439 |
|
|
{
|
2440 |
|
|
regno_coalesced_allocno_cost[regno] = 0;
|
2441 |
|
|
regno_coalesced_allocno_num[regno] = ++num;
|
2442 |
|
|
continue;
|
2443 |
|
|
}
|
2444 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) != allocno)
|
2445 |
|
|
continue;
|
2446 |
|
|
num++;
|
2447 |
|
|
for (cost = 0, a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
2448 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
2449 |
|
|
{
|
2450 |
|
|
cost += ALLOCNO_FREQ (a);
|
2451 |
|
|
if (a == allocno)
|
2452 |
|
|
break;
|
2453 |
|
|
}
|
2454 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
2455 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
2456 |
|
|
{
|
2457 |
|
|
regno_coalesced_allocno_num[ALLOCNO_REGNO (a)] = num;
|
2458 |
|
|
regno_coalesced_allocno_cost[ALLOCNO_REGNO (a)] = cost;
|
2459 |
|
|
if (a == allocno)
|
2460 |
|
|
break;
|
2461 |
|
|
}
|
2462 |
|
|
}
|
2463 |
|
|
}
|
2464 |
|
|
|
2465 |
|
|
/* Collect spilled allocnos representing coalesced allocno sets (the
|
2466 |
|
|
first coalesced allocno). The collected allocnos are returned
|
2467 |
|
|
through array SPILLED_COALESCED_ALLOCNOS. The function returns the
|
2468 |
|
|
number of the collected allocnos. The allocnos are given by their
|
2469 |
|
|
regnos in array PSEUDO_REGNOS of length N. */
|
2470 |
|
|
static int
|
2471 |
|
|
collect_spilled_coalesced_allocnos (int *pseudo_regnos, int n,
|
2472 |
|
|
ira_allocno_t *spilled_coalesced_allocnos)
|
2473 |
|
|
{
|
2474 |
|
|
int i, num, regno;
|
2475 |
|
|
ira_allocno_t allocno;
|
2476 |
|
|
|
2477 |
|
|
for (num = i = 0; i < n; i++)
|
2478 |
|
|
{
|
2479 |
|
|
regno = pseudo_regnos[i];
|
2480 |
|
|
allocno = ira_regno_allocno_map[regno];
|
2481 |
|
|
if (allocno == NULL || ALLOCNO_HARD_REGNO (allocno) >= 0
|
2482 |
|
|
|| ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) != allocno)
|
2483 |
|
|
continue;
|
2484 |
|
|
spilled_coalesced_allocnos[num++] = allocno;
|
2485 |
|
|
}
|
2486 |
|
|
return num;
|
2487 |
|
|
}
|
2488 |
|
|
|
2489 |
|
|
/* Array of live ranges of size IRA_ALLOCNOS_NUM. Live range for
|
2490 |
|
|
given slot contains live ranges of coalesced allocnos assigned to
|
2491 |
|
|
given slot. */
|
2492 |
|
|
static allocno_live_range_t *slot_coalesced_allocnos_live_ranges;
|
2493 |
|
|
|
2494 |
|
|
/* Return TRUE if coalesced allocnos represented by ALLOCNO has live
|
2495 |
|
|
ranges intersected with live ranges of coalesced allocnos assigned
|
2496 |
|
|
to slot with number N. */
|
2497 |
|
|
static bool
|
2498 |
|
|
slot_coalesced_allocno_live_ranges_intersect_p (ira_allocno_t allocno, int n)
|
2499 |
|
|
{
|
2500 |
|
|
ira_allocno_t a;
|
2501 |
|
|
|
2502 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
2503 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
2504 |
|
|
{
|
2505 |
|
|
if (ira_allocno_live_ranges_intersect_p
|
2506 |
|
|
(slot_coalesced_allocnos_live_ranges[n], ALLOCNO_LIVE_RANGES (a)))
|
2507 |
|
|
return true;
|
2508 |
|
|
if (a == allocno)
|
2509 |
|
|
break;
|
2510 |
|
|
}
|
2511 |
|
|
return false;
|
2512 |
|
|
}
|
2513 |
|
|
|
2514 |
|
|
/* Update live ranges of slot to which coalesced allocnos represented
|
2515 |
|
|
by ALLOCNO were assigned. */
|
2516 |
|
|
static void
|
2517 |
|
|
setup_slot_coalesced_allocno_live_ranges (ira_allocno_t allocno)
|
2518 |
|
|
{
|
2519 |
|
|
int n;
|
2520 |
|
|
ira_allocno_t a;
|
2521 |
|
|
allocno_live_range_t r;
|
2522 |
|
|
|
2523 |
|
|
n = ALLOCNO_TEMP (allocno);
|
2524 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
2525 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
2526 |
|
|
{
|
2527 |
|
|
r = ira_copy_allocno_live_range_list (ALLOCNO_LIVE_RANGES (a));
|
2528 |
|
|
slot_coalesced_allocnos_live_ranges[n]
|
2529 |
|
|
= ira_merge_allocno_live_ranges
|
2530 |
|
|
(slot_coalesced_allocnos_live_ranges[n], r);
|
2531 |
|
|
if (a == allocno)
|
2532 |
|
|
break;
|
2533 |
|
|
}
|
2534 |
|
|
}
|
2535 |
|
|
|
2536 |
|
|
/* We have coalesced allocnos involving in copies. Coalesce allocnos
|
2537 |
|
|
further in order to share the same memory stack slot. Allocnos
|
2538 |
|
|
representing sets of allocnos coalesced before the call are given
|
2539 |
|
|
in array SPILLED_COALESCED_ALLOCNOS of length NUM. Return TRUE if
|
2540 |
|
|
some allocnos were coalesced in the function. */
|
2541 |
|
|
static bool
|
2542 |
|
|
coalesce_spill_slots (ira_allocno_t *spilled_coalesced_allocnos, int num)
|
2543 |
|
|
{
|
2544 |
|
|
int i, j, n, last_coalesced_allocno_num;
|
2545 |
|
|
ira_allocno_t allocno, a;
|
2546 |
|
|
bool merged_p = false;
|
2547 |
|
|
bitmap set_jump_crosses = regstat_get_setjmp_crosses ();
|
2548 |
|
|
|
2549 |
|
|
slot_coalesced_allocnos_live_ranges
|
2550 |
|
|
= (allocno_live_range_t *) ira_allocate (sizeof (allocno_live_range_t)
|
2551 |
|
|
* ira_allocnos_num);
|
2552 |
|
|
memset (slot_coalesced_allocnos_live_ranges, 0,
|
2553 |
|
|
sizeof (allocno_live_range_t) * ira_allocnos_num);
|
2554 |
|
|
last_coalesced_allocno_num = 0;
|
2555 |
|
|
/* Coalesce non-conflicting spilled allocnos preferring most
|
2556 |
|
|
frequently used. */
|
2557 |
|
|
for (i = 0; i < num; i++)
|
2558 |
|
|
{
|
2559 |
|
|
allocno = spilled_coalesced_allocnos[i];
|
2560 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) != allocno
|
2561 |
|
|
|| bitmap_bit_p (set_jump_crosses, ALLOCNO_REGNO (allocno))
|
2562 |
|
|
|| (ALLOCNO_REGNO (allocno) < ira_reg_equiv_len
|
2563 |
|
|
&& (ira_reg_equiv_const[ALLOCNO_REGNO (allocno)] != NULL_RTX
|
2564 |
|
|
|| ira_reg_equiv_invariant_p[ALLOCNO_REGNO (allocno)])))
|
2565 |
|
|
continue;
|
2566 |
|
|
for (j = 0; j < i; j++)
|
2567 |
|
|
{
|
2568 |
|
|
a = spilled_coalesced_allocnos[j];
|
2569 |
|
|
n = ALLOCNO_TEMP (a);
|
2570 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (a) == a
|
2571 |
|
|
&& ! bitmap_bit_p (set_jump_crosses, ALLOCNO_REGNO (a))
|
2572 |
|
|
&& (ALLOCNO_REGNO (a) >= ira_reg_equiv_len
|
2573 |
|
|
|| (! ira_reg_equiv_invariant_p[ALLOCNO_REGNO (a)]
|
2574 |
|
|
&& ira_reg_equiv_const[ALLOCNO_REGNO (a)] == NULL_RTX))
|
2575 |
|
|
&& ! slot_coalesced_allocno_live_ranges_intersect_p (allocno, n))
|
2576 |
|
|
break;
|
2577 |
|
|
}
|
2578 |
|
|
if (j >= i)
|
2579 |
|
|
{
|
2580 |
|
|
/* No coalescing: set up number for coalesced allocnos
|
2581 |
|
|
represented by ALLOCNO. */
|
2582 |
|
|
ALLOCNO_TEMP (allocno) = last_coalesced_allocno_num++;
|
2583 |
|
|
setup_slot_coalesced_allocno_live_ranges (allocno);
|
2584 |
|
|
}
|
2585 |
|
|
else
|
2586 |
|
|
{
|
2587 |
|
|
allocno_coalesced_p = true;
|
2588 |
|
|
merged_p = true;
|
2589 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2590 |
|
|
fprintf (ira_dump_file,
|
2591 |
|
|
" Coalescing spilled allocnos a%dr%d->a%dr%d\n",
|
2592 |
|
|
ALLOCNO_NUM (allocno), ALLOCNO_REGNO (allocno),
|
2593 |
|
|
ALLOCNO_NUM (a), ALLOCNO_REGNO (a));
|
2594 |
|
|
ALLOCNO_TEMP (allocno) = ALLOCNO_TEMP (a);
|
2595 |
|
|
setup_slot_coalesced_allocno_live_ranges (allocno);
|
2596 |
|
|
merge_allocnos (a, allocno);
|
2597 |
|
|
ira_assert (ALLOCNO_FIRST_COALESCED_ALLOCNO (a) == a);
|
2598 |
|
|
}
|
2599 |
|
|
}
|
2600 |
|
|
for (i = 0; i < ira_allocnos_num; i++)
|
2601 |
|
|
ira_finish_allocno_live_range_list
|
2602 |
|
|
(slot_coalesced_allocnos_live_ranges[i]);
|
2603 |
|
|
ira_free (slot_coalesced_allocnos_live_ranges);
|
2604 |
|
|
return merged_p;
|
2605 |
|
|
}
|
2606 |
|
|
|
2607 |
|
|
/* Sort pseudo-register numbers in array PSEUDO_REGNOS of length N for
|
2608 |
|
|
subsequent assigning stack slots to them in the reload pass. To do
|
2609 |
|
|
this we coalesce spilled allocnos first to decrease the number of
|
2610 |
|
|
memory-memory move insns. This function is called by the
|
2611 |
|
|
reload. */
|
2612 |
|
|
void
|
2613 |
|
|
ira_sort_regnos_for_alter_reg (int *pseudo_regnos, int n,
|
2614 |
|
|
unsigned int *reg_max_ref_width)
|
2615 |
|
|
{
|
2616 |
|
|
int max_regno = max_reg_num ();
|
2617 |
|
|
int i, regno, num, slot_num;
|
2618 |
|
|
ira_allocno_t allocno, a;
|
2619 |
|
|
ira_allocno_iterator ai;
|
2620 |
|
|
ira_allocno_t *spilled_coalesced_allocnos;
|
2621 |
|
|
|
2622 |
|
|
processed_coalesced_allocno_bitmap = ira_allocate_bitmap ();
|
2623 |
|
|
/* Set up allocnos can be coalesced. */
|
2624 |
|
|
coloring_allocno_bitmap = ira_allocate_bitmap ();
|
2625 |
|
|
for (i = 0; i < n; i++)
|
2626 |
|
|
{
|
2627 |
|
|
regno = pseudo_regnos[i];
|
2628 |
|
|
allocno = ira_regno_allocno_map[regno];
|
2629 |
|
|
if (allocno != NULL)
|
2630 |
|
|
bitmap_set_bit (coloring_allocno_bitmap,
|
2631 |
|
|
ALLOCNO_NUM (allocno));
|
2632 |
|
|
}
|
2633 |
|
|
allocno_coalesced_p = false;
|
2634 |
|
|
coalesce_allocnos (true);
|
2635 |
|
|
ira_free_bitmap (coloring_allocno_bitmap);
|
2636 |
|
|
regno_coalesced_allocno_cost
|
2637 |
|
|
= (int *) ira_allocate (max_regno * sizeof (int));
|
2638 |
|
|
regno_coalesced_allocno_num
|
2639 |
|
|
= (int *) ira_allocate (max_regno * sizeof (int));
|
2640 |
|
|
memset (regno_coalesced_allocno_num, 0, max_regno * sizeof (int));
|
2641 |
|
|
setup_coalesced_allocno_costs_and_nums (pseudo_regnos, n);
|
2642 |
|
|
/* Sort regnos according frequencies of the corresponding coalesced
|
2643 |
|
|
allocno sets. */
|
2644 |
|
|
qsort (pseudo_regnos, n, sizeof (int), coalesced_pseudo_reg_freq_compare);
|
2645 |
|
|
spilled_coalesced_allocnos
|
2646 |
|
|
= (ira_allocno_t *) ira_allocate (ira_allocnos_num
|
2647 |
|
|
* sizeof (ira_allocno_t));
|
2648 |
|
|
/* Collect allocnos representing the spilled coalesced allocno
|
2649 |
|
|
sets. */
|
2650 |
|
|
num = collect_spilled_coalesced_allocnos (pseudo_regnos, n,
|
2651 |
|
|
spilled_coalesced_allocnos);
|
2652 |
|
|
if (flag_ira_share_spill_slots
|
2653 |
|
|
&& coalesce_spill_slots (spilled_coalesced_allocnos, num))
|
2654 |
|
|
{
|
2655 |
|
|
setup_coalesced_allocno_costs_and_nums (pseudo_regnos, n);
|
2656 |
|
|
qsort (pseudo_regnos, n, sizeof (int),
|
2657 |
|
|
coalesced_pseudo_reg_freq_compare);
|
2658 |
|
|
num = collect_spilled_coalesced_allocnos (pseudo_regnos, n,
|
2659 |
|
|
spilled_coalesced_allocnos);
|
2660 |
|
|
}
|
2661 |
|
|
ira_free_bitmap (processed_coalesced_allocno_bitmap);
|
2662 |
|
|
allocno_coalesced_p = false;
|
2663 |
|
|
/* Assign stack slot numbers to spilled allocno sets, use smaller
|
2664 |
|
|
numbers for most frequently used coalesced allocnos. -1 is
|
2665 |
|
|
reserved for dynamic search of stack slots for pseudos spilled by
|
2666 |
|
|
the reload. */
|
2667 |
|
|
slot_num = 1;
|
2668 |
|
|
for (i = 0; i < num; i++)
|
2669 |
|
|
{
|
2670 |
|
|
allocno = spilled_coalesced_allocnos[i];
|
2671 |
|
|
if (ALLOCNO_FIRST_COALESCED_ALLOCNO (allocno) != allocno
|
2672 |
|
|
|| ALLOCNO_HARD_REGNO (allocno) >= 0
|
2673 |
|
|
|| (ALLOCNO_REGNO (allocno) < ira_reg_equiv_len
|
2674 |
|
|
&& (ira_reg_equiv_const[ALLOCNO_REGNO (allocno)] != NULL_RTX
|
2675 |
|
|
|| ira_reg_equiv_invariant_p[ALLOCNO_REGNO (allocno)])))
|
2676 |
|
|
continue;
|
2677 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2678 |
|
|
fprintf (ira_dump_file, " Slot %d (freq,size):", slot_num);
|
2679 |
|
|
slot_num++;
|
2680 |
|
|
for (a = ALLOCNO_NEXT_COALESCED_ALLOCNO (allocno);;
|
2681 |
|
|
a = ALLOCNO_NEXT_COALESCED_ALLOCNO (a))
|
2682 |
|
|
{
|
2683 |
|
|
ira_assert (ALLOCNO_HARD_REGNO (a) < 0);
|
2684 |
|
|
ALLOCNO_HARD_REGNO (a) = -slot_num;
|
2685 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2686 |
|
|
fprintf (ira_dump_file, " a%dr%d(%d,%d)",
|
2687 |
|
|
ALLOCNO_NUM (a), ALLOCNO_REGNO (a), ALLOCNO_FREQ (a),
|
2688 |
|
|
MAX (PSEUDO_REGNO_BYTES (ALLOCNO_REGNO (a)),
|
2689 |
|
|
reg_max_ref_width[ALLOCNO_REGNO (a)]));
|
2690 |
|
|
|
2691 |
|
|
if (a == allocno)
|
2692 |
|
|
break;
|
2693 |
|
|
}
|
2694 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2695 |
|
|
fprintf (ira_dump_file, "\n");
|
2696 |
|
|
}
|
2697 |
|
|
ira_spilled_reg_stack_slots_num = slot_num - 1;
|
2698 |
|
|
ira_free (spilled_coalesced_allocnos);
|
2699 |
|
|
/* Sort regnos according the slot numbers. */
|
2700 |
|
|
regno_max_ref_width = reg_max_ref_width;
|
2701 |
|
|
qsort (pseudo_regnos, n, sizeof (int), coalesced_pseudo_reg_slot_compare);
|
2702 |
|
|
/* Uncoalesce allocnos which is necessary for (re)assigning during
|
2703 |
|
|
the reload pass. */
|
2704 |
|
|
FOR_EACH_ALLOCNO (a, ai)
|
2705 |
|
|
{
|
2706 |
|
|
ALLOCNO_FIRST_COALESCED_ALLOCNO (a) = a;
|
2707 |
|
|
ALLOCNO_NEXT_COALESCED_ALLOCNO (a) = a;
|
2708 |
|
|
}
|
2709 |
|
|
ira_free (regno_coalesced_allocno_num);
|
2710 |
|
|
ira_free (regno_coalesced_allocno_cost);
|
2711 |
|
|
}
|
2712 |
|
|
|
2713 |
|
|
|
2714 |
|
|
|
2715 |
|
|
/* This page contains code used by the reload pass to improve the
|
2716 |
|
|
final code. */
|
2717 |
|
|
|
2718 |
|
|
/* The function is called from reload to mark changes in the
|
2719 |
|
|
allocation of REGNO made by the reload. Remember that reg_renumber
|
2720 |
|
|
reflects the change result. */
|
2721 |
|
|
void
|
2722 |
|
|
ira_mark_allocation_change (int regno)
|
2723 |
|
|
{
|
2724 |
|
|
ira_allocno_t a = ira_regno_allocno_map[regno];
|
2725 |
|
|
int old_hard_regno, hard_regno, cost;
|
2726 |
|
|
enum reg_class cover_class = ALLOCNO_COVER_CLASS (a);
|
2727 |
|
|
|
2728 |
|
|
ira_assert (a != NULL);
|
2729 |
|
|
hard_regno = reg_renumber[regno];
|
2730 |
|
|
if ((old_hard_regno = ALLOCNO_HARD_REGNO (a)) == hard_regno)
|
2731 |
|
|
return;
|
2732 |
|
|
if (old_hard_regno < 0)
|
2733 |
|
|
cost = -ALLOCNO_MEMORY_COST (a);
|
2734 |
|
|
else
|
2735 |
|
|
{
|
2736 |
|
|
ira_assert (ira_class_hard_reg_index[cover_class][old_hard_regno] >= 0);
|
2737 |
|
|
cost = -(ALLOCNO_HARD_REG_COSTS (a) == NULL
|
2738 |
|
|
? ALLOCNO_COVER_CLASS_COST (a)
|
2739 |
|
|
: ALLOCNO_HARD_REG_COSTS (a)
|
2740 |
|
|
[ira_class_hard_reg_index[cover_class][old_hard_regno]]);
|
2741 |
|
|
update_copy_costs (a, false);
|
2742 |
|
|
}
|
2743 |
|
|
ira_overall_cost -= cost;
|
2744 |
|
|
ALLOCNO_HARD_REGNO (a) = hard_regno;
|
2745 |
|
|
if (hard_regno < 0)
|
2746 |
|
|
{
|
2747 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
2748 |
|
|
cost += ALLOCNO_MEMORY_COST (a);
|
2749 |
|
|
}
|
2750 |
|
|
else if (ira_class_hard_reg_index[cover_class][hard_regno] >= 0)
|
2751 |
|
|
{
|
2752 |
|
|
cost += (ALLOCNO_HARD_REG_COSTS (a) == NULL
|
2753 |
|
|
? ALLOCNO_COVER_CLASS_COST (a)
|
2754 |
|
|
: ALLOCNO_HARD_REG_COSTS (a)
|
2755 |
|
|
[ira_class_hard_reg_index[cover_class][hard_regno]]);
|
2756 |
|
|
update_copy_costs (a, true);
|
2757 |
|
|
}
|
2758 |
|
|
else
|
2759 |
|
|
/* Reload changed class of the allocno. */
|
2760 |
|
|
cost = 0;
|
2761 |
|
|
ira_overall_cost += cost;
|
2762 |
|
|
}
|
2763 |
|
|
|
2764 |
|
|
/* This function is called when reload deletes memory-memory move. In
|
2765 |
|
|
this case we marks that the allocation of the corresponding
|
2766 |
|
|
allocnos should be not changed in future. Otherwise we risk to get
|
2767 |
|
|
a wrong code. */
|
2768 |
|
|
void
|
2769 |
|
|
ira_mark_memory_move_deletion (int dst_regno, int src_regno)
|
2770 |
|
|
{
|
2771 |
|
|
ira_allocno_t dst = ira_regno_allocno_map[dst_regno];
|
2772 |
|
|
ira_allocno_t src = ira_regno_allocno_map[src_regno];
|
2773 |
|
|
|
2774 |
|
|
ira_assert (dst != NULL && src != NULL
|
2775 |
|
|
&& ALLOCNO_HARD_REGNO (dst) < 0
|
2776 |
|
|
&& ALLOCNO_HARD_REGNO (src) < 0);
|
2777 |
|
|
ALLOCNO_DONT_REASSIGN_P (dst) = true;
|
2778 |
|
|
ALLOCNO_DONT_REASSIGN_P (src) = true;
|
2779 |
|
|
}
|
2780 |
|
|
|
2781 |
|
|
/* Try to assign a hard register (except for FORBIDDEN_REGS) to
|
2782 |
|
|
allocno A and return TRUE in the case of success. */
|
2783 |
|
|
static bool
|
2784 |
|
|
allocno_reload_assign (ira_allocno_t a, HARD_REG_SET forbidden_regs)
|
2785 |
|
|
{
|
2786 |
|
|
int hard_regno;
|
2787 |
|
|
enum reg_class cover_class;
|
2788 |
|
|
int regno = ALLOCNO_REGNO (a);
|
2789 |
|
|
|
2790 |
|
|
IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), forbidden_regs);
|
2791 |
|
|
if (! flag_caller_saves && ALLOCNO_CALLS_CROSSED_NUM (a) != 0)
|
2792 |
|
|
IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), call_used_reg_set);
|
2793 |
|
|
ALLOCNO_ASSIGNED_P (a) = false;
|
2794 |
|
|
ira_assert (ALLOCNO_UPDATED_HARD_REG_COSTS (a) == NULL);
|
2795 |
|
|
ira_assert (ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS (a) == NULL);
|
2796 |
|
|
cover_class = ALLOCNO_COVER_CLASS (a);
|
2797 |
|
|
update_curr_costs (a);
|
2798 |
|
|
assign_hard_reg (a, true);
|
2799 |
|
|
hard_regno = ALLOCNO_HARD_REGNO (a);
|
2800 |
|
|
reg_renumber[regno] = hard_regno;
|
2801 |
|
|
if (hard_regno < 0)
|
2802 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
2803 |
|
|
else
|
2804 |
|
|
{
|
2805 |
|
|
ira_assert (ira_class_hard_reg_index[cover_class][hard_regno] >= 0);
|
2806 |
|
|
ira_overall_cost -= (ALLOCNO_MEMORY_COST (a)
|
2807 |
|
|
- (ALLOCNO_HARD_REG_COSTS (a) == NULL
|
2808 |
|
|
? ALLOCNO_COVER_CLASS_COST (a)
|
2809 |
|
|
: ALLOCNO_HARD_REG_COSTS (a)
|
2810 |
|
|
[ira_class_hard_reg_index
|
2811 |
|
|
[cover_class][hard_regno]]));
|
2812 |
|
|
if (ALLOCNO_CALLS_CROSSED_NUM (a) != 0
|
2813 |
|
|
&& ! ira_hard_reg_not_in_set_p (hard_regno, ALLOCNO_MODE (a),
|
2814 |
|
|
call_used_reg_set))
|
2815 |
|
|
{
|
2816 |
|
|
ira_assert (flag_caller_saves);
|
2817 |
|
|
caller_save_needed = 1;
|
2818 |
|
|
}
|
2819 |
|
|
}
|
2820 |
|
|
|
2821 |
|
|
/* If we found a hard register, modify the RTL for the pseudo
|
2822 |
|
|
register to show the hard register, and mark the pseudo register
|
2823 |
|
|
live. */
|
2824 |
|
|
if (reg_renumber[regno] >= 0)
|
2825 |
|
|
{
|
2826 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2827 |
|
|
fprintf (ira_dump_file, ": reassign to %d\n", reg_renumber[regno]);
|
2828 |
|
|
SET_REGNO (regno_reg_rtx[regno], reg_renumber[regno]);
|
2829 |
|
|
mark_home_live (regno);
|
2830 |
|
|
}
|
2831 |
|
|
else if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2832 |
|
|
fprintf (ira_dump_file, "\n");
|
2833 |
|
|
|
2834 |
|
|
return reg_renumber[regno] >= 0;
|
2835 |
|
|
}
|
2836 |
|
|
|
2837 |
|
|
/* Sort pseudos according their usage frequencies (putting most
|
2838 |
|
|
frequently ones first). */
|
2839 |
|
|
static int
|
2840 |
|
|
pseudo_reg_compare (const void *v1p, const void *v2p)
|
2841 |
|
|
{
|
2842 |
|
|
int regno1 = *(const int *) v1p;
|
2843 |
|
|
int regno2 = *(const int *) v2p;
|
2844 |
|
|
int diff;
|
2845 |
|
|
|
2846 |
|
|
if ((diff = REG_FREQ (regno2) - REG_FREQ (regno1)) != 0)
|
2847 |
|
|
return diff;
|
2848 |
|
|
return regno1 - regno2;
|
2849 |
|
|
}
|
2850 |
|
|
|
2851 |
|
|
/* Try to allocate hard registers to SPILLED_PSEUDO_REGS (there are
|
2852 |
|
|
NUM of them) or spilled pseudos conflicting with pseudos in
|
2853 |
|
|
SPILLED_PSEUDO_REGS. Return TRUE and update SPILLED, if the
|
2854 |
|
|
allocation has been changed. The function doesn't use
|
2855 |
|
|
BAD_SPILL_REGS and hard registers in PSEUDO_FORBIDDEN_REGS and
|
2856 |
|
|
PSEUDO_PREVIOUS_REGS for the corresponding pseudos. The function
|
2857 |
|
|
is called by the reload pass at the end of each reload
|
2858 |
|
|
iteration. */
|
2859 |
|
|
bool
|
2860 |
|
|
ira_reassign_pseudos (int *spilled_pseudo_regs, int num,
|
2861 |
|
|
HARD_REG_SET bad_spill_regs,
|
2862 |
|
|
HARD_REG_SET *pseudo_forbidden_regs,
|
2863 |
|
|
HARD_REG_SET *pseudo_previous_regs, bitmap spilled)
|
2864 |
|
|
{
|
2865 |
|
|
int i, m, n, regno;
|
2866 |
|
|
bool changed_p;
|
2867 |
|
|
ira_allocno_t a, conflict_a;
|
2868 |
|
|
HARD_REG_SET forbidden_regs;
|
2869 |
|
|
ira_allocno_conflict_iterator aci;
|
2870 |
|
|
|
2871 |
|
|
if (num > 1)
|
2872 |
|
|
qsort (spilled_pseudo_regs, num, sizeof (int), pseudo_reg_compare);
|
2873 |
|
|
changed_p = false;
|
2874 |
|
|
/* Try to assign hard registers to pseudos from
|
2875 |
|
|
SPILLED_PSEUDO_REGS. */
|
2876 |
|
|
for (m = i = 0; i < num; i++)
|
2877 |
|
|
{
|
2878 |
|
|
regno = spilled_pseudo_regs[i];
|
2879 |
|
|
COPY_HARD_REG_SET (forbidden_regs, bad_spill_regs);
|
2880 |
|
|
IOR_HARD_REG_SET (forbidden_regs, pseudo_forbidden_regs[regno]);
|
2881 |
|
|
IOR_HARD_REG_SET (forbidden_regs, pseudo_previous_regs[regno]);
|
2882 |
|
|
gcc_assert (reg_renumber[regno] < 0);
|
2883 |
|
|
a = ira_regno_allocno_map[regno];
|
2884 |
|
|
ira_mark_allocation_change (regno);
|
2885 |
|
|
ira_assert (reg_renumber[regno] < 0);
|
2886 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2887 |
|
|
fprintf (ira_dump_file,
|
2888 |
|
|
" Spill %d(a%d), cost=%d", regno, ALLOCNO_NUM (a),
|
2889 |
|
|
ALLOCNO_MEMORY_COST (a)
|
2890 |
|
|
- ALLOCNO_COVER_CLASS_COST (a));
|
2891 |
|
|
allocno_reload_assign (a, forbidden_regs);
|
2892 |
|
|
if (reg_renumber[regno] >= 0)
|
2893 |
|
|
{
|
2894 |
|
|
CLEAR_REGNO_REG_SET (spilled, regno);
|
2895 |
|
|
changed_p = true;
|
2896 |
|
|
}
|
2897 |
|
|
else
|
2898 |
|
|
spilled_pseudo_regs[m++] = regno;
|
2899 |
|
|
}
|
2900 |
|
|
if (m == 0)
|
2901 |
|
|
return changed_p;
|
2902 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2903 |
|
|
{
|
2904 |
|
|
fprintf (ira_dump_file, " Spilled regs");
|
2905 |
|
|
for (i = 0; i < m; i++)
|
2906 |
|
|
fprintf (ira_dump_file, " %d", spilled_pseudo_regs[i]);
|
2907 |
|
|
fprintf (ira_dump_file, "\n");
|
2908 |
|
|
}
|
2909 |
|
|
/* Try to assign hard registers to pseudos conflicting with ones
|
2910 |
|
|
from SPILLED_PSEUDO_REGS. */
|
2911 |
|
|
for (i = n = 0; i < m; i++)
|
2912 |
|
|
{
|
2913 |
|
|
regno = spilled_pseudo_regs[i];
|
2914 |
|
|
a = ira_regno_allocno_map[regno];
|
2915 |
|
|
FOR_EACH_ALLOCNO_CONFLICT (a, conflict_a, aci)
|
2916 |
|
|
if (ALLOCNO_HARD_REGNO (conflict_a) < 0
|
2917 |
|
|
&& ! ALLOCNO_DONT_REASSIGN_P (conflict_a)
|
2918 |
|
|
&& ! bitmap_bit_p (consideration_allocno_bitmap,
|
2919 |
|
|
ALLOCNO_NUM (conflict_a)))
|
2920 |
|
|
{
|
2921 |
|
|
sorted_allocnos[n++] = conflict_a;
|
2922 |
|
|
bitmap_set_bit (consideration_allocno_bitmap,
|
2923 |
|
|
ALLOCNO_NUM (conflict_a));
|
2924 |
|
|
}
|
2925 |
|
|
}
|
2926 |
|
|
if (n != 0)
|
2927 |
|
|
{
|
2928 |
|
|
setup_allocno_priorities (sorted_allocnos, n);
|
2929 |
|
|
qsort (sorted_allocnos, n, sizeof (ira_allocno_t),
|
2930 |
|
|
allocno_priority_compare_func);
|
2931 |
|
|
for (i = 0; i < n; i++)
|
2932 |
|
|
{
|
2933 |
|
|
a = sorted_allocnos[i];
|
2934 |
|
|
regno = ALLOCNO_REGNO (a);
|
2935 |
|
|
COPY_HARD_REG_SET (forbidden_regs, bad_spill_regs);
|
2936 |
|
|
IOR_HARD_REG_SET (forbidden_regs, pseudo_forbidden_regs[regno]);
|
2937 |
|
|
IOR_HARD_REG_SET (forbidden_regs, pseudo_previous_regs[regno]);
|
2938 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file != NULL)
|
2939 |
|
|
fprintf (ira_dump_file,
|
2940 |
|
|
" Try assign %d(a%d), cost=%d",
|
2941 |
|
|
regno, ALLOCNO_NUM (a),
|
2942 |
|
|
ALLOCNO_MEMORY_COST (a)
|
2943 |
|
|
- ALLOCNO_COVER_CLASS_COST (a));
|
2944 |
|
|
if (allocno_reload_assign (a, forbidden_regs))
|
2945 |
|
|
{
|
2946 |
|
|
changed_p = true;
|
2947 |
|
|
bitmap_clear_bit (spilled, regno);
|
2948 |
|
|
}
|
2949 |
|
|
}
|
2950 |
|
|
}
|
2951 |
|
|
return changed_p;
|
2952 |
|
|
}
|
2953 |
|
|
|
2954 |
|
|
/* The function is called by reload and returns already allocated
|
2955 |
|
|
stack slot (if any) for REGNO with given INHERENT_SIZE and
|
2956 |
|
|
TOTAL_SIZE. In the case of failure to find a slot which can be
|
2957 |
|
|
used for REGNO, the function returns NULL. */
|
2958 |
|
|
rtx
|
2959 |
|
|
ira_reuse_stack_slot (int regno, unsigned int inherent_size,
|
2960 |
|
|
unsigned int total_size)
|
2961 |
|
|
{
|
2962 |
|
|
unsigned int i;
|
2963 |
|
|
int slot_num, best_slot_num;
|
2964 |
|
|
int cost, best_cost;
|
2965 |
|
|
ira_copy_t cp, next_cp;
|
2966 |
|
|
ira_allocno_t another_allocno, allocno = ira_regno_allocno_map[regno];
|
2967 |
|
|
rtx x;
|
2968 |
|
|
bitmap_iterator bi;
|
2969 |
|
|
struct ira_spilled_reg_stack_slot *slot = NULL;
|
2970 |
|
|
|
2971 |
|
|
ira_assert (inherent_size == PSEUDO_REGNO_BYTES (regno)
|
2972 |
|
|
&& inherent_size <= total_size
|
2973 |
|
|
&& ALLOCNO_HARD_REGNO (allocno) < 0);
|
2974 |
|
|
if (! flag_ira_share_spill_slots)
|
2975 |
|
|
return NULL_RTX;
|
2976 |
|
|
slot_num = -ALLOCNO_HARD_REGNO (allocno) - 2;
|
2977 |
|
|
if (slot_num != -1)
|
2978 |
|
|
{
|
2979 |
|
|
slot = &ira_spilled_reg_stack_slots[slot_num];
|
2980 |
|
|
x = slot->mem;
|
2981 |
|
|
}
|
2982 |
|
|
else
|
2983 |
|
|
{
|
2984 |
|
|
best_cost = best_slot_num = -1;
|
2985 |
|
|
x = NULL_RTX;
|
2986 |
|
|
/* It means that the pseudo was spilled in the reload pass, try
|
2987 |
|
|
to reuse a slot. */
|
2988 |
|
|
for (slot_num = 0;
|
2989 |
|
|
slot_num < ira_spilled_reg_stack_slots_num;
|
2990 |
|
|
slot_num++)
|
2991 |
|
|
{
|
2992 |
|
|
slot = &ira_spilled_reg_stack_slots[slot_num];
|
2993 |
|
|
if (slot->mem == NULL_RTX)
|
2994 |
|
|
continue;
|
2995 |
|
|
if (slot->width < total_size
|
2996 |
|
|
|| GET_MODE_SIZE (GET_MODE (slot->mem)) < inherent_size)
|
2997 |
|
|
continue;
|
2998 |
|
|
|
2999 |
|
|
EXECUTE_IF_SET_IN_BITMAP (&slot->spilled_regs,
|
3000 |
|
|
FIRST_PSEUDO_REGISTER, i, bi)
|
3001 |
|
|
{
|
3002 |
|
|
another_allocno = ira_regno_allocno_map[i];
|
3003 |
|
|
if (allocnos_have_intersected_live_ranges_p (allocno,
|
3004 |
|
|
another_allocno))
|
3005 |
|
|
goto cont;
|
3006 |
|
|
}
|
3007 |
|
|
for (cost = 0, cp = ALLOCNO_COPIES (allocno);
|
3008 |
|
|
cp != NULL;
|
3009 |
|
|
cp = next_cp)
|
3010 |
|
|
{
|
3011 |
|
|
if (cp->first == allocno)
|
3012 |
|
|
{
|
3013 |
|
|
next_cp = cp->next_first_allocno_copy;
|
3014 |
|
|
another_allocno = cp->second;
|
3015 |
|
|
}
|
3016 |
|
|
else if (cp->second == allocno)
|
3017 |
|
|
{
|
3018 |
|
|
next_cp = cp->next_second_allocno_copy;
|
3019 |
|
|
another_allocno = cp->first;
|
3020 |
|
|
}
|
3021 |
|
|
else
|
3022 |
|
|
gcc_unreachable ();
|
3023 |
|
|
if (cp->insn == NULL_RTX)
|
3024 |
|
|
continue;
|
3025 |
|
|
if (bitmap_bit_p (&slot->spilled_regs,
|
3026 |
|
|
ALLOCNO_REGNO (another_allocno)))
|
3027 |
|
|
cost += cp->freq;
|
3028 |
|
|
}
|
3029 |
|
|
if (cost > best_cost)
|
3030 |
|
|
{
|
3031 |
|
|
best_cost = cost;
|
3032 |
|
|
best_slot_num = slot_num;
|
3033 |
|
|
}
|
3034 |
|
|
cont:
|
3035 |
|
|
;
|
3036 |
|
|
}
|
3037 |
|
|
if (best_cost >= 0)
|
3038 |
|
|
{
|
3039 |
|
|
slot_num = best_slot_num;
|
3040 |
|
|
slot = &ira_spilled_reg_stack_slots[slot_num];
|
3041 |
|
|
SET_REGNO_REG_SET (&slot->spilled_regs, regno);
|
3042 |
|
|
x = slot->mem;
|
3043 |
|
|
ALLOCNO_HARD_REGNO (allocno) = -slot_num - 2;
|
3044 |
|
|
}
|
3045 |
|
|
}
|
3046 |
|
|
if (x != NULL_RTX)
|
3047 |
|
|
{
|
3048 |
|
|
ira_assert (slot->width >= total_size);
|
3049 |
|
|
#ifdef ENABLE_IRA_CHECKING
|
3050 |
|
|
EXECUTE_IF_SET_IN_BITMAP (&slot->spilled_regs,
|
3051 |
|
|
FIRST_PSEUDO_REGISTER, i, bi)
|
3052 |
|
|
{
|
3053 |
|
|
ira_assert (! pseudos_have_intersected_live_ranges_p (regno, i));
|
3054 |
|
|
}
|
3055 |
|
|
#endif
|
3056 |
|
|
SET_REGNO_REG_SET (&slot->spilled_regs, regno);
|
3057 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file)
|
3058 |
|
|
{
|
3059 |
|
|
fprintf (ira_dump_file, " Assigning %d(freq=%d) slot %d of",
|
3060 |
|
|
regno, REG_FREQ (regno), slot_num);
|
3061 |
|
|
EXECUTE_IF_SET_IN_BITMAP (&slot->spilled_regs,
|
3062 |
|
|
FIRST_PSEUDO_REGISTER, i, bi)
|
3063 |
|
|
{
|
3064 |
|
|
if ((unsigned) regno != i)
|
3065 |
|
|
fprintf (ira_dump_file, " %d", i);
|
3066 |
|
|
}
|
3067 |
|
|
fprintf (ira_dump_file, "\n");
|
3068 |
|
|
}
|
3069 |
|
|
}
|
3070 |
|
|
return x;
|
3071 |
|
|
}
|
3072 |
|
|
|
3073 |
|
|
/* This is called by reload every time a new stack slot X with
|
3074 |
|
|
TOTAL_SIZE was allocated for REGNO. We store this info for
|
3075 |
|
|
subsequent ira_reuse_stack_slot calls. */
|
3076 |
|
|
void
|
3077 |
|
|
ira_mark_new_stack_slot (rtx x, int regno, unsigned int total_size)
|
3078 |
|
|
{
|
3079 |
|
|
struct ira_spilled_reg_stack_slot *slot;
|
3080 |
|
|
int slot_num;
|
3081 |
|
|
ira_allocno_t allocno;
|
3082 |
|
|
|
3083 |
|
|
ira_assert (PSEUDO_REGNO_BYTES (regno) <= total_size);
|
3084 |
|
|
allocno = ira_regno_allocno_map[regno];
|
3085 |
|
|
slot_num = -ALLOCNO_HARD_REGNO (allocno) - 2;
|
3086 |
|
|
if (slot_num == -1)
|
3087 |
|
|
{
|
3088 |
|
|
slot_num = ira_spilled_reg_stack_slots_num++;
|
3089 |
|
|
ALLOCNO_HARD_REGNO (allocno) = -slot_num - 2;
|
3090 |
|
|
}
|
3091 |
|
|
slot = &ira_spilled_reg_stack_slots[slot_num];
|
3092 |
|
|
INIT_REG_SET (&slot->spilled_regs);
|
3093 |
|
|
SET_REGNO_REG_SET (&slot->spilled_regs, regno);
|
3094 |
|
|
slot->mem = x;
|
3095 |
|
|
slot->width = total_size;
|
3096 |
|
|
if (internal_flag_ira_verbose > 3 && ira_dump_file)
|
3097 |
|
|
fprintf (ira_dump_file, " Assigning %d(freq=%d) a new slot %d\n",
|
3098 |
|
|
regno, REG_FREQ (regno), slot_num);
|
3099 |
|
|
}
|
3100 |
|
|
|
3101 |
|
|
|
3102 |
|
|
/* Return spill cost for pseudo-registers whose numbers are in array
|
3103 |
|
|
REGNOS (with a negative number as an end marker) for reload with
|
3104 |
|
|
given IN and OUT for INSN. Return also number points (through
|
3105 |
|
|
EXCESS_PRESSURE_LIVE_LENGTH) where the pseudo-register lives and
|
3106 |
|
|
the register pressure is high, number of references of the
|
3107 |
|
|
pseudo-registers (through NREFS), number of callee-clobbered
|
3108 |
|
|
hard-registers occupied by the pseudo-registers (through
|
3109 |
|
|
CALL_USED_COUNT), and the first hard regno occupied by the
|
3110 |
|
|
pseudo-registers (through FIRST_HARD_REGNO). */
|
3111 |
|
|
static int
|
3112 |
|
|
calculate_spill_cost (int *regnos, rtx in, rtx out, rtx insn,
|
3113 |
|
|
int *excess_pressure_live_length,
|
3114 |
|
|
int *nrefs, int *call_used_count, int *first_hard_regno)
|
3115 |
|
|
{
|
3116 |
|
|
int i, cost, regno, hard_regno, j, count, saved_cost, nregs;
|
3117 |
|
|
bool in_p, out_p;
|
3118 |
|
|
int length;
|
3119 |
|
|
ira_allocno_t a;
|
3120 |
|
|
|
3121 |
|
|
*nrefs = 0;
|
3122 |
|
|
for (length = count = cost = i = 0;; i++)
|
3123 |
|
|
{
|
3124 |
|
|
regno = regnos[i];
|
3125 |
|
|
if (regno < 0)
|
3126 |
|
|
break;
|
3127 |
|
|
*nrefs += REG_N_REFS (regno);
|
3128 |
|
|
hard_regno = reg_renumber[regno];
|
3129 |
|
|
ira_assert (hard_regno >= 0);
|
3130 |
|
|
a = ira_regno_allocno_map[regno];
|
3131 |
|
|
length += ALLOCNO_EXCESS_PRESSURE_POINTS_NUM (a);
|
3132 |
|
|
cost += ALLOCNO_MEMORY_COST (a) - ALLOCNO_COVER_CLASS_COST (a);
|
3133 |
|
|
nregs = hard_regno_nregs[hard_regno][ALLOCNO_MODE (a)];
|
3134 |
|
|
for (j = 0; j < nregs; j++)
|
3135 |
|
|
if (! TEST_HARD_REG_BIT (call_used_reg_set, hard_regno + j))
|
3136 |
|
|
break;
|
3137 |
|
|
if (j == nregs)
|
3138 |
|
|
count++;
|
3139 |
|
|
in_p = in && REG_P (in) && (int) REGNO (in) == hard_regno;
|
3140 |
|
|
out_p = out && REG_P (out) && (int) REGNO (out) == hard_regno;
|
3141 |
|
|
if ((in_p || out_p)
|
3142 |
|
|
&& find_regno_note (insn, REG_DEAD, hard_regno) != NULL_RTX)
|
3143 |
|
|
{
|
3144 |
|
|
saved_cost = 0;
|
3145 |
|
|
if (in_p)
|
3146 |
|
|
saved_cost += ira_memory_move_cost
|
3147 |
|
|
[ALLOCNO_MODE (a)][ALLOCNO_COVER_CLASS (a)][1];
|
3148 |
|
|
if (out_p)
|
3149 |
|
|
saved_cost
|
3150 |
|
|
+= ira_memory_move_cost
|
3151 |
|
|
[ALLOCNO_MODE (a)][ALLOCNO_COVER_CLASS (a)][0];
|
3152 |
|
|
cost -= REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn)) * saved_cost;
|
3153 |
|
|
}
|
3154 |
|
|
}
|
3155 |
|
|
*excess_pressure_live_length = length;
|
3156 |
|
|
*call_used_count = count;
|
3157 |
|
|
hard_regno = -1;
|
3158 |
|
|
if (regnos[0] >= 0)
|
3159 |
|
|
{
|
3160 |
|
|
hard_regno = reg_renumber[regnos[0]];
|
3161 |
|
|
}
|
3162 |
|
|
*first_hard_regno = hard_regno;
|
3163 |
|
|
return cost;
|
3164 |
|
|
}
|
3165 |
|
|
|
3166 |
|
|
/* Return TRUE if spilling pseudo-registers whose numbers are in array
|
3167 |
|
|
REGNOS is better than spilling pseudo-registers with numbers in
|
3168 |
|
|
OTHER_REGNOS for reload with given IN and OUT for INSN. The
|
3169 |
|
|
function used by the reload pass to make better register spilling
|
3170 |
|
|
decisions. */
|
3171 |
|
|
bool
|
3172 |
|
|
ira_better_spill_reload_regno_p (int *regnos, int *other_regnos,
|
3173 |
|
|
rtx in, rtx out, rtx insn)
|
3174 |
|
|
{
|
3175 |
|
|
int cost, other_cost;
|
3176 |
|
|
int length, other_length;
|
3177 |
|
|
int nrefs, other_nrefs;
|
3178 |
|
|
int call_used_count, other_call_used_count;
|
3179 |
|
|
int hard_regno, other_hard_regno;
|
3180 |
|
|
|
3181 |
|
|
cost = calculate_spill_cost (regnos, in, out, insn,
|
3182 |
|
|
&length, &nrefs, &call_used_count, &hard_regno);
|
3183 |
|
|
other_cost = calculate_spill_cost (other_regnos, in, out, insn,
|
3184 |
|
|
&other_length, &other_nrefs,
|
3185 |
|
|
&other_call_used_count,
|
3186 |
|
|
&other_hard_regno);
|
3187 |
|
|
if (nrefs == 0 && other_nrefs != 0)
|
3188 |
|
|
return true;
|
3189 |
|
|
if (nrefs != 0 && other_nrefs == 0)
|
3190 |
|
|
return false;
|
3191 |
|
|
if (cost != other_cost)
|
3192 |
|
|
return cost < other_cost;
|
3193 |
|
|
if (length != other_length)
|
3194 |
|
|
return length > other_length;
|
3195 |
|
|
#ifdef REG_ALLOC_ORDER
|
3196 |
|
|
if (hard_regno >= 0 && other_hard_regno >= 0)
|
3197 |
|
|
return (inv_reg_alloc_order[hard_regno]
|
3198 |
|
|
< inv_reg_alloc_order[other_hard_regno]);
|
3199 |
|
|
#else
|
3200 |
|
|
if (call_used_count != other_call_used_count)
|
3201 |
|
|
return call_used_count > other_call_used_count;
|
3202 |
|
|
#endif
|
3203 |
|
|
return false;
|
3204 |
|
|
}
|
3205 |
|
|
|
3206 |
|
|
|
3207 |
|
|
|
3208 |
|
|
/* Allocate and initialize data necessary for assign_hard_reg. */
|
3209 |
|
|
void
|
3210 |
|
|
ira_initiate_assign (void)
|
3211 |
|
|
{
|
3212 |
|
|
sorted_allocnos
|
3213 |
|
|
= (ira_allocno_t *) ira_allocate (sizeof (ira_allocno_t)
|
3214 |
|
|
* ira_allocnos_num);
|
3215 |
|
|
consideration_allocno_bitmap = ira_allocate_bitmap ();
|
3216 |
|
|
initiate_cost_update ();
|
3217 |
|
|
allocno_priorities = (int *) ira_allocate (sizeof (int) * ira_allocnos_num);
|
3218 |
|
|
}
|
3219 |
|
|
|
3220 |
|
|
/* Deallocate data used by assign_hard_reg. */
|
3221 |
|
|
void
|
3222 |
|
|
ira_finish_assign (void)
|
3223 |
|
|
{
|
3224 |
|
|
ira_free (sorted_allocnos);
|
3225 |
|
|
ira_free_bitmap (consideration_allocno_bitmap);
|
3226 |
|
|
finish_cost_update ();
|
3227 |
|
|
ira_free (allocno_priorities);
|
3228 |
|
|
}
|
3229 |
|
|
|
3230 |
|
|
|
3231 |
|
|
|
3232 |
|
|
/* Entry function doing color-based register allocation. */
|
3233 |
|
|
static void
|
3234 |
|
|
color (void)
|
3235 |
|
|
{
|
3236 |
|
|
allocno_stack_vec = VEC_alloc (ira_allocno_t, heap, ira_allocnos_num);
|
3237 |
|
|
removed_splay_allocno_vec
|
3238 |
|
|
= VEC_alloc (ira_allocno_t, heap, ira_allocnos_num);
|
3239 |
|
|
memset (allocated_hardreg_p, 0, sizeof (allocated_hardreg_p));
|
3240 |
|
|
ira_initiate_assign ();
|
3241 |
|
|
do_coloring ();
|
3242 |
|
|
ira_finish_assign ();
|
3243 |
|
|
VEC_free (ira_allocno_t, heap, removed_splay_allocno_vec);
|
3244 |
|
|
VEC_free (ira_allocno_t, heap, allocno_stack_vec);
|
3245 |
|
|
move_spill_restore ();
|
3246 |
|
|
}
|
3247 |
|
|
|
3248 |
|
|
|
3249 |
|
|
|
3250 |
|
|
/* This page contains a simple register allocator without usage of
|
3251 |
|
|
allocno conflicts. This is used for fast allocation for -O0. */
|
3252 |
|
|
|
3253 |
|
|
/* Do register allocation by not using allocno conflicts. It uses
|
3254 |
|
|
only allocno live ranges. The algorithm is close to Chow's
|
3255 |
|
|
priority coloring. */
|
3256 |
|
|
static void
|
3257 |
|
|
fast_allocation (void)
|
3258 |
|
|
{
|
3259 |
|
|
int i, j, k, num, class_size, hard_regno;
|
3260 |
|
|
#ifdef STACK_REGS
|
3261 |
|
|
bool no_stack_reg_p;
|
3262 |
|
|
#endif
|
3263 |
|
|
enum reg_class cover_class;
|
3264 |
|
|
enum machine_mode mode;
|
3265 |
|
|
ira_allocno_t a;
|
3266 |
|
|
ira_allocno_iterator ai;
|
3267 |
|
|
allocno_live_range_t r;
|
3268 |
|
|
HARD_REG_SET conflict_hard_regs, *used_hard_regs;
|
3269 |
|
|
|
3270 |
|
|
sorted_allocnos = (ira_allocno_t *) ira_allocate (sizeof (ira_allocno_t)
|
3271 |
|
|
* ira_allocnos_num);
|
3272 |
|
|
num = 0;
|
3273 |
|
|
FOR_EACH_ALLOCNO (a, ai)
|
3274 |
|
|
sorted_allocnos[num++] = a;
|
3275 |
|
|
allocno_priorities = (int *) ira_allocate (sizeof (int) * ira_allocnos_num);
|
3276 |
|
|
setup_allocno_priorities (sorted_allocnos, num);
|
3277 |
|
|
used_hard_regs = (HARD_REG_SET *) ira_allocate (sizeof (HARD_REG_SET)
|
3278 |
|
|
* ira_max_point);
|
3279 |
|
|
for (i = 0; i < ira_max_point; i++)
|
3280 |
|
|
CLEAR_HARD_REG_SET (used_hard_regs[i]);
|
3281 |
|
|
qsort (sorted_allocnos, num, sizeof (ira_allocno_t),
|
3282 |
|
|
allocno_priority_compare_func);
|
3283 |
|
|
for (i = 0; i < num; i++)
|
3284 |
|
|
{
|
3285 |
|
|
a = sorted_allocnos[i];
|
3286 |
|
|
COPY_HARD_REG_SET (conflict_hard_regs, ALLOCNO_CONFLICT_HARD_REGS (a));
|
3287 |
|
|
for (r = ALLOCNO_LIVE_RANGES (a); r != NULL; r = r->next)
|
3288 |
|
|
for (j = r->start; j <= r->finish; j++)
|
3289 |
|
|
IOR_HARD_REG_SET (conflict_hard_regs, used_hard_regs[j]);
|
3290 |
|
|
cover_class = ALLOCNO_COVER_CLASS (a);
|
3291 |
|
|
ALLOCNO_ASSIGNED_P (a) = true;
|
3292 |
|
|
ALLOCNO_HARD_REGNO (a) = -1;
|
3293 |
|
|
if (hard_reg_set_subset_p (reg_class_contents[cover_class],
|
3294 |
|
|
conflict_hard_regs))
|
3295 |
|
|
continue;
|
3296 |
|
|
mode = ALLOCNO_MODE (a);
|
3297 |
|
|
#ifdef STACK_REGS
|
3298 |
|
|
no_stack_reg_p = ALLOCNO_NO_STACK_REG_P (a);
|
3299 |
|
|
#endif
|
3300 |
|
|
class_size = ira_class_hard_regs_num[cover_class];
|
3301 |
|
|
for (j = 0; j < class_size; j++)
|
3302 |
|
|
{
|
3303 |
|
|
hard_regno = ira_class_hard_regs[cover_class][j];
|
3304 |
|
|
#ifdef STACK_REGS
|
3305 |
|
|
if (no_stack_reg_p && FIRST_STACK_REG <= hard_regno
|
3306 |
|
|
&& hard_regno <= LAST_STACK_REG)
|
3307 |
|
|
continue;
|
3308 |
|
|
#endif
|
3309 |
|
|
if (!ira_hard_reg_not_in_set_p (hard_regno, mode, conflict_hard_regs)
|
3310 |
|
|
|| (TEST_HARD_REG_BIT
|
3311 |
|
|
(prohibited_class_mode_regs[cover_class][mode], hard_regno)))
|
3312 |
|
|
continue;
|
3313 |
|
|
ALLOCNO_HARD_REGNO (a) = hard_regno;
|
3314 |
|
|
for (r = ALLOCNO_LIVE_RANGES (a); r != NULL; r = r->next)
|
3315 |
|
|
for (k = r->start; k <= r->finish; k++)
|
3316 |
|
|
IOR_HARD_REG_SET (used_hard_regs[k],
|
3317 |
|
|
ira_reg_mode_hard_regset[hard_regno][mode]);
|
3318 |
|
|
break;
|
3319 |
|
|
}
|
3320 |
|
|
}
|
3321 |
|
|
ira_free (sorted_allocnos);
|
3322 |
|
|
ira_free (used_hard_regs);
|
3323 |
|
|
ira_free (allocno_priorities);
|
3324 |
|
|
if (internal_flag_ira_verbose > 1 && ira_dump_file != NULL)
|
3325 |
|
|
ira_print_disposition (ira_dump_file);
|
3326 |
|
|
}
|
3327 |
|
|
|
3328 |
|
|
|
3329 |
|
|
|
3330 |
|
|
/* Entry function doing coloring. */
|
3331 |
|
|
void
|
3332 |
|
|
ira_color (void)
|
3333 |
|
|
{
|
3334 |
|
|
ira_allocno_t a;
|
3335 |
|
|
ira_allocno_iterator ai;
|
3336 |
|
|
|
3337 |
|
|
/* Setup updated costs. */
|
3338 |
|
|
FOR_EACH_ALLOCNO (a, ai)
|
3339 |
|
|
{
|
3340 |
|
|
ALLOCNO_UPDATED_MEMORY_COST (a) = ALLOCNO_MEMORY_COST (a);
|
3341 |
|
|
ALLOCNO_UPDATED_COVER_CLASS_COST (a) = ALLOCNO_COVER_CLASS_COST (a);
|
3342 |
|
|
}
|
3343 |
|
|
if (ira_conflicts_p)
|
3344 |
|
|
color ();
|
3345 |
|
|
else
|
3346 |
|
|
fast_allocation ();
|
3347 |
|
|
}
|