1/* Definitions of target machine for GNU compiler. VAX version. 2 Copyright (C) 1987, 1988, 1991, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GCC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to 19the Free Software Foundation, 51 Franklin Street, Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22 23/* Target CPU builtins. */ 24#define TARGET_CPU_CPP_BUILTINS() \ 25 do \ 26 { \ 27 builtin_define ("__vax__"); \ 28 builtin_assert ("cpu=vax"); \ 29 builtin_assert ("machine=vax"); \ 30 if (TARGET_G_FLOAT) \ 31 { \ 32 builtin_define ("__GFLOAT"); \ 33 builtin_define ("__GFLOAT__"); \ 34 } \ 35 } \ 36 while (0) 37 38#define VMS_TARGET 0 39 40/* Use -J option for long branch support with Unix assembler. */ 41 42#define ASM_SPEC "-J" 43 44/* Choose proper libraries depending on float format. 45 Note that there are no profiling libraries for g-format. 46 Also use -lg for the sake of dbx. */ 47 48#define LIB_SPEC "%{g:-lg}\ 49 %{mg:%{lm:-lmg} -lcg \ 50 %{p:%eprofiling not supported with -mg\n}\ 51 %{pg:%eprofiling not supported with -mg\n}}\ 52 %{!mg:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}" 53 54/* Print subsidiary information on the compiler version in use. */ 55 56#ifndef TARGET_NAME /* A more specific value might be supplied via -D. */ 57#define TARGET_NAME "vax" 58#endif 59#define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME) 60 61/* Run-time compilation parameters selecting different hardware subsets. */ 62 63/* Nonzero if ELF. Redefined by vax/elf.h. */ 64#define TARGET_ELF 0 65 66/* Default target_flags if no switches specified. */ 67 68#ifndef TARGET_DEFAULT 69#define TARGET_DEFAULT (MASK_UNIX_ASM) 70#endif 71 72#define OVERRIDE_OPTIONS override_options () 73 74 75/* Target machine storage layout */ 76 77/* Define this if most significant bit is lowest numbered 78 in instructions that operate on numbered bit-fields. 79 This is not true on the VAX. */ 80#define BITS_BIG_ENDIAN 0 81 82/* Define this if most significant byte of a word is the lowest numbered. */ 83/* That is not true on the VAX. */ 84#define BYTES_BIG_ENDIAN 0 85 86/* Define this if most significant word of a multiword number is the lowest 87 numbered. */ 88/* This is not true on the VAX. */ 89#define WORDS_BIG_ENDIAN 0 90 91/* Width of a word, in units (bytes). */ 92#define UNITS_PER_WORD 4 93 94/* Allocation boundary (in *bits*) for storing arguments in argument list. */ 95#define PARM_BOUNDARY 32 96 97/* Allocation boundary (in *bits*) for the code of a function. */ 98#define FUNCTION_BOUNDARY 16 99 100/* Alignment of field after `int : 0' in a structure. */ 101#define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32) 102 103/* Every structure's size must be a multiple of this. */ 104#define STRUCTURE_SIZE_BOUNDARY 8 105 106/* A bit-field declared as `int' forces `int' alignment for the struct. */ 107#define PCC_BITFIELD_TYPE_MATTERS (!TARGET_VAXC_ALIGNMENT) 108 109/* No data type wants to be aligned rounder than this. */ 110#define BIGGEST_ALIGNMENT 32 111 112/* No structure field wants to be aligned rounder than this. */ 113#define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32) 114 115/* Set this nonzero if move instructions will actually fail to work 116 when given unaligned data. */ 117#define STRICT_ALIGNMENT 0 118 119/* Let's keep the stack somewhat aligned. */ 120#define STACK_BOUNDARY 32 121 122/* The table of an ADDR_DIFF_VEC must be contiguous with the case 123 opcode, it is part of the case instruction. */ 124#define ADDR_VEC_ALIGN(ADDR_VEC) 0 125 126/* Standard register usage. */ 127 128/* Number of actual hardware registers. 129 The hardware registers are assigned numbers for the compiler 130 from 0 to just below FIRST_PSEUDO_REGISTER. 131 All registers that the compiler knows about must be given numbers, 132 even those that are not normally considered general registers. */ 133#define FIRST_PSEUDO_REGISTER 16 134 135/* 1 for registers that have pervasive standard uses 136 and are not available for the register allocator. 137 On the VAX, these are the AP, FP, SP and PC. */ 138#define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} 139 140/* 1 for registers not available across function calls. 141 These must include the FIXED_REGISTERS and also any 142 registers that can be used without being saved. 143 The latter must include the registers where values are returned 144 and the register where structure-value addresses are passed. 145 Aside from that, you can include as many other registers as you like. */ 146#define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} 147 148/* Return number of consecutive hard regs needed starting at reg REGNO 149 to hold something of mode MODE. 150 This is ordinarily the length in words of a value of mode MODE 151 but can be less for certain modes in special long registers. 152 On the VAX, all registers are one word long. */ 153#define HARD_REGNO_NREGS(REGNO, MODE) \ 154 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 155 156/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. 157 On the VAX, all registers can hold all modes. */ 158#define HARD_REGNO_MODE_OK(REGNO, MODE) 1 159 160/* Value is 1 if it is a good idea to tie two pseudo registers 161 when one has mode MODE1 and one has mode MODE2. 162 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2, 163 for any hard reg, then this must be 0 for correct output. */ 164#define MODES_TIEABLE_P(MODE1, MODE2) 1 165 166/* Specify the registers used for certain standard purposes. 167 The values of these macros are register numbers. */ 168 169/* VAX pc is overloaded on a register. */ 170#define PC_REGNUM VAX_PC_REGNUM 171 172/* Register to use for pushing function arguments. */ 173#define STACK_POINTER_REGNUM VAX_SP_REGNUM 174 175/* Base register for access to local variables of the function. */ 176#define FRAME_POINTER_REGNUM VAX_FP_REGNUM 177 178/* Value should be nonzero if functions must have frame pointers. 179 Zero means the frame pointer need not be set up (and parms 180 may be accessed via the stack pointer) in functions that seem suitable. 181 This is computed in `reload', in reload1.c. */ 182#define FRAME_POINTER_REQUIRED 1 183 184/* Base register for access to arguments of the function. */ 185#define ARG_POINTER_REGNUM VAX_AP_REGNUM 186 187/* Register in which static-chain is passed to a function. */ 188#define STATIC_CHAIN_REGNUM 0 189 190/* Register in which address to store a structure value 191 is passed to a function. */ 192#define VAX_STRUCT_VALUE_REGNUM 1 193 194/* Define the classes of registers for register constraints in the 195 machine description. Also define ranges of constants. 196 197 One of the classes must always be named ALL_REGS and include all hard regs. 198 If there is more than one class, another class must be named NO_REGS 199 and contain no registers. 200 201 The name GENERAL_REGS must be the name of a class (or an alias for 202 another name such as ALL_REGS). This is the class of registers 203 that is allowed by "g" or "r" in a register constraint. 204 Also, registers outside this class are allocated only when 205 instructions express preferences for them. 206 207 The classes must be numbered in nondecreasing order; that is, 208 a larger-numbered class must never be contained completely 209 in a smaller-numbered class. 210 211 For any two classes, it is very desirable that there be another 212 class that represents their union. */ 213 214/* The VAX has only one kind of registers, so NO_REGS and ALL_REGS 215 are the only classes. */ 216 217enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES }; 218 219#define N_REG_CLASSES (int) LIM_REG_CLASSES 220 221/* Since GENERAL_REGS is the same class as ALL_REGS, 222 don't give it a different class number; just make it an alias. */ 223 224#define GENERAL_REGS ALL_REGS 225 226/* Give names of register classes as strings for dump file. */ 227 228#define REG_CLASS_NAMES \ 229 { "NO_REGS", "ALL_REGS" } 230 231/* Define which registers fit in which classes. 232 This is an initializer for a vector of HARD_REG_SET 233 of length N_REG_CLASSES. */ 234 235#define REG_CLASS_CONTENTS {{0}, {0xffff}} 236 237/* The same information, inverted: 238 Return the class number of the smallest class containing 239 reg number REGNO. This could be a conditional expression 240 or could index an array. */ 241 242#define REGNO_REG_CLASS(REGNO) ALL_REGS 243 244/* The class value for index registers, and the one for base regs. */ 245 246#define INDEX_REG_CLASS ALL_REGS 247#define BASE_REG_CLASS ALL_REGS 248 249/* Get reg_class from a letter such as appears in the machine description. */ 250 251#define REG_CLASS_FROM_LETTER(C) NO_REGS 252 253/* The letters I, J, K, L, M, N, and O in a register constraint string 254 can be used to stand for particular ranges of immediate operands. 255 This macro defines what the ranges are. 256 C is the letter, and VALUE is a constant value. 257 Return 1 if VALUE is in the range specified by C. 258 259 `I' is the constant zero. 260 `J' is a value between 0 .. 63 (inclusive) 261 `K' is a value between -128 and 127 (inclusive) 262 'L' is a value between -32768 and 32767 (inclusive) 263 `M' is a value between 0 and 255 (inclusive) 264 'N' is a value between 0 and 65535 (inclusive) 265 `O' is a value between -63 and -1 (inclusive) */ 266 267#define CONST_OK_FOR_LETTER_P(VALUE, C) \ 268 ( (C) == 'I' ? (VALUE) == 0 \ 269 : (C) == 'J' ? 0 <= (VALUE) && (VALUE) < 64 \ 270 : (C) == 'O' ? -63 <= (VALUE) && (VALUE) < 0 \ 271 : (C) == 'K' ? -128 <= (VALUE) && (VALUE) < 128 \ 272 : (C) == 'M' ? 0 <= (VALUE) && (VALUE) < 256 \ 273 : (C) == 'L' ? -32768 <= (VALUE) && (VALUE) < 32768 \ 274 : (C) == 'N' ? 0 <= (VALUE) && (VALUE) < 65536 \ 275 : 0) 276 277/* Similar, but for floating constants, and defining letters G and H. 278 Here VALUE is the CONST_DOUBLE rtx itself. 279 280 `G' is a floating-point zero. */ 281 282#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \ 283 ((C) == 'G' ? ((VALUE) == CONST0_RTX (DFmode) \ 284 || (VALUE) == CONST0_RTX (SFmode)) \ 285 : 0) 286 287/* Optional extra constraints for this machine. 288 289 For the VAX, `Q' means that OP is a MEM that does not have a mode-dependent 290 address. */ 291 292#define EXTRA_CONSTRAINT(OP, C) \ 293 ((C) == 'Q' \ 294 ? MEM_P (OP) && !mode_dependent_address_p (XEXP (OP, 0)) \ 295 : 0) 296 297/* Given an rtx X being reloaded into a reg required to be 298 in class CLASS, return the class of reg to actually use. 299 In general this is just CLASS; but on some machines 300 in some cases it is preferable to use a more restrictive class. */ 301 302#define PREFERRED_RELOAD_CLASS(X,CLASS) (CLASS) 303 304/* Return the maximum number of consecutive registers 305 needed to represent mode MODE in a register of class CLASS. */ 306/* On the VAX, this is always the size of MODE in words, 307 since all registers are the same size. */ 308#define CLASS_MAX_NREGS(CLASS, MODE) \ 309 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 310 311/* Stack layout; function entry, exit and calling. */ 312 313/* Define this if pushing a word on the stack 314 makes the stack pointer a smaller address. */ 315#define STACK_GROWS_DOWNWARD 316 317/* Define this to nonzero if the nominal address of the stack frame 318 is at the high-address end of the local variables; 319 that is, each additional local variable allocated 320 goes at a more negative offset in the frame. */ 321#define FRAME_GROWS_DOWNWARD 1 322 323/* Offset within stack frame to start allocating local variables at. 324 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the 325 first local allocated. Otherwise, it is the offset to the BEGINNING 326 of the first local allocated. */ 327#define STARTING_FRAME_OFFSET 0 328 329/* Given an rtx for the address of a frame, 330 return an rtx for the address of the word in the frame 331 that holds the dynamic chain--the previous frame's address. */ 332#define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant ((FRAME), 12) 333 334/* If we generate an insn to push BYTES bytes, 335 this says how many the stack pointer really advances by. 336 On the VAX, -(sp) pushes only the bytes of the operands. */ 337#define PUSH_ROUNDING(BYTES) (BYTES) 338 339/* Offset of first parameter from the argument pointer register value. */ 340#define FIRST_PARM_OFFSET(FNDECL) 4 341 342/* Value is the number of bytes of arguments automatically 343 popped when returning from a subroutine call. 344 FUNDECL is the declaration node of the function (as a tree), 345 FUNTYPE is the data type of the function (as a tree), 346 or for a library call it is an identifier node for the subroutine name. 347 SIZE is the number of bytes of arguments passed on the stack. 348 349 On the VAX, the RET insn pops a maximum of 255 args for any function. */ 350 351#define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) \ 352 ((SIZE) > 255 * 4 ? 0 : (SIZE)) 353 354/* Define how to find the value returned by a function. 355 VALTYPE is the data type of the value (as a tree). 356 If the precise function being called is known, FUNC is its FUNCTION_DECL; 357 otherwise, FUNC is 0. */ 358 359/* On the VAX the return value is in R0 regardless. */ 360 361#define FUNCTION_VALUE(VALTYPE, FUNC) \ 362 gen_rtx_REG (TYPE_MODE (VALTYPE), 0) 363 364/* Define how to find the value returned by a library function 365 assuming the value has mode MODE. */ 366 367/* On the VAX the return value is in R0 regardless. */ 368 369#define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, 0) 370 371/* Define this if PCC uses the nonreentrant convention for returning 372 structure and union values. */ 373 374#define PCC_STATIC_STRUCT_RETURN 375 376/* 1 if N is a possible register number for a function value. 377 On the VAX, R0 is the only register thus used. */ 378 379#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0) 380 381/* 1 if N is a possible register number for function argument passing. 382 On the VAX, no registers are used in this way. */ 383 384#define FUNCTION_ARG_REGNO_P(N) 0 385 386/* Define a data type for recording info about an argument list 387 during the scan of that argument list. This data type should 388 hold all necessary information about the function itself 389 and about the args processed so far, enough to enable macros 390 such as FUNCTION_ARG to determine where the next arg should go. 391 392 On the VAX, this is a single integer, which is a number of bytes 393 of arguments scanned so far. */ 394 395#define CUMULATIVE_ARGS int 396 397/* Initialize a variable CUM of type CUMULATIVE_ARGS 398 for a call to a function whose data type is FNTYPE. 399 For a library call, FNTYPE is 0. 400 401 On the VAX, the offset starts at 0. */ 402 403#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ 404 ((CUM) = 0) 405 406/* Update the data in CUM to advance over an argument 407 of mode MODE and data type TYPE. 408 (TYPE is null for libcalls where that information may not be available.) */ 409 410#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \ 411 ((CUM) += ((MODE) != BLKmode \ 412 ? (GET_MODE_SIZE (MODE) + 3) & ~3 \ 413 : (int_size_in_bytes (TYPE) + 3) & ~3)) 414 415/* Define where to put the arguments to a function. 416 Value is zero to push the argument on the stack, 417 or a hard register in which to store the argument. 418 419 MODE is the argument's machine mode. 420 TYPE is the data type of the argument (as a tree). 421 This is null for libcalls where that information may 422 not be available. 423 CUM is a variable of type CUMULATIVE_ARGS which gives info about 424 the preceding args and about the function being called. 425 NAMED is nonzero if this argument is a named parameter 426 (otherwise it is an extra parameter matching an ellipsis). */ 427 428/* On the VAX all args are pushed. */ 429 430#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0 431 432/* Output assembler code to FILE to increment profiler label # LABELNO 433 for profiling a function entry. */ 434 435#define VAX_FUNCTION_PROFILER_NAME "mcount" 436#define FUNCTION_PROFILER(FILE, LABELNO) \ 437 do \ 438 { \ 439 char label[256]; \ 440 ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO)); \ 441 fprintf (FILE, "\tmovab "); \ 442 assemble_name (FILE, label); \ 443 asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n", \ 444 VAX_FUNCTION_PROFILER_NAME); \ 445 } \ 446 while (0) 447 448/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function, 449 the stack pointer does not matter. The value is tested only in 450 functions that have frame pointers. 451 No definition is equivalent to always zero. */ 452 453#define EXIT_IGNORE_STACK 1 454 455/* Store in the variable DEPTH the initial difference between the 456 frame pointer reg contents and the stack pointer reg contents, 457 as of the start of the function body. This depends on the layout 458 of the fixed parts of the stack frame and on how registers are saved. 459 460 On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this 461 macro doesn't matter. But it must be defined. */ 462 463#define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0; 464 465/* Output assembler code for a block containing the constant parts 466 of a trampoline, leaving space for the variable parts. */ 467 468/* On the VAX, the trampoline contains an entry mask and two instructions: 469 .word NN 470 movl $STATIC,r0 (store the functions static chain) 471 jmp *$FUNCTION (jump to function code at address FUNCTION) */ 472 473#define TRAMPOLINE_TEMPLATE(FILE) \ 474{ \ 475 assemble_aligned_integer (2, const0_rtx); \ 476 assemble_aligned_integer (2, GEN_INT (0x8fd0)); \ 477 assemble_aligned_integer (4, const0_rtx); \ 478 assemble_aligned_integer (1, GEN_INT (0x50 + STATIC_CHAIN_REGNUM)); \ 479 assemble_aligned_integer (2, GEN_INT (0x9f17)); \ 480 assemble_aligned_integer (4, const0_rtx); \ 481} 482 483/* Length in units of the trampoline for entering a nested function. */ 484 485#define TRAMPOLINE_SIZE 15 486 487/* Emit RTL insns to initialize the variable parts of a trampoline. 488 FNADDR is an RTX for the address of the function's pure code. 489 CXT is an RTX for the static chain value for the function. */ 490 491/* We copy the register-mask from the function's pure code 492 to the start of the trampoline. */ 493#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \ 494{ \ 495 emit_move_insn (gen_rtx_MEM (HImode, TRAMP), \ 496 gen_rtx_MEM (HImode, FNADDR)); \ 497 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 4)), CXT); \ 498 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 11)), \ 499 plus_constant (FNADDR, 2)); \ 500 emit_insn (gen_sync_istream ()); \ 501} 502 503/* Byte offset of return address in a stack frame. The "saved PC" field 504 is in element [4] when treating the frame as an array of longwords. */ 505 506#define RETURN_ADDRESS_OFFSET (4 * UNITS_PER_WORD) /* 16 */ 507 508/* A C expression whose value is RTL representing the value of the return 509 address for the frame COUNT steps up from the current frame. 510 FRAMEADDR is already the frame pointer of the COUNT frame, so we 511 can ignore COUNT. */ 512 513#define RETURN_ADDR_RTX(COUNT, FRAME) \ 514 ((COUNT == 0) \ 515 ? gen_rtx_MEM (Pmode, plus_constant (FRAME, RETURN_ADDRESS_OFFSET)) \ 516 : (rtx) 0) 517 518 519/* Addressing modes, and classification of registers for them. */ 520 521#define HAVE_POST_INCREMENT 1 522 523#define HAVE_PRE_DECREMENT 1 524 525/* Macros to check register numbers against specific register classes. */ 526 527/* These assume that REGNO is a hard or pseudo reg number. 528 They give nonzero only if REGNO is a hard reg of the suitable class 529 or a pseudo reg currently allocated to a suitable hard reg. 530 Since they use reg_renumber, they are safe only once reg_renumber 531 has been allocated, which happens in local-alloc.c. */ 532 533#define REGNO_OK_FOR_INDEX_P(regno) \ 534 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) 535#define REGNO_OK_FOR_BASE_P(regno) \ 536 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) 537 538/* Maximum number of registers that can appear in a valid memory address. */ 539 540#define MAX_REGS_PER_ADDRESS 2 541 542/* 1 if X is an rtx for a constant that is a valid address. */ 543 544#define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X) 545 546/* Nonzero if the constant value X is a legitimate general operand. 547 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */ 548 549#define LEGITIMATE_CONSTANT_P(X) legitimate_constant_p (X) 550 551/* The macros REG_OK_FOR..._P assume that the arg is a REG rtx 552 and check its validity for a certain class. 553 We have two alternate definitions for each of them. 554 The usual definition accepts all pseudo regs; the other rejects 555 them unless they have been allocated suitable hard regs. 556 The symbol REG_OK_STRICT causes the latter definition to be used. 557 558 Most source files want to accept pseudo regs in the hope that 559 they will get allocated to the class that the insn wants them to be in. 560 Source files for reload pass need to be strict. 561 After reload, it makes no difference, since pseudo regs have 562 been eliminated by then. */ 563 564#ifndef REG_OK_STRICT 565 566/* Nonzero if X is a hard reg that can be used as an index 567 or if it is a pseudo reg. */ 568#define REG_OK_FOR_INDEX_P(X) 1 569 570/* Nonzero if X is a hard reg that can be used as a base reg 571 or if it is a pseudo reg. */ 572#define REG_OK_FOR_BASE_P(X) 1 573 574/* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression 575 that is a valid memory address for an instruction. */ 576#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \ 577 { if (legitimate_address_p ((MODE), (X), 0)) goto ADDR; } 578 579#else 580 581/* Nonzero if X is a hard reg that can be used as an index. */ 582#define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X)) 583 584/* Nonzero if X is a hard reg that can be used as a base reg. */ 585#define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X)) 586 587/* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression 588 that is a valid memory address for an instruction. */ 589#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \ 590 { if (legitimate_address_p ((MODE), (X), 1)) goto ADDR; } 591 592#endif 593 594/* Go to LABEL if ADDR (a legitimate address expression) 595 has an effect that depends on the machine mode it is used for. */ 596#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \ 597 { if (vax_mode_dependent_address_p (ADDR)) goto LABEL; } 598 599/* Specify the machine mode that this machine uses 600 for the index in the tablejump instruction. */ 601#define CASE_VECTOR_MODE HImode 602 603/* Define as C expression which evaluates to nonzero if the tablejump 604 instruction expects the table to contain offsets from the address of the 605 table. 606 Do not define this if the table should contain absolute addresses. */ 607#define CASE_VECTOR_PC_RELATIVE 1 608 609/* Indicate that jump tables go in the text section. This is 610 necessary when compiling PIC code. */ 611#define JUMP_TABLES_IN_TEXT_SECTION 1 612 613/* Define this as 1 if `char' should by default be signed; else as 0. */ 614#define DEFAULT_SIGNED_CHAR 1 615 616/* This flag, if defined, says the same insns that convert to a signed fixnum 617 also convert validly to an unsigned one. */ 618#define FIXUNS_TRUNC_LIKE_FIX_TRUNC 619 620/* Max number of bytes we can move from memory to memory 621 in one reasonably fast instruction. */ 622#define MOVE_MAX 8 623 624/* Nonzero if access to memory by bytes is slow and undesirable. */ 625#define SLOW_BYTE_ACCESS 0 626 627/* Define if shifts truncate the shift count 628 which implies one can omit a sign-extension or zero-extension 629 of a shift count. */ 630/* #define SHIFT_COUNT_TRUNCATED */ 631 632/* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits 633 is done just by pretending it is already truncated. */ 634#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 635 636/* Specify the machine mode that pointers have. 637 After generation of rtl, the compiler makes no further distinction 638 between pointers and any other objects of this machine mode. */ 639#define Pmode SImode 640 641/* A function address in a call instruction 642 is a byte address (for indexing purposes) 643 so give the MEM rtx a byte's mode. */ 644#define FUNCTION_MODE QImode 645 646/* This machine doesn't use IEEE floats. */ 647 648#define TARGET_FLOAT_FORMAT VAX_FLOAT_FORMAT 649 650/* Specify the cost of a branch insn; roughly the number of extra insns that 651 should be added to avoid a branch. 652 653 Branches are extremely cheap on the VAX while the shift insns often 654 used to replace branches can be expensive. */ 655 656#define BRANCH_COST 0 657 658/* Tell final.c how to eliminate redundant test instructions. */ 659 660/* Here we define machine-dependent flags and fields in cc_status 661 (see `conditions.h'). No extra ones are needed for the VAX. */ 662 663/* Store in cc_status the expressions 664 that the condition codes will describe 665 after execution of an instruction whose pattern is EXP. 666 Do not alter them if the instruction would not alter the cc's. */ 667 668#define NOTICE_UPDATE_CC(EXP, INSN) \ 669 vax_notice_update_cc ((EXP), (INSN)) 670 671#define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \ 672 { if (cc_status.flags & CC_NO_OVERFLOW) \ 673 return NO_OV; \ 674 return NORMAL; \ 675 } 676 677/* Control the assembler format that we output. */ 678 679/* A C string constant describing how to begin a comment in the target 680 assembler language. The compiler assumes that the comment will end at 681 the end of the line. */ 682 683#define ASM_COMMENT_START "#" 684 685/* Output to assembler file text saying following lines 686 may contain character constants, extra white space, comments, etc. */ 687 688#define ASM_APP_ON "#APP\n" 689 690/* Output to assembler file text saying following lines 691 no longer contain unusual constructs. */ 692 693#define ASM_APP_OFF "#NO_APP\n" 694 695/* Output before read-only data. */ 696 697#define TEXT_SECTION_ASM_OP "\t.text" 698 699/* Output before writable data. */ 700 701#define DATA_SECTION_ASM_OP "\t.data" 702 703/* How to refer to registers in assembler output. 704 This sequence is indexed by compiler's hard-register-number (see above). 705 The register names will be prefixed by REGISTER_PREFIX, if any. */ 706 707#define REGISTER_PREFIX "" 708#define REGISTER_NAMES \ 709 { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ 710 "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", } 711 712/* This is BSD, so it wants DBX format. */ 713 714#define DBX_DEBUGGING_INFO 1 715 716/* Do not break .stabs pseudos into continuations. */ 717 718#define DBX_CONTIN_LENGTH 0 719 720/* This is the char to use for continuation (in case we need to turn 721 continuation back on). */ 722 723#define DBX_CONTIN_CHAR '?' 724 725/* Don't use the `xsfoo;' construct in DBX output; this system 726 doesn't support it. */ 727 728#define DBX_NO_XREFS 729 730/* Output the .stabs for a C `static' variable in the data section. */ 731#define DBX_STATIC_STAB_DATA_SECTION 732 733/* VAX specific: which type character is used for type double? */ 734 735#define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd') 736 737/* This is how to output a command to make the user-level label named NAME 738 defined for reference from other files. */ 739 740/* Globalizing directive for a label. */ 741#define GLOBAL_ASM_OP ".globl " 742 743/* The prefix to add to user-visible assembler symbols. */ 744 745#define USER_LABEL_PREFIX "_" 746 747/* This is how to store into the string LABEL 748 the symbol_ref name of an internal numbered label where 749 PREFIX is the class of label and NUM is the number within the class. 750 This is suitable for output with `assemble_name'. */ 751 752#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ 753 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) 754 755/* This is how to output an insn to push a register on the stack. 756 It need not be very fast code. */ 757 758#define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \ 759 fprintf (FILE, "\tpushl %s\n", reg_names[REGNO]) 760 761/* This is how to output an insn to pop a register from the stack. 762 It need not be very fast code. */ 763 764#define ASM_OUTPUT_REG_POP(FILE,REGNO) \ 765 fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM], \ 766 reg_names[REGNO]) 767 768/* This is how to output an element of a case-vector that is absolute. 769 (The VAX does not use such vectors, 770 but we must define this macro anyway.) */ 771 772#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 773 do \ 774 { \ 775 char label[256]; \ 776 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\ 777 fprintf (FILE, "\t.long "); \ 778 assemble_name (FILE, label); \ 779 fprintf (FILE, "\n"); \ 780 } \ 781 while (0) 782 783/* This is how to output an element of a case-vector that is relative. */ 784 785#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ 786 do \ 787 { \ 788 char label[256]; \ 789 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE)); \ 790 fprintf (FILE, "\t.word "); \ 791 assemble_name (FILE, label); \ 792 ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL)); \ 793 fprintf (FILE, "-"); \ 794 assemble_name (FILE, label); \ 795 fprintf (FILE, "\n"); \ 796 } \ 797 while (0) 798 799/* This is how to output an assembler line 800 that says to advance the location counter 801 to a multiple of 2**LOG bytes. */ 802 803#define ASM_OUTPUT_ALIGN(FILE,LOG) \ 804 fprintf (FILE, "\t.align %d\n", (LOG)) 805 806/* This is how to output an assembler line 807 that says to advance the location counter by SIZE bytes. */ 808 809#define ASM_OUTPUT_SKIP(FILE,SIZE) \ 810 fprintf (FILE, "\t.space %u\n", (int)(SIZE)) 811 812/* This says how to output an assembler line 813 to define a global common symbol. */ 814 815#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 816 ( fputs (".comm ", (FILE)), \ 817 assemble_name ((FILE), (NAME)), \ 818 fprintf ((FILE), ",%u\n", (int)(ROUNDED))) 819 820/* This says how to output an assembler line 821 to define a local common symbol. */ 822 823#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 824 ( fputs (".lcomm ", (FILE)), \ 825 assemble_name ((FILE), (NAME)), \ 826 fprintf ((FILE), ",%u\n", (int)(ROUNDED))) 827 828/* Store in OUTPUT a string (made with alloca) containing 829 an assembler-name for a local static variable named NAME. 830 LABELNO is an integer which is different for each call. */ 831 832#define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \ 833 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10), \ 834 sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO))) 835 836/* Print an instruction operand X on file FILE. 837 CODE is the code from the %-spec that requested printing this operand; 838 if `%z3' was used to print operand 3, then CODE is 'z'. 839 840VAX operand formatting codes: 841 842 letter print 843 C reverse branch condition 844 D 64-bit immediate operand 845 B the low 8 bits of the complement of a constant operand 846 H the low 16 bits of the complement of a constant operand 847 M a mask for the N highest bits of a word 848 N the complement of a constant integer operand 849 P constant operand plus 1 850 R 32 - constant operand 851 b the low 8 bits of a negated constant operand 852 h the low 16 bits of a negated constant operand 853 # 'd' or 'g' depending on whether dfloat or gfloat is used 854 | register prefix */ 855 856/* The purpose of D is to get around a quirk or bug in VAX assembler 857 whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff, 858 which is not a 64-bit minus one. As a workaround, we output negative 859 values in hex. */ 860#if HOST_BITS_PER_WIDE_INT == 64 861# define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX 862#else 863# define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx" 864#endif 865 866#define PRINT_OPERAND_PUNCT_VALID_P(CODE) \ 867 ((CODE) == '#' || (CODE) == '|') 868 869#define PRINT_OPERAND(FILE, X, CODE) \ 870{ if (CODE == '#') fputc (ASM_DOUBLE_CHAR, FILE); \ 871 else if (CODE == '|') \ 872 fputs (REGISTER_PREFIX, FILE); \ 873 else if (CODE == 'C') \ 874 fputs (rev_cond_name (X), FILE); \ 875 else if (CODE == 'D' && CONST_INT_P (X) && INTVAL (X) < 0) \ 876 fprintf (FILE, "$" NEG_HWI_PRINT_HEX16, INTVAL (X)); \ 877 else if (CODE == 'P' && CONST_INT_P (X)) \ 878 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, INTVAL (X) + 1); \ 879 else if (CODE == 'N' && CONST_INT_P (X)) \ 880 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, ~ INTVAL (X)); \ 881 /* rotl instruction cannot deal with negative arguments. */ \ 882 else if (CODE == 'R' && CONST_INT_P (X)) \ 883 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, 32 - INTVAL (X)); \ 884 else if (CODE == 'H' && CONST_INT_P (X)) \ 885 fprintf (FILE, "$%d", (int) (0xffff & ~ INTVAL (X))); \ 886 else if (CODE == 'h' && CONST_INT_P (X)) \ 887 fprintf (FILE, "$%d", (short) - INTVAL (x)); \ 888 else if (CODE == 'B' && CONST_INT_P (X)) \ 889 fprintf (FILE, "$%d", (int) (0xff & ~ INTVAL (X))); \ 890 else if (CODE == 'b' && CONST_INT_P (X)) \ 891 fprintf (FILE, "$%d", (int) (0xff & - INTVAL (X))); \ 892 else if (CODE == 'M' && CONST_INT_P (X)) \ 893 fprintf (FILE, "$%d", ~((1 << INTVAL (x)) - 1)); \ 894 else if (REG_P (X)) \ 895 fprintf (FILE, "%s", reg_names[REGNO (X)]); \ 896 else if (MEM_P (X)) \ 897 output_address (XEXP (X, 0)); \ 898 else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == SFmode) \ 899 { char dstr[30]; \ 900 real_to_decimal (dstr, CONST_DOUBLE_REAL_VALUE (X), \ 901 sizeof (dstr), 0, 1); \ 902 fprintf (FILE, "$0f%s", dstr); } \ 903 else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == DFmode) \ 904 { char dstr[30]; \ 905 real_to_decimal (dstr, CONST_DOUBLE_REAL_VALUE (X), \ 906 sizeof (dstr), 0, 1); \ 907 fprintf (FILE, "$0%c%s", ASM_DOUBLE_CHAR, dstr); } \ 908 else { putc ('$', FILE); output_addr_const (FILE, X); }} 909 910/* Print a memory operand whose address is X, on file FILE. 911 This uses a function in output-vax.c. */ 912 913#define PRINT_OPERAND_ADDRESS(FILE, ADDR) \ 914 print_operand_address (FILE, ADDR) 915 916/* This is a blatent lie. However, it's good enough, since we don't 917 actually have any code whatsoever for which this isn't overridden 918 by the proper FDE definition. */ 919#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM) 920 921