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fef939d6 JB |
1 | /* Target Code for ft32 |
2 | Copyright (C) 2015 Free Software Foundation | |
3 | Contributed by FTDI <support@ftdi.com> | |
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 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
c7131fb2 | 24 | #include "backend.h" |
e11c4407 | 25 | #include "target.h" |
fef939d6 | 26 | #include "rtl.h" |
e11c4407 | 27 | #include "tree.h" |
c7131fb2 | 28 | #include "df.h" |
e11c4407 | 29 | #include "tm_p.h" |
fef939d6 | 30 | #include "regs.h" |
e11c4407 | 31 | #include "emit-rtl.h" |
fef939d6 | 32 | #include "diagnostic-core.h" |
e11c4407 | 33 | #include "output.h" |
fef939d6 JB |
34 | #include "stor-layout.h" |
35 | #include "calls.h" | |
36 | #include "expr.h" | |
fef939d6 | 37 | #include "builtins.h" |
fef939d6 | 38 | |
994c5d85 RS |
39 | /* This file should be included last. */ |
40 | #include "target-def.h" | |
41 | ||
fef939d6 JB |
42 | #include <stdint.h> |
43 | ||
44 | #define LOSE_AND_RETURN(msgid, x) \ | |
45 | do \ | |
46 | { \ | |
47 | ft32_operand_lossage (msgid, x); \ | |
48 | return; \ | |
49 | } while (0) | |
50 | ||
51 | /* Worker function for TARGET_RETURN_IN_MEMORY. */ | |
52 | ||
53 | static bool | |
54 | ft32_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED) | |
55 | { | |
56 | const HOST_WIDE_INT size = int_size_in_bytes (type); | |
57 | return (size == -1 || size > 2 * UNITS_PER_WORD); | |
58 | } | |
59 | ||
60 | /* Define how to find the value returned by a function. | |
61 | VALTYPE is the data type of the value (as a tree). | |
62 | If the precise function being called is known, FUNC is its | |
63 | FUNCTION_DECL; otherwise, FUNC is 0. | |
64 | ||
65 | We always return values in register $r0 for ft32. */ | |
66 | ||
67 | static rtx | |
68 | ft32_function_value (const_tree valtype, | |
69 | const_tree fntype_or_decl ATTRIBUTE_UNUSED, | |
70 | bool outgoing ATTRIBUTE_UNUSED) | |
71 | { | |
72 | return gen_rtx_REG (TYPE_MODE (valtype), FT32_R0); | |
73 | } | |
74 | ||
75 | /* Define how to find the value returned by a library function. | |
76 | ||
77 | We always return values in register $r0 for ft32. */ | |
78 | ||
79 | static rtx | |
80 | ft32_libcall_value (enum machine_mode mode, const_rtx fun ATTRIBUTE_UNUSED) | |
81 | { | |
82 | return gen_rtx_REG (mode, FT32_R0); | |
83 | } | |
84 | ||
85 | /* Handle TARGET_FUNCTION_VALUE_REGNO_P. | |
86 | ||
87 | We always return values in register $r0 for ft32. */ | |
88 | ||
89 | static bool | |
90 | ft32_function_value_regno_p (const unsigned int regno) | |
91 | { | |
92 | return (regno == FT32_R0); | |
93 | } | |
94 | ||
95 | /* Emit an error message when we're in an asm, and a fatal error for | |
96 | "normal" insns. Formatted output isn't easily implemented, since we | |
97 | use output_operand_lossage to output the actual message and handle the | |
98 | categorization of the error. */ | |
99 | ||
100 | static void | |
101 | ft32_operand_lossage (const char *msgid, rtx op) | |
102 | { | |
103 | debug_rtx (op); | |
104 | output_operand_lossage ("%s", msgid); | |
105 | } | |
106 | ||
107 | /* The PRINT_OPERAND_ADDRESS worker. */ | |
108 | ||
109 | void | |
110 | ft32_print_operand_address (FILE * file, rtx x) | |
111 | { | |
112 | switch (GET_CODE (x)) | |
113 | { | |
114 | case REG: | |
115 | fprintf (file, "%s,0", reg_names[REGNO (x)]); | |
116 | break; | |
117 | ||
118 | case PLUS: | |
119 | switch (GET_CODE (XEXP (x, 1))) | |
120 | { | |
121 | case CONST_INT: | |
122 | fprintf (file, "%s,%ld", | |
123 | reg_names[REGNO (XEXP (x, 0))], INTVAL (XEXP (x, 1))); | |
124 | break; | |
125 | case SYMBOL_REF: | |
126 | output_addr_const (file, XEXP (x, 1)); | |
127 | fprintf (file, "(%s)", reg_names[REGNO (XEXP (x, 0))]); | |
128 | break; | |
129 | case CONST: | |
130 | { | |
131 | rtx plus = XEXP (XEXP (x, 1), 0); | |
132 | if (GET_CODE (XEXP (plus, 0)) == SYMBOL_REF | |
133 | && CONST_INT_P (XEXP (plus, 1))) | |
134 | { | |
135 | output_addr_const (file, XEXP (plus, 0)); | |
136 | fprintf (file, "+%ld(%s)", INTVAL (XEXP (plus, 1)), | |
137 | reg_names[REGNO (XEXP (x, 0))]); | |
138 | } | |
139 | else | |
140 | abort (); | |
141 | } | |
142 | break; | |
143 | default: | |
144 | abort (); | |
145 | } | |
146 | break; | |
147 | ||
148 | default: | |
149 | output_addr_const (file, x); | |
150 | break; | |
151 | } | |
152 | } | |
153 | ||
154 | /* The PRINT_OPERAND worker. */ | |
155 | ||
156 | void | |
157 | ft32_print_operand (FILE * file, rtx x, int code) | |
158 | { | |
159 | rtx operand = x; | |
160 | ||
161 | /* New code entries should just be added to the switch below. If | |
162 | handling is finished, just return. If handling was just a | |
163 | modification of the operand, the modified operand should be put in | |
164 | "operand", and then do a break to let default handling | |
165 | (zero-modifier) output the operand. */ | |
166 | ||
167 | switch (code) | |
168 | { | |
169 | case 0: | |
170 | /* No code, print as usual. */ | |
171 | break; | |
172 | ||
173 | case 'h': | |
174 | if (GET_CODE (operand) != REG) | |
175 | internal_error ("'h' applied to non-register operand"); | |
176 | fprintf (file, "%s", reg_names[REGNO (operand) + 1]); | |
177 | return; | |
178 | ||
179 | case 'm': | |
ed1332ee | 180 | fprintf (file, "%ld", (long) (- INTVAL(x))); |
fef939d6 JB |
181 | return; |
182 | ||
183 | case 'd': // a DW spec, from an integer alignment (for BLKmode insns) | |
184 | { | |
185 | int i = INTVAL (x); | |
186 | char dwspec; | |
187 | switch (i) | |
188 | { | |
189 | case 1: | |
190 | dwspec = 'b'; | |
191 | break; | |
192 | case 2: | |
193 | dwspec = 's'; | |
194 | break; | |
195 | case 4: | |
196 | dwspec = 'l'; | |
197 | break; | |
198 | default: | |
199 | if ((i % 4) != 0) | |
200 | internal_error ("bad alignment: %d", i); | |
201 | else | |
202 | dwspec = 'l'; | |
203 | break; | |
204 | } | |
205 | fprintf (file, "%c", dwspec); | |
206 | return; | |
207 | } | |
208 | ||
209 | case 'f': | |
210 | { | |
211 | int bf = ft32_as_bitfield (INTVAL (x)); | |
212 | fprintf (file, "512|(%d<<5)|%d", bf >> 5, bf & 31); | |
213 | return; | |
214 | } | |
215 | ||
216 | case 'g': | |
217 | { | |
218 | int bf = ft32_as_bitfield (0xffffffff ^ INTVAL (x)); | |
219 | fprintf (file, "(%d<<5)|%d", bf >> 5, bf & 31); | |
220 | return; | |
221 | } | |
222 | ||
223 | case 'b': | |
224 | { | |
225 | ft32_print_operand (file, XEXP (x, 0), 0); | |
226 | return; | |
227 | } | |
228 | ||
229 | default: | |
230 | LOSE_AND_RETURN ("invalid operand modifier letter", x); | |
231 | } | |
232 | ||
233 | /* Print an operand as without a modifier letter. */ | |
234 | switch (GET_CODE (operand)) | |
235 | { | |
236 | case REG: | |
237 | fprintf (file, "%s", reg_names[REGNO (operand)]); | |
238 | return; | |
239 | ||
240 | case MEM: | |
241 | output_address (XEXP (operand, 0)); | |
242 | return; | |
243 | ||
244 | default: | |
245 | /* No need to handle all strange variants, let output_addr_const | |
246 | do it for us. */ | |
247 | if (CONSTANT_P (operand)) | |
248 | { | |
249 | output_addr_const (file, operand); | |
250 | return; | |
251 | } | |
252 | ||
253 | LOSE_AND_RETURN ("unexpected operand", x); | |
254 | } | |
255 | } | |
256 | ||
257 | const char * | |
258 | ft32_load_immediate (rtx dst, int32_t i) | |
259 | { | |
260 | char pattern[100]; | |
261 | ||
262 | if ((-524288 <= i) && (i <= 524287)) | |
263 | { | |
264 | sprintf (pattern, "ldk.l %%0,%d", i); | |
265 | output_asm_insn (pattern, &dst); | |
266 | } | |
267 | else if ((-536870912 <= i) && (i <= 536870911)) | |
268 | { | |
269 | ft32_load_immediate (dst, i >> 10); | |
270 | sprintf (pattern, "ldl.l %%0,%%0,%d", i & 1023); | |
271 | output_asm_insn (pattern, &dst); | |
272 | } | |
273 | else | |
274 | { | |
275 | int rd; // rotate distance | |
276 | uint32_t u = i; | |
277 | for (rd = 1; rd < 32; rd++) | |
278 | { | |
279 | u = ((u >> 31) & 1) | (u << 1); | |
280 | if ((-524288 <= (int32_t) u) && ((int32_t) u <= 524287)) | |
281 | { | |
282 | ft32_load_immediate (dst, (int32_t) u); | |
283 | sprintf (pattern, "ror.l %%0,%%0,%d", rd); | |
284 | output_asm_insn (pattern, &dst); | |
285 | return ""; | |
286 | } | |
287 | } | |
288 | ft32_load_immediate (dst, i >> 10); | |
289 | sprintf (pattern, "ldl.l %%0,%%0,%d", i & 1023); | |
290 | output_asm_insn (pattern, &dst); | |
291 | } | |
292 | ||
293 | return ""; | |
294 | } | |
295 | ||
296 | // x is a bit mask, for example: | |
297 | // 00000000000000000000001111111110 | |
298 | // If x contains a single bit mask, return the bitfield spec. | |
299 | // in the above case it returns ((9 << 5) | 1) | |
300 | // Otherwise return -1. | |
301 | // | |
302 | ||
303 | #define NBITS(n) ((1U << (n)) - 1U) | |
304 | ||
305 | int | |
306 | ft32_as_bitfield (unsigned int x) | |
307 | { | |
308 | int lobit, hibit; | |
309 | ||
310 | if (x == 0) | |
311 | return -1; | |
312 | ||
313 | for (lobit = 0; lobit < 32; lobit++) | |
314 | if (x & (1 << lobit)) | |
315 | break; | |
316 | for (hibit = 31; hibit >= 0; hibit--) | |
317 | if (x & (1 << hibit)) | |
318 | break; | |
319 | ||
320 | int width = 1 + hibit - lobit; | |
321 | if (width > 16) | |
322 | return -1; | |
323 | ||
324 | if (x != (NBITS (width) << lobit)) | |
325 | return -1; // not a clean bitfield | |
326 | ||
327 | return ((width & 15) << 5) | lobit; | |
328 | } | |
329 | ||
330 | /* Per-function machine data. */ | |
331 | struct GTY (()) machine_function | |
332 | { | |
333 | /* Number of bytes saved on the stack for callee saved registers. */ | |
334 | int callee_saved_reg_size; | |
335 | ||
336 | /* Number of bytes saved on the stack for local variables. */ | |
337 | int local_vars_size; | |
338 | ||
339 | /* The sum of 2 sizes: locals vars and padding byte for saving the | |
340 | * registers. Used in expand_prologue () and expand_epilogue (). */ | |
341 | int size_for_adjusting_sp; | |
342 | }; | |
343 | ||
344 | /* Zero initialization is OK for all current fields. */ | |
345 | ||
346 | static struct machine_function * | |
347 | ft32_init_machine_status (void) | |
348 | { | |
349 | return ggc_cleared_alloc < machine_function > (); | |
350 | } | |
351 | ||
352 | ||
353 | /* The TARGET_OPTION_OVERRIDE worker. | |
354 | All this curently does is set init_machine_status. */ | |
355 | static void | |
356 | ft32_option_override (void) | |
357 | { | |
358 | /* Set the per-function-data initializer. */ | |
359 | init_machine_status = ft32_init_machine_status; | |
360 | } | |
361 | ||
362 | /* Implement targetm.select_section. */ | |
363 | static section * | |
364 | ft32_select_section (tree decl, int reloc, unsigned HOST_WIDE_INT align) | |
365 | { | |
366 | /* Variables and constants defined in the __ea address space | |
367 | go into a special section named "._ea". */ | |
368 | if (TREE_TYPE (decl) != error_mark_node | |
369 | && TYPE_ADDR_SPACE (TREE_TYPE (decl)) == ADDR_SPACE_PM) | |
370 | { | |
371 | /* We might get called with string constants, but get_named_section | |
372 | doesn't like them as they are not DECLs. Also, we need to set | |
373 | flags in that case. */ | |
374 | if (!DECL_P (decl)) | |
375 | return get_section ("._pm", SECTION_WRITE | SECTION_DEBUG, NULL); | |
376 | ||
377 | return get_named_section (decl, "._pm", reloc); | |
378 | } | |
379 | ||
380 | return default_elf_select_section (decl, reloc, align); | |
381 | } | |
382 | ||
383 | /* Compute the size of the local area and the size to be adjusted by the | |
384 | * prologue and epilogue. */ | |
385 | ||
386 | static void | |
387 | ft32_compute_frame (void) | |
388 | { | |
389 | /* For aligning the local variables. */ | |
390 | int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT; | |
391 | int padding_locals; | |
392 | int regno; | |
393 | ||
394 | /* Padding needed for each element of the frame. */ | |
395 | cfun->machine->local_vars_size = get_frame_size (); | |
396 | ||
397 | /* Align to the stack alignment. */ | |
398 | padding_locals = cfun->machine->local_vars_size % stack_alignment; | |
399 | if (padding_locals) | |
400 | padding_locals = stack_alignment - padding_locals; | |
401 | ||
402 | cfun->machine->local_vars_size += padding_locals; | |
403 | ||
404 | cfun->machine->callee_saved_reg_size = 0; | |
405 | ||
406 | /* Save callee-saved registers. */ | |
407 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
408 | if (df_regs_ever_live_p (regno) && (!call_used_regs[regno])) | |
409 | cfun->machine->callee_saved_reg_size += 4; | |
410 | ||
411 | cfun->machine->size_for_adjusting_sp = | |
412 | crtl->args.pretend_args_size | |
413 | + cfun->machine->local_vars_size | |
414 | + (ACCUMULATE_OUTGOING_ARGS ? crtl->outgoing_args_size : 0); | |
415 | } | |
416 | ||
417 | // Must use LINK/UNLINK when... | |
418 | // the frame is bigger than 512 bytes so cannot just "SUB" from SP | |
419 | // the function actually uses $fp | |
420 | ||
421 | static int | |
422 | must_link (void) | |
423 | { | |
424 | int bigframe = (cfun->machine->size_for_adjusting_sp >= 512); | |
425 | return (bigframe || frame_pointer_needed || df_regs_ever_live_p (FT32_FP) | |
426 | || df_regs_ever_live_p (FT32_FP)); | |
427 | } | |
428 | ||
429 | void | |
430 | ft32_expand_prologue (void) | |
431 | { | |
432 | int regno; | |
433 | rtx insn; | |
434 | ||
435 | ft32_compute_frame (); | |
436 | ||
ed1332ee NC |
437 | if (flag_stack_usage_info) |
438 | current_function_static_stack_size = cfun->machine->size_for_adjusting_sp; | |
439 | ||
fef939d6 JB |
440 | if (!must_link () && (cfun->machine->callee_saved_reg_size == 4)) |
441 | { | |
442 | insn = | |
443 | emit_insn (gen_link | |
444 | (gen_rtx_REG (Pmode, FT32_R13), | |
445 | GEN_INT (-cfun->machine->size_for_adjusting_sp))); | |
446 | RTX_FRAME_RELATED_P (insn) = 1; | |
447 | return; | |
448 | } | |
449 | /* Save callee-saved registers. */ | |
450 | if (optimize_size) | |
451 | { | |
452 | for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0;) | |
453 | { | |
454 | if (!fixed_regs[regno] && !call_used_regs[regno] | |
455 | && df_regs_ever_live_p (regno)) | |
456 | { | |
457 | rtx preg = gen_rtx_REG (Pmode, regno); | |
458 | emit_insn (gen_call_prolog (preg)); | |
459 | break; | |
460 | } | |
461 | } | |
462 | } | |
463 | else | |
464 | { | |
465 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
466 | { | |
467 | if (!fixed_regs[regno] && df_regs_ever_live_p (regno) | |
468 | && !call_used_regs[regno]) | |
469 | { | |
470 | insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno))); | |
471 | RTX_FRAME_RELATED_P (insn) = 1; | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
476 | if (65536 <= cfun->machine->size_for_adjusting_sp) | |
477 | { | |
478 | error ("stack frame must be smaller than 64K"); | |
479 | return; | |
480 | } | |
481 | if (must_link ()) | |
482 | { | |
483 | insn = | |
484 | emit_insn (gen_link | |
485 | (gen_rtx_REG (Pmode, FT32_FP), | |
486 | GEN_INT (-cfun->machine->size_for_adjusting_sp))); | |
487 | RTX_FRAME_RELATED_P (insn) = 1; | |
488 | } | |
489 | else if (cfun->machine->size_for_adjusting_sp > 0) | |
490 | { | |
491 | insn = emit_insn (gen_addsi3 (gen_rtx_REG (SImode, FT32_SP), | |
492 | gen_rtx_REG (SImode, FT32_SP), | |
493 | GEN_INT (-(cfun->machine-> | |
494 | size_for_adjusting_sp)))); | |
495 | RTX_FRAME_RELATED_P (insn) = 1; | |
496 | } | |
497 | } | |
498 | ||
499 | void | |
500 | ft32_expand_epilogue (void) | |
501 | { | |
502 | int regno; | |
503 | ||
504 | if (!must_link () | |
505 | && (cfun->machine->size_for_adjusting_sp == 24) | |
506 | && (cfun->machine->callee_saved_reg_size == 0)) | |
507 | { | |
508 | emit_jump_insn (gen_returner24 ()); | |
509 | return; | |
510 | } | |
511 | ||
512 | // Set when the epilog code will also add 24 to $sp | |
513 | int epilog24 = (!must_link () | |
514 | && (cfun->machine->size_for_adjusting_sp == 24) | |
515 | && optimize_size); | |
516 | ||
517 | if (must_link ()) | |
518 | { | |
519 | emit_insn (gen_unlink ()); | |
520 | } | |
521 | else if (!epilog24 && (cfun->machine->size_for_adjusting_sp > 0)) | |
522 | { | |
523 | emit_insn (gen_addsi3 (gen_rtx_REG (SImode, FT32_SP), | |
524 | gen_rtx_REG (SImode, FT32_SP), | |
525 | GEN_INT (cfun->machine->size_for_adjusting_sp))); | |
526 | } | |
527 | ||
528 | if (cfun->machine->callee_saved_reg_size != 0) | |
529 | { | |
530 | for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0;) | |
531 | { | |
532 | if (!fixed_regs[regno] && !call_used_regs[regno] | |
533 | && df_regs_ever_live_p (regno)) | |
534 | { | |
535 | rtx preg = gen_rtx_REG (Pmode, regno); | |
536 | if (optimize_size) | |
537 | { | |
538 | if (epilog24) | |
539 | emit_insn (gen_jump_epilog24 (preg)); | |
540 | else | |
541 | emit_insn (gen_jump_epilog (preg)); | |
542 | return; | |
543 | } | |
544 | emit_insn (gen_movsi_pop (preg)); | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
549 | emit_jump_insn (gen_returner ()); | |
550 | } | |
551 | ||
552 | #undef TARGET_FRAME_POINTER_REQUIRED | |
553 | #define TARGET_FRAME_POINTER_REQUIRED ft32_frame_pointer_required | |
554 | static bool | |
555 | ft32_frame_pointer_required (void) | |
556 | { | |
557 | return cfun->calls_alloca; | |
558 | } | |
559 | ||
560 | #undef TARGET_CAN_ELIMINATE | |
561 | #define TARGET_CAN_ELIMINATE ft32_can_eliminate | |
562 | ||
563 | /* Return true if register FROM can be eliminated via register TO. */ | |
564 | ||
565 | static bool | |
566 | ft32_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) | |
567 | { | |
568 | return 1; | |
569 | return (to == FRAME_POINTER_REGNUM) || !ft32_frame_pointer_required (); | |
570 | } | |
571 | ||
572 | /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */ | |
573 | ||
574 | int | |
575 | ft32_initial_elimination_offset (int from, int to) | |
576 | { | |
577 | ft32_compute_frame (); | |
578 | ||
579 | if (from == ARG_POINTER_REGNUM && to == FRAME_POINTER_REGNUM) | |
580 | { | |
581 | return cfun->machine->callee_saved_reg_size + 2 * UNITS_PER_WORD; | |
582 | } | |
583 | ||
584 | if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM) | |
585 | { | |
586 | int arg_offset; | |
587 | arg_offset = must_link ()? 2 : 1; | |
588 | return ((cfun->machine->callee_saved_reg_size | |
589 | + arg_offset * UNITS_PER_WORD) | |
590 | + cfun->machine->size_for_adjusting_sp); | |
591 | } | |
592 | ||
593 | if ((from == FRAME_POINTER_REGNUM) && (to == STACK_POINTER_REGNUM)) | |
594 | { | |
595 | return cfun->machine->size_for_adjusting_sp; | |
596 | } | |
597 | ||
598 | gcc_unreachable (); | |
599 | } | |
600 | ||
601 | /* Worker function for TARGET_SETUP_INCOMING_VARARGS. */ | |
602 | ||
603 | static void | |
604 | ft32_setup_incoming_varargs (cumulative_args_t cum_v, | |
605 | enum machine_mode mode ATTRIBUTE_UNUSED, | |
606 | tree type ATTRIBUTE_UNUSED, | |
607 | int *pretend_size, int no_rtl) | |
608 | { | |
609 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
610 | int regno; | |
611 | int regs = 8 - *cum; | |
612 | ||
613 | *pretend_size = regs < 0 ? 0 : GET_MODE_SIZE (SImode) * regs; | |
614 | ||
615 | if (no_rtl) | |
616 | return; | |
617 | ||
618 | for (regno = *cum; regno < 8; regno++) | |
619 | { | |
620 | rtx reg = gen_rtx_REG (SImode, regno); | |
621 | rtx slot = gen_rtx_PLUS (Pmode, | |
622 | gen_rtx_REG (SImode, ARG_POINTER_REGNUM), | |
623 | GEN_INT (UNITS_PER_WORD * (regno - FT32_R0))); | |
624 | ||
625 | emit_move_insn (gen_rtx_MEM (SImode, slot), reg); | |
626 | } | |
627 | } | |
628 | ||
629 | ||
630 | /* Return the fixed registers used for condition codes. */ | |
631 | ||
632 | static bool | |
633 | ft32_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2) | |
634 | { | |
635 | *p1 = CC_REG; | |
636 | *p2 = INVALID_REGNUM; | |
637 | return true; | |
638 | } | |
639 | ||
640 | /* Return the next register to be used to hold a function argument or | |
641 | NULL_RTX if there's no more space. */ | |
642 | ||
643 | static rtx | |
644 | ft32_function_arg (cumulative_args_t cum_v, enum machine_mode mode, | |
645 | const_tree type ATTRIBUTE_UNUSED, | |
646 | bool named ATTRIBUTE_UNUSED) | |
647 | { | |
648 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
649 | ||
650 | if (*cum < 8) | |
651 | return gen_rtx_REG (mode, *cum); | |
652 | else | |
653 | return NULL_RTX; | |
654 | } | |
655 | ||
656 | #define FT32_FUNCTION_ARG_SIZE(MODE, TYPE) \ | |
657 | ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) \ | |
658 | : (unsigned) int_size_in_bytes (TYPE)) | |
659 | ||
660 | static void | |
661 | ft32_function_arg_advance (cumulative_args_t cum_v, enum machine_mode mode, | |
662 | const_tree type, bool named ATTRIBUTE_UNUSED) | |
663 | { | |
664 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
665 | ||
666 | *cum = (*cum < FT32_R6 | |
667 | ? *cum + ((3 + FT32_FUNCTION_ARG_SIZE (mode, type)) / 4) : *cum); | |
668 | } | |
669 | ||
670 | /* Return non-zero if the function argument described by TYPE is to be | |
671 | passed by reference. */ | |
672 | ||
673 | static bool | |
674 | ft32_pass_by_reference (cumulative_args_t cum ATTRIBUTE_UNUSED, | |
675 | enum machine_mode mode, const_tree type, | |
676 | bool named ATTRIBUTE_UNUSED) | |
677 | { | |
678 | unsigned HOST_WIDE_INT size; | |
679 | ||
680 | if (type) | |
681 | { | |
682 | if (AGGREGATE_TYPE_P (type)) | |
683 | return true; | |
684 | size = int_size_in_bytes (type); | |
685 | } | |
686 | else | |
687 | size = GET_MODE_SIZE (mode); | |
688 | ||
689 | return size > 4 * 6; | |
690 | } | |
691 | ||
692 | /* Some function arguments will only partially fit in the registers | |
693 | that hold arguments. Given a new arg, return the number of bytes | |
694 | that fit in argument passing registers. */ | |
695 | ||
696 | static int | |
697 | ft32_arg_partial_bytes (cumulative_args_t cum_v, | |
698 | enum machine_mode mode, tree type, bool named) | |
699 | { | |
700 | CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); | |
701 | int bytes_left, size; | |
702 | ||
703 | if (*cum >= 8) | |
704 | return 0; | |
705 | ||
706 | if (ft32_pass_by_reference (cum_v, mode, type, named)) | |
707 | size = 4; | |
708 | else if (type) | |
709 | { | |
710 | if (AGGREGATE_TYPE_P (type)) | |
711 | return 0; | |
712 | size = int_size_in_bytes (type); | |
713 | } | |
714 | else | |
715 | size = GET_MODE_SIZE (mode); | |
716 | ||
717 | bytes_left = (4 * 6) - ((*cum - 2) * 4); | |
718 | ||
719 | if (size > bytes_left) | |
720 | return bytes_left; | |
721 | else | |
722 | return 0; | |
723 | } | |
724 | ||
725 | /* Used by constraints.md to distinguish between GENERIC and PM | |
726 | memory addresses. */ | |
727 | ||
728 | int | |
729 | ft32_is_mem_pm (rtx o) | |
730 | { | |
a481f93b JB |
731 | return (MEM_P (o) |
732 | && !ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (o))); | |
fef939d6 JB |
733 | } |
734 | ||
735 | /* The Global `targetm' Variable. */ | |
736 | ||
737 | /* Initialize the GCC target structure. */ | |
738 | ||
739 | #undef TARGET_PROMOTE_PROTOTYPES | |
740 | #define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true | |
741 | ||
742 | #undef TARGET_RETURN_IN_MEMORY | |
743 | #define TARGET_RETURN_IN_MEMORY ft32_return_in_memory | |
744 | #undef TARGET_MUST_PASS_IN_STACK | |
745 | #define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size | |
746 | #undef TARGET_PASS_BY_REFERENCE | |
747 | #define TARGET_PASS_BY_REFERENCE ft32_pass_by_reference | |
748 | #undef TARGET_ARG_PARTIAL_BYTES | |
749 | #define TARGET_ARG_PARTIAL_BYTES ft32_arg_partial_bytes | |
750 | #undef TARGET_FUNCTION_ARG | |
751 | #define TARGET_FUNCTION_ARG ft32_function_arg | |
752 | #undef TARGET_FUNCTION_ARG_ADVANCE | |
753 | #define TARGET_FUNCTION_ARG_ADVANCE ft32_function_arg_advance | |
754 | ||
755 | ||
756 | #undef TARGET_SETUP_INCOMING_VARARGS | |
757 | #define TARGET_SETUP_INCOMING_VARARGS ft32_setup_incoming_varargs | |
758 | ||
759 | #undef TARGET_FIXED_CONDITION_CODE_REGS | |
760 | #define TARGET_FIXED_CONDITION_CODE_REGS ft32_fixed_condition_code_regs | |
761 | ||
762 | /* Define this to return an RTX representing the place where a | |
763 | function returns or receives a value of data type RET_TYPE, a tree | |
026c3cfd | 764 | node representing a data type. */ |
fef939d6 JB |
765 | #undef TARGET_FUNCTION_VALUE |
766 | #define TARGET_FUNCTION_VALUE ft32_function_value | |
767 | #undef TARGET_LIBCALL_VALUE | |
768 | #define TARGET_LIBCALL_VALUE ft32_libcall_value | |
769 | #undef TARGET_FUNCTION_VALUE_REGNO_P | |
770 | #define TARGET_FUNCTION_VALUE_REGNO_P ft32_function_value_regno_p | |
771 | ||
772 | #undef TARGET_OPTION_OVERRIDE | |
773 | #define TARGET_OPTION_OVERRIDE ft32_option_override | |
774 | ||
775 | #undef TARGET_ASM_SELECT_SECTION | |
776 | #define TARGET_ASM_SELECT_SECTION ft32_select_section | |
777 | ||
778 | #undef TARGET_VALID_POINTER_MODE | |
779 | #define TARGET_VALID_POINTER_MODE ft32_valid_pointer_mode | |
780 | static bool | |
781 | ft32_valid_pointer_mode (enum machine_mode mode) | |
782 | { | |
783 | if (mode == SImode) | |
784 | return 1; | |
785 | return 0; | |
786 | } | |
787 | ||
788 | #undef TARGET_ADDR_SPACE_POINTER_MODE | |
789 | #define TARGET_ADDR_SPACE_POINTER_MODE ft32_addr_space_pointer_mode | |
790 | static enum machine_mode | |
791 | ft32_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) | |
792 | { | |
793 | return Pmode; | |
794 | } | |
795 | ||
796 | #undef TARGET_ADDR_SPACE_ADDRESS_MODE | |
797 | #define TARGET_ADDR_SPACE_ADDRESS_MODE ft32_addr_space_address_mode | |
798 | static enum machine_mode | |
799 | ft32_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED) | |
800 | { | |
801 | return Pmode; | |
802 | } | |
803 | ||
804 | #undef TARGET_ADDR_SPACE_SUBSET_P | |
805 | #define TARGET_ADDR_SPACE_SUBSET_P ft32_addr_space_subset_p | |
806 | static bool | |
807 | ft32_addr_space_subset_p (addr_space_t subset ATTRIBUTE_UNUSED, | |
808 | addr_space_t superset ATTRIBUTE_UNUSED) | |
809 | { | |
810 | return false; | |
811 | } | |
812 | ||
813 | #undef TARGET_CASE_VALUES_THRESHOLD | |
814 | #define TARGET_CASE_VALUES_THRESHOLD ft32_target_case_values_threshold | |
815 | ||
816 | static unsigned int | |
817 | ft32_target_case_values_threshold (void) | |
818 | { | |
819 | return 4; | |
820 | } | |
821 | ||
822 | #undef TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P | |
823 | #define TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P \ | |
824 | ft32_addr_space_legitimate_address_p | |
825 | ||
826 | ||
827 | // Enabling LRA gives the infamous | |
828 | // internal compiler error: Max. number of generated reload insns per insn is achieved (90) | |
829 | // errors e.g. when compiling sieve.c | |
830 | ||
831 | static bool | |
832 | ft32_lra_p (void) | |
833 | { | |
834 | return ft32_lra_flag; | |
835 | } | |
836 | ||
837 | #undef TARGET_LRA_P | |
838 | #define TARGET_LRA_P ft32_lra_p | |
839 | ||
840 | static bool | |
841 | reg_ok_for_base_p (rtx r, bool strict) | |
842 | { | |
843 | int NUM = REGNO (r); | |
844 | if (strict) | |
845 | return (HARD_REGNO_OK_FOR_BASE_P (NUM) | |
846 | || HARD_REGNO_OK_FOR_BASE_P (reg_renumber[(NUM)])); | |
847 | else | |
848 | return ((NUM) >= FIRST_PSEUDO_REGISTER || HARD_REGNO_OK_FOR_BASE_P (NUM)); | |
849 | } | |
850 | ||
851 | static bool | |
852 | ft32_addr_space_legitimate_address_p (enum machine_mode mode, rtx x, | |
853 | bool strict, | |
854 | addr_space_t as ATTRIBUTE_UNUSED) | |
855 | { | |
856 | if (mode != BLKmode) | |
857 | { | |
858 | if (GET_CODE (x) == PLUS) | |
859 | { | |
860 | rtx op1, op2; | |
861 | op1 = XEXP (x, 0); | |
862 | op2 = XEXP (x, 1); | |
863 | if (GET_CODE (op1) == REG | |
864 | && CONST_INT_P (op2) | |
865 | && INTVAL (op2) >= -128 | |
866 | && INTVAL (op2) < 128 && reg_ok_for_base_p (op1, strict)) | |
867 | goto yes; | |
868 | if (GET_CODE (op1) == SYMBOL_REF && CONST_INT_P (op2)) | |
869 | goto yes; | |
870 | } | |
871 | if (REG_P (x) && reg_ok_for_base_p (x, strict)) | |
872 | goto yes; | |
873 | if (GET_CODE (x) == SYMBOL_REF | |
874 | || GET_CODE (x) == LABEL_REF || CONST_INT_P (x)) | |
875 | goto yes; | |
876 | } | |
877 | else | |
878 | { | |
879 | if (REG_P (x) && reg_ok_for_base_p (x, strict)) | |
880 | goto yes; | |
881 | } | |
882 | ||
883 | return 0; | |
884 | yes: | |
885 | return 1; | |
886 | } | |
887 | ||
888 | struct gcc_target targetm = TARGET_INITIALIZER; | |
889 | ||
890 | #include "gt-ft32.h" |