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fac41238 | 1 | /* Copy propagation on hard registers for the GNU compiler. |
5624e564 | 2 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
fac41238 PB |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
c7131fb2 | 23 | #include "backend.h" |
fac41238 | 24 | #include "rtl.h" |
c7131fb2 | 25 | #include "df.h" |
fac41238 PB |
26 | #include "tm_p.h" |
27 | #include "insn-config.h" | |
28 | #include "regs.h" | |
29 | #include "addresses.h" | |
60393bbc | 30 | #include "reload.h" |
fac41238 PB |
31 | #include "recog.h" |
32 | #include "flags.h" | |
718f9c0f | 33 | #include "diagnostic-core.h" |
fac41238 | 34 | #include "tree-pass.h" |
4ca738b3 | 35 | #include "rtl-iter.h" |
2bb8cb58 | 36 | #include "emit-rtl.h" |
fac41238 PB |
37 | |
38 | /* The following code does forward propagation of hard register copies. | |
39 | The object is to eliminate as many dependencies as possible, so that | |
40 | we have the most scheduling freedom. As a side effect, we also clean | |
41 | up some silly register allocation decisions made by reload. This | |
42 | code may be obsoleted by a new register allocator. */ | |
43 | ||
e7140c8d JJ |
44 | /* DEBUG_INSNs aren't changed right away, as doing so might extend the |
45 | lifetime of a register and get the DEBUG_INSN subsequently reset. | |
46 | So they are queued instead, and updated only when the register is | |
47 | used in some subsequent real insn before it is set. */ | |
48 | struct queued_debug_insn_change | |
49 | { | |
50 | struct queued_debug_insn_change *next; | |
ea8175a4 | 51 | rtx_insn *insn; |
e7140c8d JJ |
52 | rtx *loc; |
53 | rtx new_rtx; | |
54 | }; | |
55 | ||
fac41238 PB |
56 | /* For each register, we have a list of registers that contain the same |
57 | value. The OLDEST_REGNO field points to the head of the list, and | |
58 | the NEXT_REGNO field runs through the list. The MODE field indicates | |
59 | what mode the data is known to be in; this field is VOIDmode when the | |
60 | register is not known to contain valid data. */ | |
61 | ||
62 | struct value_data_entry | |
63 | { | |
ef4bddc2 | 64 | machine_mode mode; |
fac41238 PB |
65 | unsigned int oldest_regno; |
66 | unsigned int next_regno; | |
e7140c8d | 67 | struct queued_debug_insn_change *debug_insn_changes; |
fac41238 PB |
68 | }; |
69 | ||
70 | struct value_data | |
71 | { | |
72 | struct value_data_entry e[FIRST_PSEUDO_REGISTER]; | |
73 | unsigned int max_value_regs; | |
e7140c8d | 74 | unsigned int n_debug_insn_changes; |
fac41238 PB |
75 | }; |
76 | ||
fb0b2914 | 77 | static object_allocator<queued_debug_insn_change> queued_debug_insn_change_pool |
fcb87c50 | 78 | ("debug insn changes pool"); |
5c7337c5 | 79 | |
a2e6c10c | 80 | static bool skip_debug_insn_p; |
e7140c8d | 81 | |
fac41238 PB |
82 | static void kill_value_one_regno (unsigned, struct value_data *); |
83 | static void kill_value_regno (unsigned, unsigned, struct value_data *); | |
4ca738b3 | 84 | static void kill_value (const_rtx, struct value_data *); |
ef4bddc2 | 85 | static void set_value_regno (unsigned, machine_mode, struct value_data *); |
fac41238 PB |
86 | static void init_value_data (struct value_data *); |
87 | static void kill_clobbered_value (rtx, const_rtx, void *); | |
88 | static void kill_set_value (rtx, const_rtx, void *); | |
fac41238 | 89 | static void copy_value (rtx, rtx, struct value_data *); |
ef4bddc2 | 90 | static bool mode_change_ok (machine_mode, machine_mode, |
fac41238 | 91 | unsigned int); |
ef4bddc2 RS |
92 | static rtx maybe_mode_change (machine_mode, machine_mode, |
93 | machine_mode, unsigned int, unsigned int); | |
fac41238 | 94 | static rtx find_oldest_value_reg (enum reg_class, rtx, struct value_data *); |
ea8175a4 | 95 | static bool replace_oldest_value_reg (rtx *, enum reg_class, rtx_insn *, |
fac41238 PB |
96 | struct value_data *); |
97 | static bool replace_oldest_value_addr (rtx *, enum reg_class, | |
ef4bddc2 | 98 | machine_mode, addr_space_t, |
ea8175a4 DM |
99 | rtx_insn *, struct value_data *); |
100 | static bool replace_oldest_value_mem (rtx, rtx_insn *, struct value_data *); | |
fac41238 PB |
101 | static bool copyprop_hardreg_forward_1 (basic_block, struct value_data *); |
102 | extern void debug_value_data (struct value_data *); | |
fac41238 | 103 | static void validate_value_data (struct value_data *); |
fac41238 | 104 | |
e7140c8d JJ |
105 | /* Free all queued updates for DEBUG_INSNs that change some reg to |
106 | register REGNO. */ | |
107 | ||
108 | static void | |
109 | free_debug_insn_changes (struct value_data *vd, unsigned int regno) | |
110 | { | |
111 | struct queued_debug_insn_change *cur, *next; | |
112 | for (cur = vd->e[regno].debug_insn_changes; cur; cur = next) | |
113 | { | |
114 | next = cur->next; | |
115 | --vd->n_debug_insn_changes; | |
fb0b2914 | 116 | queued_debug_insn_change_pool.remove (cur); |
e7140c8d JJ |
117 | } |
118 | vd->e[regno].debug_insn_changes = NULL; | |
119 | } | |
120 | ||
fac41238 PB |
121 | /* Kill register REGNO. This involves removing it from any value |
122 | lists, and resetting the value mode to VOIDmode. This is only a | |
123 | helper function; it does not handle any hard registers overlapping | |
124 | with REGNO. */ | |
125 | ||
126 | static void | |
127 | kill_value_one_regno (unsigned int regno, struct value_data *vd) | |
128 | { | |
129 | unsigned int i, next; | |
130 | ||
131 | if (vd->e[regno].oldest_regno != regno) | |
132 | { | |
133 | for (i = vd->e[regno].oldest_regno; | |
134 | vd->e[i].next_regno != regno; | |
135 | i = vd->e[i].next_regno) | |
136 | continue; | |
137 | vd->e[i].next_regno = vd->e[regno].next_regno; | |
138 | } | |
139 | else if ((next = vd->e[regno].next_regno) != INVALID_REGNUM) | |
140 | { | |
141 | for (i = next; i != INVALID_REGNUM; i = vd->e[i].next_regno) | |
142 | vd->e[i].oldest_regno = next; | |
143 | } | |
144 | ||
145 | vd->e[regno].mode = VOIDmode; | |
146 | vd->e[regno].oldest_regno = regno; | |
147 | vd->e[regno].next_regno = INVALID_REGNUM; | |
e7140c8d JJ |
148 | if (vd->e[regno].debug_insn_changes) |
149 | free_debug_insn_changes (vd, regno); | |
fac41238 | 150 | |
b2b29377 MM |
151 | if (flag_checking) |
152 | validate_value_data (vd); | |
fac41238 PB |
153 | } |
154 | ||
155 | /* Kill the value in register REGNO for NREGS, and any other registers | |
156 | whose values overlap. */ | |
157 | ||
158 | static void | |
159 | kill_value_regno (unsigned int regno, unsigned int nregs, | |
160 | struct value_data *vd) | |
161 | { | |
162 | unsigned int j; | |
163 | ||
164 | /* Kill the value we're told to kill. */ | |
165 | for (j = 0; j < nregs; ++j) | |
166 | kill_value_one_regno (regno + j, vd); | |
167 | ||
168 | /* Kill everything that overlapped what we're told to kill. */ | |
169 | if (regno < vd->max_value_regs) | |
170 | j = 0; | |
171 | else | |
172 | j = regno - vd->max_value_regs; | |
173 | for (; j < regno; ++j) | |
174 | { | |
175 | unsigned int i, n; | |
176 | if (vd->e[j].mode == VOIDmode) | |
177 | continue; | |
178 | n = hard_regno_nregs[j][vd->e[j].mode]; | |
179 | if (j + n > regno) | |
180 | for (i = 0; i < n; ++i) | |
181 | kill_value_one_regno (j + i, vd); | |
182 | } | |
183 | } | |
184 | ||
185 | /* Kill X. This is a convenience function wrapping kill_value_regno | |
186 | so that we mind the mode the register is in. */ | |
187 | ||
188 | static void | |
4ca738b3 | 189 | kill_value (const_rtx x, struct value_data *vd) |
fac41238 | 190 | { |
fac41238 PB |
191 | if (GET_CODE (x) == SUBREG) |
192 | { | |
4ca738b3 RS |
193 | rtx tmp = simplify_subreg (GET_MODE (x), SUBREG_REG (x), |
194 | GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x)); | |
195 | x = tmp ? tmp : SUBREG_REG (x); | |
fac41238 PB |
196 | } |
197 | if (REG_P (x)) | |
dc8afb70 | 198 | kill_value_regno (REGNO (x), REG_NREGS (x), vd); |
fac41238 PB |
199 | } |
200 | ||
201 | /* Remember that REGNO is valid in MODE. */ | |
202 | ||
203 | static void | |
ef4bddc2 | 204 | set_value_regno (unsigned int regno, machine_mode mode, |
fac41238 PB |
205 | struct value_data *vd) |
206 | { | |
207 | unsigned int nregs; | |
208 | ||
209 | vd->e[regno].mode = mode; | |
210 | ||
211 | nregs = hard_regno_nregs[regno][mode]; | |
212 | if (nregs > vd->max_value_regs) | |
213 | vd->max_value_regs = nregs; | |
214 | } | |
215 | ||
216 | /* Initialize VD such that there are no known relationships between regs. */ | |
217 | ||
218 | static void | |
219 | init_value_data (struct value_data *vd) | |
220 | { | |
221 | int i; | |
222 | for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) | |
223 | { | |
224 | vd->e[i].mode = VOIDmode; | |
225 | vd->e[i].oldest_regno = i; | |
226 | vd->e[i].next_regno = INVALID_REGNUM; | |
e7140c8d | 227 | vd->e[i].debug_insn_changes = NULL; |
fac41238 PB |
228 | } |
229 | vd->max_value_regs = 0; | |
e7140c8d | 230 | vd->n_debug_insn_changes = 0; |
fac41238 PB |
231 | } |
232 | ||
233 | /* Called through note_stores. If X is clobbered, kill its value. */ | |
234 | ||
235 | static void | |
236 | kill_clobbered_value (rtx x, const_rtx set, void *data) | |
237 | { | |
238 | struct value_data *const vd = (struct value_data *) data; | |
239 | if (GET_CODE (set) == CLOBBER) | |
240 | kill_value (x, vd); | |
241 | } | |
242 | ||
e384e6b5 BS |
243 | /* A structure passed as data to kill_set_value through note_stores. */ |
244 | struct kill_set_value_data | |
245 | { | |
246 | struct value_data *vd; | |
247 | rtx ignore_set_reg; | |
248 | }; | |
249 | ||
fac41238 PB |
250 | /* Called through note_stores. If X is set, not clobbered, kill its |
251 | current value and install it as the root of its own value list. */ | |
252 | ||
253 | static void | |
254 | kill_set_value (rtx x, const_rtx set, void *data) | |
255 | { | |
e384e6b5 BS |
256 | struct kill_set_value_data *ksvd = (struct kill_set_value_data *) data; |
257 | if (rtx_equal_p (x, ksvd->ignore_set_reg)) | |
258 | return; | |
fac41238 PB |
259 | if (GET_CODE (set) != CLOBBER) |
260 | { | |
e384e6b5 | 261 | kill_value (x, ksvd->vd); |
fac41238 | 262 | if (REG_P (x)) |
e384e6b5 | 263 | set_value_regno (REGNO (x), GET_MODE (x), ksvd->vd); |
fac41238 PB |
264 | } |
265 | } | |
266 | ||
4ca738b3 RS |
267 | /* Kill any register used in X as the base of an auto-increment expression, |
268 | and install that register as the root of its own value list. */ | |
fac41238 | 269 | |
4ca738b3 | 270 | static void |
15cd50fb | 271 | kill_autoinc_value (rtx_insn *insn, struct value_data *vd) |
fac41238 | 272 | { |
4ca738b3 RS |
273 | subrtx_iterator::array_type array; |
274 | FOR_EACH_SUBRTX (iter, array, PATTERN (insn), NONCONST) | |
fac41238 | 275 | { |
4ca738b3 RS |
276 | const_rtx x = *iter; |
277 | if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC) | |
278 | { | |
279 | x = XEXP (x, 0); | |
280 | kill_value (x, vd); | |
281 | set_value_regno (REGNO (x), GET_MODE (x), vd); | |
282 | iter.skip_subrtxes (); | |
283 | } | |
fac41238 | 284 | } |
fac41238 PB |
285 | } |
286 | ||
287 | /* Assert that SRC has been copied to DEST. Adjust the data structures | |
288 | to reflect that SRC contains an older copy of the shared value. */ | |
289 | ||
290 | static void | |
291 | copy_value (rtx dest, rtx src, struct value_data *vd) | |
292 | { | |
293 | unsigned int dr = REGNO (dest); | |
294 | unsigned int sr = REGNO (src); | |
295 | unsigned int dn, sn; | |
296 | unsigned int i; | |
297 | ||
298 | /* ??? At present, it's possible to see noop sets. It'd be nice if | |
299 | this were cleaned up beforehand... */ | |
300 | if (sr == dr) | |
301 | return; | |
302 | ||
303 | /* Do not propagate copies to the stack pointer, as that can leave | |
304 | memory accesses with no scheduling dependency on the stack update. */ | |
305 | if (dr == STACK_POINTER_REGNUM) | |
306 | return; | |
307 | ||
308 | /* Likewise with the frame pointer, if we're using one. */ | |
309 | if (frame_pointer_needed && dr == HARD_FRAME_POINTER_REGNUM) | |
310 | return; | |
311 | ||
312 | /* Do not propagate copies to fixed or global registers, patterns | |
313 | can be relying to see particular fixed register or users can | |
314 | expect the chosen global register in asm. */ | |
315 | if (fixed_regs[dr] || global_regs[dr]) | |
316 | return; | |
317 | ||
318 | /* If SRC and DEST overlap, don't record anything. */ | |
dc8afb70 RS |
319 | dn = REG_NREGS (dest); |
320 | sn = REG_NREGS (src); | |
fac41238 PB |
321 | if ((dr > sr && dr < sr + sn) |
322 | || (sr > dr && sr < dr + dn)) | |
323 | return; | |
324 | ||
325 | /* If SRC had no assigned mode (i.e. we didn't know it was live) | |
326 | assign it now and assume the value came from an input argument | |
327 | or somesuch. */ | |
328 | if (vd->e[sr].mode == VOIDmode) | |
329 | set_value_regno (sr, vd->e[dr].mode, vd); | |
330 | ||
331 | /* If we are narrowing the input to a smaller number of hard regs, | |
332 | and it is in big endian, we are really extracting a high part. | |
333 | Since we generally associate a low part of a value with the value itself, | |
334 | we must not do the same for the high part. | |
335 | Note we can still get low parts for the same mode combination through | |
336 | a two-step copy involving differently sized hard regs. | |
026c3cfd | 337 | Assume hard regs fr* are 32 bits each, while r* are 64 bits each: |
fac41238 PB |
338 | (set (reg:DI r0) (reg:DI fr0)) |
339 | (set (reg:SI fr2) (reg:SI r0)) | |
340 | loads the low part of (reg:DI fr0) - i.e. fr1 - into fr2, while: | |
341 | (set (reg:SI fr2) (reg:SI fr0)) | |
342 | loads the high part of (reg:DI fr0) into fr2. | |
343 | ||
344 | We can't properly represent the latter case in our tables, so don't | |
345 | record anything then. */ | |
346 | else if (sn < (unsigned int) hard_regno_nregs[sr][vd->e[sr].mode] | |
347 | && (GET_MODE_SIZE (vd->e[sr].mode) > UNITS_PER_WORD | |
348 | ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) | |
349 | return; | |
350 | ||
351 | /* If SRC had been assigned a mode narrower than the copy, we can't | |
352 | link DEST into the chain, because not all of the pieces of the | |
353 | copy came from oldest_regno. */ | |
354 | else if (sn > (unsigned int) hard_regno_nregs[sr][vd->e[sr].mode]) | |
355 | return; | |
356 | ||
357 | /* Link DR at the end of the value chain used by SR. */ | |
358 | ||
359 | vd->e[dr].oldest_regno = vd->e[sr].oldest_regno; | |
360 | ||
361 | for (i = sr; vd->e[i].next_regno != INVALID_REGNUM; i = vd->e[i].next_regno) | |
362 | continue; | |
363 | vd->e[i].next_regno = dr; | |
364 | ||
b2b29377 MM |
365 | if (flag_checking) |
366 | validate_value_data (vd); | |
fac41238 PB |
367 | } |
368 | ||
369 | /* Return true if a mode change from ORIG to NEW is allowed for REGNO. */ | |
370 | ||
371 | static bool | |
ef4bddc2 | 372 | mode_change_ok (machine_mode orig_mode, machine_mode new_mode, |
fac41238 PB |
373 | unsigned int regno ATTRIBUTE_UNUSED) |
374 | { | |
375 | if (GET_MODE_SIZE (orig_mode) < GET_MODE_SIZE (new_mode)) | |
376 | return false; | |
377 | ||
378 | #ifdef CANNOT_CHANGE_MODE_CLASS | |
379 | return !REG_CANNOT_CHANGE_MODE_P (regno, orig_mode, new_mode); | |
380 | #endif | |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
385 | /* Register REGNO was originally set in ORIG_MODE. It - or a copy of it - | |
386 | was copied in COPY_MODE to COPY_REGNO, and then COPY_REGNO was accessed | |
387 | in NEW_MODE. | |
388 | Return a NEW_MODE rtx for REGNO if that's OK, otherwise return NULL_RTX. */ | |
389 | ||
390 | static rtx | |
ef4bddc2 RS |
391 | maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode, |
392 | machine_mode new_mode, unsigned int regno, | |
fac41238 PB |
393 | unsigned int copy_regno ATTRIBUTE_UNUSED) |
394 | { | |
395 | if (GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (orig_mode) | |
396 | && GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (new_mode)) | |
397 | return NULL_RTX; | |
398 | ||
399 | if (orig_mode == new_mode) | |
9fccb335 | 400 | return gen_raw_REG (new_mode, regno); |
fac41238 PB |
401 | else if (mode_change_ok (orig_mode, new_mode, regno)) |
402 | { | |
403 | int copy_nregs = hard_regno_nregs[copy_regno][copy_mode]; | |
404 | int use_nregs = hard_regno_nregs[copy_regno][new_mode]; | |
405 | int copy_offset | |
406 | = GET_MODE_SIZE (copy_mode) / copy_nregs * (copy_nregs - use_nregs); | |
407 | int offset | |
408 | = GET_MODE_SIZE (orig_mode) - GET_MODE_SIZE (new_mode) - copy_offset; | |
409 | int byteoffset = offset % UNITS_PER_WORD; | |
410 | int wordoffset = offset - byteoffset; | |
411 | ||
412 | offset = ((WORDS_BIG_ENDIAN ? wordoffset : 0) | |
413 | + (BYTES_BIG_ENDIAN ? byteoffset : 0)); | |
d6f23738 RS |
414 | regno += subreg_regno_offset (regno, orig_mode, offset, new_mode); |
415 | if (HARD_REGNO_MODE_OK (regno, new_mode)) | |
9fccb335 | 416 | return gen_raw_REG (new_mode, regno); |
fac41238 PB |
417 | } |
418 | return NULL_RTX; | |
419 | } | |
420 | ||
421 | /* Find the oldest copy of the value contained in REGNO that is in | |
422 | register class CL and has mode MODE. If found, return an rtx | |
423 | of that oldest register, otherwise return NULL. */ | |
424 | ||
425 | static rtx | |
426 | find_oldest_value_reg (enum reg_class cl, rtx reg, struct value_data *vd) | |
427 | { | |
428 | unsigned int regno = REGNO (reg); | |
ef4bddc2 | 429 | machine_mode mode = GET_MODE (reg); |
fac41238 PB |
430 | unsigned int i; |
431 | ||
432 | /* If we are accessing REG in some mode other that what we set it in, | |
433 | make sure that the replacement is valid. In particular, consider | |
434 | (set (reg:DI r11) (...)) | |
435 | (set (reg:SI r9) (reg:SI r11)) | |
436 | (set (reg:SI r10) (...)) | |
437 | (set (...) (reg:DI r9)) | |
438 | Replacing r9 with r11 is invalid. */ | |
439 | if (mode != vd->e[regno].mode) | |
440 | { | |
441 | if (hard_regno_nregs[regno][mode] | |
442 | > hard_regno_nregs[regno][vd->e[regno].mode]) | |
443 | return NULL_RTX; | |
444 | } | |
445 | ||
446 | for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno) | |
447 | { | |
ef4bddc2 | 448 | machine_mode oldmode = vd->e[i].mode; |
fac41238 PB |
449 | rtx new_rtx; |
450 | ||
451 | if (!in_hard_reg_set_p (reg_class_contents[cl], mode, i)) | |
f90333eb | 452 | continue; |
fac41238 PB |
453 | |
454 | new_rtx = maybe_mode_change (oldmode, vd->e[regno].mode, mode, i, regno); | |
455 | if (new_rtx) | |
456 | { | |
457 | ORIGINAL_REGNO (new_rtx) = ORIGINAL_REGNO (reg); | |
458 | REG_ATTRS (new_rtx) = REG_ATTRS (reg); | |
459 | REG_POINTER (new_rtx) = REG_POINTER (reg); | |
460 | return new_rtx; | |
461 | } | |
462 | } | |
463 | ||
464 | return NULL_RTX; | |
465 | } | |
466 | ||
467 | /* If possible, replace the register at *LOC with the oldest register | |
468 | in register class CL. Return true if successfully replaced. */ | |
469 | ||
470 | static bool | |
ea8175a4 | 471 | replace_oldest_value_reg (rtx *loc, enum reg_class cl, rtx_insn *insn, |
fac41238 PB |
472 | struct value_data *vd) |
473 | { | |
474 | rtx new_rtx = find_oldest_value_reg (cl, *loc, vd); | |
a2e6c10c | 475 | if (new_rtx && (!DEBUG_INSN_P (insn) || !skip_debug_insn_p)) |
fac41238 | 476 | { |
e7140c8d JJ |
477 | if (DEBUG_INSN_P (insn)) |
478 | { | |
479 | struct queued_debug_insn_change *change; | |
480 | ||
481 | if (dump_file) | |
482 | fprintf (dump_file, "debug_insn %u: queued replacing reg %u with %u\n", | |
483 | INSN_UID (insn), REGNO (*loc), REGNO (new_rtx)); | |
484 | ||
fb0b2914 | 485 | change = queued_debug_insn_change_pool.allocate (); |
e7140c8d JJ |
486 | change->next = vd->e[REGNO (new_rtx)].debug_insn_changes; |
487 | change->insn = insn; | |
488 | change->loc = loc; | |
489 | change->new_rtx = new_rtx; | |
490 | vd->e[REGNO (new_rtx)].debug_insn_changes = change; | |
491 | ++vd->n_debug_insn_changes; | |
492 | return true; | |
493 | } | |
fac41238 PB |
494 | if (dump_file) |
495 | fprintf (dump_file, "insn %u: replaced reg %u with %u\n", | |
496 | INSN_UID (insn), REGNO (*loc), REGNO (new_rtx)); | |
497 | ||
498 | validate_change (insn, loc, new_rtx, 1); | |
499 | return true; | |
500 | } | |
501 | return false; | |
502 | } | |
503 | ||
504 | /* Similar to replace_oldest_value_reg, but *LOC contains an address. | |
505 | Adapted from find_reloads_address_1. CL is INDEX_REG_CLASS or | |
506 | BASE_REG_CLASS depending on how the register is being considered. */ | |
507 | ||
508 | static bool | |
509 | replace_oldest_value_addr (rtx *loc, enum reg_class cl, | |
ef4bddc2 | 510 | machine_mode mode, addr_space_t as, |
ea8175a4 | 511 | rtx_insn *insn, struct value_data *vd) |
fac41238 PB |
512 | { |
513 | rtx x = *loc; | |
514 | RTX_CODE code = GET_CODE (x); | |
515 | const char *fmt; | |
516 | int i, j; | |
517 | bool changed = false; | |
518 | ||
519 | switch (code) | |
520 | { | |
521 | case PLUS: | |
b5b8b0ac AO |
522 | if (DEBUG_INSN_P (insn)) |
523 | break; | |
524 | ||
fac41238 PB |
525 | { |
526 | rtx orig_op0 = XEXP (x, 0); | |
527 | rtx orig_op1 = XEXP (x, 1); | |
528 | RTX_CODE code0 = GET_CODE (orig_op0); | |
529 | RTX_CODE code1 = GET_CODE (orig_op1); | |
530 | rtx op0 = orig_op0; | |
531 | rtx op1 = orig_op1; | |
532 | rtx *locI = NULL; | |
533 | rtx *locB = NULL; | |
534 | enum rtx_code index_code = SCRATCH; | |
535 | ||
536 | if (GET_CODE (op0) == SUBREG) | |
537 | { | |
538 | op0 = SUBREG_REG (op0); | |
539 | code0 = GET_CODE (op0); | |
540 | } | |
541 | ||
542 | if (GET_CODE (op1) == SUBREG) | |
543 | { | |
544 | op1 = SUBREG_REG (op1); | |
545 | code1 = GET_CODE (op1); | |
546 | } | |
547 | ||
548 | if (code0 == MULT || code0 == SIGN_EXTEND || code0 == TRUNCATE | |
549 | || code0 == ZERO_EXTEND || code1 == MEM) | |
550 | { | |
551 | locI = &XEXP (x, 0); | |
552 | locB = &XEXP (x, 1); | |
553 | index_code = GET_CODE (*locI); | |
554 | } | |
555 | else if (code1 == MULT || code1 == SIGN_EXTEND || code1 == TRUNCATE | |
556 | || code1 == ZERO_EXTEND || code0 == MEM) | |
557 | { | |
558 | locI = &XEXP (x, 1); | |
559 | locB = &XEXP (x, 0); | |
560 | index_code = GET_CODE (*locI); | |
561 | } | |
562 | else if (code0 == CONST_INT || code0 == CONST | |
563 | || code0 == SYMBOL_REF || code0 == LABEL_REF) | |
564 | { | |
565 | locB = &XEXP (x, 1); | |
566 | index_code = GET_CODE (XEXP (x, 0)); | |
567 | } | |
568 | else if (code1 == CONST_INT || code1 == CONST | |
569 | || code1 == SYMBOL_REF || code1 == LABEL_REF) | |
570 | { | |
571 | locB = &XEXP (x, 0); | |
572 | index_code = GET_CODE (XEXP (x, 1)); | |
573 | } | |
574 | else if (code0 == REG && code1 == REG) | |
575 | { | |
576 | int index_op; | |
577 | unsigned regno0 = REGNO (op0), regno1 = REGNO (op1); | |
578 | ||
579 | if (REGNO_OK_FOR_INDEX_P (regno1) | |
86fc3d06 | 580 | && regno_ok_for_base_p (regno0, mode, as, PLUS, REG)) |
fac41238 PB |
581 | index_op = 1; |
582 | else if (REGNO_OK_FOR_INDEX_P (regno0) | |
86fc3d06 | 583 | && regno_ok_for_base_p (regno1, mode, as, PLUS, REG)) |
fac41238 | 584 | index_op = 0; |
86fc3d06 | 585 | else if (regno_ok_for_base_p (regno0, mode, as, PLUS, REG) |
fac41238 PB |
586 | || REGNO_OK_FOR_INDEX_P (regno1)) |
587 | index_op = 1; | |
86fc3d06 | 588 | else if (regno_ok_for_base_p (regno1, mode, as, PLUS, REG)) |
fac41238 PB |
589 | index_op = 0; |
590 | else | |
591 | index_op = 1; | |
592 | ||
593 | locI = &XEXP (x, index_op); | |
594 | locB = &XEXP (x, !index_op); | |
595 | index_code = GET_CODE (*locI); | |
596 | } | |
597 | else if (code0 == REG) | |
598 | { | |
599 | locI = &XEXP (x, 0); | |
600 | locB = &XEXP (x, 1); | |
601 | index_code = GET_CODE (*locI); | |
602 | } | |
603 | else if (code1 == REG) | |
604 | { | |
605 | locI = &XEXP (x, 1); | |
606 | locB = &XEXP (x, 0); | |
607 | index_code = GET_CODE (*locI); | |
608 | } | |
609 | ||
610 | if (locI) | |
86fc3d06 UW |
611 | changed |= replace_oldest_value_addr (locI, INDEX_REG_CLASS, |
612 | mode, as, insn, vd); | |
fac41238 PB |
613 | if (locB) |
614 | changed |= replace_oldest_value_addr (locB, | |
86fc3d06 | 615 | base_reg_class (mode, as, PLUS, |
fac41238 | 616 | index_code), |
86fc3d06 | 617 | mode, as, insn, vd); |
fac41238 PB |
618 | return changed; |
619 | } | |
620 | ||
621 | case POST_INC: | |
622 | case POST_DEC: | |
623 | case POST_MODIFY: | |
624 | case PRE_INC: | |
625 | case PRE_DEC: | |
626 | case PRE_MODIFY: | |
627 | return false; | |
628 | ||
629 | case MEM: | |
630 | return replace_oldest_value_mem (x, insn, vd); | |
631 | ||
632 | case REG: | |
633 | return replace_oldest_value_reg (loc, cl, insn, vd); | |
634 | ||
635 | default: | |
636 | break; | |
637 | } | |
638 | ||
639 | fmt = GET_RTX_FORMAT (code); | |
640 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
641 | { | |
642 | if (fmt[i] == 'e') | |
86fc3d06 | 643 | changed |= replace_oldest_value_addr (&XEXP (x, i), cl, mode, as, |
fac41238 PB |
644 | insn, vd); |
645 | else if (fmt[i] == 'E') | |
646 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
647 | changed |= replace_oldest_value_addr (&XVECEXP (x, i, j), cl, | |
86fc3d06 | 648 | mode, as, insn, vd); |
fac41238 PB |
649 | } |
650 | ||
651 | return changed; | |
652 | } | |
653 | ||
654 | /* Similar to replace_oldest_value_reg, but X contains a memory. */ | |
655 | ||
656 | static bool | |
ea8175a4 | 657 | replace_oldest_value_mem (rtx x, rtx_insn *insn, struct value_data *vd) |
fac41238 | 658 | { |
b5b8b0ac AO |
659 | enum reg_class cl; |
660 | ||
661 | if (DEBUG_INSN_P (insn)) | |
662 | cl = ALL_REGS; | |
663 | else | |
86fc3d06 | 664 | cl = base_reg_class (GET_MODE (x), MEM_ADDR_SPACE (x), MEM, SCRATCH); |
b5b8b0ac AO |
665 | |
666 | return replace_oldest_value_addr (&XEXP (x, 0), cl, | |
86fc3d06 UW |
667 | GET_MODE (x), MEM_ADDR_SPACE (x), |
668 | insn, vd); | |
fac41238 PB |
669 | } |
670 | ||
e7140c8d JJ |
671 | /* Apply all queued updates for DEBUG_INSNs that change some reg to |
672 | register REGNO. */ | |
673 | ||
674 | static void | |
675 | apply_debug_insn_changes (struct value_data *vd, unsigned int regno) | |
676 | { | |
677 | struct queued_debug_insn_change *change; | |
ea8175a4 | 678 | rtx_insn *last_insn = vd->e[regno].debug_insn_changes->insn; |
e7140c8d JJ |
679 | |
680 | for (change = vd->e[regno].debug_insn_changes; | |
681 | change; | |
682 | change = change->next) | |
683 | { | |
684 | if (last_insn != change->insn) | |
685 | { | |
686 | apply_change_group (); | |
687 | last_insn = change->insn; | |
688 | } | |
689 | validate_change (change->insn, change->loc, change->new_rtx, 1); | |
690 | } | |
691 | apply_change_group (); | |
692 | } | |
693 | ||
e7140c8d JJ |
694 | /* Called via note_uses, for all used registers in a real insn |
695 | apply DEBUG_INSN changes that change registers to the used | |
696 | registers. */ | |
697 | ||
698 | static void | |
0d2e76b8 | 699 | cprop_find_used_regs (rtx *loc, void *data) |
e7140c8d | 700 | { |
0d2e76b8 RS |
701 | struct value_data *const vd = (struct value_data *) data; |
702 | subrtx_iterator::array_type array; | |
703 | FOR_EACH_SUBRTX (iter, array, *loc, NONCONST) | |
704 | { | |
705 | const_rtx x = *iter; | |
706 | if (REG_P (x)) | |
707 | { | |
708 | unsigned int regno = REGNO (x); | |
709 | if (vd->e[regno].debug_insn_changes) | |
710 | { | |
711 | apply_debug_insn_changes (vd, regno); | |
712 | free_debug_insn_changes (vd, regno); | |
713 | } | |
714 | } | |
715 | } | |
e7140c8d JJ |
716 | } |
717 | ||
486b97f2 TV |
718 | /* Apply clobbers of INSN in PATTERN and C_I_F_U to value_data VD. */ |
719 | ||
720 | static void | |
721 | kill_clobbered_values (rtx_insn *insn, struct value_data *vd) | |
722 | { | |
723 | note_stores (PATTERN (insn), kill_clobbered_value, vd); | |
724 | ||
725 | if (CALL_P (insn)) | |
726 | { | |
727 | rtx exp; | |
728 | ||
729 | for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1)) | |
730 | { | |
731 | rtx x = XEXP (exp, 0); | |
732 | if (GET_CODE (x) == CLOBBER) | |
733 | kill_value (SET_DEST (x), vd); | |
734 | } | |
735 | } | |
736 | } | |
737 | ||
fac41238 PB |
738 | /* Perform the forward copy propagation on basic block BB. */ |
739 | ||
740 | static bool | |
741 | copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd) | |
742 | { | |
b5b8b0ac | 743 | bool anything_changed = false; |
ea8175a4 | 744 | rtx_insn *insn; |
fac41238 PB |
745 | |
746 | for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn)) | |
747 | { | |
29d70a0f | 748 | int n_ops, i, predicated; |
fac41238 PB |
749 | bool is_asm, any_replacements; |
750 | rtx set; | |
c34fb198 | 751 | rtx link; |
fac41238 | 752 | bool replaced[MAX_RECOG_OPERANDS]; |
b5b8b0ac | 753 | bool changed = false; |
e384e6b5 | 754 | struct kill_set_value_data ksvd; |
fac41238 | 755 | |
b5b8b0ac | 756 | if (!NONDEBUG_INSN_P (insn)) |
fac41238 | 757 | { |
b5b8b0ac AO |
758 | if (DEBUG_INSN_P (insn)) |
759 | { | |
760 | rtx loc = INSN_VAR_LOCATION_LOC (insn); | |
e7140c8d JJ |
761 | if (!VAR_LOC_UNKNOWN_P (loc)) |
762 | replace_oldest_value_addr (&INSN_VAR_LOCATION_LOC (insn), | |
763 | ALL_REGS, GET_MODE (loc), | |
86fc3d06 | 764 | ADDR_SPACE_GENERIC, insn, vd); |
b5b8b0ac AO |
765 | } |
766 | ||
fac41238 PB |
767 | if (insn == BB_END (bb)) |
768 | break; | |
769 | else | |
770 | continue; | |
771 | } | |
772 | ||
773 | set = single_set (insn); | |
75d25a02 | 774 | extract_constrain_insn (insn); |
1145837d | 775 | preprocess_constraints (insn); |
5efe5dec | 776 | const operand_alternative *op_alt = which_op_alt (); |
fac41238 PB |
777 | n_ops = recog_data.n_operands; |
778 | is_asm = asm_noperands (PATTERN (insn)) >= 0; | |
779 | ||
5efe5dec | 780 | /* Simplify the code below by promoting OP_OUT to OP_INOUT |
fac41238 PB |
781 | in predicated instructions. */ |
782 | ||
783 | predicated = GET_CODE (PATTERN (insn)) == COND_EXEC; | |
784 | for (i = 0; i < n_ops; ++i) | |
785 | { | |
29d70a0f | 786 | int matches = op_alt[i].matches; |
29d70a0f | 787 | if (matches >= 0 || op_alt[i].matched >= 0 |
fac41238 PB |
788 | || (predicated && recog_data.operand_type[i] == OP_OUT)) |
789 | recog_data.operand_type[i] = OP_INOUT; | |
790 | } | |
791 | ||
e7140c8d JJ |
792 | /* Apply changes to earlier DEBUG_INSNs if possible. */ |
793 | if (vd->n_debug_insn_changes) | |
794 | note_uses (&PATTERN (insn), cprop_find_used_regs, vd); | |
795 | ||
fac41238 PB |
796 | /* For each earlyclobber operand, zap the value data. */ |
797 | for (i = 0; i < n_ops; i++) | |
29d70a0f | 798 | if (op_alt[i].earlyclobber) |
fac41238 PB |
799 | kill_value (recog_data.operand[i], vd); |
800 | ||
801 | /* Within asms, a clobber cannot overlap inputs or outputs. | |
802 | I wouldn't think this were true for regular insns, but | |
803 | scan_rtx treats them like that... */ | |
486b97f2 | 804 | kill_clobbered_values (insn, vd); |
fac41238 PB |
805 | |
806 | /* Kill all auto-incremented values. */ | |
807 | /* ??? REG_INC is useless, since stack pushes aren't done that way. */ | |
4ca738b3 | 808 | kill_autoinc_value (insn, vd); |
fac41238 PB |
809 | |
810 | /* Kill all early-clobbered operands. */ | |
811 | for (i = 0; i < n_ops; i++) | |
29d70a0f | 812 | if (op_alt[i].earlyclobber) |
fac41238 PB |
813 | kill_value (recog_data.operand[i], vd); |
814 | ||
c34fb198 RE |
815 | /* If we have dead sets in the insn, then we need to note these as we |
816 | would clobbers. */ | |
817 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) | |
818 | { | |
819 | if (REG_NOTE_KIND (link) == REG_UNUSED) | |
820 | { | |
821 | kill_value (XEXP (link, 0), vd); | |
822 | /* Furthermore, if the insn looked like a single-set, | |
823 | but the dead store kills the source value of that | |
824 | set, then we can no-longer use the plain move | |
825 | special case below. */ | |
826 | if (set | |
827 | && reg_overlap_mentioned_p (XEXP (link, 0), SET_SRC (set))) | |
828 | set = NULL; | |
829 | } | |
830 | } | |
831 | ||
fac41238 PB |
832 | /* Special-case plain move instructions, since we may well |
833 | be able to do the move from a different register class. */ | |
834 | if (set && REG_P (SET_SRC (set))) | |
835 | { | |
836 | rtx src = SET_SRC (set); | |
837 | unsigned int regno = REGNO (src); | |
ef4bddc2 | 838 | machine_mode mode = GET_MODE (src); |
fac41238 PB |
839 | unsigned int i; |
840 | rtx new_rtx; | |
841 | ||
842 | /* If we are accessing SRC in some mode other that what we | |
843 | set it in, make sure that the replacement is valid. */ | |
844 | if (mode != vd->e[regno].mode) | |
845 | { | |
846 | if (hard_regno_nregs[regno][mode] | |
847 | > hard_regno_nregs[regno][vd->e[regno].mode]) | |
848 | goto no_move_special_case; | |
26689420 DM |
849 | |
850 | /* And likewise, if we are narrowing on big endian the transformation | |
851 | is also invalid. */ | |
852 | if (hard_regno_nregs[regno][mode] | |
853 | < hard_regno_nregs[regno][vd->e[regno].mode] | |
854 | && (GET_MODE_SIZE (vd->e[regno].mode) > UNITS_PER_WORD | |
855 | ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) | |
856 | goto no_move_special_case; | |
fac41238 PB |
857 | } |
858 | ||
859 | /* If the destination is also a register, try to find a source | |
860 | register in the same class. */ | |
861 | if (REG_P (SET_DEST (set))) | |
862 | { | |
863 | new_rtx = find_oldest_value_reg (REGNO_REG_CLASS (regno), src, vd); | |
864 | if (new_rtx && validate_change (insn, &SET_SRC (set), new_rtx, 0)) | |
865 | { | |
866 | if (dump_file) | |
867 | fprintf (dump_file, | |
868 | "insn %u: replaced reg %u with %u\n", | |
869 | INSN_UID (insn), regno, REGNO (new_rtx)); | |
870 | changed = true; | |
871 | goto did_replacement; | |
872 | } | |
3147591f MS |
873 | /* We need to re-extract as validate_change clobbers |
874 | recog_data. */ | |
75d25a02 | 875 | extract_constrain_insn (insn); |
1145837d | 876 | preprocess_constraints (insn); |
fac41238 PB |
877 | } |
878 | ||
879 | /* Otherwise, try all valid registers and see if its valid. */ | |
880 | for (i = vd->e[regno].oldest_regno; i != regno; | |
881 | i = vd->e[i].next_regno) | |
882 | { | |
883 | new_rtx = maybe_mode_change (vd->e[i].mode, vd->e[regno].mode, | |
884 | mode, i, regno); | |
885 | if (new_rtx != NULL_RTX) | |
886 | { | |
887 | if (validate_change (insn, &SET_SRC (set), new_rtx, 0)) | |
888 | { | |
889 | ORIGINAL_REGNO (new_rtx) = ORIGINAL_REGNO (src); | |
890 | REG_ATTRS (new_rtx) = REG_ATTRS (src); | |
891 | REG_POINTER (new_rtx) = REG_POINTER (src); | |
892 | if (dump_file) | |
893 | fprintf (dump_file, | |
894 | "insn %u: replaced reg %u with %u\n", | |
895 | INSN_UID (insn), regno, REGNO (new_rtx)); | |
896 | changed = true; | |
897 | goto did_replacement; | |
898 | } | |
3147591f MS |
899 | /* We need to re-extract as validate_change clobbers |
900 | recog_data. */ | |
75d25a02 | 901 | extract_constrain_insn (insn); |
1145837d | 902 | preprocess_constraints (insn); |
fac41238 PB |
903 | } |
904 | } | |
905 | } | |
906 | no_move_special_case: | |
907 | ||
908 | any_replacements = false; | |
909 | ||
910 | /* For each input operand, replace a hard register with the | |
911 | eldest live copy that's in an appropriate register class. */ | |
912 | for (i = 0; i < n_ops; i++) | |
913 | { | |
914 | replaced[i] = false; | |
915 | ||
916 | /* Don't scan match_operand here, since we've no reg class | |
917 | information to pass down. Any operands that we could | |
918 | substitute in will be represented elsewhere. */ | |
919 | if (recog_data.constraints[i][0] == '\0') | |
920 | continue; | |
921 | ||
922 | /* Don't replace in asms intentionally referencing hard regs. */ | |
923 | if (is_asm && REG_P (recog_data.operand[i]) | |
924 | && (REGNO (recog_data.operand[i]) | |
925 | == ORIGINAL_REGNO (recog_data.operand[i]))) | |
926 | continue; | |
927 | ||
928 | if (recog_data.operand_type[i] == OP_IN) | |
929 | { | |
29d70a0f | 930 | if (op_alt[i].is_address) |
fac41238 PB |
931 | replaced[i] |
932 | = replace_oldest_value_addr (recog_data.operand_loc[i], | |
5efe5dec RS |
933 | alternative_class (op_alt, i), |
934 | VOIDmode, ADDR_SPACE_GENERIC, | |
935 | insn, vd); | |
fac41238 PB |
936 | else if (REG_P (recog_data.operand[i])) |
937 | replaced[i] | |
938 | = replace_oldest_value_reg (recog_data.operand_loc[i], | |
5efe5dec RS |
939 | alternative_class (op_alt, i), |
940 | insn, vd); | |
fac41238 PB |
941 | else if (MEM_P (recog_data.operand[i])) |
942 | replaced[i] = replace_oldest_value_mem (recog_data.operand[i], | |
943 | insn, vd); | |
944 | } | |
945 | else if (MEM_P (recog_data.operand[i])) | |
946 | replaced[i] = replace_oldest_value_mem (recog_data.operand[i], | |
947 | insn, vd); | |
948 | ||
949 | /* If we performed any replacement, update match_dups. */ | |
950 | if (replaced[i]) | |
951 | { | |
952 | int j; | |
953 | rtx new_rtx; | |
954 | ||
955 | new_rtx = *recog_data.operand_loc[i]; | |
956 | recog_data.operand[i] = new_rtx; | |
957 | for (j = 0; j < recog_data.n_dups; j++) | |
958 | if (recog_data.dup_num[j] == i) | |
959 | validate_unshare_change (insn, recog_data.dup_loc[j], new_rtx, 1); | |
960 | ||
961 | any_replacements = true; | |
962 | } | |
963 | } | |
964 | ||
965 | if (any_replacements) | |
966 | { | |
967 | if (! apply_change_group ()) | |
968 | { | |
969 | for (i = 0; i < n_ops; i++) | |
970 | if (replaced[i]) | |
971 | { | |
972 | rtx old = *recog_data.operand_loc[i]; | |
973 | recog_data.operand[i] = old; | |
974 | } | |
975 | ||
976 | if (dump_file) | |
977 | fprintf (dump_file, | |
978 | "insn %u: reg replacements not verified\n", | |
979 | INSN_UID (insn)); | |
980 | } | |
981 | else | |
982 | changed = true; | |
983 | } | |
984 | ||
985 | did_replacement: | |
b5b8b0ac | 986 | if (changed) |
828f2c8b JJ |
987 | { |
988 | anything_changed = true; | |
989 | ||
990 | /* If something changed, perhaps further changes to earlier | |
991 | DEBUG_INSNs can be applied. */ | |
992 | if (vd->n_debug_insn_changes) | |
993 | note_uses (&PATTERN (insn), cprop_find_used_regs, vd); | |
994 | } | |
b5b8b0ac | 995 | |
e384e6b5 BS |
996 | ksvd.vd = vd; |
997 | ksvd.ignore_set_reg = NULL_RTX; | |
998 | ||
fac41238 PB |
999 | /* Clobber call-clobbered registers. */ |
1000 | if (CALL_P (insn)) | |
e384e6b5 | 1001 | { |
c7fb4c7a SB |
1002 | unsigned int set_regno = INVALID_REGNUM; |
1003 | unsigned int set_nregs = 0; | |
1004 | unsigned int regno; | |
e384e6b5 | 1005 | rtx exp; |
8d696651 | 1006 | HARD_REG_SET regs_invalidated_by_this_call; |
c7fb4c7a | 1007 | |
e384e6b5 BS |
1008 | for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1)) |
1009 | { | |
1010 | rtx x = XEXP (exp, 0); | |
1011 | if (GET_CODE (x) == SET) | |
1012 | { | |
1013 | rtx dest = SET_DEST (x); | |
1014 | kill_value (dest, vd); | |
1015 | set_value_regno (REGNO (dest), GET_MODE (dest), vd); | |
1016 | copy_value (dest, SET_SRC (x), vd); | |
1017 | ksvd.ignore_set_reg = dest; | |
1018 | set_regno = REGNO (dest); | |
dc8afb70 | 1019 | set_nregs = REG_NREGS (dest); |
e384e6b5 BS |
1020 | break; |
1021 | } | |
1022 | } | |
c7fb4c7a | 1023 | |
8d696651 TV |
1024 | get_call_reg_set_usage (insn, |
1025 | ®s_invalidated_by_this_call, | |
1026 | regs_invalidated_by_call); | |
9ccac701 | 1027 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) |
8d696651 | 1028 | if ((TEST_HARD_REG_BIT (regs_invalidated_by_this_call, regno) |
9ccac701 MF |
1029 | || HARD_REGNO_CALL_PART_CLOBBERED (regno, vd->e[regno].mode)) |
1030 | && (regno < set_regno || regno >= set_regno + set_nregs)) | |
c7fb4c7a | 1031 | kill_value_regno (regno, 1, vd); |
c5a44004 JJ |
1032 | |
1033 | /* If SET was seen in CALL_INSN_FUNCTION_USAGE, and SET_SRC | |
1034 | of the SET isn't in regs_invalidated_by_call hard reg set, | |
1035 | but instead among CLOBBERs on the CALL_INSN, we could wrongly | |
1036 | assume the value in it is still live. */ | |
1037 | if (ksvd.ignore_set_reg) | |
486b97f2 | 1038 | kill_clobbered_values (insn, vd); |
e384e6b5 | 1039 | } |
fac41238 | 1040 | |
8c8fe663 TV |
1041 | bool copy_p = (set |
1042 | && REG_P (SET_DEST (set)) | |
1043 | && REG_P (SET_SRC (set))); | |
1044 | bool noop_p = (copy_p | |
1045 | && rtx_equal_p (SET_DEST (set), SET_SRC (set))); | |
fac41238 | 1046 | |
8c8fe663 TV |
1047 | if (!noop_p) |
1048 | { | |
1049 | /* Notice stores. */ | |
1050 | note_stores (PATTERN (insn), kill_set_value, &ksvd); | |
1051 | ||
1052 | /* Notice copies. */ | |
1053 | if (copy_p) | |
1054 | copy_value (SET_DEST (set), SET_SRC (set), vd); | |
1055 | } | |
fac41238 PB |
1056 | |
1057 | if (insn == BB_END (bb)) | |
1058 | break; | |
1059 | } | |
1060 | ||
b5b8b0ac | 1061 | return anything_changed; |
fac41238 PB |
1062 | } |
1063 | ||
fac41238 PB |
1064 | /* Dump the value chain data to stderr. */ |
1065 | ||
24e47c76 | 1066 | DEBUG_FUNCTION void |
fac41238 PB |
1067 | debug_value_data (struct value_data *vd) |
1068 | { | |
1069 | HARD_REG_SET set; | |
1070 | unsigned int i, j; | |
1071 | ||
1072 | CLEAR_HARD_REG_SET (set); | |
1073 | ||
1074 | for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) | |
1075 | if (vd->e[i].oldest_regno == i) | |
1076 | { | |
1077 | if (vd->e[i].mode == VOIDmode) | |
1078 | { | |
1079 | if (vd->e[i].next_regno != INVALID_REGNUM) | |
1080 | fprintf (stderr, "[%u] Bad next_regno for empty chain (%u)\n", | |
1081 | i, vd->e[i].next_regno); | |
1082 | continue; | |
1083 | } | |
1084 | ||
1085 | SET_HARD_REG_BIT (set, i); | |
1086 | fprintf (stderr, "[%u %s] ", i, GET_MODE_NAME (vd->e[i].mode)); | |
1087 | ||
1088 | for (j = vd->e[i].next_regno; | |
1089 | j != INVALID_REGNUM; | |
1090 | j = vd->e[j].next_regno) | |
1091 | { | |
1092 | if (TEST_HARD_REG_BIT (set, j)) | |
1093 | { | |
1094 | fprintf (stderr, "[%u] Loop in regno chain\n", j); | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | if (vd->e[j].oldest_regno != i) | |
1099 | { | |
1100 | fprintf (stderr, "[%u] Bad oldest_regno (%u)\n", | |
1101 | j, vd->e[j].oldest_regno); | |
1102 | return; | |
1103 | } | |
1104 | SET_HARD_REG_BIT (set, j); | |
1105 | fprintf (stderr, "[%u %s] ", j, GET_MODE_NAME (vd->e[j].mode)); | |
1106 | } | |
1107 | fputc ('\n', stderr); | |
1108 | } | |
1109 | ||
1110 | for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) | |
1111 | if (! TEST_HARD_REG_BIT (set, i) | |
1112 | && (vd->e[i].mode != VOIDmode | |
1113 | || vd->e[i].oldest_regno != i | |
1114 | || vd->e[i].next_regno != INVALID_REGNUM)) | |
1115 | fprintf (stderr, "[%u] Non-empty reg in chain (%s %u %i)\n", | |
1116 | i, GET_MODE_NAME (vd->e[i].mode), vd->e[i].oldest_regno, | |
1117 | vd->e[i].next_regno); | |
1118 | } | |
1119 | ||
a2e6c10c ZC |
1120 | /* Do copyprop_hardreg_forward_1 for a single basic block BB. |
1121 | DEBUG_INSN is skipped since we do not want to involve DF related | |
1122 | staff as how it is handled in function pass_cprop_hardreg::execute. | |
1123 | ||
1124 | NOTE: Currently it is only used for shrink-wrap. Maybe extend it | |
1125 | to handle DEBUG_INSN for other uses. */ | |
1126 | ||
1127 | void | |
1128 | copyprop_hardreg_forward_bb_without_debug_insn (basic_block bb) | |
1129 | { | |
1130 | struct value_data *vd; | |
1131 | vd = XNEWVEC (struct value_data, 1); | |
1132 | init_value_data (vd); | |
1133 | ||
1134 | skip_debug_insn_p = true; | |
1135 | copyprop_hardreg_forward_1 (bb, vd); | |
1136 | free (vd); | |
1137 | skip_debug_insn_p = false; | |
1138 | } | |
1139 | ||
fac41238 PB |
1140 | static void |
1141 | validate_value_data (struct value_data *vd) | |
1142 | { | |
1143 | HARD_REG_SET set; | |
1144 | unsigned int i, j; | |
1145 | ||
1146 | CLEAR_HARD_REG_SET (set); | |
1147 | ||
1148 | for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) | |
1149 | if (vd->e[i].oldest_regno == i) | |
1150 | { | |
1151 | if (vd->e[i].mode == VOIDmode) | |
1152 | { | |
1153 | if (vd->e[i].next_regno != INVALID_REGNUM) | |
1154 | internal_error ("validate_value_data: [%u] Bad next_regno for empty chain (%u)", | |
1155 | i, vd->e[i].next_regno); | |
1156 | continue; | |
1157 | } | |
1158 | ||
1159 | SET_HARD_REG_BIT (set, i); | |
1160 | ||
1161 | for (j = vd->e[i].next_regno; | |
1162 | j != INVALID_REGNUM; | |
1163 | j = vd->e[j].next_regno) | |
1164 | { | |
1165 | if (TEST_HARD_REG_BIT (set, j)) | |
1166 | internal_error ("validate_value_data: Loop in regno chain (%u)", | |
1167 | j); | |
1168 | if (vd->e[j].oldest_regno != i) | |
1169 | internal_error ("validate_value_data: [%u] Bad oldest_regno (%u)", | |
1170 | j, vd->e[j].oldest_regno); | |
1171 | ||
1172 | SET_HARD_REG_BIT (set, j); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) | |
1177 | if (! TEST_HARD_REG_BIT (set, i) | |
1178 | && (vd->e[i].mode != VOIDmode | |
1179 | || vd->e[i].oldest_regno != i | |
1180 | || vd->e[i].next_regno != INVALID_REGNUM)) | |
1181 | internal_error ("validate_value_data: [%u] Non-empty reg in chain (%s %u %i)", | |
1182 | i, GET_MODE_NAME (vd->e[i].mode), vd->e[i].oldest_regno, | |
1183 | vd->e[i].next_regno); | |
1184 | } | |
b2b29377 | 1185 | |
fac41238 | 1186 | \f |
27a4cd48 DM |
1187 | namespace { |
1188 | ||
1189 | const pass_data pass_data_cprop_hardreg = | |
fac41238 | 1190 | { |
27a4cd48 DM |
1191 | RTL_PASS, /* type */ |
1192 | "cprop_hardreg", /* name */ | |
1193 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
1194 | TV_CPROP_REGISTERS, /* tv_id */ |
1195 | 0, /* properties_required */ | |
1196 | 0, /* properties_provided */ | |
1197 | 0, /* properties_destroyed */ | |
1198 | 0, /* todo_flags_start */ | |
3bea341f | 1199 | TODO_df_finish, /* todo_flags_finish */ |
fac41238 | 1200 | }; |
27a4cd48 DM |
1201 | |
1202 | class pass_cprop_hardreg : public rtl_opt_pass | |
1203 | { | |
1204 | public: | |
c3284718 RS |
1205 | pass_cprop_hardreg (gcc::context *ctxt) |
1206 | : rtl_opt_pass (pass_data_cprop_hardreg, ctxt) | |
27a4cd48 DM |
1207 | {} |
1208 | ||
1209 | /* opt_pass methods: */ | |
1a3d085c TS |
1210 | virtual bool gate (function *) |
1211 | { | |
1212 | return (optimize > 0 && (flag_cprop_registers)); | |
1213 | } | |
1214 | ||
be55bfe6 | 1215 | virtual unsigned int execute (function *); |
27a4cd48 DM |
1216 | |
1217 | }; // class pass_cprop_hardreg | |
1218 | ||
be55bfe6 TS |
1219 | unsigned int |
1220 | pass_cprop_hardreg::execute (function *fun) | |
1221 | { | |
1222 | struct value_data *all_vd; | |
1223 | basic_block bb; | |
1224 | sbitmap visited; | |
1225 | bool analyze_called = false; | |
1226 | ||
1227 | all_vd = XNEWVEC (struct value_data, last_basic_block_for_fn (fun)); | |
1228 | ||
1229 | visited = sbitmap_alloc (last_basic_block_for_fn (fun)); | |
1230 | bitmap_clear (visited); | |
1231 | ||
be55bfe6 TS |
1232 | FOR_EACH_BB_FN (bb, fun) |
1233 | { | |
1234 | bitmap_set_bit (visited, bb->index); | |
1235 | ||
1236 | /* If a block has a single predecessor, that we've already | |
1237 | processed, begin with the value data that was live at | |
1238 | the end of the predecessor block. */ | |
1239 | /* ??? Ought to use more intelligent queuing of blocks. */ | |
1240 | if (single_pred_p (bb) | |
1241 | && bitmap_bit_p (visited, single_pred (bb)->index) | |
1242 | && ! (single_pred_edge (bb)->flags & (EDGE_ABNORMAL_CALL | EDGE_EH))) | |
1243 | { | |
1244 | all_vd[bb->index] = all_vd[single_pred (bb)->index]; | |
1245 | if (all_vd[bb->index].n_debug_insn_changes) | |
1246 | { | |
1247 | unsigned int regno; | |
1248 | ||
1249 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
1250 | { | |
1251 | if (all_vd[bb->index].e[regno].debug_insn_changes) | |
1252 | { | |
1253 | all_vd[bb->index].e[regno].debug_insn_changes = NULL; | |
1254 | if (--all_vd[bb->index].n_debug_insn_changes == 0) | |
1255 | break; | |
1256 | } | |
1257 | } | |
1258 | } | |
1259 | } | |
1260 | else | |
1261 | init_value_data (all_vd + bb->index); | |
1262 | ||
1263 | copyprop_hardreg_forward_1 (bb, all_vd + bb->index); | |
1264 | } | |
1265 | ||
1266 | if (MAY_HAVE_DEBUG_INSNS) | |
1267 | { | |
1268 | FOR_EACH_BB_FN (bb, fun) | |
1269 | if (bitmap_bit_p (visited, bb->index) | |
1270 | && all_vd[bb->index].n_debug_insn_changes) | |
1271 | { | |
1272 | unsigned int regno; | |
1273 | bitmap live; | |
1274 | ||
1275 | if (!analyze_called) | |
1276 | { | |
1277 | df_analyze (); | |
1278 | analyze_called = true; | |
1279 | } | |
1280 | live = df_get_live_out (bb); | |
1281 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
1282 | if (all_vd[bb->index].e[regno].debug_insn_changes) | |
1283 | { | |
1284 | if (REGNO_REG_SET_P (live, regno)) | |
1285 | apply_debug_insn_changes (all_vd + bb->index, regno); | |
1286 | if (all_vd[bb->index].n_debug_insn_changes == 0) | |
1287 | break; | |
1288 | } | |
1289 | } | |
1290 | ||
fb0b2914 | 1291 | queued_debug_insn_change_pool.release (); |
be55bfe6 TS |
1292 | } |
1293 | ||
1294 | sbitmap_free (visited); | |
1295 | free (all_vd); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
27a4cd48 DM |
1299 | } // anon namespace |
1300 | ||
1301 | rtl_opt_pass * | |
1302 | make_pass_cprop_hardreg (gcc::context *ctxt) | |
1303 | { | |
1304 | return new pass_cprop_hardreg (ctxt); | |
1305 | } |