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8d2af3a2 | 1 | /* Target machine subroutines for TI PRU. |
8d9254fc | 2 | Copyright (C) 2014-2020 Free Software Foundation, Inc. |
8d2af3a2 DD |
3 | Dimitar Dimitrov <dimitar@dinux.eu> |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published | |
9 | by the Free Software Foundation; either version 3, or (at your | |
10 | option) any later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #define IN_TARGET_CODE 1 | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "coretypes.h" | |
26 | #include "backend.h" | |
27 | #include "target.h" | |
28 | #include "rtl.h" | |
29 | #include "tree.h" | |
30 | #include "stringpool.h" | |
31 | #include "attribs.h" | |
32 | #include "df.h" | |
33 | #include "memmodel.h" | |
34 | #include "tm_p.h" | |
35 | #include "optabs.h" | |
36 | #include "regs.h" | |
37 | #include "emit-rtl.h" | |
38 | #include "recog.h" | |
39 | #include "diagnostic-core.h" | |
40 | #include "output.h" | |
41 | #include "insn-attr.h" | |
42 | #include "flags.h" | |
43 | #include "explow.h" | |
44 | #include "calls.h" | |
45 | #include "varasm.h" | |
46 | #include "expr.h" | |
47 | #include "toplev.h" | |
48 | #include "langhooks.h" | |
49 | #include "cfgrtl.h" | |
50 | #include "stor-layout.h" | |
51 | #include "dumpfile.h" | |
52 | #include "builtins.h" | |
53 | #include "pru-protos.h" | |
54 | ||
55 | /* This file should be included last. */ | |
56 | #include "target-def.h" | |
57 | ||
58 | #define INIT_ARRAY_ENTRY_BYTES 2 | |
59 | ||
60 | /* Global PRU CTABLE entries, filled in by pragmas, and used for fast | |
61 | addressing via LBCO/SBCO instructions. */ | |
62 | struct pru_ctable_entry pru_ctable[32]; | |
63 | ||
64 | /* Forward function declarations. */ | |
65 | static bool prologue_saved_reg_p (int); | |
66 | static void pru_reorg_loop (rtx_insn *); | |
67 | ||
68 | struct GTY (()) machine_function | |
69 | { | |
70 | /* Current frame information, to be filled in by pru_compute_frame_layout | |
71 | with register save masks, and offsets for the current function. */ | |
72 | ||
73 | /* Mask of registers to save. */ | |
74 | HARD_REG_SET save_mask; | |
75 | /* Number of bytes that the entire frame takes up. */ | |
76 | int total_size; | |
77 | /* Number of bytes that variables take up. */ | |
78 | int var_size; | |
79 | /* Number of bytes that outgoing arguments take up. */ | |
80 | int out_args_size; | |
81 | /* Number of bytes needed to store registers in frame. */ | |
82 | int save_reg_size; | |
83 | /* Offset from new stack pointer to store registers. */ | |
84 | int save_regs_offset; | |
85 | /* True if final frame layout is already calculated. */ | |
86 | bool initialized; | |
87 | /* Number of doloop tags used so far. */ | |
88 | int doloop_tags; | |
89 | /* True if the last tag was allocated to a doloop_end. */ | |
90 | bool doloop_tag_from_end; | |
91 | }; | |
92 | \f | |
93 | /* Stack layout and calling conventions. | |
94 | ||
95 | The PRU ABI defines r4 as Argument Pointer. GCC implements the same | |
96 | semantics, but represents it with HARD_FRAME_POINTER_REGNUM and | |
97 | names it FP. The stack layout is shown below: | |
98 | ||
99 | ---------------------- high address | |
100 | | incoming args | |
101 | ------call-boundary--- | |
102 | | pretend_args ^ | |
103 | FP ---------------- | total | |
104 | | save_regs | frame | |
105 | --------------- | size | |
106 | | local vars | | |
107 | --------------- | | |
108 | | outgoing args V | |
109 | SP ---------------------- low address | |
110 | ||
111 | */ | |
112 | ||
113 | #define PRU_STACK_ALIGN(LOC) ROUND_UP ((LOC), STACK_BOUNDARY / BITS_PER_UNIT) | |
114 | ||
115 | /* Implement TARGET_COMPUTE_FRAME_LAYOUT. */ | |
116 | static void | |
117 | pru_compute_frame_layout (void) | |
118 | { | |
119 | int regno; | |
120 | HARD_REG_SET *save_mask; | |
121 | int total_size; | |
122 | int var_size; | |
123 | int out_args_size; | |
124 | int save_reg_size; | |
125 | ||
126 | gcc_assert (!cfun->machine->initialized); | |
127 | ||
128 | save_mask = &cfun->machine->save_mask; | |
129 | CLEAR_HARD_REG_SET (*save_mask); | |
130 | ||
131 | var_size = PRU_STACK_ALIGN ((HOST_WIDE_INT) get_frame_size ()); | |
132 | out_args_size = PRU_STACK_ALIGN ((HOST_WIDE_INT) crtl->outgoing_args_size); | |
133 | total_size = var_size + out_args_size; | |
134 | ||
135 | /* Calculate space needed for gp registers. */ | |
136 | save_reg_size = 0; | |
137 | for (regno = 0; regno <= LAST_GP_REGNUM; regno++) | |
138 | if (prologue_saved_reg_p (regno)) | |
139 | { | |
140 | SET_HARD_REG_BIT (*save_mask, regno); | |
141 | save_reg_size += 1; | |
142 | } | |
143 | ||
144 | save_reg_size = PRU_STACK_ALIGN (save_reg_size); | |
145 | total_size += save_reg_size; | |
146 | total_size += PRU_STACK_ALIGN (crtl->args.pretend_args_size); | |
147 | ||
148 | /* Save other computed information. */ | |
149 | cfun->machine->total_size = total_size; | |
150 | cfun->machine->var_size = var_size; | |
151 | cfun->machine->out_args_size = out_args_size; | |
152 | cfun->machine->save_reg_size = save_reg_size; | |
153 | cfun->machine->initialized = reload_completed; | |
154 | cfun->machine->save_regs_offset = out_args_size + var_size; | |
155 | } | |
156 | ||
157 | /* Emit efficient RTL equivalent of ADD3 with the given const_int for | |
158 | frame-related registers. | |
159 | op0 - Destination register. | |
160 | op1 - First addendum operand (a register). | |
161 | addendum - Second addendum operand (a constant). | |
162 | kind - Note kind. REG_NOTE_MAX if no note must be added. | |
163 | */ | |
164 | static rtx | |
165 | pru_add3_frame_adjust (rtx op0, rtx op1, int addendum, | |
166 | const enum reg_note kind) | |
167 | { | |
168 | rtx insn; | |
169 | ||
170 | rtx op0_adjust = gen_rtx_SET (op0, plus_constant (Pmode, op1, addendum)); | |
171 | ||
172 | if (UBYTE_INT (addendum) || UBYTE_INT (-addendum)) | |
173 | insn = emit_insn (op0_adjust); | |
174 | else | |
175 | { | |
176 | /* Help the compiler to cope with an arbitrary integer constant. | |
177 | Reload has finished so we can't expect the compiler to | |
178 | auto-allocate a temporary register. But we know that call-saved | |
179 | registers are not live yet, so we utilize them. */ | |
180 | rtx tmpreg = gen_rtx_REG (Pmode, PROLOGUE_TEMP_REGNUM); | |
181 | if (addendum < 0) | |
182 | { | |
183 | emit_insn (gen_rtx_SET (tmpreg, gen_int_mode (-addendum, Pmode))); | |
184 | insn = emit_insn (gen_sub3_insn (op0, op1, tmpreg)); | |
185 | } | |
186 | else | |
187 | { | |
188 | emit_insn (gen_rtx_SET (tmpreg, gen_int_mode (addendum, Pmode))); | |
189 | insn = emit_insn (gen_add3_insn (op0, op1, tmpreg)); | |
190 | } | |
191 | } | |
192 | ||
193 | /* Attach a note indicating what happened. */ | |
194 | if (kind != REG_NOTE_MAX) | |
195 | add_reg_note (insn, kind, copy_rtx (op0_adjust)); | |
196 | ||
197 | RTX_FRAME_RELATED_P (insn) = 1; | |
198 | ||
199 | return insn; | |
200 | } | |
201 | ||
202 | /* Add a const_int to the stack pointer register. */ | |
203 | static rtx | |
204 | pru_add_to_sp (int addendum, const enum reg_note kind) | |
205 | { | |
206 | return pru_add3_frame_adjust (stack_pointer_rtx, stack_pointer_rtx, | |
207 | addendum, kind); | |
208 | } | |
209 | ||
210 | /* Helper function used during prologue/epilogue. Emits a single LBBO/SBBO | |
211 | instruction for load/store of the next group of consecutive registers. */ | |
212 | static int | |
213 | xbbo_next_reg_cluster (int regno_start, int *sp_offset, bool do_store) | |
214 | { | |
215 | int regno, nregs, i; | |
216 | rtx addr; | |
217 | rtx_insn *insn; | |
218 | ||
219 | nregs = 0; | |
220 | ||
221 | /* Skip the empty slots. */ | |
222 | for (; regno_start <= LAST_GP_REGNUM;) | |
223 | if (TEST_HARD_REG_BIT (cfun->machine->save_mask, regno_start)) | |
224 | break; | |
225 | else | |
226 | regno_start++; | |
227 | ||
228 | /* Find the largest consecutive group of registers to save. */ | |
229 | for (regno = regno_start; regno <= LAST_GP_REGNUM;) | |
230 | if (TEST_HARD_REG_BIT (cfun->machine->save_mask, regno)) | |
231 | { | |
232 | regno++; | |
233 | nregs++; | |
234 | } | |
235 | else | |
236 | break; | |
237 | ||
238 | if (!nregs) | |
239 | return -1; | |
240 | ||
241 | gcc_assert (UBYTE_INT (*sp_offset)); | |
242 | ||
243 | /* Ok, save this bunch. */ | |
244 | addr = plus_constant (Pmode, stack_pointer_rtx, *sp_offset); | |
245 | ||
246 | if (do_store) | |
247 | insn = targetm.gen_store_multiple (gen_frame_mem (BLKmode, addr), | |
248 | gen_rtx_REG (QImode, regno_start), | |
249 | GEN_INT (nregs)); | |
250 | else | |
251 | insn = targetm.gen_load_multiple (gen_rtx_REG (QImode, regno_start), | |
252 | gen_frame_mem (BLKmode, addr), | |
253 | GEN_INT (nregs)); | |
254 | ||
255 | gcc_assert (reload_completed); | |
256 | gcc_assert (insn); | |
257 | emit_insn (insn); | |
258 | ||
259 | /* Tag as frame-related. */ | |
260 | RTX_FRAME_RELATED_P (insn) = 1; | |
261 | ||
262 | if (!do_store) | |
263 | { | |
264 | /* Tag epilogue unwind notes. */ | |
265 | for (i = regno_start; i < (regno_start + nregs); i++) | |
266 | add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (QImode, i)); | |
267 | } | |
268 | ||
269 | /* Increment and save offset in anticipation of the next register group. */ | |
270 | *sp_offset += nregs * UNITS_PER_WORD; | |
271 | ||
272 | return regno_start + nregs; | |
273 | } | |
274 | ||
275 | /* Emit function prologue. */ | |
276 | void | |
277 | pru_expand_prologue (void) | |
278 | { | |
279 | int regno_start; | |
280 | int total_frame_size; | |
281 | int sp_offset; /* Offset from base_reg to final stack value. */ | |
282 | int save_regs_base; /* Offset from base_reg to register save area. */ | |
283 | int save_offset; /* Temporary offset to currently saved register group. */ | |
284 | ||
285 | total_frame_size = cfun->machine->total_size; | |
286 | ||
287 | if (flag_stack_usage_info) | |
288 | current_function_static_stack_size = total_frame_size; | |
289 | ||
290 | /* Decrement the stack pointer. */ | |
291 | if (!UBYTE_INT (total_frame_size)) | |
292 | { | |
293 | /* We need an intermediary point, this will point at the spill block. */ | |
294 | pru_add_to_sp (cfun->machine->save_regs_offset - total_frame_size, | |
295 | REG_NOTE_MAX); | |
296 | save_regs_base = 0; | |
297 | sp_offset = -cfun->machine->save_regs_offset; | |
298 | } | |
299 | else if (total_frame_size) | |
300 | { | |
301 | pru_add_to_sp (- total_frame_size, REG_NOTE_MAX); | |
302 | save_regs_base = cfun->machine->save_regs_offset; | |
303 | sp_offset = 0; | |
304 | } | |
305 | else | |
306 | save_regs_base = sp_offset = 0; | |
307 | ||
308 | regno_start = 0; | |
309 | save_offset = save_regs_base; | |
310 | do | |
311 | regno_start = xbbo_next_reg_cluster (regno_start, &save_offset, true); | |
312 | while (regno_start >= 0); | |
313 | ||
314 | /* Set FP before adjusting SP. This way fp_offset has | |
315 | better chance to fit in UBYTE. */ | |
316 | if (frame_pointer_needed) | |
317 | { | |
318 | int fp_offset = total_frame_size | |
319 | - crtl->args.pretend_args_size | |
320 | + sp_offset; | |
321 | ||
322 | pru_add3_frame_adjust (hard_frame_pointer_rtx, stack_pointer_rtx, | |
323 | fp_offset, REG_NOTE_MAX); | |
324 | } | |
325 | ||
326 | if (sp_offset) | |
327 | pru_add_to_sp (sp_offset, REG_FRAME_RELATED_EXPR); | |
328 | ||
329 | /* If we are profiling, make sure no instructions are scheduled before | |
330 | the call to mcount. */ | |
331 | if (crtl->profile) | |
332 | emit_insn (gen_blockage ()); | |
333 | } | |
334 | ||
335 | /* Emit function epilogue. */ | |
336 | void | |
337 | pru_expand_epilogue (bool sibcall_p) | |
338 | { | |
339 | int total_frame_size; | |
340 | int sp_adjust, save_offset; | |
341 | int regno_start; | |
342 | ||
343 | if (!sibcall_p && pru_can_use_return_insn ()) | |
344 | { | |
345 | emit_jump_insn (gen_return ()); | |
346 | return; | |
347 | } | |
348 | ||
349 | emit_insn (gen_blockage ()); | |
350 | ||
351 | total_frame_size = cfun->machine->total_size; | |
352 | ||
353 | if (frame_pointer_needed) | |
354 | { | |
355 | /* Recover the stack pointer. */ | |
356 | pru_add3_frame_adjust (stack_pointer_rtx, hard_frame_pointer_rtx, | |
357 | - cfun->machine->save_reg_size, | |
358 | REG_CFA_ADJUST_CFA); | |
359 | ||
360 | save_offset = 0; | |
361 | sp_adjust = total_frame_size - cfun->machine->save_regs_offset; | |
362 | } | |
363 | else if (!UBYTE_INT (total_frame_size)) | |
364 | { | |
365 | pru_add_to_sp (cfun->machine->save_regs_offset, REG_CFA_ADJUST_CFA); | |
366 | save_offset = 0; | |
367 | sp_adjust = total_frame_size - cfun->machine->save_regs_offset; | |
368 | } | |
369 | else | |
370 | { | |
371 | save_offset = cfun->machine->save_regs_offset; | |
372 | sp_adjust = total_frame_size; | |
373 | } | |
374 | ||
375 | regno_start = 0; | |
376 | do | |
377 | regno_start = xbbo_next_reg_cluster (regno_start, &save_offset, false); | |
378 | while (regno_start >= 0); | |
379 | ||
380 | /* Emit a blockage insn here to keep these insns from being moved to | |
381 | an earlier spot in the epilogue. | |
382 | ||
383 | This is necessary as we must not cut the stack back before all the | |
384 | restores are finished. */ | |
385 | emit_insn (gen_blockage ()); | |
386 | ||
387 | if (sp_adjust) | |
388 | pru_add_to_sp (sp_adjust, REG_CFA_ADJUST_CFA); | |
389 | ||
390 | if (!sibcall_p) | |
391 | emit_jump_insn (gen_simple_return ()); | |
392 | } | |
393 | ||
394 | /* Implement RETURN_ADDR_RTX. Note, we do not support moving | |
395 | back to a previous frame. */ | |
396 | rtx | |
397 | pru_get_return_address (int count) | |
398 | { | |
399 | if (count != 0) | |
400 | return NULL_RTX; | |
401 | ||
402 | /* Return r3.w2. */ | |
403 | return get_hard_reg_initial_val (HImode, RA_REGNUM); | |
404 | } | |
405 | ||
406 | /* Implement FUNCTION_PROFILER macro. */ | |
407 | void | |
408 | pru_function_profiler (FILE *file, int labelno ATTRIBUTE_UNUSED) | |
409 | { | |
410 | fprintf (file, "\tmov\tr1, ra\n"); | |
411 | fprintf (file, "\tcall\t_mcount\n"); | |
412 | fprintf (file, "\tmov\tra, r1\n"); | |
413 | } | |
414 | ||
415 | /* Dump stack layout. */ | |
416 | static void | |
417 | pru_dump_frame_layout (FILE *file) | |
418 | { | |
419 | fprintf (file, "\t%s Current Frame Info\n", ASM_COMMENT_START); | |
420 | fprintf (file, "\t%s total_size = %d\n", ASM_COMMENT_START, | |
421 | cfun->machine->total_size); | |
422 | fprintf (file, "\t%s var_size = %d\n", ASM_COMMENT_START, | |
423 | cfun->machine->var_size); | |
424 | fprintf (file, "\t%s out_args_size = %d\n", ASM_COMMENT_START, | |
425 | cfun->machine->out_args_size); | |
426 | fprintf (file, "\t%s save_reg_size = %d\n", ASM_COMMENT_START, | |
427 | cfun->machine->save_reg_size); | |
428 | fprintf (file, "\t%s initialized = %d\n", ASM_COMMENT_START, | |
429 | cfun->machine->initialized); | |
430 | fprintf (file, "\t%s save_regs_offset = %d\n", ASM_COMMENT_START, | |
431 | cfun->machine->save_regs_offset); | |
432 | fprintf (file, "\t%s is_leaf = %d\n", ASM_COMMENT_START, | |
433 | crtl->is_leaf); | |
434 | fprintf (file, "\t%s frame_pointer_needed = %d\n", ASM_COMMENT_START, | |
435 | frame_pointer_needed); | |
436 | fprintf (file, "\t%s pretend_args_size = %d\n", ASM_COMMENT_START, | |
437 | crtl->args.pretend_args_size); | |
438 | } | |
439 | ||
440 | /* Return true if REGNO should be saved in the prologue. */ | |
441 | static bool | |
442 | prologue_saved_reg_p (int regno) | |
443 | { | |
444 | gcc_assert (GP_REG_P (regno)); | |
445 | ||
a365fa06 | 446 | if (df_regs_ever_live_p (regno) && !call_used_or_fixed_reg_p (regno)) |
8d2af3a2 DD |
447 | return true; |
448 | ||
449 | /* 32-bit FP. */ | |
450 | if (frame_pointer_needed | |
451 | && regno >= HARD_FRAME_POINTER_REGNUM | |
452 | && regno < HARD_FRAME_POINTER_REGNUM + GET_MODE_SIZE (Pmode)) | |
453 | return true; | |
454 | ||
455 | /* 16-bit RA. */ | |
456 | if (regno == RA_REGNUM && df_regs_ever_live_p (RA_REGNUM)) | |
457 | return true; | |
458 | if (regno == RA_REGNUM + 1 && df_regs_ever_live_p (RA_REGNUM + 1)) | |
459 | return true; | |
460 | ||
461 | return false; | |
462 | } | |
463 | ||
464 | /* Implement TARGET_CAN_ELIMINATE. */ | |
465 | static bool | |
466 | pru_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) | |
467 | { | |
468 | if (to == STACK_POINTER_REGNUM) | |
469 | return !frame_pointer_needed; | |
470 | return true; | |
471 | } | |
472 | ||
473 | /* Implement INITIAL_ELIMINATION_OFFSET macro. */ | |
474 | int | |
475 | pru_initial_elimination_offset (int from, int to) | |
476 | { | |
477 | int offset; | |
478 | ||
479 | /* Set OFFSET to the offset from the stack pointer. */ | |
480 | switch (from) | |
481 | { | |
482 | case FRAME_POINTER_REGNUM: | |
483 | offset = cfun->machine->out_args_size; | |
484 | break; | |
485 | ||
486 | case ARG_POINTER_REGNUM: | |
487 | offset = cfun->machine->total_size; | |
488 | offset -= crtl->args.pretend_args_size; | |
489 | break; | |
490 | ||
491 | default: | |
492 | gcc_unreachable (); | |
493 | } | |
494 | ||
495 | /* If we are asked for the frame pointer offset, then adjust OFFSET | |
496 | by the offset from the frame pointer to the stack pointer. */ | |
497 | if (to == HARD_FRAME_POINTER_REGNUM) | |
498 | offset -= cfun->machine->total_size - crtl->args.pretend_args_size; | |
499 | ||
500 | ||
501 | return offset; | |
502 | } | |
503 | ||
504 | /* Return nonzero if this function is known to have a null epilogue. | |
505 | This allows the optimizer to omit jumps to jumps if no stack | |
506 | was created. */ | |
507 | int | |
508 | pru_can_use_return_insn (void) | |
509 | { | |
510 | if (!reload_completed || crtl->profile) | |
511 | return 0; | |
512 | ||
513 | return cfun->machine->total_size == 0; | |
514 | } | |
515 | \f | |
516 | /* Implement TARGET_HARD_REGNO_MODE_OK. */ | |
517 | ||
518 | static bool | |
519 | pru_hard_regno_mode_ok (unsigned int regno, machine_mode mode) | |
520 | { | |
521 | switch (GET_MODE_SIZE (mode)) | |
522 | { | |
523 | case 1: return true; | |
524 | case 2: return (regno % 4) <= 2; | |
525 | case 4: return (regno % 4) == 0; | |
526 | case 8: return (regno % 4) == 0; | |
527 | case 16: return (regno % 4) == 0; /* Not sure why TImode is used. */ | |
528 | case 32: return (regno % 4) == 0; /* Not sure why CTImode is used. */ | |
529 | default: | |
530 | /* TODO: Find out why VOIDmode and BLKmode are passed. */ | |
531 | gcc_assert (mode == BLKmode || mode == VOIDmode); | |
532 | return (regno % 4) == 0; | |
533 | } | |
534 | } | |
535 | ||
536 | /* Implement `TARGET_HARD_REGNO_SCRATCH_OK'. | |
537 | Returns true if REGNO is safe to be allocated as a scratch | |
538 | register (for a define_peephole2) in the current function. */ | |
539 | ||
540 | static bool | |
541 | pru_hard_regno_scratch_ok (unsigned int regno) | |
542 | { | |
543 | /* Don't allow hard registers that might be part of the frame pointer. | |
544 | Some places in the compiler just test for [HARD_]FRAME_POINTER_REGNUM | |
545 | and don't handle a frame pointer that spans more than one register. | |
546 | TODO: Fix those faulty places. */ | |
547 | ||
548 | if ((!reload_completed || frame_pointer_needed) | |
549 | && (IN_RANGE (regno, HARD_FRAME_POINTER_REGNUM, | |
550 | HARD_FRAME_POINTER_REGNUM + 3) | |
551 | || IN_RANGE (regno, FRAME_POINTER_REGNUM, | |
552 | FRAME_POINTER_REGNUM + 3))) | |
553 | return false; | |
554 | ||
555 | return true; | |
556 | } | |
557 | ||
558 | ||
559 | /* Implement TARGET_HARD_REGNO_CALL_PART_CLOBBERED. */ | |
560 | ||
561 | static bool | |
6ee2cc70 RS |
562 | pru_hard_regno_call_part_clobbered (unsigned, unsigned regno, |
563 | machine_mode mode) | |
8d2af3a2 DD |
564 | { |
565 | HARD_REG_SET caller_saved_set; | |
566 | HARD_REG_SET callee_saved_set; | |
567 | ||
568 | CLEAR_HARD_REG_SET (caller_saved_set); | |
569 | CLEAR_HARD_REG_SET (callee_saved_set); | |
570 | ||
571 | /* r0 and r1 are caller saved. */ | |
572 | add_range_to_hard_reg_set (&caller_saved_set, 0, 2 * 4); | |
573 | ||
574 | add_range_to_hard_reg_set (&caller_saved_set, FIRST_ARG_REGNUM, | |
575 | LAST_ARG_REGNUM + 1 - FIRST_ARG_REGNUM); | |
576 | ||
577 | /* Treat SP as callee saved. */ | |
578 | add_range_to_hard_reg_set (&callee_saved_set, STACK_POINTER_REGNUM, 4); | |
579 | ||
580 | /* r3 to r13 are callee saved. */ | |
581 | add_range_to_hard_reg_set (&callee_saved_set, FIRST_CALLEE_SAVED_REGNUM, | |
582 | LAST_CALEE_SAVED_REGNUM + 1 | |
583 | - FIRST_CALLEE_SAVED_REGNUM); | |
584 | ||
585 | return overlaps_hard_reg_set_p (caller_saved_set, mode, regno) | |
586 | && overlaps_hard_reg_set_p (callee_saved_set, mode, regno); | |
587 | } | |
588 | ||
589 | ||
590 | /* Worker function for `HARD_REGNO_RENAME_OK'. | |
591 | Return nonzero if register OLD_REG can be renamed to register NEW_REG. */ | |
592 | ||
593 | int | |
594 | pru_hard_regno_rename_ok (unsigned int old_reg, | |
595 | unsigned int new_reg) | |
596 | { | |
597 | /* Don't allow hard registers that might be part of the frame pointer. | |
598 | Some places in the compiler just test for [HARD_]FRAME_POINTER_REGNUM | |
599 | and don't care for a frame pointer that spans more than one register. | |
600 | TODO: Fix those faulty places. */ | |
601 | if ((!reload_completed || frame_pointer_needed) | |
602 | && (IN_RANGE (old_reg, HARD_FRAME_POINTER_REGNUM, | |
603 | HARD_FRAME_POINTER_REGNUM + 3) | |
604 | || IN_RANGE (old_reg, FRAME_POINTER_REGNUM, | |
605 | FRAME_POINTER_REGNUM + 3) | |
606 | || IN_RANGE (new_reg, HARD_FRAME_POINTER_REGNUM, | |
607 | HARD_FRAME_POINTER_REGNUM + 3) | |
608 | || IN_RANGE (new_reg, FRAME_POINTER_REGNUM, | |
609 | FRAME_POINTER_REGNUM + 3))) | |
610 | return 0; | |
611 | ||
612 | return 1; | |
613 | } | |
614 | \f | |
615 | /* Allocate a chunk of memory for per-function machine-dependent data. */ | |
616 | static struct machine_function * | |
617 | pru_init_machine_status (void) | |
618 | { | |
619 | return ggc_cleared_alloc<machine_function> (); | |
620 | } | |
621 | ||
622 | /* Implement TARGET_OPTION_OVERRIDE. */ | |
623 | static void | |
624 | pru_option_override (void) | |
625 | { | |
626 | #ifdef SUBTARGET_OVERRIDE_OPTIONS | |
627 | SUBTARGET_OVERRIDE_OPTIONS; | |
628 | #endif | |
629 | ||
630 | /* Check for unsupported options. */ | |
631 | if (flag_pic == 1) | |
632 | warning (OPT_fpic, "%<-fpic%> is not supported"); | |
633 | if (flag_pic == 2) | |
634 | warning (OPT_fPIC, "%<-fPIC%> is not supported"); | |
635 | if (flag_pie == 1) | |
636 | warning (OPT_fpie, "%<-fpie%> is not supported"); | |
637 | if (flag_pie == 2) | |
638 | warning (OPT_fPIE, "%<-fPIE%> is not supported"); | |
639 | ||
640 | /* QBxx conditional branching cannot cope with block reordering. */ | |
641 | if (flag_reorder_blocks_and_partition) | |
642 | { | |
643 | inform (input_location, "%<-freorder-blocks-and-partition%> " | |
644 | "not supported on this architecture"); | |
645 | flag_reorder_blocks_and_partition = 0; | |
646 | flag_reorder_blocks = 1; | |
647 | } | |
648 | ||
649 | /* Function to allocate machine-dependent function status. */ | |
650 | init_machine_status = &pru_init_machine_status; | |
651 | ||
652 | /* Save the initial options in case the user does function specific | |
653 | options. */ | |
654 | target_option_default_node = target_option_current_node | |
655 | = build_target_option_node (&global_options); | |
656 | ||
657 | /* Due to difficulties in implementing the TI ABI with GCC, | |
658 | at least check and error-out if GCC cannot compile a | |
659 | compliant output. */ | |
660 | pru_register_abicheck_pass (); | |
661 | } | |
662 | \f | |
663 | /* Compute a (partial) cost for rtx X. Return true if the complete | |
664 | cost has been computed, and false if subexpressions should be | |
665 | scanned. In either case, *TOTAL contains the cost result. */ | |
666 | static bool | |
667 | pru_rtx_costs (rtx x, machine_mode mode, | |
668 | int outer_code, int opno ATTRIBUTE_UNUSED, | |
669 | int *total, bool speed ATTRIBUTE_UNUSED) | |
670 | { | |
671 | const int code = GET_CODE (x); | |
672 | ||
673 | switch (code) | |
674 | { | |
675 | case CONST_INT: | |
676 | if ((mode == VOIDmode && UBYTE_INT (INTVAL (x))) | |
677 | || (mode != VOIDmode && const_ubyte_operand (x, mode))) | |
678 | { | |
679 | *total = COSTS_N_INSNS (0); | |
680 | return true; | |
681 | } | |
682 | else if ((mode == VOIDmode && UHWORD_INT (INTVAL (x))) | |
683 | || (mode != VOIDmode && const_uhword_operand (x, mode))) | |
684 | { | |
685 | *total = COSTS_N_INSNS (1); | |
686 | return true; | |
687 | } | |
688 | else if (outer_code == MEM && ctable_addr_operand (x, VOIDmode)) | |
689 | { | |
690 | *total = COSTS_N_INSNS (0); | |
691 | return true; | |
692 | } | |
693 | else | |
694 | { | |
695 | *total = COSTS_N_INSNS (2); | |
696 | return true; | |
697 | } | |
698 | ||
699 | case LABEL_REF: | |
700 | case SYMBOL_REF: | |
701 | case CONST: | |
702 | { | |
703 | *total = COSTS_N_INSNS (1); | |
704 | return true; | |
705 | } | |
706 | case CONST_DOUBLE: | |
707 | { | |
708 | *total = COSTS_N_INSNS (2); | |
709 | return true; | |
710 | } | |
711 | case CONST_WIDE_INT: | |
712 | { | |
713 | /* PRU declares no vector or very large integer types. */ | |
714 | gcc_unreachable (); | |
715 | return true; | |
716 | } | |
717 | case SET: | |
718 | { | |
719 | int factor; | |
720 | ||
721 | /* A SET doesn't have a mode, so let's look at the SET_DEST to get | |
722 | the mode for the factor. */ | |
723 | mode = GET_MODE (SET_DEST (x)); | |
724 | ||
725 | /* SI move has the same cost as a QI move. Moves larger than | |
726 | 64 bits are costly. */ | |
727 | factor = CEIL (GET_MODE_SIZE (mode), GET_MODE_SIZE (SImode)); | |
728 | *total = factor * COSTS_N_INSNS (1); | |
729 | ||
730 | return false; | |
731 | } | |
732 | ||
733 | case MULT: | |
734 | { | |
735 | /* Factor in that "mul" requires fixed registers, which | |
736 | would likely require register moves. */ | |
737 | *total = COSTS_N_INSNS (7); | |
738 | return false; | |
739 | } | |
740 | case PLUS: | |
741 | { | |
742 | rtx op0 = XEXP (x, 0); | |
743 | rtx op1 = XEXP (x, 1); | |
744 | machine_mode op1_mode = GET_MODE (op1); | |
745 | ||
746 | /* Generic RTL address expressions do not enforce mode for | |
747 | offsets, yet our UBYTE constraint requires it. Fix it here. */ | |
748 | if (op1_mode == VOIDmode && CONST_INT_P (op1) && outer_code == MEM) | |
749 | op1_mode = Pmode; | |
750 | if (outer_code == MEM | |
751 | && ((REG_P (op0) && reg_or_ubyte_operand (op1, op1_mode)) | |
752 | || ctable_addr_operand (op0, VOIDmode) | |
753 | || ctable_addr_operand (op1, VOIDmode) | |
754 | || (ctable_base_operand (op0, VOIDmode) && REG_P (op1)) | |
755 | || (ctable_base_operand (op1, VOIDmode) && REG_P (op0)))) | |
756 | { | |
757 | /* CTABLE or REG base addressing - PLUS comes for free. */ | |
758 | *total = COSTS_N_INSNS (0); | |
759 | return true; | |
760 | } | |
761 | else | |
762 | { | |
763 | *total = COSTS_N_INSNS (1); | |
764 | return false; | |
765 | } | |
766 | } | |
767 | case SIGN_EXTEND: | |
768 | { | |
769 | *total = COSTS_N_INSNS (3); | |
770 | return false; | |
771 | } | |
772 | case ASHIFTRT: | |
773 | { | |
774 | rtx op1 = XEXP (x, 1); | |
775 | if (const_1_operand (op1, VOIDmode)) | |
776 | *total = COSTS_N_INSNS (3); | |
777 | else | |
778 | *total = COSTS_N_INSNS (7); | |
779 | return false; | |
780 | } | |
781 | case ZERO_EXTRACT: | |
782 | { | |
783 | rtx op2 = XEXP (x, 2); | |
784 | if ((outer_code == EQ || outer_code == NE) | |
785 | && CONST_INT_P (op2) | |
786 | && INTVAL (op2) == 1) | |
787 | { | |
788 | /* Branch if bit is set/clear is a single instruction. */ | |
789 | *total = COSTS_N_INSNS (0); | |
790 | return true; | |
791 | } | |
792 | else | |
793 | { | |
794 | *total = COSTS_N_INSNS (2); | |
795 | return false; | |
796 | } | |
797 | } | |
798 | case ZERO_EXTEND: | |
799 | { | |
800 | *total = COSTS_N_INSNS (0); | |
801 | return false; | |
802 | } | |
803 | ||
804 | default: | |
805 | { | |
806 | /* PRU ALU is 32 bit, despite GCC's UNITS_PER_WORD=1. */ | |
807 | int factor = CEIL (GET_MODE_SIZE (mode), GET_MODE_SIZE (SImode)); | |
808 | *total = factor * COSTS_N_INSNS (1); | |
809 | return false; | |
810 | } | |
811 | } | |
812 | } | |
813 | \f | |
814 | static GTY(()) rtx eqdf_libfunc; | |
815 | static GTY(()) rtx nedf_libfunc; | |
816 | static GTY(()) rtx ledf_libfunc; | |
817 | static GTY(()) rtx ltdf_libfunc; | |
818 | static GTY(()) rtx gedf_libfunc; | |
819 | static GTY(()) rtx gtdf_libfunc; | |
820 | static GTY(()) rtx eqsf_libfunc; | |
821 | static GTY(()) rtx nesf_libfunc; | |
822 | static GTY(()) rtx lesf_libfunc; | |
823 | static GTY(()) rtx ltsf_libfunc; | |
824 | static GTY(()) rtx gesf_libfunc; | |
825 | static GTY(()) rtx gtsf_libfunc; | |
826 | ||
827 | /* Implement the TARGET_INIT_LIBFUNCS macro. We use this to rename library | |
828 | functions to match the PRU ABI. */ | |
829 | ||
830 | static void | |
831 | pru_init_libfuncs (void) | |
832 | { | |
833 | /* Double-precision floating-point arithmetic. */ | |
834 | set_optab_libfunc (add_optab, DFmode, "__pruabi_addd"); | |
835 | set_optab_libfunc (sdiv_optab, DFmode, "__pruabi_divd"); | |
836 | set_optab_libfunc (smul_optab, DFmode, "__pruabi_mpyd"); | |
837 | set_optab_libfunc (neg_optab, DFmode, "__pruabi_negd"); | |
838 | set_optab_libfunc (sub_optab, DFmode, "__pruabi_subd"); | |
839 | ||
840 | /* Single-precision floating-point arithmetic. */ | |
841 | set_optab_libfunc (add_optab, SFmode, "__pruabi_addf"); | |
842 | set_optab_libfunc (sdiv_optab, SFmode, "__pruabi_divf"); | |
843 | set_optab_libfunc (smul_optab, SFmode, "__pruabi_mpyf"); | |
844 | set_optab_libfunc (neg_optab, SFmode, "__pruabi_negf"); | |
845 | set_optab_libfunc (sub_optab, SFmode, "__pruabi_subf"); | |
846 | ||
847 | /* Floating-point comparisons. */ | |
848 | eqsf_libfunc = init_one_libfunc ("__pruabi_eqf"); | |
849 | nesf_libfunc = init_one_libfunc ("__pruabi_neqf"); | |
850 | lesf_libfunc = init_one_libfunc ("__pruabi_lef"); | |
851 | ltsf_libfunc = init_one_libfunc ("__pruabi_ltf"); | |
852 | gesf_libfunc = init_one_libfunc ("__pruabi_gef"); | |
853 | gtsf_libfunc = init_one_libfunc ("__pruabi_gtf"); | |
854 | eqdf_libfunc = init_one_libfunc ("__pruabi_eqd"); | |
855 | nedf_libfunc = init_one_libfunc ("__pruabi_neqd"); | |
856 | ledf_libfunc = init_one_libfunc ("__pruabi_led"); | |
857 | ltdf_libfunc = init_one_libfunc ("__pruabi_ltd"); | |
858 | gedf_libfunc = init_one_libfunc ("__pruabi_ged"); | |
859 | gtdf_libfunc = init_one_libfunc ("__pruabi_gtd"); | |
860 | ||
861 | /* In PRU ABI, much like other TI processors, floating point | |
862 | comparisons return non-standard values. This quirk is handled | |
863 | by disabling the optab library functions, and handling the | |
864 | comparison during RTL expansion. */ | |
865 | set_optab_libfunc (eq_optab, SFmode, NULL); | |
866 | set_optab_libfunc (ne_optab, SFmode, NULL); | |
867 | set_optab_libfunc (gt_optab, SFmode, NULL); | |
868 | set_optab_libfunc (ge_optab, SFmode, NULL); | |
869 | set_optab_libfunc (lt_optab, SFmode, NULL); | |
870 | set_optab_libfunc (le_optab, SFmode, NULL); | |
871 | set_optab_libfunc (eq_optab, DFmode, NULL); | |
872 | set_optab_libfunc (ne_optab, DFmode, NULL); | |
873 | set_optab_libfunc (gt_optab, DFmode, NULL); | |
874 | set_optab_libfunc (ge_optab, DFmode, NULL); | |
875 | set_optab_libfunc (lt_optab, DFmode, NULL); | |
876 | set_optab_libfunc (le_optab, DFmode, NULL); | |
877 | ||
878 | /* The isunordered function appears to be supported only by GCC. */ | |
879 | set_optab_libfunc (unord_optab, SFmode, "__pruabi_unordf"); | |
880 | set_optab_libfunc (unord_optab, DFmode, "__pruabi_unordd"); | |
881 | ||
882 | /* Floating-point to integer conversions. */ | |
883 | set_conv_libfunc (sfix_optab, SImode, DFmode, "__pruabi_fixdi"); | |
884 | set_conv_libfunc (ufix_optab, SImode, DFmode, "__pruabi_fixdu"); | |
885 | set_conv_libfunc (sfix_optab, DImode, DFmode, "__pruabi_fixdlli"); | |
886 | set_conv_libfunc (ufix_optab, DImode, DFmode, "__pruabi_fixdull"); | |
887 | set_conv_libfunc (sfix_optab, SImode, SFmode, "__pruabi_fixfi"); | |
888 | set_conv_libfunc (ufix_optab, SImode, SFmode, "__pruabi_fixfu"); | |
889 | set_conv_libfunc (sfix_optab, DImode, SFmode, "__pruabi_fixflli"); | |
890 | set_conv_libfunc (ufix_optab, DImode, SFmode, "__pruabi_fixfull"); | |
891 | ||
892 | /* Conversions between floating types. */ | |
893 | set_conv_libfunc (trunc_optab, SFmode, DFmode, "__pruabi_cvtdf"); | |
894 | set_conv_libfunc (sext_optab, DFmode, SFmode, "__pruabi_cvtfd"); | |
895 | ||
896 | /* Integer to floating-point conversions. */ | |
897 | set_conv_libfunc (sfloat_optab, DFmode, SImode, "__pruabi_fltid"); | |
898 | set_conv_libfunc (ufloat_optab, DFmode, SImode, "__pruabi_fltud"); | |
899 | set_conv_libfunc (sfloat_optab, DFmode, DImode, "__pruabi_fltllid"); | |
900 | set_conv_libfunc (ufloat_optab, DFmode, DImode, "__pruabi_fltulld"); | |
901 | set_conv_libfunc (sfloat_optab, SFmode, SImode, "__pruabi_fltif"); | |
902 | set_conv_libfunc (ufloat_optab, SFmode, SImode, "__pruabi_fltuf"); | |
903 | set_conv_libfunc (sfloat_optab, SFmode, DImode, "__pruabi_fltllif"); | |
904 | set_conv_libfunc (ufloat_optab, SFmode, DImode, "__pruabi_fltullf"); | |
905 | ||
906 | /* Long long. */ | |
907 | set_optab_libfunc (ashr_optab, DImode, "__pruabi_asrll"); | |
908 | set_optab_libfunc (smul_optab, DImode, "__pruabi_mpyll"); | |
909 | set_optab_libfunc (ashl_optab, DImode, "__pruabi_lslll"); | |
910 | set_optab_libfunc (lshr_optab, DImode, "__pruabi_lsrll"); | |
911 | ||
912 | set_optab_libfunc (sdiv_optab, SImode, "__pruabi_divi"); | |
913 | set_optab_libfunc (udiv_optab, SImode, "__pruabi_divu"); | |
914 | set_optab_libfunc (smod_optab, SImode, "__pruabi_remi"); | |
915 | set_optab_libfunc (umod_optab, SImode, "__pruabi_remu"); | |
916 | set_optab_libfunc (sdivmod_optab, SImode, "__pruabi_divremi"); | |
917 | set_optab_libfunc (udivmod_optab, SImode, "__pruabi_divremu"); | |
918 | set_optab_libfunc (sdiv_optab, DImode, "__pruabi_divlli"); | |
919 | set_optab_libfunc (udiv_optab, DImode, "__pruabi_divull"); | |
920 | set_optab_libfunc (smod_optab, DImode, "__pruabi_remlli"); | |
921 | set_optab_libfunc (umod_optab, DImode, "__pruabi_remull"); | |
922 | set_optab_libfunc (udivmod_optab, DImode, "__pruabi_divremull"); | |
923 | } | |
924 | ||
925 | ||
926 | /* Emit comparison instruction if necessary, returning the expression | |
927 | that holds the compare result in the proper mode. Return the comparison | |
928 | that should be used in the jump insn. */ | |
929 | ||
930 | rtx | |
931 | pru_expand_fp_compare (rtx comparison, machine_mode mode) | |
932 | { | |
933 | enum rtx_code code = GET_CODE (comparison); | |
934 | rtx op0 = XEXP (comparison, 0); | |
935 | rtx op1 = XEXP (comparison, 1); | |
936 | rtx cmp; | |
937 | enum rtx_code jump_code = code; | |
938 | machine_mode op_mode = GET_MODE (op0); | |
939 | rtx_insn *insns; | |
940 | rtx libfunc; | |
941 | ||
942 | gcc_assert (op_mode == DFmode || op_mode == SFmode); | |
943 | ||
944 | /* FP exceptions are not raised by PRU's softfp implementation. So the | |
945 | following transformations are safe. */ | |
946 | if (code == UNGE) | |
947 | { | |
948 | code = LT; | |
949 | jump_code = EQ; | |
950 | } | |
951 | else if (code == UNLE) | |
952 | { | |
953 | code = GT; | |
954 | jump_code = EQ; | |
955 | } | |
956 | else | |
957 | jump_code = NE; | |
958 | ||
959 | switch (code) | |
960 | { | |
961 | case EQ: | |
962 | libfunc = op_mode == DFmode ? eqdf_libfunc : eqsf_libfunc; | |
963 | break; | |
964 | case NE: | |
965 | libfunc = op_mode == DFmode ? nedf_libfunc : nesf_libfunc; | |
966 | break; | |
967 | case GT: | |
968 | libfunc = op_mode == DFmode ? gtdf_libfunc : gtsf_libfunc; | |
969 | break; | |
970 | case GE: | |
971 | libfunc = op_mode == DFmode ? gedf_libfunc : gesf_libfunc; | |
972 | break; | |
973 | case LT: | |
974 | libfunc = op_mode == DFmode ? ltdf_libfunc : ltsf_libfunc; | |
975 | break; | |
976 | case LE: | |
977 | libfunc = op_mode == DFmode ? ledf_libfunc : lesf_libfunc; | |
978 | break; | |
979 | default: | |
980 | gcc_unreachable (); | |
981 | } | |
982 | start_sequence (); | |
983 | ||
984 | cmp = emit_library_call_value (libfunc, 0, LCT_CONST, SImode, | |
985 | op0, op_mode, op1, op_mode); | |
986 | insns = get_insns (); | |
987 | end_sequence (); | |
988 | ||
989 | emit_libcall_block (insns, cmp, cmp, | |
990 | gen_rtx_fmt_ee (code, SImode, op0, op1)); | |
991 | ||
992 | return gen_rtx_fmt_ee (jump_code, mode, cmp, const0_rtx); | |
993 | } | |
994 | \f | |
995 | /* Return the sign bit position for given OP's mode. */ | |
996 | static int | |
997 | sign_bit_position (const rtx op) | |
998 | { | |
999 | const int sz = GET_MODE_SIZE (GET_MODE (op)); | |
1000 | ||
1001 | return sz * 8 - 1; | |
1002 | } | |
1003 | ||
1004 | /* Output asm code for sign_extend operation. */ | |
1005 | const char * | |
1006 | pru_output_sign_extend (rtx *operands) | |
1007 | { | |
1008 | static char buf[512]; | |
1009 | int bufi; | |
1010 | const int dst_sz = GET_MODE_SIZE (GET_MODE (operands[0])); | |
1011 | const int src_sz = GET_MODE_SIZE (GET_MODE (operands[1])); | |
1012 | char ext_start; | |
1013 | ||
1014 | switch (src_sz) | |
1015 | { | |
1016 | case 1: ext_start = 'y'; break; | |
1017 | case 2: ext_start = 'z'; break; | |
1018 | default: gcc_unreachable (); | |
1019 | } | |
1020 | ||
1021 | gcc_assert (dst_sz > src_sz); | |
1022 | ||
1023 | /* Note that src and dst can be different parts of the same | |
1024 | register, e.g. "r7, r7.w1". */ | |
1025 | bufi = snprintf (buf, sizeof (buf), | |
1026 | "mov\t%%0, %%1\n\t" /* Copy AND make positive. */ | |
1027 | "qbbc\t.+8, %%0, %d\n\t" /* Check sign bit. */ | |
1028 | "fill\t%%%c0, %d", /* Make negative. */ | |
1029 | sign_bit_position (operands[1]), | |
1030 | ext_start, | |
1031 | dst_sz - src_sz); | |
1032 | ||
1033 | gcc_assert (bufi > 0); | |
1034 | gcc_assert ((unsigned int) bufi < sizeof (buf)); | |
1035 | ||
1036 | return buf; | |
1037 | } | |
1038 | \f | |
1039 | /* Branches and compares. */ | |
1040 | ||
1041 | /* PRU's ALU does not support signed comparison operations. That's why we | |
1042 | emulate them. By first checking the sign bit and handling every possible | |
1043 | operand sign combination, we can simulate signed comparisons in just | |
1044 | 5 instructions. See table below. | |
1045 | ||
1046 | .-------------------.---------------------------------------------------. | |
1047 | | Operand sign bit | Mapping the signed comparison to an unsigned one | | |
1048 | |---------+---------+------------+------------+------------+------------| | |
1049 | | OP1.b31 | OP2.b31 | OP1 < OP2 | OP1 <= OP2 | OP1 > OP2 | OP1 >= OP2 | | |
1050 | |---------+---------+------------+------------+------------+------------| | |
1051 | | 0 | 0 | OP1 < OP2 | OP1 <= OP2 | OP1 > OP2 | OP1 >= OP2 | | |
1052 | |---------+---------+------------+------------+------------+------------| | |
1053 | | 0 | 1 | false | false | true | true | | |
1054 | |---------+---------+------------+------------+------------+------------| | |
1055 | | 1 | 0 | true | true | false | false | | |
1056 | |---------+---------+------------+------------+------------+------------| | |
1057 | | 1 | 1 | OP1 < OP2 | OP1 <= OP2 | OP1 > OP2 | OP1 >= OP2 | | |
1058 | `---------'---------'------------'------------'------------+------------' | |
1059 | ||
1060 | ||
1061 | Given the table above, here is an example for a concrete op: | |
1062 | LT: | |
1063 | qbbc OP1_POS, OP1, 31 | |
1064 | OP1_NEG: qbbc BRANCH_TAKEN_LABEL, OP2, 31 | |
1065 | OP1_NEG_OP2_NEG: qblt BRANCH_TAKEN_LABEL, OP2, OP1 | |
1066 | ; jmp OUT -> can be eliminated because we'll take the | |
1067 | ; following branch. OP2.b31 is guaranteed to be 1 | |
1068 | ; by the time we get here. | |
1069 | OP1_POS: qbbs OUT, OP2, 31 | |
1070 | OP1_POS_OP2_POS: qblt BRANCH_TAKEN_LABEL, OP2, OP1 | |
1071 | #if FAR_JUMP | |
1072 | jmp OUT | |
1073 | BRANCH_TAKEN_LABEL: jmp REAL_BRANCH_TAKEN_LABEL | |
1074 | #endif | |
1075 | OUT: | |
1076 | ||
1077 | */ | |
1078 | ||
1079 | /* Output asm code for a signed-compare LT/LE conditional branch. */ | |
1080 | static const char * | |
1081 | pru_output_ltle_signed_cbranch (rtx *operands, bool is_near) | |
1082 | { | |
1083 | static char buf[1024]; | |
1084 | enum rtx_code code = GET_CODE (operands[0]); | |
1085 | rtx op1; | |
1086 | rtx op2; | |
1087 | const char *cmp_opstr; | |
1088 | int bufi = 0; | |
1089 | ||
1090 | op1 = operands[1]; | |
1091 | op2 = operands[2]; | |
1092 | ||
1093 | gcc_assert (GET_CODE (op1) == REG && GET_CODE (op2) == REG); | |
1094 | ||
1095 | /* Determine the comparison operators for positive and negative operands. */ | |
1096 | if (code == LT) | |
1097 | cmp_opstr = "qblt"; | |
1098 | else if (code == LE) | |
1099 | cmp_opstr = "qble"; | |
1100 | else | |
1101 | gcc_unreachable (); | |
1102 | ||
1103 | if (is_near) | |
1104 | bufi = snprintf (buf, sizeof (buf), | |
1105 | "qbbc\t.+12, %%1, %d\n\t" | |
1106 | "qbbc\t%%l3, %%2, %d\n\t" /* OP1_NEG. */ | |
1107 | "%s\t%%l3, %%2, %%1\n\t" /* OP1_NEG_OP2_NEG. */ | |
1108 | "qbbs\t.+8, %%2, %d\n\t" /* OP1_POS. */ | |
1109 | "%s\t%%l3, %%2, %%1", /* OP1_POS_OP2_POS. */ | |
1110 | sign_bit_position (op1), | |
1111 | sign_bit_position (op2), | |
1112 | cmp_opstr, | |
1113 | sign_bit_position (op2), | |
1114 | cmp_opstr); | |
1115 | else | |
1116 | bufi = snprintf (buf, sizeof (buf), | |
1117 | "qbbc\t.+12, %%1, %d\n\t" | |
1118 | "qbbc\t.+20, %%2, %d\n\t" /* OP1_NEG. */ | |
1119 | "%s\t.+16, %%2, %%1\n\t" /* OP1_NEG_OP2_NEG. */ | |
1120 | "qbbs\t.+16, %%2, %d\n\t" /* OP1_POS. */ | |
1121 | "%s\t.+8, %%2, %%1\n\t" /* OP1_POS_OP2_POS. */ | |
1122 | "jmp\t.+8\n\t" /* jmp OUT. */ | |
1123 | "jmp\t%%%%label(%%l3)", /* BRANCH_TAKEN_LABEL. */ | |
1124 | sign_bit_position (op1), | |
1125 | sign_bit_position (op2), | |
1126 | cmp_opstr, | |
1127 | sign_bit_position (op2), | |
1128 | cmp_opstr); | |
1129 | ||
1130 | gcc_assert (bufi > 0); | |
1131 | gcc_assert ((unsigned int) bufi < sizeof (buf)); | |
1132 | ||
1133 | return buf; | |
1134 | } | |
1135 | ||
1136 | /* Output asm code for a signed-compare GT/GE conditional branch. */ | |
1137 | static const char * | |
1138 | pru_output_gtge_signed_cbranch (rtx *operands, bool is_near) | |
1139 | { | |
1140 | static char buf[1024]; | |
1141 | enum rtx_code code = GET_CODE (operands[0]); | |
1142 | rtx op1; | |
1143 | rtx op2; | |
1144 | const char *cmp_opstr; | |
1145 | int bufi = 0; | |
1146 | ||
1147 | op1 = operands[1]; | |
1148 | op2 = operands[2]; | |
1149 | ||
1150 | gcc_assert (GET_CODE (op1) == REG && GET_CODE (op2) == REG); | |
1151 | ||
1152 | /* Determine the comparison operators for positive and negative operands. */ | |
1153 | if (code == GT) | |
1154 | cmp_opstr = "qbgt"; | |
1155 | else if (code == GE) | |
1156 | cmp_opstr = "qbge"; | |
1157 | else | |
1158 | gcc_unreachable (); | |
1159 | ||
1160 | if (is_near) | |
1161 | bufi = snprintf (buf, sizeof (buf), | |
1162 | "qbbs\t.+12, %%1, %d\n\t" | |
1163 | "qbbs\t%%l3, %%2, %d\n\t" /* OP1_POS. */ | |
1164 | "%s\t%%l3, %%2, %%1\n\t" /* OP1_POS_OP2_POS. */ | |
1165 | "qbbc\t.+8, %%2, %d\n\t" /* OP1_NEG. */ | |
1166 | "%s\t%%l3, %%2, %%1", /* OP1_NEG_OP2_NEG. */ | |
1167 | sign_bit_position (op1), | |
1168 | sign_bit_position (op2), | |
1169 | cmp_opstr, | |
1170 | sign_bit_position (op2), | |
1171 | cmp_opstr); | |
1172 | else | |
1173 | bufi = snprintf (buf, sizeof (buf), | |
1174 | "qbbs\t.+12, %%1, %d\n\t" | |
1175 | "qbbs\t.+20, %%2, %d\n\t" /* OP1_POS. */ | |
1176 | "%s\t.+16, %%2, %%1\n\t" /* OP1_POS_OP2_POS. */ | |
1177 | "qbbc\t.+16, %%2, %d\n\t" /* OP1_NEG. */ | |
1178 | "%s\t.+8, %%2, %%1\n\t" /* OP1_NEG_OP2_NEG. */ | |
1179 | "jmp\t.+8\n\t" /* jmp OUT. */ | |
1180 | "jmp\t%%%%label(%%l3)", /* BRANCH_TAKEN_LABEL. */ | |
1181 | sign_bit_position (op1), | |
1182 | sign_bit_position (op2), | |
1183 | cmp_opstr, | |
1184 | sign_bit_position (op2), | |
1185 | cmp_opstr); | |
1186 | ||
1187 | gcc_assert (bufi > 0); | |
1188 | gcc_assert ((unsigned int) bufi < sizeof (buf)); | |
1189 | ||
1190 | return buf; | |
1191 | } | |
1192 | ||
1193 | /* Output asm code for a signed-compare conditional branch. | |
1194 | ||
1195 | If IS_NEAR is true, then QBBx instructions may be used for reaching | |
1196 | the destination label. Otherwise JMP is used, at the expense of | |
1197 | increased code size. */ | |
1198 | const char * | |
1199 | pru_output_signed_cbranch (rtx *operands, bool is_near) | |
1200 | { | |
1201 | enum rtx_code code = GET_CODE (operands[0]); | |
1202 | ||
1203 | if (code == LT || code == LE) | |
1204 | return pru_output_ltle_signed_cbranch (operands, is_near); | |
1205 | else if (code == GT || code == GE) | |
1206 | return pru_output_gtge_signed_cbranch (operands, is_near); | |
1207 | else | |
1208 | gcc_unreachable (); | |
1209 | } | |
1210 | ||
1211 | /* Optimized version of pru_output_signed_cbranch for constant second | |
1212 | operand. */ | |
1213 | ||
1214 | const char * | |
1215 | pru_output_signed_cbranch_ubyteop2 (rtx *operands, bool is_near) | |
1216 | { | |
1217 | static char buf[1024]; | |
1218 | enum rtx_code code = GET_CODE (operands[0]); | |
1219 | int regop_sign_bit_pos = sign_bit_position (operands[1]); | |
1220 | const char *cmp_opstr; | |
1221 | const char *rcmp_opstr; | |
1222 | ||
1223 | /* We must swap operands due to PRU's demand OP1 to be the immediate. */ | |
1224 | code = swap_condition (code); | |
1225 | ||
1226 | /* Determine normal and reversed comparison operators for both positive | |
1227 | operands. This enables us to go completely unsigned. | |
1228 | ||
1229 | NOTE: We cannot use the R print modifier because we convert signed | |
1230 | comparison operators to unsigned ones. */ | |
1231 | switch (code) | |
1232 | { | |
1233 | case LT: cmp_opstr = "qblt"; rcmp_opstr = "qbge"; break; | |
1234 | case LE: cmp_opstr = "qble"; rcmp_opstr = "qbgt"; break; | |
1235 | case GT: cmp_opstr = "qbgt"; rcmp_opstr = "qble"; break; | |
1236 | case GE: cmp_opstr = "qbge"; rcmp_opstr = "qblt"; break; | |
1237 | default: gcc_unreachable (); | |
1238 | } | |
1239 | ||
1240 | /* OP2 is a constant unsigned byte - utilize this info to generate | |
1241 | optimized code. We can "remove half" of the op table above because | |
1242 | we know that OP2.b31 = 0 (remember that 0 <= OP2 <= 255). */ | |
1243 | if (code == LT || code == LE) | |
1244 | { | |
1245 | if (is_near) | |
1246 | snprintf (buf, sizeof (buf), | |
1247 | "qbbs\t.+8, %%1, %d\n\t" | |
1248 | "%s\t%%l3, %%1, %%u2", | |
1249 | regop_sign_bit_pos, | |
1250 | cmp_opstr); | |
1251 | else | |
1252 | snprintf (buf, sizeof (buf), | |
1253 | "qbbs\t.+12, %%1, %d\n\t" | |
1254 | "%s\t.+8, %%1, %%u2\n\t" | |
1255 | "jmp\t%%%%label(%%l3)", | |
1256 | regop_sign_bit_pos, | |
1257 | rcmp_opstr); | |
1258 | } | |
1259 | else if (code == GT || code == GE) | |
1260 | { | |
1261 | if (is_near) | |
1262 | snprintf (buf, sizeof (buf), | |
1263 | "qbbs\t%%l3, %%1, %d\n\t" | |
1264 | "%s\t%%l3, %%1, %%u2", | |
1265 | regop_sign_bit_pos, | |
1266 | cmp_opstr); | |
1267 | else | |
1268 | snprintf (buf, sizeof (buf), | |
1269 | "qbbs\t.+8, %%1, %d\n\t" | |
1270 | "%s\t.+8, %%1, %%u2\n\t" | |
1271 | "jmp\t%%%%label(%%l3)", | |
1272 | regop_sign_bit_pos, | |
1273 | rcmp_opstr); | |
1274 | } | |
1275 | else | |
1276 | gcc_unreachable (); | |
1277 | ||
1278 | return buf; | |
1279 | } | |
1280 | ||
1281 | /* Optimized version of pru_output_signed_cbranch_ubyteop2 for constant | |
1282 | zero second operand. */ | |
1283 | ||
1284 | const char * | |
1285 | pru_output_signed_cbranch_zeroop2 (rtx *operands, bool is_near) | |
1286 | { | |
1287 | static char buf[1024]; | |
1288 | enum rtx_code code = GET_CODE (operands[0]); | |
1289 | int regop_sign_bit_pos = sign_bit_position (operands[1]); | |
1290 | ||
1291 | /* OP2 is a constant zero - utilize this info to simply check the | |
1292 | OP1 sign bit when comparing for LT or GE. */ | |
1293 | if (code == LT) | |
1294 | { | |
1295 | if (is_near) | |
1296 | snprintf (buf, sizeof (buf), | |
1297 | "qbbs\t%%l3, %%1, %d\n\t", | |
1298 | regop_sign_bit_pos); | |
1299 | else | |
1300 | snprintf (buf, sizeof (buf), | |
1301 | "qbbc\t.+8, %%1, %d\n\t" | |
1302 | "jmp\t%%%%label(%%l3)", | |
1303 | regop_sign_bit_pos); | |
1304 | } | |
1305 | else if (code == GE) | |
1306 | { | |
1307 | if (is_near) | |
1308 | snprintf (buf, sizeof (buf), | |
1309 | "qbbc\t%%l3, %%1, %d\n\t", | |
1310 | regop_sign_bit_pos); | |
1311 | else | |
1312 | snprintf (buf, sizeof (buf), | |
1313 | "qbbs\t.+8, %%1, %d\n\t" | |
1314 | "jmp\t%%%%label(%%l3)", | |
1315 | regop_sign_bit_pos); | |
1316 | } | |
1317 | else | |
1318 | gcc_unreachable (); | |
1319 | ||
1320 | return buf; | |
1321 | } | |
1322 | ||
1323 | /* Addressing Modes. */ | |
1324 | ||
1325 | /* Return true if register REGNO is a valid base register. | |
1326 | STRICT_P is true if REG_OK_STRICT is in effect. */ | |
1327 | ||
1328 | bool | |
1329 | pru_regno_ok_for_base_p (int regno, bool strict_p) | |
1330 | { | |
1331 | if (!HARD_REGISTER_NUM_P (regno) && !strict_p) | |
1332 | return true; | |
1333 | ||
1334 | /* The fake registers will be eliminated to either the stack or | |
1335 | hard frame pointer, both of which are usually valid base registers. | |
1336 | Reload deals with the cases where the eliminated form isn't valid. */ | |
1337 | return (GP_REG_P (regno) | |
1338 | || regno == FRAME_POINTER_REGNUM | |
1339 | || regno == ARG_POINTER_REGNUM); | |
1340 | } | |
1341 | ||
1342 | /* Return true if given xbbo constant OFFSET is valid. */ | |
1343 | static bool | |
1344 | pru_valid_const_ubyte_offset (machine_mode mode, HOST_WIDE_INT offset) | |
1345 | { | |
1346 | bool valid = UBYTE_INT (offset); | |
1347 | ||
1348 | /* Reload can split multi word accesses, so make sure we can address | |
1349 | the second word in a DI. */ | |
1350 | if (valid && GET_MODE_SIZE (mode) > GET_MODE_SIZE (SImode)) | |
1351 | valid = UBYTE_INT (offset + GET_MODE_SIZE (mode) - 1); | |
1352 | ||
1353 | return valid; | |
1354 | } | |
1355 | ||
1356 | /* Recognize a CTABLE base address. Return CTABLE entry index, or -1 if | |
1357 | base was not found in the pragma-filled pru_ctable. */ | |
1358 | int | |
1359 | pru_get_ctable_exact_base_index (unsigned HOST_WIDE_INT caddr) | |
1360 | { | |
1361 | unsigned int i; | |
1362 | ||
1363 | for (i = 0; i < ARRAY_SIZE (pru_ctable); i++) | |
1364 | { | |
1365 | if (pru_ctable[i].valid && pru_ctable[i].base == caddr) | |
1366 | return i; | |
1367 | } | |
1368 | return -1; | |
1369 | } | |
1370 | ||
1371 | ||
1372 | /* Check if the given address can be addressed via CTABLE_BASE + UBYTE_OFFS, | |
1373 | and return the base CTABLE index if possible. */ | |
1374 | int | |
1375 | pru_get_ctable_base_index (unsigned HOST_WIDE_INT caddr) | |
1376 | { | |
1377 | unsigned int i; | |
1378 | ||
1379 | for (i = 0; i < ARRAY_SIZE (pru_ctable); i++) | |
1380 | { | |
1381 | if (pru_ctable[i].valid && IN_RANGE (caddr, | |
1382 | pru_ctable[i].base, | |
1383 | pru_ctable[i].base + 0xff)) | |
1384 | return i; | |
1385 | } | |
1386 | return -1; | |
1387 | } | |
1388 | ||
1389 | ||
1390 | /* Return the offset from some CTABLE base for this address. */ | |
1391 | int | |
1392 | pru_get_ctable_base_offset (unsigned HOST_WIDE_INT caddr) | |
1393 | { | |
1394 | int i; | |
1395 | ||
1396 | i = pru_get_ctable_base_index (caddr); | |
1397 | gcc_assert (i >= 0); | |
1398 | ||
1399 | return caddr - pru_ctable[i].base; | |
1400 | } | |
1401 | ||
1402 | /* Return true if the address expression formed by BASE + OFFSET is | |
1403 | valid. | |
1404 | ||
1405 | Note that the following address is not handled here: | |
1406 | base CTABLE constant base + UBYTE constant offset | |
1407 | The constants will be folded. The ctable_addr_operand predicate will take | |
1408 | care of the validation. The CTABLE base+offset split will happen during | |
1409 | operand printing. */ | |
1410 | static bool | |
1411 | pru_valid_addr_expr_p (machine_mode mode, rtx base, rtx offset, bool strict_p) | |
1412 | { | |
1413 | if (!strict_p && GET_CODE (base) == SUBREG) | |
1414 | base = SUBREG_REG (base); | |
1415 | if (!strict_p && GET_CODE (offset) == SUBREG) | |
1416 | offset = SUBREG_REG (offset); | |
1417 | ||
1418 | if (REG_P (base) | |
1419 | && pru_regno_ok_for_base_p (REGNO (base), strict_p) | |
1420 | && ((CONST_INT_P (offset) | |
1421 | && pru_valid_const_ubyte_offset (mode, INTVAL (offset))) | |
1422 | || (REG_P (offset) | |
1423 | && pru_regno_ok_for_index_p (REGNO (offset), strict_p)))) | |
1424 | /* base register + register offset | |
1425 | * OR base register + UBYTE constant offset. */ | |
1426 | return true; | |
1427 | else if (REG_P (base) | |
1428 | && pru_regno_ok_for_index_p (REGNO (base), strict_p) | |
1429 | && ctable_base_operand (offset, VOIDmode)) | |
1430 | /* base CTABLE constant base + register offset | |
1431 | * Note: GCC always puts the register as a first operand of PLUS. */ | |
1432 | return true; | |
1433 | else | |
1434 | return false; | |
1435 | } | |
1436 | ||
1437 | /* Implement TARGET_LEGITIMATE_ADDRESS_P. */ | |
1438 | static bool | |
1439 | pru_legitimate_address_p (machine_mode mode, | |
1440 | rtx operand, bool strict_p) | |
1441 | { | |
1442 | switch (GET_CODE (operand)) | |
1443 | { | |
1444 | /* Direct. */ | |
1445 | case SYMBOL_REF: | |
1446 | case LABEL_REF: | |
1447 | case CONST: | |
1448 | case CONST_WIDE_INT: | |
1449 | return false; | |
1450 | ||
1451 | case CONST_INT: | |
1452 | return ctable_addr_operand (operand, VOIDmode); | |
1453 | ||
1454 | /* Register indirect. */ | |
1455 | case REG: | |
1456 | return pru_regno_ok_for_base_p (REGNO (operand), strict_p); | |
1457 | ||
1458 | /* Register indirect with displacement. */ | |
1459 | case PLUS: | |
1460 | { | |
1461 | rtx op0 = XEXP (operand, 0); | |
1462 | rtx op1 = XEXP (operand, 1); | |
1463 | ||
1464 | return pru_valid_addr_expr_p (mode, op0, op1, strict_p); | |
1465 | } | |
1466 | ||
1467 | default: | |
1468 | break; | |
1469 | } | |
1470 | return false; | |
1471 | } | |
1472 | \f | |
1473 | /* Output assembly language related definitions. */ | |
1474 | ||
1475 | /* Implement TARGET_ASM_CONSTRUCTOR. */ | |
1476 | static void | |
1477 | pru_elf_asm_constructor (rtx symbol, int priority) | |
1478 | { | |
1479 | char buf[23]; | |
1480 | section *s; | |
1481 | ||
1482 | if (priority == DEFAULT_INIT_PRIORITY) | |
1483 | snprintf (buf, sizeof (buf), ".init_array"); | |
1484 | else | |
1485 | { | |
1486 | /* While priority is known to be in range [0, 65535], so 18 bytes | |
1487 | would be enough, the compiler might not know that. To avoid | |
1488 | -Wformat-truncation false positive, use a larger size. */ | |
1489 | snprintf (buf, sizeof (buf), ".init_array.%.5u", priority); | |
1490 | } | |
1491 | s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL); | |
1492 | switch_to_section (s); | |
1493 | assemble_aligned_integer (INIT_ARRAY_ENTRY_BYTES, symbol); | |
1494 | } | |
1495 | ||
1496 | /* Implement TARGET_ASM_DESTRUCTOR. */ | |
1497 | static void | |
1498 | pru_elf_asm_destructor (rtx symbol, int priority) | |
1499 | { | |
1500 | char buf[23]; | |
1501 | section *s; | |
1502 | ||
1503 | if (priority == DEFAULT_INIT_PRIORITY) | |
1504 | snprintf (buf, sizeof (buf), ".fini_array"); | |
1505 | else | |
1506 | { | |
1507 | /* While priority is known to be in range [0, 65535], so 18 bytes | |
1508 | would be enough, the compiler might not know that. To avoid | |
1509 | -Wformat-truncation false positive, use a larger size. */ | |
1510 | snprintf (buf, sizeof (buf), ".fini_array.%.5u", priority); | |
1511 | } | |
1512 | s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL); | |
1513 | switch_to_section (s); | |
1514 | assemble_aligned_integer (INIT_ARRAY_ENTRY_BYTES, symbol); | |
1515 | } | |
1516 | ||
1517 | /* Map rtx_code to unsigned PRU branch op suffix. Callers must | |
1518 | handle sign comparison themselves for signed operations. */ | |
1519 | static const char * | |
1520 | pru_comparison_str (enum rtx_code cond) | |
1521 | { | |
1522 | switch (cond) | |
1523 | { | |
1524 | case NE: return "ne"; | |
1525 | case EQ: return "eq"; | |
1526 | case GEU: return "ge"; | |
1527 | case GTU: return "gt"; | |
1528 | case LEU: return "le"; | |
1529 | case LTU: return "lt"; | |
1530 | default: gcc_unreachable (); | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | /* Access some RTX as INT_MODE. If X is a CONST_FIXED we can get | |
1535 | the bit representation of X by "casting" it to CONST_INT. */ | |
1536 | ||
1537 | static rtx | |
1538 | pru_to_int_mode (rtx x) | |
1539 | { | |
1540 | machine_mode mode = GET_MODE (x); | |
1541 | ||
1542 | return VOIDmode == mode | |
1543 | ? x | |
1544 | : simplify_gen_subreg (int_mode_for_mode (mode).require (), x, mode, 0); | |
1545 | } | |
1546 | ||
1547 | /* Translate between the MachineDescription notion | |
1548 | of 8-bit consecutive registers, to the PRU | |
1549 | assembler syntax of REGWORD[.SUBREG]. */ | |
1550 | static const char * | |
1551 | pru_asm_regname (rtx op) | |
1552 | { | |
1553 | static char canon_reg_names[3][LAST_GP_REGNUM][8]; | |
1554 | int speci, regi; | |
1555 | ||
1556 | gcc_assert (REG_P (op)); | |
1557 | ||
1558 | if (!canon_reg_names[0][0][0]) | |
1559 | { | |
1560 | for (regi = 0; regi < LAST_GP_REGNUM; regi++) | |
1561 | for (speci = 0; speci < 3; speci++) | |
1562 | { | |
1563 | const int sz = (speci == 0) ? 1 : ((speci == 1) ? 2 : 4); | |
1564 | if ((regi + sz) > (32 * 4)) | |
1565 | continue; /* Invalid entry. */ | |
1566 | ||
1567 | /* Construct the lookup table. */ | |
1568 | const char *suffix = ""; | |
1569 | ||
1570 | switch ((sz << 8) | (regi % 4)) | |
1571 | { | |
1572 | case (1 << 8) | 0: suffix = ".b0"; break; | |
1573 | case (1 << 8) | 1: suffix = ".b1"; break; | |
1574 | case (1 << 8) | 2: suffix = ".b2"; break; | |
1575 | case (1 << 8) | 3: suffix = ".b3"; break; | |
1576 | case (2 << 8) | 0: suffix = ".w0"; break; | |
1577 | case (2 << 8) | 1: suffix = ".w1"; break; | |
1578 | case (2 << 8) | 2: suffix = ".w2"; break; | |
1579 | case (4 << 8) | 0: suffix = ""; break; | |
1580 | default: | |
1581 | /* Invalid entry. */ | |
1582 | continue; | |
1583 | } | |
1584 | sprintf (&canon_reg_names[speci][regi][0], | |
1585 | "r%d%s", regi / 4, suffix); | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | switch (GET_MODE_SIZE (GET_MODE (op))) | |
1590 | { | |
1591 | case 1: speci = 0; break; | |
1592 | case 2: speci = 1; break; | |
1593 | case 4: speci = 2; break; | |
1594 | case 8: speci = 2; break; /* Existing GCC test cases are not using %F. */ | |
1595 | default: gcc_unreachable (); | |
1596 | } | |
1597 | regi = REGNO (op); | |
1598 | gcc_assert (regi < LAST_GP_REGNUM); | |
1599 | gcc_assert (canon_reg_names[speci][regi][0]); | |
1600 | ||
1601 | return &canon_reg_names[speci][regi][0]; | |
1602 | } | |
1603 | ||
1604 | /* Print the operand OP to file stream FILE modified by LETTER. | |
1605 | LETTER can be one of: | |
1606 | ||
1607 | b: prints the register byte start (used by LBBO/SBBO). | |
1608 | B: prints 'c' or 'b' for CTABLE or REG base in a memory address. | |
1609 | F: Full 32-bit register. | |
1610 | H: Higher 16-bits of a const_int operand. | |
1611 | L: Lower 16-bits of a const_int operand. | |
1612 | N: prints next 32-bit register (upper 32bits of a 64bit REG couple). | |
1613 | P: prints swapped condition. | |
1614 | Q: prints swapped and reversed condition. | |
1615 | R: prints reversed condition. | |
1616 | S: print operand mode size (but do not print the operand itself). | |
1617 | T: print exact_log2 () for const_int operands. | |
1618 | u: print QI constant integer as unsigned. No transformation for regs. | |
1619 | V: print exact_log2 () of negated const_int operands. | |
1620 | w: Lower 32-bits of a const_int operand. | |
1621 | W: Upper 32-bits of a const_int operand. | |
1622 | y: print the next 8-bit register (regardless of op size). | |
1623 | z: print the second next 8-bit register (regardless of op size). | |
1624 | */ | |
1625 | static void | |
1626 | pru_print_operand (FILE *file, rtx op, int letter) | |
1627 | { | |
1628 | switch (letter) | |
1629 | { | |
1630 | case 'S': | |
1631 | fprintf (file, "%d", GET_MODE_SIZE (GET_MODE (op))); | |
1632 | return; | |
1633 | ||
1634 | default: | |
1635 | break; | |
1636 | } | |
1637 | ||
1638 | if (comparison_operator (op, VOIDmode)) | |
1639 | { | |
1640 | enum rtx_code cond = GET_CODE (op); | |
1641 | gcc_assert (!pru_signed_cmp_operator (op, VOIDmode)); | |
1642 | ||
1643 | switch (letter) | |
1644 | { | |
1645 | case 0: | |
1646 | fprintf (file, "%s", pru_comparison_str (cond)); | |
1647 | return; | |
1648 | case 'P': | |
1649 | fprintf (file, "%s", pru_comparison_str (swap_condition (cond))); | |
1650 | return; | |
1651 | case 'Q': | |
1652 | cond = swap_condition (cond); | |
1653 | /* Fall through to reverse. */ | |
1654 | case 'R': | |
1655 | fprintf (file, "%s", pru_comparison_str (reverse_condition (cond))); | |
1656 | return; | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | switch (GET_CODE (op)) | |
1661 | { | |
1662 | case REG: | |
1663 | if (letter == 0 || letter == 'u') | |
1664 | { | |
1665 | fprintf (file, "%s", pru_asm_regname (op)); | |
1666 | return; | |
1667 | } | |
1668 | else if (letter == 'b') | |
1669 | { | |
1670 | if (REGNO (op) > LAST_NONIO_GP_REGNUM) | |
1671 | { | |
1672 | output_operand_lossage ("I/O register operand for '%%%c'", | |
1673 | letter); | |
1674 | return; | |
1675 | } | |
1676 | fprintf (file, "r%d.b%d", REGNO (op) / 4, REGNO (op) % 4); | |
1677 | return; | |
1678 | } | |
1679 | else if (letter == 'F' || letter == 'N') | |
1680 | { | |
1681 | if (REGNO (op) > LAST_NONIO_GP_REGNUM - 1) | |
1682 | { | |
1683 | output_operand_lossage ("I/O register operand for '%%%c'", | |
1684 | letter); | |
1685 | return; | |
1686 | } | |
1687 | if (REGNO (op) % 4 != 0) | |
1688 | { | |
1689 | output_operand_lossage ("non 32 bit register operand for '%%%c'", | |
1690 | letter); | |
1691 | return; | |
1692 | } | |
1693 | fprintf (file, "r%d", REGNO (op) / 4 + (letter == 'N' ? 1 : 0)); | |
1694 | return; | |
1695 | } | |
1696 | else if (letter == 'y') | |
1697 | { | |
1698 | if (REGNO (op) > LAST_NONIO_GP_REGNUM - 1) | |
1699 | { | |
1700 | output_operand_lossage ("invalid operand for '%%%c'", letter); | |
1701 | return; | |
1702 | } | |
1703 | fprintf (file, "%s", reg_names[REGNO (op) + 1]); | |
1704 | return; | |
1705 | } | |
1706 | else if (letter == 'z') | |
1707 | { | |
1708 | if (REGNO (op) > LAST_NONIO_GP_REGNUM - 2) | |
1709 | { | |
1710 | output_operand_lossage ("invalid operand for '%%%c'", letter); | |
1711 | return; | |
1712 | } | |
1713 | fprintf (file, "%s", reg_names[REGNO (op) + 2]); | |
1714 | return; | |
1715 | } | |
1716 | break; | |
1717 | ||
1718 | case CONST_INT: | |
1719 | if (letter == 'H') | |
1720 | { | |
1721 | HOST_WIDE_INT val = INTVAL (op); | |
1722 | val = (val >> 16) & 0xFFFF; | |
1723 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1724 | return; | |
1725 | } | |
1726 | else if (letter == 'L') | |
1727 | { | |
1728 | HOST_WIDE_INT val = INTVAL (op); | |
1729 | val &= 0xFFFF; | |
1730 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1731 | return; | |
1732 | } | |
1733 | else if (letter == 'T') | |
1734 | { | |
1735 | /* The predicate should have already validated the 1-high-bit | |
1736 | requirement. Use CTZ here to deal with constant's sign | |
1737 | extension. */ | |
1738 | HOST_WIDE_INT val = wi::ctz (INTVAL (op)); | |
1739 | if (val < 0 || val > 31) | |
1740 | { | |
1741 | output_operand_lossage ("invalid operand for '%%%c'", letter); | |
1742 | return; | |
1743 | } | |
1744 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1745 | return; | |
1746 | } | |
1747 | else if (letter == 'V') | |
1748 | { | |
1749 | HOST_WIDE_INT val = wi::ctz (~INTVAL (op)); | |
1750 | if (val < 0 || val > 31) | |
1751 | { | |
1752 | output_operand_lossage ("invalid operand for '%%%c'", letter); | |
1753 | return; | |
1754 | } | |
1755 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1756 | return; | |
1757 | } | |
1758 | else if (letter == 'w') | |
1759 | { | |
1760 | HOST_WIDE_INT val = INTVAL (op) & 0xffffffff; | |
1761 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1762 | return; | |
1763 | } | |
1764 | else if (letter == 'W') | |
1765 | { | |
1766 | HOST_WIDE_INT val = (INTVAL (op) >> 32) & 0xffffffff; | |
1767 | output_addr_const (file, gen_int_mode (val, SImode)); | |
1768 | return; | |
1769 | } | |
1770 | else if (letter == 'u') | |
1771 | { | |
1772 | /* Workaround GCC's representation of QI constants in sign-extended | |
1773 | form, and PRU's assembler insistence on unsigned constant | |
1774 | integers. See the notes about O constraint. */ | |
1775 | fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (op) & 0xff); | |
1776 | return; | |
1777 | } | |
1778 | /* Else, fall through. */ | |
1779 | ||
1780 | case CONST: | |
1781 | case LABEL_REF: | |
1782 | case SYMBOL_REF: | |
1783 | if (letter == 0) | |
1784 | { | |
1785 | output_addr_const (file, op); | |
1786 | return; | |
1787 | } | |
1788 | break; | |
1789 | ||
1790 | case CONST_FIXED: | |
1791 | { | |
1792 | HOST_WIDE_INT ival = INTVAL (pru_to_int_mode (op)); | |
1793 | if (letter != 0) | |
1794 | output_operand_lossage ("unsupported code '%c' for fixed-point:", | |
1795 | letter); | |
1796 | fprintf (file, HOST_WIDE_INT_PRINT_DEC, ival); | |
1797 | return; | |
1798 | } | |
1799 | break; | |
1800 | ||
1801 | case CONST_DOUBLE: | |
1802 | if (letter == 0) | |
1803 | { | |
1804 | long val; | |
1805 | ||
1806 | if (GET_MODE (op) != SFmode) | |
1807 | { | |
1808 | output_operand_lossage ("double constants not supported"); | |
1809 | return; | |
1810 | } | |
1811 | REAL_VALUE_TO_TARGET_SINGLE (*CONST_DOUBLE_REAL_VALUE (op), val); | |
1812 | fprintf (file, "0x%lx", val); | |
1813 | return; | |
1814 | } | |
1815 | else if (letter == 'w' || letter == 'W') | |
1816 | { | |
1817 | long t[2]; | |
1818 | REAL_VALUE_TO_TARGET_DOUBLE (*CONST_DOUBLE_REAL_VALUE (op), t); | |
1819 | fprintf (file, "0x%lx", t[letter == 'w' ? 0 : 1]); | |
1820 | return; | |
1821 | } | |
1822 | else | |
1823 | { | |
1824 | output_operand_lossage ("invalid operand for '%%%c'", letter); | |
1825 | return; | |
1826 | } | |
1827 | break; | |
1828 | ||
1829 | case SUBREG: | |
1830 | /* Subregs should not appear at so late stage. */ | |
1831 | gcc_unreachable (); | |
1832 | break; | |
1833 | ||
1834 | case MEM: | |
1835 | if (letter == 0) | |
1836 | { | |
1837 | output_address (VOIDmode, op); | |
1838 | return; | |
1839 | } | |
1840 | else if (letter == 'B') | |
1841 | { | |
1842 | rtx base = XEXP (op, 0); | |
1843 | if (GET_CODE (base) == PLUS) | |
1844 | { | |
1845 | rtx op0 = XEXP (base, 0); | |
1846 | rtx op1 = XEXP (base, 1); | |
1847 | ||
1848 | /* PLUS cannot have two constant operands, so first one | |
1849 | of them must be a REG, hence we must check for an | |
1850 | exact base address. */ | |
1851 | if (ctable_base_operand (op1, VOIDmode)) | |
1852 | { | |
1853 | fprintf (file, "c"); | |
1854 | return; | |
1855 | } | |
1856 | else if (REG_P (op0)) | |
1857 | { | |
1858 | fprintf (file, "b"); | |
1859 | return; | |
1860 | } | |
1861 | else | |
1862 | gcc_unreachable (); | |
1863 | } | |
1864 | else if (REG_P (base)) | |
1865 | { | |
1866 | fprintf (file, "b"); | |
1867 | return; | |
1868 | } | |
1869 | else if (ctable_addr_operand (base, VOIDmode)) | |
1870 | { | |
1871 | fprintf (file, "c"); | |
1872 | return; | |
1873 | } | |
1874 | else | |
1875 | gcc_unreachable (); | |
1876 | } | |
1877 | break; | |
1878 | ||
1879 | case CODE_LABEL: | |
1880 | if (letter == 0) | |
1881 | { | |
1882 | output_addr_const (file, op); | |
1883 | return; | |
1884 | } | |
1885 | break; | |
1886 | ||
1887 | default: | |
1888 | break; | |
1889 | } | |
1890 | ||
1891 | output_operand_lossage ("unsupported operand %s for code '%c'", | |
1892 | GET_RTX_NAME (GET_CODE (op)), letter); | |
1893 | } | |
1894 | ||
1895 | /* Implement TARGET_PRINT_OPERAND_ADDRESS. */ | |
1896 | static void | |
1897 | pru_print_operand_address (FILE *file, machine_mode mode, rtx op) | |
1898 | { | |
1899 | if (CONSTANT_ADDRESS_P (op) && text_segment_operand (op, VOIDmode)) | |
1900 | { | |
1901 | output_operand_lossage ("unexpected text address:"); | |
1902 | return; | |
1903 | } | |
1904 | ||
1905 | switch (GET_CODE (op)) | |
1906 | { | |
1907 | case CONST: | |
1908 | case LABEL_REF: | |
1909 | case CONST_WIDE_INT: | |
1910 | case SYMBOL_REF: | |
1911 | break; | |
1912 | ||
1913 | case CONST_INT: | |
1914 | { | |
1915 | unsigned HOST_WIDE_INT caddr = INTVAL (op); | |
1916 | int base = pru_get_ctable_base_index (caddr); | |
1917 | int offs = pru_get_ctable_base_offset (caddr); | |
1918 | if (base < 0) | |
1919 | { | |
1920 | output_operand_lossage ("unsupported constant address:"); | |
1921 | return; | |
1922 | } | |
1923 | fprintf (file, "%d, %d", base, offs); | |
1924 | return; | |
1925 | } | |
1926 | break; | |
1927 | ||
1928 | case PLUS: | |
1929 | { | |
1930 | int base; | |
1931 | rtx op0 = XEXP (op, 0); | |
1932 | rtx op1 = XEXP (op, 1); | |
1933 | ||
1934 | if (REG_P (op0) && CONST_INT_P (op1) | |
1935 | && pru_get_ctable_exact_base_index (INTVAL (op1)) >= 0) | |
1936 | { | |
1937 | base = pru_get_ctable_exact_base_index (INTVAL (op1)); | |
1938 | fprintf (file, "%d, %s", base, pru_asm_regname (op0)); | |
1939 | return; | |
1940 | } | |
1941 | else if (REG_P (op1) && CONST_INT_P (op0) | |
1942 | && pru_get_ctable_exact_base_index (INTVAL (op0)) >= 0) | |
1943 | { | |
1944 | /* Not a valid RTL. */ | |
1945 | gcc_unreachable (); | |
1946 | } | |
1947 | else if (REG_P (op0) && CONSTANT_P (op1)) | |
1948 | { | |
1949 | fprintf (file, "%s, ", pru_asm_regname (op0)); | |
1950 | output_addr_const (file, op1); | |
1951 | return; | |
1952 | } | |
1953 | else if (REG_P (op1) && CONSTANT_P (op0)) | |
1954 | { | |
1955 | /* Not a valid RTL. */ | |
1956 | gcc_unreachable (); | |
1957 | } | |
1958 | else if (REG_P (op1) && REG_P (op0)) | |
1959 | { | |
1960 | fprintf (file, "%s, %s", pru_asm_regname (op0), | |
1961 | pru_asm_regname (op1)); | |
1962 | return; | |
1963 | } | |
1964 | } | |
1965 | break; | |
1966 | ||
1967 | case REG: | |
1968 | fprintf (file, "%s, 0", pru_asm_regname (op)); | |
1969 | return; | |
1970 | ||
1971 | case MEM: | |
1972 | { | |
1973 | rtx base = XEXP (op, 0); | |
1974 | pru_print_operand_address (file, mode, base); | |
1975 | return; | |
1976 | } | |
1977 | default: | |
1978 | break; | |
1979 | } | |
1980 | ||
1981 | output_operand_lossage ("unsupported memory expression:"); | |
1982 | } | |
1983 | ||
1984 | /* Implement TARGET_ASM_FUNCTION_PROLOGUE. */ | |
1985 | static void | |
1986 | pru_asm_function_prologue (FILE *file) | |
1987 | { | |
1988 | if (flag_verbose_asm || flag_debug_asm) | |
1989 | pru_dump_frame_layout (file); | |
1990 | } | |
1991 | ||
1992 | /* Implement `TARGET_ASM_INTEGER'. | |
1993 | Target hook for assembling integer objects. PRU version needs | |
1994 | special handling for references to pmem. Code copied from AVR. */ | |
1995 | ||
1996 | static bool | |
1997 | pru_assemble_integer (rtx x, unsigned int size, int aligned_p) | |
1998 | { | |
1999 | if (size == POINTER_SIZE / BITS_PER_UNIT | |
2000 | && aligned_p | |
2001 | && text_segment_operand (x, VOIDmode)) | |
2002 | { | |
2003 | fputs ("\t.4byte\t%pmem(", asm_out_file); | |
2004 | output_addr_const (asm_out_file, x); | |
2005 | fputs (")\n", asm_out_file); | |
2006 | ||
2007 | return true; | |
2008 | } | |
2009 | else if (size == INIT_ARRAY_ENTRY_BYTES | |
2010 | && aligned_p | |
2011 | && text_segment_operand (x, VOIDmode)) | |
2012 | { | |
2013 | fputs ("\t.2byte\t%pmem(", asm_out_file); | |
2014 | output_addr_const (asm_out_file, x); | |
2015 | fputs (")\n", asm_out_file); | |
2016 | ||
2017 | return true; | |
2018 | } | |
2019 | else | |
2020 | { | |
2021 | return default_assemble_integer (x, size, aligned_p); | |
2022 | } | |
2023 | } | |
2024 | ||
2025 | /* Implement TARGET_ASM_FILE_START. */ | |
2026 | ||
2027 | static void | |
2028 | pru_file_start (void) | |
2029 | { | |
2030 | default_file_start (); | |
2031 | ||
2032 | /* Compiler will take care of placing %label, so there is no | |
2033 | need to confuse users with this warning. */ | |
2034 | fprintf (asm_out_file, "\t.set no_warn_regname_label\n"); | |
2035 | } | |
2036 | \f | |
2037 | /* Function argument related. */ | |
2038 | ||
2039 | /* Return the number of bytes needed for storing an argument with | |
2040 | the given MODE and TYPE. */ | |
2041 | static int | |
2042 | pru_function_arg_size (machine_mode mode, const_tree type) | |
2043 | { | |
2044 | HOST_WIDE_INT param_size; | |
2045 | ||
2046 | if (mode == BLKmode) | |
2047 | param_size = int_size_in_bytes (type); | |
2048 | else | |
2049 | param_size = GET_MODE_SIZE (mode); | |
2050 | ||
2051 | /* Convert to words (round up). */ | |
2052 | param_size = (UNITS_PER_WORD - 1 + param_size) / UNITS_PER_WORD; | |
2053 | gcc_assert (param_size >= 0); | |
2054 | ||
2055 | return param_size; | |
2056 | } | |
2057 | ||
2058 | /* Check if argument with the given size must be | |
2059 | passed/returned in a register. | |
2060 | ||
2061 | Reference: | |
2062 | https://e2e.ti.com/support/development_tools/compiler/f/343/p/650176/2393029 | |
2063 | ||
2064 | Arguments other than 8/16/24/32/64bits are passed on stack. */ | |
2065 | static bool | |
2066 | pru_arg_in_reg_bysize (size_t sz) | |
2067 | { | |
2068 | return sz == 1 || sz == 2 || sz == 3 || sz == 4 || sz == 8; | |
2069 | } | |
2070 | ||
2071 | /* Helper function to get the starting storage HW register for an argument, | |
2072 | or -1 if it must be passed on stack. The cum_v state is not changed. */ | |
2073 | static int | |
2074 | pru_function_arg_regi (cumulative_args_t cum_v, | |
2075 | machine_mode mode, const_tree type, | |
2076 | bool named) | |
2077 | { | |
2078 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
2079 | size_t argsize = pru_function_arg_size (mode, type); | |
2080 | size_t i, bi; | |
2081 | int regi = -1; | |
2082 | ||
2083 | if (!pru_arg_in_reg_bysize (argsize)) | |
2084 | return -1; | |
2085 | ||
2086 | if (!named) | |
2087 | return -1; | |
2088 | ||
2089 | /* Find the first available slot that fits. Yes, that's the PRU ABI. */ | |
2090 | for (i = 0; regi < 0 && i < ARRAY_SIZE (cum->regs_used); i++) | |
2091 | { | |
2092 | /* VLAs and vector types are not defined in the PRU ABI. Let's | |
2093 | handle them the same as their same-sized counterparts. This way | |
2094 | we do not need to treat BLKmode differently, and need only to check | |
2095 | the size. */ | |
2096 | gcc_assert (argsize == 1 || argsize == 2 || argsize == 3 | |
2097 | || argsize == 4 || argsize == 8); | |
2098 | ||
2099 | /* Ensure SI and DI arguments are stored in full registers only. */ | |
2100 | if ((argsize >= 4) && (i % 4) != 0) | |
2101 | continue; | |
2102 | ||
2103 | /* Structures with size 24 bits are passed starting at a full | |
2104 | register boundary. */ | |
2105 | if (argsize == 3 && (i % 4) != 0) | |
2106 | continue; | |
2107 | ||
2108 | /* rX.w0/w1/w2 are OK. But avoid spreading the second byte | |
2109 | into a different full register. */ | |
2110 | if (argsize == 2 && (i % 4) == 3) | |
2111 | continue; | |
2112 | ||
2113 | for (bi = 0; | |
2114 | bi < argsize && (bi + i) < ARRAY_SIZE (cum->regs_used); | |
2115 | bi++) | |
2116 | { | |
2117 | if (cum->regs_used[bi + i]) | |
2118 | break; | |
2119 | } | |
2120 | if (bi == argsize) | |
2121 | regi = FIRST_ARG_REGNUM + i; | |
2122 | } | |
2123 | ||
2124 | return regi; | |
2125 | } | |
2126 | ||
2127 | /* Mark CUM_V that a function argument will occupy HW register slot starting | |
2128 | at REGI. The number of consecutive 8-bit HW registers marked as occupied | |
2129 | depends on the MODE and TYPE of the argument. */ | |
2130 | static void | |
2131 | pru_function_arg_regi_mark_slot (int regi, | |
2132 | cumulative_args_t cum_v, | |
2133 | machine_mode mode, const_tree type, | |
2134 | bool named) | |
2135 | { | |
2136 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
2137 | HOST_WIDE_INT param_size = pru_function_arg_size (mode, type); | |
2138 | ||
2139 | gcc_assert (named); | |
2140 | ||
2141 | /* Mark all byte sub-registers occupied by argument as used. */ | |
2142 | while (param_size--) | |
2143 | { | |
2144 | gcc_assert (regi >= FIRST_ARG_REGNUM && regi <= LAST_ARG_REGNUM); | |
2145 | gcc_assert (!cum->regs_used[regi - FIRST_ARG_REGNUM]); | |
2146 | cum->regs_used[regi - FIRST_ARG_REGNUM] = true; | |
2147 | regi++; | |
2148 | } | |
2149 | } | |
2150 | ||
2151 | /* Define where to put the arguments to a function. Value is zero to | |
2152 | push the argument on the stack, or a hard register in which to | |
2153 | store the argument. | |
2154 | ||
8d2af3a2 DD |
2155 | CUM is a variable of type CUMULATIVE_ARGS which gives info about |
2156 | the preceding args and about the function being called. | |
6783fdb7 | 2157 | ARG is a description of the argument. */ |
8d2af3a2 DD |
2158 | |
2159 | static rtx | |
6783fdb7 | 2160 | pru_function_arg (cumulative_args_t cum_v, const function_arg_info &arg) |
8d2af3a2 DD |
2161 | { |
2162 | rtx return_rtx = NULL_RTX; | |
6783fdb7 | 2163 | int regi = pru_function_arg_regi (cum_v, arg.mode, arg.type, arg.named); |
8d2af3a2 DD |
2164 | |
2165 | if (regi >= 0) | |
6783fdb7 | 2166 | return_rtx = gen_rtx_REG (arg.mode, regi); |
8d2af3a2 DD |
2167 | |
2168 | return return_rtx; | |
2169 | } | |
2170 | ||
2171 | /* Implement TARGET_ARG_PARTIAL_BYTES. PRU never splits any arguments | |
2172 | between registers and memory, so we can return 0. */ | |
2173 | ||
2174 | static int | |
a7c81bc1 | 2175 | pru_arg_partial_bytes (cumulative_args_t, const function_arg_info &) |
8d2af3a2 DD |
2176 | { |
2177 | return 0; | |
2178 | } | |
2179 | ||
6930c98c | 2180 | /* Update the data in CUM to advance over argument ARG. */ |
8d2af3a2 DD |
2181 | |
2182 | static void | |
6930c98c RS |
2183 | pru_function_arg_advance (cumulative_args_t cum_v, |
2184 | const function_arg_info &arg) | |
8d2af3a2 | 2185 | { |
6930c98c | 2186 | int regi = pru_function_arg_regi (cum_v, arg.mode, arg.type, arg.named); |
8d2af3a2 DD |
2187 | |
2188 | if (regi >= 0) | |
6930c98c RS |
2189 | pru_function_arg_regi_mark_slot (regi, cum_v, arg.mode, |
2190 | arg.type, arg.named); | |
8d2af3a2 DD |
2191 | } |
2192 | ||
2193 | /* Implement TARGET_FUNCTION_VALUE. */ | |
2194 | static rtx | |
2195 | pru_function_value (const_tree ret_type, const_tree fn ATTRIBUTE_UNUSED, | |
2196 | bool outgoing ATTRIBUTE_UNUSED) | |
2197 | { | |
2198 | return gen_rtx_REG (TYPE_MODE (ret_type), FIRST_RETVAL_REGNUM); | |
2199 | } | |
2200 | ||
2201 | /* Implement TARGET_LIBCALL_VALUE. */ | |
2202 | static rtx | |
2203 | pru_libcall_value (machine_mode mode, const_rtx fun ATTRIBUTE_UNUSED) | |
2204 | { | |
2205 | return gen_rtx_REG (mode, FIRST_RETVAL_REGNUM); | |
2206 | } | |
2207 | ||
2208 | /* Implement TARGET_FUNCTION_VALUE_REGNO_P. */ | |
2209 | static bool | |
2210 | pru_function_value_regno_p (const unsigned int regno) | |
2211 | { | |
2212 | return regno == FIRST_RETVAL_REGNUM; | |
2213 | } | |
2214 | ||
2215 | /* Implement TARGET_RETURN_IN_MEMORY. */ | |
2216 | bool | |
2217 | pru_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED) | |
2218 | { | |
2219 | bool in_memory = (!pru_arg_in_reg_bysize (int_size_in_bytes (type)) | |
2220 | || int_size_in_bytes (type) == -1); | |
2221 | ||
2222 | return in_memory; | |
2223 | } | |
2224 | \f | |
2225 | /* Implement TARGET_CAN_USE_DOLOOP_P. */ | |
2226 | ||
2227 | static bool | |
2228 | pru_can_use_doloop_p (const widest_int &, const widest_int &iterations_max, | |
2229 | unsigned int loop_depth, bool) | |
2230 | { | |
2231 | /* Considering limitations in the hardware, only use doloop | |
2232 | for innermost loops which must be entered from the top. */ | |
2233 | if (loop_depth > 1) | |
2234 | return false; | |
2235 | /* PRU internal loop counter is 16bits wide. Remember that iterations_max | |
2236 | holds the maximum number of loop latch executions, while PRU loop | |
2237 | instruction needs the count of loop body executions. */ | |
2238 | if (iterations_max == 0 || wi::geu_p (iterations_max, 0xffff)) | |
2239 | return false; | |
2240 | ||
2241 | return true; | |
2242 | } | |
2243 | ||
2244 | /* NULL if INSN insn is valid within a low-overhead loop. | |
2245 | Otherwise return why doloop cannot be applied. */ | |
2246 | ||
2247 | static const char * | |
2248 | pru_invalid_within_doloop (const rtx_insn *insn) | |
2249 | { | |
2250 | if (CALL_P (insn)) | |
2251 | return "Function call in the loop."; | |
2252 | ||
2253 | if (JUMP_P (insn) && INSN_CODE (insn) == CODE_FOR_return) | |
2254 | return "Return from a call instruction in the loop."; | |
2255 | ||
2256 | if (NONDEBUG_INSN_P (insn) | |
2257 | && INSN_CODE (insn) < 0 | |
2258 | && (GET_CODE (PATTERN (insn)) == ASM_INPUT | |
2259 | || asm_noperands (PATTERN (insn)) >= 0)) | |
2260 | return "Loop contains asm statement."; | |
2261 | ||
2262 | return NULL; | |
2263 | } | |
2264 | ||
2265 | ||
2266 | /* Figure out where to put LABEL, which is the label for a repeat loop. | |
2267 | The loop ends just before LAST_INSN. If SHARED, insns other than the | |
2268 | "repeat" might use LABEL to jump to the loop's continuation point. | |
2269 | ||
2270 | Return the last instruction in the adjusted loop. */ | |
2271 | ||
2272 | static rtx_insn * | |
2273 | pru_insert_loop_label_last (rtx_insn *last_insn, rtx_code_label *label, | |
2274 | bool shared) | |
2275 | { | |
2276 | rtx_insn *next, *prev; | |
2277 | int count = 0, code, icode; | |
2278 | ||
2279 | if (dump_file) | |
2280 | fprintf (dump_file, "considering end of repeat loop at insn %d\n", | |
2281 | INSN_UID (last_insn)); | |
2282 | ||
2283 | /* Set PREV to the last insn in the loop. */ | |
2284 | prev = PREV_INSN (last_insn); | |
2285 | ||
2286 | /* Set NEXT to the next insn after the loop label. */ | |
2287 | next = last_insn; | |
2288 | if (!shared) | |
2289 | while (prev != 0) | |
2290 | { | |
2291 | code = GET_CODE (prev); | |
2292 | if (code == CALL_INSN || code == CODE_LABEL || code == BARRIER) | |
2293 | break; | |
2294 | ||
2295 | if (INSN_P (prev)) | |
2296 | { | |
2297 | if (GET_CODE (PATTERN (prev)) == SEQUENCE) | |
2298 | prev = as_a <rtx_insn *> (XVECEXP (PATTERN (prev), 0, 1)); | |
2299 | ||
2300 | /* Other insns that should not be in the last two opcodes. */ | |
2301 | icode = recog_memoized (prev); | |
2302 | if (icode < 0 | |
2303 | || icode == CODE_FOR_pruloophi | |
2304 | || icode == CODE_FOR_pruloopsi) | |
2305 | break; | |
2306 | ||
2307 | count++; | |
2308 | next = prev; | |
2309 | if (dump_file) | |
2310 | print_rtl_single (dump_file, next); | |
2311 | if (count == 2) | |
2312 | break; | |
2313 | } | |
2314 | prev = PREV_INSN (prev); | |
2315 | } | |
2316 | ||
2317 | /* Insert the nops. */ | |
2318 | if (dump_file && count < 2) | |
2319 | fprintf (dump_file, "Adding %d nop%s inside loop\n\n", | |
2320 | 2 - count, count == 1 ? "" : "s"); | |
2321 | ||
2322 | for (; count < 2; count++) | |
2323 | emit_insn_before (gen_nop (), last_insn); | |
2324 | ||
2325 | /* Insert the label. */ | |
2326 | emit_label_before (label, last_insn); | |
2327 | ||
2328 | return last_insn; | |
2329 | } | |
2330 | ||
2331 | /* If IS_END is false, expand a canonical doloop_begin RTL into the | |
2332 | PRU-specific doloop_begin_internal. Otherwise expand doloop_end to | |
2333 | doloop_end_internal. */ | |
2334 | void | |
2335 | pru_emit_doloop (rtx *operands, int is_end) | |
2336 | { | |
2337 | rtx tag; | |
2338 | ||
2339 | if (cfun->machine->doloop_tags == 0 | |
2340 | || cfun->machine->doloop_tag_from_end == is_end) | |
2341 | { | |
2342 | cfun->machine->doloop_tags++; | |
2343 | cfun->machine->doloop_tag_from_end = is_end; | |
2344 | } | |
2345 | ||
2346 | tag = GEN_INT (cfun->machine->doloop_tags - 1); | |
2347 | machine_mode opmode = GET_MODE (operands[0]); | |
2348 | if (is_end) | |
2349 | { | |
2350 | if (opmode == HImode) | |
2351 | emit_jump_insn (gen_doloop_end_internalhi (operands[0], | |
2352 | operands[1], tag)); | |
2353 | else if (opmode == SImode) | |
2354 | emit_jump_insn (gen_doloop_end_internalsi (operands[0], | |
2355 | operands[1], tag)); | |
2356 | else | |
2357 | gcc_unreachable (); | |
2358 | } | |
2359 | else | |
2360 | { | |
2361 | if (opmode == HImode) | |
2362 | emit_insn (gen_doloop_begin_internalhi (operands[0], operands[0], tag)); | |
2363 | else if (opmode == SImode) | |
2364 | emit_insn (gen_doloop_begin_internalsi (operands[0], operands[0], tag)); | |
2365 | else | |
2366 | gcc_unreachable (); | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | ||
2371 | /* Code for converting doloop_begins and doloop_ends into valid | |
2372 | PRU instructions. Idea and code snippets borrowed from mep port. | |
2373 | ||
2374 | A doloop_begin is just a placeholder: | |
2375 | ||
2376 | $count = unspec ($count) | |
2377 | ||
2378 | where $count is initially the number of iterations. | |
2379 | doloop_end has the form: | |
2380 | ||
2381 | if (--$count == 0) goto label | |
2382 | ||
2383 | The counter variable is private to the doloop insns, nothing else | |
2384 | relies on its value. | |
2385 | ||
2386 | There are three cases, in decreasing order of preference: | |
2387 | ||
2388 | 1. A loop has exactly one doloop_begin and one doloop_end. | |
2389 | The doloop_end branches to the first instruction after | |
2390 | the doloop_begin. | |
2391 | ||
2392 | In this case we can replace the doloop_begin with a LOOP | |
2393 | instruction and remove the doloop_end. I.e.: | |
2394 | ||
2395 | $count1 = unspec ($count1) | |
2396 | label: | |
2397 | ... | |
2398 | if (--$count2 != 0) goto label | |
2399 | ||
2400 | becomes: | |
2401 | ||
2402 | LOOP end_label,$count1 | |
2403 | label: | |
2404 | ... | |
2405 | end_label: | |
2406 | # end loop | |
2407 | ||
2408 | 2. As for (1), except there are several doloop_ends. One of them | |
2409 | (call it X) falls through to a label L. All the others fall | |
2410 | through to branches to L. | |
2411 | ||
2412 | In this case, we remove X and replace the other doloop_ends | |
2413 | with branches to the LOOP label. For example: | |
2414 | ||
2415 | $count1 = unspec ($count1) | |
2416 | label: | |
2417 | ... | |
2418 | if (--$count1 != 0) goto label | |
2419 | end_label: | |
2420 | ... | |
2421 | if (--$count2 != 0) goto label | |
2422 | goto end_label | |
2423 | ||
2424 | becomes: | |
2425 | ||
2426 | LOOP end_label,$count1 | |
2427 | label: | |
2428 | ... | |
2429 | end_label: | |
2430 | # end repeat | |
2431 | ... | |
2432 | goto end_label | |
2433 | ||
2434 | 3. The fallback case. Replace doloop_begins with: | |
2435 | ||
2436 | $count = $count | |
2437 | ||
2438 | Replace doloop_ends with the equivalent of: | |
2439 | ||
2440 | $count = $count - 1 | |
2441 | if ($count != 0) goto loop_label | |
2442 | ||
2443 | */ | |
2444 | ||
2445 | /* A structure describing one doloop_begin. */ | |
2446 | struct pru_doloop_begin { | |
2447 | /* The next doloop_begin with the same tag. */ | |
2448 | struct pru_doloop_begin *next; | |
2449 | ||
2450 | /* The instruction itself. */ | |
2451 | rtx_insn *insn; | |
2452 | ||
2453 | /* The initial counter value. */ | |
2454 | rtx loop_count; | |
2455 | ||
2456 | /* The counter register. */ | |
2457 | rtx counter; | |
2458 | }; | |
2459 | ||
2460 | /* A structure describing a doloop_end. */ | |
2461 | struct pru_doloop_end { | |
2462 | /* The next doloop_end with the same loop tag. */ | |
2463 | struct pru_doloop_end *next; | |
2464 | ||
2465 | /* The instruction itself. */ | |
2466 | rtx_insn *insn; | |
2467 | ||
2468 | /* The first instruction after INSN when the branch isn't taken. */ | |
2469 | rtx_insn *fallthrough; | |
2470 | ||
2471 | /* The location of the counter value. Since doloop_end_internal is a | |
2472 | jump instruction, it has to allow the counter to be stored anywhere | |
2473 | (any non-fixed register). */ | |
2474 | rtx counter; | |
2475 | ||
2476 | /* The target label (the place where the insn branches when the counter | |
2477 | isn't zero). */ | |
2478 | rtx label; | |
2479 | ||
2480 | /* A scratch register. Only available when COUNTER isn't stored | |
2481 | in a general register. */ | |
2482 | rtx scratch; | |
2483 | }; | |
2484 | ||
2485 | ||
2486 | /* One do-while loop. */ | |
2487 | struct pru_doloop { | |
2488 | /* All the doloop_begins for this loop (in no particular order). */ | |
2489 | struct pru_doloop_begin *begin; | |
2490 | ||
2491 | /* All the doloop_ends. When there is more than one, arrange things | |
2492 | so that the first one is the most likely to be X in case (2) above. */ | |
2493 | struct pru_doloop_end *end; | |
2494 | }; | |
2495 | ||
2496 | ||
2497 | /* Return true if LOOP can be converted into LOOP form | |
2498 | (that is, if it matches cases (1) or (2) above). */ | |
2499 | ||
2500 | static bool | |
2501 | pru_repeat_loop_p (struct pru_doloop *loop) | |
2502 | { | |
2503 | struct pru_doloop_end *end; | |
2504 | rtx_insn *fallthrough; | |
2505 | ||
2506 | /* There must be exactly one doloop_begin and at least one doloop_end. */ | |
2507 | if (loop->begin == 0 || loop->end == 0 || loop->begin->next != 0) | |
2508 | return false; | |
2509 | ||
2510 | /* The first doloop_end (X) must branch back to the insn after | |
2511 | the doloop_begin. */ | |
2512 | if (prev_real_insn (as_a<rtx_insn *> (loop->end->label)) != loop->begin->insn) | |
2513 | return false; | |
2514 | ||
2515 | /* Check that the first doloop_end (X) can actually reach | |
2516 | doloop_begin () with U8_PCREL relocation for LOOP instruction. */ | |
2517 | if (get_attr_length (loop->end->insn) != 4) | |
2518 | return false; | |
2519 | ||
2520 | /* All the other doloop_ends must branch to the same place as X. | |
2521 | When the branch isn't taken, they must jump to the instruction | |
2522 | after X. */ | |
2523 | fallthrough = loop->end->fallthrough; | |
2524 | for (end = loop->end->next; end != 0; end = end->next) | |
2525 | if (end->label != loop->end->label | |
2526 | || !simplejump_p (end->fallthrough) | |
2527 | || fallthrough | |
2528 | != next_real_insn (JUMP_LABEL_AS_INSN (end->fallthrough))) | |
2529 | return false; | |
2530 | ||
2531 | return true; | |
2532 | } | |
2533 | ||
2534 | ||
2535 | /* The main repeat reorg function. See comment above for details. */ | |
2536 | ||
2537 | static void | |
2538 | pru_reorg_loop (rtx_insn *insns) | |
2539 | { | |
2540 | rtx_insn *insn; | |
2541 | struct pru_doloop *loops, *loop; | |
2542 | struct pru_doloop_begin *begin; | |
2543 | struct pru_doloop_end *end; | |
2544 | size_t tmpsz; | |
2545 | ||
2546 | /* Quick exit if we haven't created any loops. */ | |
2547 | if (cfun->machine->doloop_tags == 0) | |
2548 | return; | |
2549 | ||
2550 | /* Create an array of pru_doloop structures. */ | |
2551 | tmpsz = sizeof (loops[0]) * cfun->machine->doloop_tags; | |
2552 | loops = (struct pru_doloop *) alloca (tmpsz); | |
2553 | memset (loops, 0, sizeof (loops[0]) * cfun->machine->doloop_tags); | |
2554 | ||
2555 | /* Search the function for do-while insns and group them by loop tag. */ | |
2556 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
2557 | if (INSN_P (insn)) | |
2558 | switch (recog_memoized (insn)) | |
2559 | { | |
2560 | case CODE_FOR_doloop_begin_internalhi: | |
2561 | case CODE_FOR_doloop_begin_internalsi: | |
2562 | insn_extract (insn); | |
2563 | loop = &loops[INTVAL (recog_data.operand[2])]; | |
2564 | ||
2565 | tmpsz = sizeof (struct pru_doloop_begin); | |
2566 | begin = (struct pru_doloop_begin *) alloca (tmpsz); | |
2567 | begin->next = loop->begin; | |
2568 | begin->insn = insn; | |
2569 | begin->loop_count = recog_data.operand[1]; | |
2570 | begin->counter = recog_data.operand[0]; | |
2571 | ||
2572 | loop->begin = begin; | |
2573 | break; | |
2574 | ||
2575 | case CODE_FOR_doloop_end_internalhi: | |
2576 | case CODE_FOR_doloop_end_internalsi: | |
2577 | insn_extract (insn); | |
2578 | loop = &loops[INTVAL (recog_data.operand[2])]; | |
2579 | ||
2580 | tmpsz = sizeof (struct pru_doloop_end); | |
2581 | end = (struct pru_doloop_end *) alloca (tmpsz); | |
2582 | end->insn = insn; | |
2583 | end->fallthrough = next_real_insn (insn); | |
2584 | end->counter = recog_data.operand[0]; | |
2585 | end->label = recog_data.operand[1]; | |
2586 | end->scratch = recog_data.operand[3]; | |
2587 | ||
2588 | /* If this insn falls through to an unconditional jump, | |
2589 | give it a lower priority than the others. */ | |
2590 | if (loop->end != 0 && simplejump_p (end->fallthrough)) | |
2591 | { | |
2592 | end->next = loop->end->next; | |
2593 | loop->end->next = end; | |
2594 | } | |
2595 | else | |
2596 | { | |
2597 | end->next = loop->end; | |
2598 | loop->end = end; | |
2599 | } | |
2600 | break; | |
2601 | } | |
2602 | ||
2603 | /* Convert the insns for each loop in turn. */ | |
2604 | for (loop = loops; loop < loops + cfun->machine->doloop_tags; loop++) | |
2605 | if (pru_repeat_loop_p (loop)) | |
2606 | { | |
2607 | /* Case (1) or (2). */ | |
2608 | rtx_code_label *repeat_label; | |
2609 | rtx label_ref; | |
2610 | ||
2611 | /* Create a new label for the repeat insn. */ | |
2612 | repeat_label = gen_label_rtx (); | |
2613 | ||
2614 | /* Replace the doloop_begin with a repeat. We get rid | |
2615 | of the iteration register because LOOP instruction | |
2616 | will utilize an internal for the PRU core LOOP register. */ | |
2617 | label_ref = gen_rtx_LABEL_REF (VOIDmode, repeat_label); | |
2618 | machine_mode loop_mode = GET_MODE (loop->begin->loop_count); | |
2619 | if (loop_mode == HImode) | |
2620 | emit_insn_before (gen_pruloophi (loop->begin->loop_count, label_ref), | |
2621 | loop->begin->insn); | |
2622 | else if (loop_mode == SImode) | |
2623 | { | |
2624 | rtx loop_rtx = gen_pruloopsi (loop->begin->loop_count, label_ref); | |
2625 | emit_insn_before (loop_rtx, loop->begin->insn); | |
2626 | } | |
2627 | else if (loop_mode == VOIDmode) | |
2628 | { | |
2629 | gcc_assert (CONST_INT_P (loop->begin->loop_count)); | |
2630 | gcc_assert (UBYTE_INT ( INTVAL (loop->begin->loop_count))); | |
2631 | rtx loop_rtx = gen_pruloopsi (loop->begin->loop_count, label_ref); | |
2632 | emit_insn_before (loop_rtx, loop->begin->insn); | |
2633 | } | |
2634 | else | |
2635 | gcc_unreachable (); | |
2636 | delete_insn (loop->begin->insn); | |
2637 | ||
2638 | /* Insert the repeat label before the first doloop_end. | |
2639 | Fill the gap with nops if LOOP insn is less than 2 | |
2640 | instructions away than loop->end. */ | |
2641 | pru_insert_loop_label_last (loop->end->insn, repeat_label, | |
2642 | loop->end->next != 0); | |
2643 | ||
2644 | /* Emit a pruloop_end (to improve the readability of the output). */ | |
2645 | emit_insn_before (gen_pruloop_end (), loop->end->insn); | |
2646 | ||
2647 | /* HACK: TODO: This is usually not needed, but is required for | |
2648 | a few rare cases where a JUMP that breaks the loop | |
2649 | references the LOOP_END address. In other words, since | |
2650 | we're missing a real "loop_end" instruction, a loop "break" | |
2651 | may accidentally reference the loop end itself, and thus | |
2652 | continuing the cycle. */ | |
2653 | for (insn = NEXT_INSN (loop->end->insn); | |
2654 | insn != next_real_insn (loop->end->insn); | |
2655 | insn = NEXT_INSN (insn)) | |
2656 | { | |
2657 | if (LABEL_P (insn) && LABEL_NUSES (insn) > 0) | |
2658 | emit_insn_before (gen_nop_loop_guard (), loop->end->insn); | |
2659 | } | |
2660 | ||
2661 | /* Delete the first doloop_end. */ | |
2662 | delete_insn (loop->end->insn); | |
2663 | ||
2664 | /* Replace the others with branches to REPEAT_LABEL. */ | |
2665 | for (end = loop->end->next; end != 0; end = end->next) | |
2666 | { | |
2667 | rtx_insn *newjmp; | |
2668 | newjmp = emit_jump_insn_before (gen_jump (repeat_label), end->insn); | |
2669 | JUMP_LABEL (newjmp) = repeat_label; | |
2670 | delete_insn (end->insn); | |
2671 | delete_insn (end->fallthrough); | |
2672 | } | |
2673 | } | |
2674 | else | |
2675 | { | |
2676 | /* Case (3). First replace all the doloop_begins with setting | |
2677 | the HW register used for loop counter. */ | |
2678 | for (begin = loop->begin; begin != 0; begin = begin->next) | |
2679 | { | |
2680 | insn = gen_move_insn (copy_rtx (begin->counter), | |
2681 | copy_rtx (begin->loop_count)); | |
2682 | emit_insn_before (insn, begin->insn); | |
2683 | delete_insn (begin->insn); | |
2684 | } | |
2685 | ||
2686 | /* Replace all the doloop_ends with decrement-and-branch sequences. */ | |
2687 | for (end = loop->end; end != 0; end = end->next) | |
2688 | { | |
2689 | rtx reg; | |
2690 | ||
2691 | start_sequence (); | |
2692 | ||
2693 | /* Load the counter value into a general register. */ | |
2694 | reg = end->counter; | |
2695 | if (!REG_P (reg) || REGNO (reg) > LAST_NONIO_GP_REGNUM) | |
2696 | { | |
2697 | reg = end->scratch; | |
2698 | emit_move_insn (copy_rtx (reg), copy_rtx (end->counter)); | |
2699 | } | |
2700 | ||
2701 | /* Decrement the counter. */ | |
2702 | emit_insn (gen_add3_insn (copy_rtx (reg), copy_rtx (reg), | |
2703 | constm1_rtx)); | |
2704 | ||
2705 | /* Copy it back to its original location. */ | |
2706 | if (reg != end->counter) | |
2707 | emit_move_insn (copy_rtx (end->counter), copy_rtx (reg)); | |
2708 | ||
2709 | /* Jump back to the start label. */ | |
2710 | insn = emit_jump_insn (gen_cbranchsi4 (gen_rtx_NE (VOIDmode, reg, | |
2711 | const0_rtx), | |
2712 | reg, | |
2713 | const0_rtx, | |
2714 | end->label)); | |
2715 | ||
2716 | JUMP_LABEL (insn) = end->label; | |
2717 | LABEL_NUSES (end->label)++; | |
2718 | ||
2719 | /* Emit the whole sequence before the doloop_end. */ | |
2720 | insn = get_insns (); | |
2721 | end_sequence (); | |
2722 | emit_insn_before (insn, end->insn); | |
2723 | ||
2724 | /* Delete the doloop_end. */ | |
2725 | delete_insn (end->insn); | |
2726 | } | |
2727 | } | |
2728 | } | |
2729 | ||
2730 | /* Implement TARGET_MACHINE_DEPENDENT_REORG. */ | |
2731 | static void | |
2732 | pru_reorg (void) | |
2733 | { | |
2734 | rtx_insn *insns = get_insns (); | |
2735 | ||
2736 | compute_bb_for_insn (); | |
2737 | df_analyze (); | |
2738 | ||
2739 | /* Need correct insn lengths for allowing LOOP instruction | |
2740 | emitting due to U8_PCREL limitations. */ | |
2741 | shorten_branches (get_insns ()); | |
2742 | ||
2743 | /* The generic reorg_loops () is not suitable for PRU because | |
2744 | it doesn't handle doloop_begin/end tying. And we need our | |
2745 | doloop_begin emitted before reload. It is difficult to coalesce | |
2746 | UBYTE constant initial loop values into the LOOP insn during | |
2747 | machine reorg phase. */ | |
2748 | pru_reorg_loop (insns); | |
2749 | ||
2750 | df_finish_pass (false); | |
2751 | } | |
2752 | \f | |
2753 | /* Enumerate all PRU-specific builtins. */ | |
2754 | enum pru_builtin | |
2755 | { | |
2756 | PRU_BUILTIN_DELAY_CYCLES, | |
2757 | PRU_BUILTIN_max | |
2758 | }; | |
2759 | ||
2760 | static GTY(()) tree pru_builtins [(int) PRU_BUILTIN_max]; | |
2761 | ||
2762 | /* Implement TARGET_INIT_BUILTINS. */ | |
2763 | ||
2764 | static void | |
2765 | pru_init_builtins (void) | |
2766 | { | |
2767 | tree void_ftype_longlong | |
2768 | = build_function_type_list (void_type_node, | |
2769 | long_long_integer_type_node, | |
2770 | NULL); | |
2771 | ||
2772 | pru_builtins[PRU_BUILTIN_DELAY_CYCLES] | |
2773 | = add_builtin_function ("__delay_cycles", void_ftype_longlong, | |
2774 | PRU_BUILTIN_DELAY_CYCLES, BUILT_IN_MD, NULL, | |
2775 | NULL_TREE); | |
2776 | } | |
2777 | ||
2778 | /* Implement TARGET_BUILTIN_DECL. */ | |
2779 | ||
2780 | static tree | |
2781 | pru_builtin_decl (unsigned code, bool initialize_p ATTRIBUTE_UNUSED) | |
2782 | { | |
2783 | switch (code) | |
2784 | { | |
2785 | case PRU_BUILTIN_DELAY_CYCLES: | |
2786 | return pru_builtins[code]; | |
2787 | default: | |
2788 | return error_mark_node; | |
2789 | } | |
2790 | } | |
2791 | \f | |
2792 | /* Emit a sequence of one or more delay_cycles_X insns, in order to generate | |
2793 | code that delays exactly ARG cycles. */ | |
2794 | ||
2795 | static rtx | |
2796 | pru_expand_delay_cycles (rtx arg) | |
2797 | { | |
2798 | HOST_WIDE_INT c, n; | |
2799 | ||
2800 | if (GET_CODE (arg) != CONST_INT) | |
2801 | { | |
2802 | error ("%<__delay_cycles%> only takes constant arguments"); | |
2803 | return NULL_RTX; | |
2804 | } | |
2805 | ||
2806 | c = INTVAL (arg); | |
2807 | ||
2808 | gcc_assert (HOST_BITS_PER_WIDE_INT > 32); | |
2809 | if (c < 0) | |
2810 | { | |
2811 | error ("%<__delay_cycles%> only takes non-negative cycle counts"); | |
2812 | return NULL_RTX; | |
2813 | } | |
2814 | ||
2815 | emit_insn (gen_delay_cycles_start (arg)); | |
2816 | ||
2817 | /* For 32-bit loops, there's 2 + 2x cycles. */ | |
2818 | if (c > 2 * 0xffff + 1) | |
2819 | { | |
2820 | n = (c - 2) / 2; | |
2821 | c -= (n * 2) + 2; | |
2822 | if ((unsigned long long) n > 0xffffffffULL) | |
2823 | { | |
2824 | error ("%<__delay_cycles%> is limited to 32-bit loop counts"); | |
2825 | return NULL_RTX; | |
2826 | } | |
2827 | emit_insn (gen_delay_cycles_2x_plus2_si (GEN_INT (n))); | |
2828 | } | |
2829 | ||
2830 | /* For 16-bit loops, there's 1 + 2x cycles. */ | |
2831 | if (c > 2) | |
2832 | { | |
2833 | n = (c - 1) / 2; | |
2834 | c -= (n * 2) + 1; | |
2835 | ||
2836 | emit_insn (gen_delay_cycles_2x_plus1_hi (GEN_INT (n))); | |
2837 | } | |
2838 | ||
2839 | while (c > 0) | |
2840 | { | |
2841 | emit_insn (gen_delay_cycles_1 ()); | |
2842 | c -= 1; | |
2843 | } | |
2844 | ||
2845 | emit_insn (gen_delay_cycles_end (arg)); | |
2846 | ||
2847 | return NULL_RTX; | |
2848 | } | |
2849 | ||
2850 | ||
2851 | /* Implement TARGET_EXPAND_BUILTIN. Expand an expression EXP that calls | |
2852 | a built-in function, with result going to TARGET if that's convenient | |
2853 | (and in mode MODE if that's convenient). | |
2854 | SUBTARGET may be used as the target for computing one of EXP's operands. | |
2855 | IGNORE is nonzero if the value is to be ignored. */ | |
2856 | ||
2857 | static rtx | |
2858 | pru_expand_builtin (tree exp, rtx target ATTRIBUTE_UNUSED, | |
2859 | rtx subtarget ATTRIBUTE_UNUSED, | |
2860 | machine_mode mode ATTRIBUTE_UNUSED, | |
2861 | int ignore ATTRIBUTE_UNUSED) | |
2862 | { | |
2863 | tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0); | |
4d732405 | 2864 | unsigned int fcode = DECL_MD_FUNCTION_CODE (fndecl); |
8d2af3a2 DD |
2865 | rtx arg1 = expand_normal (CALL_EXPR_ARG (exp, 0)); |
2866 | ||
2867 | if (fcode == PRU_BUILTIN_DELAY_CYCLES) | |
2868 | return pru_expand_delay_cycles (arg1); | |
2869 | ||
2870 | internal_error ("bad builtin code"); | |
2871 | ||
2872 | return NULL_RTX; | |
2873 | } | |
2874 | \f | |
2875 | /* Remember the last target of pru_set_current_function. */ | |
2876 | static GTY(()) tree pru_previous_fndecl; | |
2877 | ||
2878 | /* Establish appropriate back-end context for processing the function | |
2879 | FNDECL. The argument might be NULL to indicate processing at top | |
2880 | level, outside of any function scope. */ | |
2881 | static void | |
2882 | pru_set_current_function (tree fndecl) | |
2883 | { | |
2884 | tree old_tree = (pru_previous_fndecl | |
2885 | ? DECL_FUNCTION_SPECIFIC_TARGET (pru_previous_fndecl) | |
2886 | : NULL_TREE); | |
2887 | ||
2888 | tree new_tree = (fndecl | |
2889 | ? DECL_FUNCTION_SPECIFIC_TARGET (fndecl) | |
2890 | : NULL_TREE); | |
2891 | ||
2892 | if (fndecl && fndecl != pru_previous_fndecl) | |
2893 | { | |
2894 | pru_previous_fndecl = fndecl; | |
2895 | if (old_tree == new_tree) | |
2896 | ; | |
2897 | ||
2898 | else if (new_tree) | |
2899 | { | |
2900 | cl_target_option_restore (&global_options, | |
2901 | TREE_TARGET_OPTION (new_tree)); | |
2902 | target_reinit (); | |
2903 | } | |
2904 | ||
2905 | else if (old_tree) | |
2906 | { | |
2907 | struct cl_target_option *def | |
2908 | = TREE_TARGET_OPTION (target_option_current_node); | |
2909 | ||
2910 | cl_target_option_restore (&global_options, def); | |
2911 | target_reinit (); | |
2912 | } | |
2913 | } | |
2914 | } | |
2915 | \f | |
2916 | /* Implement TARGET_UNWIND_WORD_MODE. | |
2917 | ||
2918 | Since PRU is really a 32-bit CPU, the default word_mode is not suitable. */ | |
2919 | static scalar_int_mode | |
2920 | pru_unwind_word_mode (void) | |
2921 | { | |
2922 | return SImode; | |
2923 | } | |
2924 | \f | |
2925 | ||
2926 | /* Initialize the GCC target structure. */ | |
2927 | #undef TARGET_ASM_FUNCTION_PROLOGUE | |
2928 | #define TARGET_ASM_FUNCTION_PROLOGUE pru_asm_function_prologue | |
2929 | #undef TARGET_ASM_INTEGER | |
2930 | #define TARGET_ASM_INTEGER pru_assemble_integer | |
2931 | ||
2932 | #undef TARGET_ASM_FILE_START | |
2933 | #define TARGET_ASM_FILE_START pru_file_start | |
2934 | ||
2935 | #undef TARGET_INIT_BUILTINS | |
2936 | #define TARGET_INIT_BUILTINS pru_init_builtins | |
2937 | #undef TARGET_EXPAND_BUILTIN | |
2938 | #define TARGET_EXPAND_BUILTIN pru_expand_builtin | |
2939 | #undef TARGET_BUILTIN_DECL | |
2940 | #define TARGET_BUILTIN_DECL pru_builtin_decl | |
2941 | ||
2942 | #undef TARGET_COMPUTE_FRAME_LAYOUT | |
2943 | #define TARGET_COMPUTE_FRAME_LAYOUT pru_compute_frame_layout | |
2944 | ||
2945 | #undef TARGET_FUNCTION_OK_FOR_SIBCALL | |
2946 | #define TARGET_FUNCTION_OK_FOR_SIBCALL hook_bool_tree_tree_true | |
2947 | ||
2948 | #undef TARGET_CAN_ELIMINATE | |
2949 | #define TARGET_CAN_ELIMINATE pru_can_eliminate | |
2950 | ||
2951 | #undef TARGET_HARD_REGNO_MODE_OK | |
2952 | #define TARGET_HARD_REGNO_MODE_OK pru_hard_regno_mode_ok | |
2953 | ||
2954 | #undef TARGET_HARD_REGNO_SCRATCH_OK | |
2955 | #define TARGET_HARD_REGNO_SCRATCH_OK pru_hard_regno_scratch_ok | |
2956 | #undef TARGET_HARD_REGNO_CALL_PART_CLOBBERED | |
2957 | #define TARGET_HARD_REGNO_CALL_PART_CLOBBERED \ | |
2958 | pru_hard_regno_call_part_clobbered | |
2959 | ||
2960 | #undef TARGET_FUNCTION_ARG | |
2961 | #define TARGET_FUNCTION_ARG pru_function_arg | |
2962 | ||
2963 | #undef TARGET_FUNCTION_ARG_ADVANCE | |
2964 | #define TARGET_FUNCTION_ARG_ADVANCE pru_function_arg_advance | |
2965 | ||
2966 | #undef TARGET_ARG_PARTIAL_BYTES | |
2967 | #define TARGET_ARG_PARTIAL_BYTES pru_arg_partial_bytes | |
2968 | ||
2969 | #undef TARGET_FUNCTION_VALUE | |
2970 | #define TARGET_FUNCTION_VALUE pru_function_value | |
2971 | ||
2972 | #undef TARGET_LIBCALL_VALUE | |
2973 | #define TARGET_LIBCALL_VALUE pru_libcall_value | |
2974 | ||
2975 | #undef TARGET_FUNCTION_VALUE_REGNO_P | |
2976 | #define TARGET_FUNCTION_VALUE_REGNO_P pru_function_value_regno_p | |
2977 | ||
2978 | #undef TARGET_RETURN_IN_MEMORY | |
2979 | #define TARGET_RETURN_IN_MEMORY pru_return_in_memory | |
2980 | ||
2981 | #undef TARGET_MUST_PASS_IN_STACK | |
2982 | #define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size | |
2983 | ||
2984 | #undef TARGET_LEGITIMATE_ADDRESS_P | |
2985 | #define TARGET_LEGITIMATE_ADDRESS_P pru_legitimate_address_p | |
2986 | ||
2987 | #undef TARGET_INIT_LIBFUNCS | |
2988 | #define TARGET_INIT_LIBFUNCS pru_init_libfuncs | |
2989 | #undef TARGET_LIBFUNC_GNU_PREFIX | |
2990 | #define TARGET_LIBFUNC_GNU_PREFIX true | |
2991 | ||
2992 | #undef TARGET_RTX_COSTS | |
2993 | #define TARGET_RTX_COSTS pru_rtx_costs | |
2994 | ||
2995 | #undef TARGET_PRINT_OPERAND | |
2996 | #define TARGET_PRINT_OPERAND pru_print_operand | |
2997 | ||
2998 | #undef TARGET_PRINT_OPERAND_ADDRESS | |
2999 | #define TARGET_PRINT_OPERAND_ADDRESS pru_print_operand_address | |
3000 | ||
3001 | #undef TARGET_OPTION_OVERRIDE | |
3002 | #define TARGET_OPTION_OVERRIDE pru_option_override | |
3003 | ||
3004 | #undef TARGET_SET_CURRENT_FUNCTION | |
3005 | #define TARGET_SET_CURRENT_FUNCTION pru_set_current_function | |
3006 | ||
3007 | #undef TARGET_MACHINE_DEPENDENT_REORG | |
3008 | #define TARGET_MACHINE_DEPENDENT_REORG pru_reorg | |
3009 | ||
3010 | #undef TARGET_CAN_USE_DOLOOP_P | |
3011 | #define TARGET_CAN_USE_DOLOOP_P pru_can_use_doloop_p | |
3012 | ||
3013 | #undef TARGET_INVALID_WITHIN_DOLOOP | |
3014 | #define TARGET_INVALID_WITHIN_DOLOOP pru_invalid_within_doloop | |
3015 | ||
3016 | #undef TARGET_UNWIND_WORD_MODE | |
3017 | #define TARGET_UNWIND_WORD_MODE pru_unwind_word_mode | |
3018 | ||
3019 | #undef TARGET_HAVE_SPECULATION_SAFE_VALUE | |
3020 | #define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed | |
3021 | ||
3022 | struct gcc_target targetm = TARGET_INITIALIZER; | |
3023 | ||
3024 | #include "gt-pru.h" |