1 /* FR30 specific functions. 2 Copyright (C) 1998-2015 Free Software Foundation, Inc. 3 Contributed by Cygnus Solutions. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public 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 /*{{{ Includes */ 22 23 #include "config.h" 24 #include "system.h" 25 #include "coretypes.h" 26 #include "tm.h" 27 #include "rtl.h" 28 #include "regs.h" 29 #include "hard-reg-set.h" 30 #include "insn-config.h" 31 #include "conditions.h" 32 #include "insn-attr.h" 33 #include "flags.h" 34 #include "recog.h" 35 #include "hash-set.h" 36 #include "machmode.h" 37 #include "vec.h" 38 #include "double-int.h" 39 #include "input.h" 40 #include "alias.h" 41 #include "symtab.h" 42 #include "wide-int.h" 43 #include "inchash.h" 44 #include "tree.h" 45 #include "fold-const.h" 46 #include "stor-layout.h" 47 #include "varasm.h" 48 #include "output.h" 49 #include "hashtab.h" 50 #include "function.h" 51 #include "statistics.h" 52 #include "real.h" 53 #include "fixed-value.h" 54 #include "expmed.h" 55 #include "dojump.h" 56 #include "explow.h" 57 #include "calls.h" 58 #include "emit-rtl.h" 59 #include "stmt.h" 60 #include "expr.h" 61 #include "obstack.h" 62 #include "except.h" 63 #include "dominance.h" 64 #include "cfg.h" 65 #include "cfgrtl.h" 66 #include "cfganal.h" 67 #include "lcm.h" 68 #include "cfgbuild.h" 69 #include "cfgcleanup.h" 70 #include "predict.h" 71 #include "basic-block.h" 72 #include "df.h" 73 #include "diagnostic-core.h" 74 #include "tm_p.h" 75 #include "target.h" 76 #include "target-def.h" 77 #include "builtins.h" 78 79 /*}}}*/ 80 /*{{{ Function Prologues & Epilogues */ 81 82 /* The FR30 stack looks like this: 83 84 Before call After call 85 FP ->| | | | 86 +-----------------------+ +-----------------------+ high 87 | | | | memory 88 | local variables, | | local variables, | 89 | reg save area, etc. | | reg save area, etc. | 90 | | | | 91 +-----------------------+ +-----------------------+ 92 | | | | 93 | args to the func that | | args to this func. | 94 | is being called that | | | 95 SP ->| do not fit in regs | | | 96 +-----------------------+ +-----------------------+ 97 | args that used to be | \ 98 | in regs; only created | | pretend_size 99 AP-> | for vararg funcs | / 100 +-----------------------+ 101 | | \ 102 | register save area | | 103 | | | 104 +-----------------------+ | reg_size 105 | return address | | 106 +-----------------------+ | 107 FP ->| previous frame ptr | / 108 +-----------------------+ 109 | | \ 110 | local variables | | var_size 111 | | / 112 +-----------------------+ 113 | | \ 114 low | room for args to | | 115 memory | other funcs called | | args_size 116 | from this one | | 117 SP ->| | / 118 +-----------------------+ 119 120 Note, AP is a fake hard register. It will be eliminated in favor of 121 SP or FP as appropriate. 122 123 Note, Some or all of the stack sections above may be omitted if they 124 are not needed. */ 125 126 /* Structure to be filled in by fr30_compute_frame_size() with register 127 save masks, and offsets for the current function. */ 128 struct fr30_frame_info 129 { 130 unsigned int total_size; /* # Bytes that the entire frame takes up. */ 131 unsigned int pretend_size; /* # Bytes we push and pretend caller did. */ 132 unsigned int args_size; /* # Bytes that outgoing arguments take up. */ 133 unsigned int reg_size; /* # Bytes needed to store regs. */ 134 unsigned int var_size; /* # Bytes that variables take up. */ 135 unsigned int frame_size; /* # Bytes in current frame. */ 136 unsigned int gmask; /* Mask of saved registers. */ 137 unsigned int save_fp; /* Nonzero if frame pointer must be saved. */ 138 unsigned int save_rp; /* Nonzero if return pointer must be saved. */ 139 int initialised; /* Nonzero if frame size already calculated. */ 140 }; 141 142 /* Current frame information calculated by fr30_compute_frame_size(). */ 143 static struct fr30_frame_info current_frame_info; 144 145 /* Zero structure to initialize current_frame_info. */ 146 static struct fr30_frame_info zero_frame_info; 147 148 static void fr30_setup_incoming_varargs (cumulative_args_t, machine_mode, 149 tree, int *, int); 150 static bool fr30_must_pass_in_stack (machine_mode, const_tree); 151 static int fr30_arg_partial_bytes (cumulative_args_t, machine_mode, 152 tree, bool); 153 static rtx fr30_function_arg (cumulative_args_t, machine_mode, 154 const_tree, bool); 155 static void fr30_function_arg_advance (cumulative_args_t, machine_mode, 156 const_tree, bool); 157 static bool fr30_frame_pointer_required (void); 158 static rtx fr30_function_value (const_tree, const_tree, bool); 159 static rtx fr30_libcall_value (machine_mode, const_rtx); 160 static bool fr30_function_value_regno_p (const unsigned int); 161 static bool fr30_can_eliminate (const int, const int); 162 static void fr30_asm_trampoline_template (FILE *); 163 static void fr30_trampoline_init (rtx, tree, rtx); 164 static int fr30_num_arg_regs (machine_mode, const_tree); 165 166 #define FRAME_POINTER_MASK (1 << (FRAME_POINTER_REGNUM)) 167 #define RETURN_POINTER_MASK (1 << (RETURN_POINTER_REGNUM)) 168 169 /* Tell prologue and epilogue if register REGNO should be saved / restored. 170 The return address and frame pointer are treated separately. 171 Don't consider them here. */ 172 #define MUST_SAVE_REGISTER(regno) \ 173 ( (regno) != RETURN_POINTER_REGNUM \ 174 && (regno) != FRAME_POINTER_REGNUM \ 175 && df_regs_ever_live_p (regno) \ 176 && ! call_used_regs [regno] ) 177 178 #define MUST_SAVE_FRAME_POINTER (df_regs_ever_live_p (FRAME_POINTER_REGNUM) || frame_pointer_needed) 179 #define MUST_SAVE_RETURN_POINTER (df_regs_ever_live_p (RETURN_POINTER_REGNUM) || crtl->profile) 180 181 #if UNITS_PER_WORD == 4 182 #define WORD_ALIGN(SIZE) (((SIZE) + 3) & ~3) 183 #endif 184 185 /* Initialize the GCC target structure. */ 186 #undef TARGET_ASM_ALIGNED_HI_OP 187 #define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t" 188 #undef TARGET_ASM_ALIGNED_SI_OP 189 #define TARGET_ASM_ALIGNED_SI_OP "\t.word\t" 190 191 #undef TARGET_PROMOTE_PROTOTYPES 192 #define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true 193 #undef TARGET_PASS_BY_REFERENCE 194 #define TARGET_PASS_BY_REFERENCE hook_pass_by_reference_must_pass_in_stack 195 #undef TARGET_ARG_PARTIAL_BYTES 196 #define TARGET_ARG_PARTIAL_BYTES fr30_arg_partial_bytes 197 #undef TARGET_FUNCTION_ARG 198 #define TARGET_FUNCTION_ARG fr30_function_arg 199 #undef TARGET_FUNCTION_ARG_ADVANCE 200 #define TARGET_FUNCTION_ARG_ADVANCE fr30_function_arg_advance 201 202 #undef TARGET_FUNCTION_VALUE 203 #define TARGET_FUNCTION_VALUE fr30_function_value 204 #undef TARGET_LIBCALL_VALUE 205 #define TARGET_LIBCALL_VALUE fr30_libcall_value 206 #undef TARGET_FUNCTION_VALUE_REGNO_P 207 #define TARGET_FUNCTION_VALUE_REGNO_P fr30_function_value_regno_p 208 209 #undef TARGET_SETUP_INCOMING_VARARGS 210 #define TARGET_SETUP_INCOMING_VARARGS fr30_setup_incoming_varargs 211 #undef TARGET_MUST_PASS_IN_STACK 212 #define TARGET_MUST_PASS_IN_STACK fr30_must_pass_in_stack 213 214 #undef TARGET_FRAME_POINTER_REQUIRED 215 #define TARGET_FRAME_POINTER_REQUIRED fr30_frame_pointer_required 216 217 #undef TARGET_CAN_ELIMINATE 218 #define TARGET_CAN_ELIMINATE fr30_can_eliminate 219 220 #undef TARGET_ASM_TRAMPOLINE_TEMPLATE 221 #define TARGET_ASM_TRAMPOLINE_TEMPLATE fr30_asm_trampoline_template 222 #undef TARGET_TRAMPOLINE_INIT 223 #define TARGET_TRAMPOLINE_INIT fr30_trampoline_init 224 225 struct gcc_target targetm = TARGET_INITIALIZER; 226 227 228 /* Worker function for TARGET_CAN_ELIMINATE. */ 229 230 bool 231 fr30_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) 232 { 233 return (to == FRAME_POINTER_REGNUM || ! frame_pointer_needed); 234 } 235 236 /* Returns the number of bytes offset between FROM_REG and TO_REG 237 for the current function. As a side effect it fills in the 238 current_frame_info structure, if the data is available. */ 239 unsigned int 240 fr30_compute_frame_size (int from_reg, int to_reg) 241 { 242 int regno; 243 unsigned int return_value; 244 unsigned int var_size; 245 unsigned int args_size; 246 unsigned int pretend_size; 247 unsigned int reg_size; 248 unsigned int gmask; 249 250 var_size = WORD_ALIGN (get_frame_size ()); 251 args_size = WORD_ALIGN (crtl->outgoing_args_size); 252 pretend_size = crtl->args.pretend_args_size; 253 254 reg_size = 0; 255 gmask = 0; 256 257 /* Calculate space needed for registers. */ 258 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno ++) 259 { 260 if (MUST_SAVE_REGISTER (regno)) 261 { 262 reg_size += UNITS_PER_WORD; 263 gmask |= 1 << regno; 264 } 265 } 266 267 current_frame_info.save_fp = MUST_SAVE_FRAME_POINTER; 268 current_frame_info.save_rp = MUST_SAVE_RETURN_POINTER; 269 270 reg_size += (current_frame_info.save_fp + current_frame_info.save_rp) 271 * UNITS_PER_WORD; 272 273 /* Save computed information. */ 274 current_frame_info.pretend_size = pretend_size; 275 current_frame_info.var_size = var_size; 276 current_frame_info.args_size = args_size; 277 current_frame_info.reg_size = reg_size; 278 current_frame_info.frame_size = args_size + var_size; 279 current_frame_info.total_size = args_size + var_size + reg_size + pretend_size; 280 current_frame_info.gmask = gmask; 281 current_frame_info.initialised = reload_completed; 282 283 /* Calculate the required distance. */ 284 return_value = 0; 285 286 if (to_reg == STACK_POINTER_REGNUM) 287 return_value += args_size + var_size; 288 289 if (from_reg == ARG_POINTER_REGNUM) 290 return_value += reg_size; 291 292 return return_value; 293 } 294 295 /* Called after register allocation to add any instructions needed for the 296 prologue. Using a prologue insn is favored compared to putting all of the 297 instructions in output_function_prologue(), since it allows the scheduler 298 to intermix instructions with the saves of the caller saved registers. In 299 some cases, it might be necessary to emit a barrier instruction as the last 300 insn to prevent such scheduling. */ 301 302 void 303 fr30_expand_prologue (void) 304 { 305 int regno; 306 rtx insn; 307 308 if (! current_frame_info.initialised) 309 fr30_compute_frame_size (0, 0); 310 311 /* This cases shouldn't happen. Catch it now. */ 312 gcc_assert (current_frame_info.total_size || !current_frame_info.gmask); 313 314 /* Allocate space for register arguments if this is a variadic function. */ 315 if (current_frame_info.pretend_size) 316 { 317 int regs_to_save = current_frame_info.pretend_size / UNITS_PER_WORD; 318 319 /* Push argument registers into the pretend arg area. */ 320 for (regno = FIRST_ARG_REGNUM + FR30_NUM_ARG_REGS; regno --, regs_to_save --;) 321 { 322 insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno))); 323 RTX_FRAME_RELATED_P (insn) = 1; 324 } 325 } 326 327 if (current_frame_info.gmask) 328 { 329 /* Save any needed call-saved regs. */ 330 for (regno = STACK_POINTER_REGNUM; regno--;) 331 { 332 if ((current_frame_info.gmask & (1 << regno)) != 0) 333 { 334 insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno))); 335 RTX_FRAME_RELATED_P (insn) = 1; 336 } 337 } 338 } 339 340 /* Save return address if necessary. */ 341 if (current_frame_info.save_rp) 342 { 343 insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, 344 RETURN_POINTER_REGNUM))); 345 RTX_FRAME_RELATED_P (insn) = 1; 346 } 347 348 /* Save old frame pointer and create new one, if necessary. */ 349 if (current_frame_info.save_fp) 350 { 351 if (current_frame_info.frame_size < ((1 << 10) - UNITS_PER_WORD)) 352 { 353 int enter_size = current_frame_info.frame_size + UNITS_PER_WORD; 354 rtx pattern; 355 356 insn = emit_insn (gen_enter_func (GEN_INT (enter_size))); 357 RTX_FRAME_RELATED_P (insn) = 1; 358 359 pattern = PATTERN (insn); 360 361 /* Also mark all 3 subexpressions as RTX_FRAME_RELATED_P. */ 362 if (GET_CODE (pattern) == PARALLEL) 363 { 364 int x; 365 for (x = XVECLEN (pattern, 0); x--;) 366 { 367 rtx part = XVECEXP (pattern, 0, x); 368 369 /* One of the insns in the ENTER pattern updates the 370 frame pointer. If we do not actually need the frame 371 pointer in this function then this is a side effect 372 rather than a desired effect, so we do not mark that 373 insn as being related to the frame set up. Doing this 374 allows us to compile the crash66.C test file in the 375 G++ testsuite. */ 376 if (! frame_pointer_needed 377 && GET_CODE (part) == SET 378 && SET_DEST (part) == hard_frame_pointer_rtx) 379 RTX_FRAME_RELATED_P (part) = 0; 380 else 381 RTX_FRAME_RELATED_P (part) = 1; 382 } 383 } 384 } 385 else 386 { 387 insn = emit_insn (gen_movsi_push (frame_pointer_rtx)); 388 RTX_FRAME_RELATED_P (insn) = 1; 389 390 if (frame_pointer_needed) 391 { 392 insn = emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx)); 393 RTX_FRAME_RELATED_P (insn) = 1; 394 } 395 } 396 } 397 398 /* Allocate the stack frame. */ 399 if (current_frame_info.frame_size == 0) 400 ; /* Nothing to do. */ 401 else if (current_frame_info.save_fp 402 && current_frame_info.frame_size < ((1 << 10) - UNITS_PER_WORD)) 403 ; /* Nothing to do. */ 404 else if (current_frame_info.frame_size <= 512) 405 { 406 insn = emit_insn (gen_add_to_stack 407 (GEN_INT (- (signed) current_frame_info.frame_size))); 408 RTX_FRAME_RELATED_P (insn) = 1; 409 } 410 else 411 { 412 rtx tmp = gen_rtx_REG (Pmode, PROLOGUE_TMP_REGNUM); 413 insn = emit_insn (gen_movsi (tmp, GEN_INT (current_frame_info.frame_size))); 414 RTX_FRAME_RELATED_P (insn) = 1; 415 insn = emit_insn (gen_subsi3 (stack_pointer_rtx, stack_pointer_rtx, tmp)); 416 RTX_FRAME_RELATED_P (insn) = 1; 417 } 418 419 if (crtl->profile) 420 emit_insn (gen_blockage ()); 421 } 422 423 /* Called after register allocation to add any instructions needed for the 424 epilogue. Using an epilogue insn is favored compared to putting all of the 425 instructions in output_function_epilogue(), since it allows the scheduler 426 to intermix instructions with the restores of the caller saved registers. 427 In some cases, it might be necessary to emit a barrier instruction as the 428 first insn to prevent such scheduling. */ 429 void 430 fr30_expand_epilogue (void) 431 { 432 int regno; 433 434 /* Perform the inversion operations of the prologue. */ 435 gcc_assert (current_frame_info.initialised); 436 437 /* Pop local variables and arguments off the stack. 438 If frame_pointer_needed is TRUE then the frame pointer register 439 has actually been used as a frame pointer, and we can recover 440 the stack pointer from it, otherwise we must unwind the stack 441 manually. */ 442 if (current_frame_info.frame_size > 0) 443 { 444 if (current_frame_info.save_fp && frame_pointer_needed) 445 { 446 emit_insn (gen_leave_func ()); 447 current_frame_info.save_fp = 0; 448 } 449 else if (current_frame_info.frame_size <= 508) 450 emit_insn (gen_add_to_stack 451 (GEN_INT (current_frame_info.frame_size))); 452 else 453 { 454 rtx tmp = gen_rtx_REG (Pmode, PROLOGUE_TMP_REGNUM); 455 emit_insn (gen_movsi (tmp, GEN_INT (current_frame_info.frame_size))); 456 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, tmp)); 457 } 458 } 459 460 if (current_frame_info.save_fp) 461 emit_insn (gen_movsi_pop (frame_pointer_rtx)); 462 463 /* Pop all the registers that were pushed. */ 464 if (current_frame_info.save_rp) 465 emit_insn (gen_movsi_pop (gen_rtx_REG (Pmode, RETURN_POINTER_REGNUM))); 466 467 for (regno = 0; regno < STACK_POINTER_REGNUM; regno ++) 468 if (current_frame_info.gmask & (1 << regno)) 469 emit_insn (gen_movsi_pop (gen_rtx_REG (Pmode, regno))); 470 471 if (current_frame_info.pretend_size) 472 emit_insn (gen_add_to_stack (GEN_INT (current_frame_info.pretend_size))); 473 474 /* Reset state info for each function. */ 475 current_frame_info = zero_frame_info; 476 477 emit_jump_insn (gen_return_from_func ()); 478 } 479 480 /* Do any needed setup for a variadic function. We must create a register 481 parameter block, and then copy any anonymous arguments, plus the last 482 named argument, from registers into memory. * copying actually done in 483 fr30_expand_prologue(). 484 485 ARG_REGS_USED_SO_FAR has *not* been updated for the last named argument 486 which has type TYPE and mode MODE, and we rely on this fact. */ 487 void 488 fr30_setup_incoming_varargs (cumulative_args_t arg_regs_used_so_far_v, 489 machine_mode mode, 490 tree type ATTRIBUTE_UNUSED, 491 int *pretend_size, 492 int second_time ATTRIBUTE_UNUSED) 493 { 494 CUMULATIVE_ARGS *arg_regs_used_so_far 495 = get_cumulative_args (arg_regs_used_so_far_v); 496 int size; 497 498 /* All BLKmode values are passed by reference. */ 499 gcc_assert (mode != BLKmode); 500 501 /* ??? This run-time test as well as the code inside the if 502 statement is probably unnecessary. */ 503 if (targetm.calls.strict_argument_naming (arg_regs_used_so_far_v)) 504 /* If TARGET_STRICT_ARGUMENT_NAMING returns true, then the last named 505 arg must not be treated as an anonymous arg. */ 506 /* ??? This is a pointer increment, which makes no sense. */ 507 arg_regs_used_so_far += fr30_num_arg_regs (mode, type); 508 509 size = FR30_NUM_ARG_REGS - (* arg_regs_used_so_far); 510 511 if (size <= 0) 512 return; 513 514 * pretend_size = (size * UNITS_PER_WORD); 515 } 516 517 /*}}}*/ 518 /*{{{ Printing operands */ 519 520 /* Print a memory address as an operand to reference that memory location. */ 521 522 void 523 fr30_print_operand_address (FILE *stream, rtx address) 524 { 525 switch (GET_CODE (address)) 526 { 527 case SYMBOL_REF: 528 output_addr_const (stream, address); 529 break; 530 531 default: 532 fprintf (stderr, "code = %x\n", GET_CODE (address)); 533 debug_rtx (address); 534 output_operand_lossage ("fr30_print_operand_address: unhandled address"); 535 break; 536 } 537 } 538 539 /* Print an operand. */ 540 541 void 542 fr30_print_operand (FILE *file, rtx x, int code) 543 { 544 rtx x0; 545 546 switch (code) 547 { 548 case '#': 549 /* Output a :D if this instruction is delayed. */ 550 if (dbr_sequence_length () != 0) 551 fputs (":D", file); 552 return; 553 554 case 'p': 555 /* Compute the register name of the second register in a hi/lo 556 register pair. */ 557 if (GET_CODE (x) != REG) 558 output_operand_lossage ("fr30_print_operand: unrecognized %%p code"); 559 else 560 fprintf (file, "r%d", REGNO (x) + 1); 561 return; 562 563 case 'b': 564 /* Convert GCC's comparison operators into FR30 comparison codes. */ 565 switch (GET_CODE (x)) 566 { 567 case EQ: fprintf (file, "eq"); break; 568 case NE: fprintf (file, "ne"); break; 569 case LT: fprintf (file, "lt"); break; 570 case LE: fprintf (file, "le"); break; 571 case GT: fprintf (file, "gt"); break; 572 case GE: fprintf (file, "ge"); break; 573 case LTU: fprintf (file, "c"); break; 574 case LEU: fprintf (file, "ls"); break; 575 case GTU: fprintf (file, "hi"); break; 576 case GEU: fprintf (file, "nc"); break; 577 default: 578 output_operand_lossage ("fr30_print_operand: unrecognized %%b code"); 579 break; 580 } 581 return; 582 583 case 'B': 584 /* Convert GCC's comparison operators into the complimentary FR30 585 comparison codes. */ 586 switch (GET_CODE (x)) 587 { 588 case EQ: fprintf (file, "ne"); break; 589 case NE: fprintf (file, "eq"); break; 590 case LT: fprintf (file, "ge"); break; 591 case LE: fprintf (file, "gt"); break; 592 case GT: fprintf (file, "le"); break; 593 case GE: fprintf (file, "lt"); break; 594 case LTU: fprintf (file, "nc"); break; 595 case LEU: fprintf (file, "hi"); break; 596 case GTU: fprintf (file, "ls"); break; 597 case GEU: fprintf (file, "c"); break; 598 default: 599 output_operand_lossage ("fr30_print_operand: unrecognized %%B code"); 600 break; 601 } 602 return; 603 604 case 'A': 605 /* Print a signed byte value as an unsigned value. */ 606 if (GET_CODE (x) != CONST_INT) 607 output_operand_lossage ("fr30_print_operand: invalid operand to %%A code"); 608 else 609 { 610 HOST_WIDE_INT val; 611 612 val = INTVAL (x); 613 614 val &= 0xff; 615 616 fprintf (file, HOST_WIDE_INT_PRINT_DEC, val); 617 } 618 return; 619 620 case 'x': 621 if (GET_CODE (x) != CONST_INT 622 || INTVAL (x) < 16 623 || INTVAL (x) > 32) 624 output_operand_lossage ("fr30_print_operand: invalid %%x code"); 625 else 626 fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x) - 16); 627 return; 628 629 case 'F': 630 if (GET_CODE (x) != CONST_DOUBLE) 631 output_operand_lossage ("fr30_print_operand: invalid %%F code"); 632 else 633 { 634 char str[30]; 635 636 real_to_decimal (str, CONST_DOUBLE_REAL_VALUE (x), 637 sizeof (str), 0, 1); 638 fputs (str, file); 639 } 640 return; 641 642 case 0: 643 /* Handled below. */ 644 break; 645 646 default: 647 fprintf (stderr, "unknown code = %x\n", code); 648 output_operand_lossage ("fr30_print_operand: unknown code"); 649 return; 650 } 651 652 switch (GET_CODE (x)) 653 { 654 case REG: 655 fputs (reg_names [REGNO (x)], file); 656 break; 657 658 case MEM: 659 x0 = XEXP (x,0); 660 661 switch (GET_CODE (x0)) 662 { 663 case REG: 664 gcc_assert ((unsigned) REGNO (x0) < ARRAY_SIZE (reg_names)); 665 fprintf (file, "@%s", reg_names [REGNO (x0)]); 666 break; 667 668 case PLUS: 669 if (GET_CODE (XEXP (x0, 0)) != REG 670 || REGNO (XEXP (x0, 0)) < FRAME_POINTER_REGNUM 671 || REGNO (XEXP (x0, 0)) > STACK_POINTER_REGNUM 672 || GET_CODE (XEXP (x0, 1)) != CONST_INT) 673 { 674 fprintf (stderr, "bad INDEXed address:"); 675 debug_rtx (x); 676 output_operand_lossage ("fr30_print_operand: unhandled MEM"); 677 } 678 else if (REGNO (XEXP (x0, 0)) == FRAME_POINTER_REGNUM) 679 { 680 HOST_WIDE_INT val = INTVAL (XEXP (x0, 1)); 681 if (val < -(1 << 9) || val > ((1 << 9) - 4)) 682 { 683 fprintf (stderr, "frame INDEX out of range:"); 684 debug_rtx (x); 685 output_operand_lossage ("fr30_print_operand: unhandled MEM"); 686 } 687 fprintf (file, "@(r14, #" HOST_WIDE_INT_PRINT_DEC ")", val); 688 } 689 else 690 { 691 HOST_WIDE_INT val = INTVAL (XEXP (x0, 1)); 692 if (val < 0 || val > ((1 << 6) - 4)) 693 { 694 fprintf (stderr, "stack INDEX out of range:"); 695 debug_rtx (x); 696 output_operand_lossage ("fr30_print_operand: unhandled MEM"); 697 } 698 fprintf (file, "@(r15, #" HOST_WIDE_INT_PRINT_DEC ")", val); 699 } 700 break; 701 702 case SYMBOL_REF: 703 output_address (x0); 704 break; 705 706 default: 707 fprintf (stderr, "bad MEM code = %x\n", GET_CODE (x0)); 708 debug_rtx (x); 709 output_operand_lossage ("fr30_print_operand: unhandled MEM"); 710 break; 711 } 712 break; 713 714 case CONST_DOUBLE : 715 /* We handle SFmode constants here as output_addr_const doesn't. */ 716 if (GET_MODE (x) == SFmode) 717 { 718 REAL_VALUE_TYPE d; 719 long l; 720 721 REAL_VALUE_FROM_CONST_DOUBLE (d, x); 722 REAL_VALUE_TO_TARGET_SINGLE (d, l); 723 fprintf (file, "0x%08lx", l); 724 break; 725 } 726 727 /* Fall through. Let output_addr_const deal with it. */ 728 default: 729 output_addr_const (file, x); 730 break; 731 } 732 733 return; 734 } 735 736 /*}}}*/ 737 738 /* Implements TARGET_FUNCTION_VALUE. */ 739 740 static rtx 741 fr30_function_value (const_tree valtype, 742 const_tree fntype_or_decli ATTRIBUTE_UNUSED, 743 bool outgoing ATTRIBUTE_UNUSED) 744 { 745 return gen_rtx_REG (TYPE_MODE (valtype), RETURN_VALUE_REGNUM); 746 } 747 748 /* Implements TARGET_LIBCALL_VALUE. */ 749 750 static rtx 751 fr30_libcall_value (machine_mode mode, 752 const_rtx fun ATTRIBUTE_UNUSED) 753 { 754 return gen_rtx_REG (mode, RETURN_VALUE_REGNUM); 755 } 756 757 /* Implements TARGET_FUNCTION_VALUE_REGNO_P. */ 758 759 static bool 760 fr30_function_value_regno_p (const unsigned int regno) 761 { 762 return (regno == RETURN_VALUE_REGNUM); 763 } 764 765 /*{{{ Function arguments */ 766 767 /* Return true if we should pass an argument on the stack rather than 768 in registers. */ 769 770 static bool 771 fr30_must_pass_in_stack (machine_mode mode, const_tree type) 772 { 773 if (mode == BLKmode) 774 return true; 775 if (type == NULL) 776 return false; 777 return AGGREGATE_TYPE_P (type); 778 } 779 780 /* Compute the number of word sized registers needed to hold a 781 function argument of mode INT_MODE and tree type TYPE. */ 782 static int 783 fr30_num_arg_regs (machine_mode mode, const_tree type) 784 { 785 int size; 786 787 if (targetm.calls.must_pass_in_stack (mode, type)) 788 return 0; 789 790 if (type && mode == BLKmode) 791 size = int_size_in_bytes (type); 792 else 793 size = GET_MODE_SIZE (mode); 794 795 return (size + UNITS_PER_WORD - 1) / UNITS_PER_WORD; 796 } 797 798 /* Returns the number of bytes in which *part* of a parameter of machine 799 mode MODE and tree type TYPE (which may be NULL if the type is not known). 800 If the argument fits entirely in the argument registers, or entirely on 801 the stack, then 0 is returned. 802 CUM is the number of argument registers already used by earlier 803 parameters to the function. */ 804 805 static int 806 fr30_arg_partial_bytes (cumulative_args_t cum_v, machine_mode mode, 807 tree type, bool named) 808 { 809 CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); 810 811 /* Unnamed arguments, i.e. those that are prototyped as ... 812 are always passed on the stack. 813 Also check here to see if all the argument registers are full. */ 814 if (named == 0 || *cum >= FR30_NUM_ARG_REGS) 815 return 0; 816 817 /* Work out how many argument registers would be needed if this 818 parameter were to be passed entirely in registers. If there 819 are sufficient argument registers available (or if no registers 820 are needed because the parameter must be passed on the stack) 821 then return zero, as this parameter does not require partial 822 register, partial stack stack space. */ 823 if (*cum + fr30_num_arg_regs (mode, type) <= FR30_NUM_ARG_REGS) 824 return 0; 825 826 return (FR30_NUM_ARG_REGS - *cum) * UNITS_PER_WORD; 827 } 828 829 static rtx 830 fr30_function_arg (cumulative_args_t cum_v, machine_mode mode, 831 const_tree type, bool named) 832 { 833 CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); 834 835 if (!named 836 || fr30_must_pass_in_stack (mode, type) 837 || *cum >= FR30_NUM_ARG_REGS) 838 return NULL_RTX; 839 else 840 return gen_rtx_REG (mode, *cum + FIRST_ARG_REGNUM); 841 } 842 843 /* A C statement (sans semicolon) to update the summarizer variable CUM to 844 advance past an argument in the argument list. The values MODE, TYPE and 845 NAMED describe that argument. Once this is done, the variable CUM is 846 suitable for analyzing the *following* argument with `FUNCTION_ARG', etc. 847 848 This macro need not do anything if the argument in question was passed on 849 the stack. The compiler knows how to track the amount of stack space used 850 for arguments without any special help. */ 851 static void 852 fr30_function_arg_advance (cumulative_args_t cum, machine_mode mode, 853 const_tree type, bool named) 854 { 855 *get_cumulative_args (cum) += named * fr30_num_arg_regs (mode, type); 856 } 857 858 /*}}}*/ 859 /*{{{ Operand predicates */ 860 861 #ifndef Mmode 862 #define Mmode machine_mode 863 #endif 864 865 /* Returns true iff all the registers in the operands array 866 are in descending or ascending order. */ 867 int 868 fr30_check_multiple_regs (rtx *operands, int num_operands, int descending) 869 { 870 if (descending) 871 { 872 unsigned int prev_regno = 0; 873 874 while (num_operands --) 875 { 876 if (GET_CODE (operands [num_operands]) != REG) 877 return 0; 878 879 if (REGNO (operands [num_operands]) < prev_regno) 880 return 0; 881 882 prev_regno = REGNO (operands [num_operands]); 883 } 884 } 885 else 886 { 887 unsigned int prev_regno = CONDITION_CODE_REGNUM; 888 889 while (num_operands --) 890 { 891 if (GET_CODE (operands [num_operands]) != REG) 892 return 0; 893 894 if (REGNO (operands [num_operands]) > prev_regno) 895 return 0; 896 897 prev_regno = REGNO (operands [num_operands]); 898 } 899 } 900 901 return 1; 902 } 903 904 int 905 fr30_const_double_is_zero (rtx operand) 906 { 907 REAL_VALUE_TYPE d; 908 909 if (operand == NULL || GET_CODE (operand) != CONST_DOUBLE) 910 return 0; 911 912 REAL_VALUE_FROM_CONST_DOUBLE (d, operand); 913 914 return REAL_VALUES_EQUAL (d, dconst0); 915 } 916 917 /*}}}*/ 918 /*{{{ Instruction Output Routines */ 919 920 /* Output a double word move. 921 It must be REG<-REG, REG<-MEM, MEM<-REG or REG<-CONST. 922 On the FR30 we are constrained by the fact that it does not 923 support offsetable addresses, and so we have to load the 924 address of the secnd word into the second destination register 925 before we can use it. */ 926 927 rtx 928 fr30_move_double (rtx * operands) 929 { 930 rtx src = operands[1]; 931 rtx dest = operands[0]; 932 enum rtx_code src_code = GET_CODE (src); 933 enum rtx_code dest_code = GET_CODE (dest); 934 machine_mode mode = GET_MODE (dest); 935 rtx val; 936 937 start_sequence (); 938 939 if (dest_code == REG) 940 { 941 if (src_code == REG) 942 { 943 int reverse = (REGNO (dest) == REGNO (src) + 1); 944 945 /* We normally copy the low-numbered register first. However, if 946 the first register of operand 0 is the same as the second register 947 of operand 1, we must copy in the opposite order. */ 948 emit_insn (gen_rtx_SET (VOIDmode, 949 operand_subword (dest, reverse, TRUE, mode), 950 operand_subword (src, reverse, TRUE, mode))); 951 952 emit_insn (gen_rtx_SET (VOIDmode, 953 operand_subword (dest, !reverse, TRUE, mode), 954 operand_subword (src, !reverse, TRUE, mode))); 955 } 956 else if (src_code == MEM) 957 { 958 rtx addr = XEXP (src, 0); 959 rtx dest0 = operand_subword (dest, 0, TRUE, mode); 960 rtx dest1 = operand_subword (dest, 1, TRUE, mode); 961 rtx new_mem; 962 963 gcc_assert (GET_CODE (addr) == REG); 964 965 /* Copy the address before clobbering it. See PR 34174. */ 966 emit_insn (gen_rtx_SET (SImode, dest1, addr)); 967 emit_insn (gen_rtx_SET (VOIDmode, dest0, 968 adjust_address (src, SImode, 0))); 969 emit_insn (gen_rtx_SET (SImode, dest1, 970 plus_constant (SImode, dest1, 971 UNITS_PER_WORD))); 972 973 new_mem = gen_rtx_MEM (SImode, dest1); 974 MEM_COPY_ATTRIBUTES (new_mem, src); 975 976 emit_insn (gen_rtx_SET (VOIDmode, dest1, new_mem)); 977 } 978 else if (src_code == CONST_INT || src_code == CONST_DOUBLE) 979 { 980 rtx words[2]; 981 split_double (src, &words[0], &words[1]); 982 emit_insn (gen_rtx_SET (VOIDmode, 983 operand_subword (dest, 0, TRUE, mode), 984 words[0])); 985 986 emit_insn (gen_rtx_SET (VOIDmode, 987 operand_subword (dest, 1, TRUE, mode), 988 words[1])); 989 } 990 } 991 else if (src_code == REG && dest_code == MEM) 992 { 993 rtx addr = XEXP (dest, 0); 994 rtx src0; 995 rtx src1; 996 997 gcc_assert (GET_CODE (addr) == REG); 998 999 src0 = operand_subword (src, 0, TRUE, mode); 1000 src1 = operand_subword (src, 1, TRUE, mode); 1001 1002 emit_move_insn (adjust_address (dest, SImode, 0), src0); 1003 1004 if (REGNO (addr) == STACK_POINTER_REGNUM 1005 || REGNO (addr) == FRAME_POINTER_REGNUM) 1006 emit_insn (gen_rtx_SET (VOIDmode, 1007 adjust_address (dest, SImode, UNITS_PER_WORD), 1008 src1)); 1009 else 1010 { 1011 rtx new_mem; 1012 rtx scratch_reg_r0 = gen_rtx_REG (SImode, 0); 1013 1014 /* We need a scratch register to hold the value of 'address + 4'. 1015 We use r0 for this purpose. It is used for example for long 1016 jumps and is already marked to not be used by normal register 1017 allocation. */ 1018 emit_insn (gen_movsi_internal (scratch_reg_r0, addr)); 1019 emit_insn (gen_addsi_small_int (scratch_reg_r0, scratch_reg_r0, 1020 GEN_INT (UNITS_PER_WORD))); 1021 new_mem = gen_rtx_MEM (SImode, scratch_reg_r0); 1022 MEM_COPY_ATTRIBUTES (new_mem, dest); 1023 emit_move_insn (new_mem, src1); 1024 emit_insn (gen_blockage ()); 1025 } 1026 } 1027 else 1028 /* This should have been prevented by the constraints on movdi_insn. */ 1029 gcc_unreachable (); 1030 1031 val = get_insns (); 1032 end_sequence (); 1033 1034 return val; 1035 } 1036 1037 /* Implement TARGET_FRAME_POINTER_REQUIRED. */ 1038 1039 bool 1040 fr30_frame_pointer_required (void) 1041 { 1042 return (flag_omit_frame_pointer == 0 || crtl->args.pretend_args_size > 0); 1043 } 1044 1045 /*}}}*/ 1046 /*{{{ Trampoline Output Routines */ 1047 1048 /* Implement TARGET_ASM_TRAMPOLINE_TEMPLATE. 1049 On the FR30, the trampoline is: 1050 1051 nop 1052 ldi:32 STATIC, r12 1053 nop 1054 ldi:32 FUNCTION, r0 1055 jmp @r0 1056 1057 The no-ops are to guarantee that the static chain and final 1058 target are 32 bit aligned within the trampoline. That allows us to 1059 initialize those locations with simple SImode stores. The alternative 1060 would be to use HImode stores. */ 1061 1062 static void 1063 fr30_asm_trampoline_template (FILE *f) 1064 { 1065 fprintf (f, "\tnop\n"); 1066 fprintf (f, "\tldi:32\t#0, %s\n", reg_names [STATIC_CHAIN_REGNUM]); 1067 fprintf (f, "\tnop\n"); 1068 fprintf (f, "\tldi:32\t#0, %s\n", reg_names [COMPILER_SCRATCH_REGISTER]); 1069 fprintf (f, "\tjmp\t@%s\n", reg_names [COMPILER_SCRATCH_REGISTER]); 1070 } 1071 1072 /* Implement TARGET_TRAMPOLINE_INIT. */ 1073 1074 static void 1075 fr30_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value) 1076 { 1077 rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); 1078 rtx mem; 1079 1080 emit_block_move (m_tramp, assemble_trampoline_template (), 1081 GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL); 1082 1083 mem = adjust_address (m_tramp, SImode, 4); 1084 emit_move_insn (mem, chain_value); 1085 mem = adjust_address (m_tramp, SImode, 12); 1086 emit_move_insn (mem, fnaddr); 1087 } 1088 1089 /*}}}*/ 1090 /* Local Variables: */ 1091 /* folded-file: t */ 1092 /* End: */ 1093