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, 2007, 2008, 2009 4 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3, or (at your option) 11 any later version. 12 13 GCC is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 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 /* Use BSD names for udiv and umod libgcc calls. */ 67 #define TARGET_BSD_DIVMOD 1 68 69 /* Default target_flags if no switches specified. */ 70 71 #ifndef TARGET_DEFAULT 72 #define TARGET_DEFAULT (MASK_UNIX_ASM) 73 #endif 74 75 #define OVERRIDE_OPTIONS override_options () 76 77 78 /* Target machine storage layout */ 79 80 /* Define this if most significant bit is lowest numbered 81 in instructions that operate on numbered bit-fields. 82 This is not true on the VAX. */ 83 #define BITS_BIG_ENDIAN 0 84 85 /* Define this if most significant byte of a word is the lowest numbered. */ 86 /* That is not true on the VAX. */ 87 #define BYTES_BIG_ENDIAN 0 88 89 /* Define this if most significant word of a multiword number is the lowest 90 numbered. */ 91 /* This is not true on the VAX. */ 92 #define WORDS_BIG_ENDIAN 0 93 94 /* Width of a word, in units (bytes). */ 95 #define UNITS_PER_WORD 4 96 97 /* Allocation boundary (in *bits*) for storing arguments in argument list. */ 98 #define PARM_BOUNDARY 32 99 100 /* Allocation boundary (in *bits*) for the code of a function. */ 101 #define FUNCTION_BOUNDARY 16 102 103 /* Alignment of field after `int : 0' in a structure. */ 104 #define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32) 105 106 /* Every structure's size must be a multiple of this. */ 107 #define STRUCTURE_SIZE_BOUNDARY 8 108 109 /* A bit-field declared as `int' forces `int' alignment for the struct. */ 110 #define PCC_BITFIELD_TYPE_MATTERS (! TARGET_VAXC_ALIGNMENT) 111 112 /* No data type wants to be aligned rounder than this. */ 113 #define BIGGEST_ALIGNMENT 32 114 115 /* No structure field wants to be aligned rounder than this. */ 116 #define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32) 117 118 /* Set this nonzero if move instructions will actually fail to work 119 when given unaligned data. */ 120 #define STRICT_ALIGNMENT 0 121 122 /* Let's keep the stack somewhat aligned. */ 123 #define STACK_BOUNDARY 32 124 125 /* The table of an ADDR_DIFF_VEC must be contiguous with the case 126 opcode, it is part of the case instruction. */ 127 #define ADDR_VEC_ALIGN(ADDR_VEC) 0 128 129 /* Standard register usage. */ 130 131 /* Number of actual hardware registers. 132 The hardware registers are assigned numbers for the compiler 133 from 0 to just below FIRST_PSEUDO_REGISTER. 134 All registers that the compiler knows about must be given numbers, 135 even those that are not normally considered general registers. */ 136 #define FIRST_PSEUDO_REGISTER 16 137 138 /* 1 for registers that have pervasive standard uses 139 and are not available for the register allocator. 140 On the VAX, these are the AP, FP, SP and PC. */ 141 #define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} 142 143 /* 1 for registers not available across function calls. 144 These must include the FIXED_REGISTERS and also any 145 registers that can be used without being saved. 146 The latter must include the registers where values are returned 147 and the register where structure-value addresses are passed. 148 Aside from that, you can include as many other registers as you like. */ 149 #define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} 150 151 /* Return number of consecutive hard regs needed starting at reg REGNO 152 to hold something of mode MODE. 153 This is ordinarily the length in words of a value of mode MODE 154 but can be less for certain modes in special long registers. 155 On the VAX, all registers are one word long. */ 156 #define HARD_REGNO_NREGS(REGNO, MODE) \ 157 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 158 159 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. 160 On the VAX, all registers can hold all modes. */ 161 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1 162 163 /* Value is 1 if it is a good idea to tie two pseudo registers 164 when one has mode MODE1 and one has mode MODE2. 165 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2, 166 for any hard reg, then this must be 0 for correct output. */ 167 #define MODES_TIEABLE_P(MODE1, MODE2) 1 168 169 /* Specify the registers used for certain standard purposes. 170 The values of these macros are register numbers. */ 171 172 /* VAX pc is overloaded on a register. */ 173 #define PC_REGNUM VAX_PC_REGNUM 174 175 /* Register to use for pushing function arguments. */ 176 #define STACK_POINTER_REGNUM VAX_SP_REGNUM 177 178 /* Base register for access to local variables of the function. */ 179 #define FRAME_POINTER_REGNUM VAX_FP_REGNUM 180 181 /* Offset from the frame pointer register value to the top of stack. */ 182 #define FRAME_POINTER_CFA_OFFSET(FNDECL) 0 183 184 /* 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. */ 216 217 enum 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 /* The following macro defines cover classes for Integrated Register 232 Allocator. Cover classes is a set of non-intersected register 233 classes covering all hard registers used for register allocation 234 purpose. Any move between two registers of a cover class should be 235 cheaper than load or store of the registers. The macro value is 236 array of register classes with LIM_REG_CLASSES used as the end 237 marker. */ 238 #define IRA_COVER_CLASSES { ALL_REGS, LIM_REG_CLASSES } 239 240 /* Return the maximum number of consecutive registers 241 needed to represent mode MODE in a register of class CLASS. */ 242 #define CLASS_MAX_NREGS(CLASS, MODE) \ 243 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 244 245 /* Define which registers fit in which classes. 246 This is an initializer for a vector of HARD_REG_SET 247 of length N_REG_CLASSES. */ 248 249 #define REG_CLASS_CONTENTS {{0}, {0xffff}} 250 251 /* The same information, inverted: 252 Return the class number of the smallest class containing 253 reg number REGNO. This could be a conditional expression 254 or could index an array. */ 255 256 #define REGNO_REG_CLASS(REGNO) ALL_REGS 257 258 /* The class value for index registers, and the one for base regs. */ 259 260 #define INDEX_REG_CLASS ALL_REGS 261 #define BASE_REG_CLASS ALL_REGS 262 263 /* Given an rtx X being reloaded into a reg required to be 264 in class CLASS, return the class of reg to actually use. 265 In general this is just CLASS; but on some machines 266 in some cases it is preferable to use a more restrictive class. */ 267 268 #define PREFERRED_RELOAD_CLASS(X,CLASS) (CLASS) 269 270 /* Return the maximum number of consecutive registers 271 needed to represent mode MODE in a register of class CLASS. */ 272 /* On the VAX, this is always the size of MODE in words, 273 since all registers are the same size. */ 274 #define CLASS_MAX_NREGS(CLASS, MODE) \ 275 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 276 277 /* Stack layout; function entry, exit and calling. */ 278 279 /* Define this if pushing a word on the stack 280 makes the stack pointer a smaller address. */ 281 #define STACK_GROWS_DOWNWARD 282 283 /* Define this to nonzero if the nominal address of the stack frame 284 is at the high-address end of the local variables; 285 that is, each additional local variable allocated 286 goes at a more negative offset in the frame. */ 287 #define FRAME_GROWS_DOWNWARD 1 288 289 /* Offset within stack frame to start allocating local variables at. 290 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the 291 first local allocated. Otherwise, it is the offset to the BEGINNING 292 of the first local allocated. */ 293 #define STARTING_FRAME_OFFSET 0 294 295 /* Given an rtx for the address of a frame, 296 return an rtx for the address of the word in the frame 297 that holds the dynamic chain--the previous frame's address. */ 298 #define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant ((FRAME), 12) 299 300 /* If we generate an insn to push BYTES bytes, 301 this says how many the stack pointer really advances by. 302 On the VAX, -(sp) pushes only the bytes of the operands. */ 303 #define PUSH_ROUNDING(BYTES) (BYTES) 304 305 /* Offset of first parameter from the argument pointer register value. */ 306 #define FIRST_PARM_OFFSET(FNDECL) 4 307 308 /* Value is the number of bytes of arguments automatically 309 popped when returning from a subroutine call. 310 FUNDECL is the declaration node of the function (as a tree), 311 FUNTYPE is the data type of the function (as a tree), 312 or for a library call it is an identifier node for the subroutine name. 313 SIZE is the number of bytes of arguments passed on the stack. 314 315 On the VAX, the RET insn pops a maximum of 255 args for any function. */ 316 317 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) \ 318 ((SIZE) > 255 * 4 ? 0 : (SIZE)) 319 320 /* Define how to find the value returned by a function. 321 VALTYPE is the data type of the value (as a tree). 322 If the precise function being called is known, FUNC is its FUNCTION_DECL; 323 otherwise, FUNC is 0. */ 324 325 /* On the VAX the return value is in R0 regardless. */ 326 327 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 328 gen_rtx_REG (TYPE_MODE (VALTYPE), 0) 329 330 /* Define how to find the value returned by a library function 331 assuming the value has mode MODE. */ 332 333 /* On the VAX the return value is in R0 regardless. */ 334 335 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, 0) 336 337 /* Define this if PCC uses the nonreentrant convention for returning 338 structure and union values. */ 339 340 #define PCC_STATIC_STRUCT_RETURN 341 342 /* 1 if N is a possible register number for a function value. 343 On the VAX, R0 is the only register thus used. */ 344 345 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0) 346 347 /* 1 if N is a possible register number for function argument passing. 348 On the VAX, no registers are used in this way. */ 349 350 #define FUNCTION_ARG_REGNO_P(N) 0 351 352 /* Define a data type for recording info about an argument list 353 during the scan of that argument list. This data type should 354 hold all necessary information about the function itself 355 and about the args processed so far, enough to enable macros 356 such as FUNCTION_ARG to determine where the next arg should go. 357 358 On the VAX, this is a single integer, which is a number of bytes 359 of arguments scanned so far. */ 360 361 #define CUMULATIVE_ARGS int 362 363 /* Initialize a variable CUM of type CUMULATIVE_ARGS 364 for a call to a function whose data type is FNTYPE. 365 For a library call, FNTYPE is 0. 366 367 On the VAX, the offset starts at 0. */ 368 369 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ 370 ((CUM) = 0) 371 372 /* Update the data in CUM to advance over an argument 373 of mode MODE and data type TYPE. 374 (TYPE is null for libcalls where that information may not be available.) */ 375 376 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \ 377 ((CUM) += ((MODE) != BLKmode \ 378 ? (GET_MODE_SIZE (MODE) + 3) & ~3 \ 379 : (int_size_in_bytes (TYPE) + 3) & ~3)) 380 381 /* Define where to put the arguments to a function. 382 Value is zero to push the argument on the stack, 383 or a hard register in which to store the argument. 384 385 MODE is the argument's machine mode. 386 TYPE is the data type of the argument (as a tree). 387 This is null for libcalls where that information may 388 not be available. 389 CUM is a variable of type CUMULATIVE_ARGS which gives info about 390 the preceding args and about the function being called. 391 NAMED is nonzero if this argument is a named parameter 392 (otherwise it is an extra parameter matching an ellipsis). */ 393 394 /* On the VAX all args are pushed. */ 395 396 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0 397 398 /* Output assembler code to FILE to increment profiler label # LABELNO 399 for profiling a function entry. */ 400 401 #define VAX_FUNCTION_PROFILER_NAME "mcount" 402 #define FUNCTION_PROFILER(FILE, LABELNO) \ 403 do \ 404 { \ 405 char label[256]; \ 406 ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO)); \ 407 fprintf (FILE, "\tmovab "); \ 408 assemble_name (FILE, label); \ 409 asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n", \ 410 VAX_FUNCTION_PROFILER_NAME); \ 411 } \ 412 while (0) 413 414 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function, 415 the stack pointer does not matter. The value is tested only in 416 functions that have frame pointers. 417 No definition is equivalent to always zero. */ 418 419 #define EXIT_IGNORE_STACK 1 420 421 /* Store in the variable DEPTH the initial difference between the 422 frame pointer reg contents and the stack pointer reg contents, 423 as of the start of the function body. This depends on the layout 424 of the fixed parts of the stack frame and on how registers are saved. 425 426 On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this 427 macro doesn't matter. But it must be defined. */ 428 429 #define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0; 430 431 /* Length in units of the trampoline for entering a nested function. */ 432 433 #define TRAMPOLINE_SIZE 15 434 435 /* Byte offset of return address in a stack frame. The "saved PC" field 436 is in element [4] when treating the frame as an array of longwords. */ 437 438 #define RETURN_ADDRESS_OFFSET (4 * UNITS_PER_WORD) /* 16 */ 439 440 /* A C expression whose value is RTL representing the value of the return 441 address for the frame COUNT steps up from the current frame. 442 FRAMEADDR is already the frame pointer of the COUNT frame, so we 443 can ignore COUNT. */ 444 445 #define RETURN_ADDR_RTX(COUNT, FRAME) \ 446 ((COUNT == 0) \ 447 ? gen_rtx_MEM (Pmode, plus_constant (FRAME, RETURN_ADDRESS_OFFSET)) \ 448 : (rtx) 0) 449 450 451 /* Addressing modes, and classification of registers for them. */ 452 453 #define HAVE_POST_INCREMENT 1 454 455 #define HAVE_PRE_DECREMENT 1 456 457 /* Macros to check register numbers against specific register classes. */ 458 459 /* These assume that REGNO is a hard or pseudo reg number. 460 They give nonzero only if REGNO is a hard reg of the suitable class 461 or a pseudo reg currently allocated to a suitable hard reg. 462 Since they use reg_renumber, they are safe only once reg_renumber 463 has been allocated, which happens in local-alloc.c. */ 464 465 #define REGNO_OK_FOR_INDEX_P(regno) \ 466 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) 467 #define REGNO_OK_FOR_BASE_P(regno) \ 468 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) 469 470 /* Maximum number of registers that can appear in a valid memory address. */ 471 472 #define MAX_REGS_PER_ADDRESS 2 473 474 /* 1 if X is an rtx for a constant that is a valid address. */ 475 476 #define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X) 477 478 /* Nonzero if the constant value X is a legitimate general operand. 479 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */ 480 481 #define LEGITIMATE_CONSTANT_P(X) legitimate_constant_p (X) 482 483 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx 484 and check its validity for a certain class. 485 We have two alternate definitions for each of them. 486 The usual definition accepts all pseudo regs; the other rejects 487 them unless they have been allocated suitable hard regs. 488 The symbol REG_OK_STRICT causes the latter definition to be used. 489 490 Most source files want to accept pseudo regs in the hope that 491 they will get allocated to the class that the insn wants them to be in. 492 Source files for reload pass need to be strict. 493 After reload, it makes no difference, since pseudo regs have 494 been eliminated by then. */ 495 496 #ifndef REG_OK_STRICT 497 498 /* Nonzero if X is a hard reg that can be used as an index 499 or if it is a pseudo reg. */ 500 #define REG_OK_FOR_INDEX_P(X) 1 501 502 /* Nonzero if X is a hard reg that can be used as a base reg 503 or if it is a pseudo reg. */ 504 #define REG_OK_FOR_BASE_P(X) 1 505 506 #else 507 508 /* Nonzero if X is a hard reg that can be used as an index. */ 509 #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X)) 510 511 /* Nonzero if X is a hard reg that can be used as a base reg. */ 512 #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X)) 513 514 #endif 515 516 /* Go to LABEL if ADDR (a legitimate address expression) 517 has an effect that depends on the machine mode it is used for. */ 518 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \ 519 { if (vax_mode_dependent_address_p (ADDR)) goto LABEL; } 520 521 /* Specify the machine mode that this machine uses 522 for the index in the tablejump instruction. */ 523 #define CASE_VECTOR_MODE HImode 524 525 /* Define as C expression which evaluates to nonzero if the tablejump 526 instruction expects the table to contain offsets from the address of the 527 table. 528 Do not define this if the table should contain absolute addresses. */ 529 #define CASE_VECTOR_PC_RELATIVE 1 530 531 /* Indicate that jump tables go in the text section. This is 532 necessary when compiling PIC code. */ 533 #define JUMP_TABLES_IN_TEXT_SECTION 1 534 535 /* Define this as 1 if `char' should by default be signed; else as 0. */ 536 #define DEFAULT_SIGNED_CHAR 1 537 538 /* This flag, if defined, says the same insns that convert to a signed fixnum 539 also convert validly to an unsigned one. */ 540 #define FIXUNS_TRUNC_LIKE_FIX_TRUNC 541 542 /* Max number of bytes we can move from memory to memory 543 in one reasonably fast instruction. */ 544 #define MOVE_MAX 8 545 546 /* If a memory-to-memory move would take MOVE_RATIO or more simple 547 move-instruction pairs, we will do a movmem or libcall instead. */ 548 #define MOVE_RATIO(speed) ((speed) ? 6 : 3) 549 #define CLEAR_RATIO(speed) ((speed) ? 6 : 2) 550 551 /* Nonzero if access to memory by bytes is slow and undesirable. */ 552 #define SLOW_BYTE_ACCESS 0 553 554 /* Define if shifts truncate the shift count 555 which implies one can omit a sign-extension or zero-extension 556 of a shift count. */ 557 /* #define SHIFT_COUNT_TRUNCATED */ 558 559 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits 560 is done just by pretending it is already truncated. */ 561 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 562 563 /* Specify the machine mode that pointers have. 564 After generation of rtl, the compiler makes no further distinction 565 between pointers and any other objects of this machine mode. */ 566 #define Pmode SImode 567 568 /* A function address in a call instruction 569 is a byte address (for indexing purposes) 570 so give the MEM rtx a byte's mode. */ 571 #define FUNCTION_MODE QImode 572 573 /* Specify the cost of a branch insn; roughly the number of extra insns that 574 should be added to avoid a branch. 575 576 Branches are extremely cheap on the VAX while the shift insns often 577 used to replace branches can be expensive. */ 578 579 #define BRANCH_COST(speed_p, predictable_p) 0 580 581 /* Tell final.c how to eliminate redundant test instructions. */ 582 583 /* Here we define machine-dependent flags and fields in cc_status 584 (see `conditions.h'). No extra ones are needed for the VAX. */ 585 586 /* Store in cc_status the expressions 587 that the condition codes will describe 588 after execution of an instruction whose pattern is EXP. 589 Do not alter them if the instruction would not alter the cc's. */ 590 591 #define NOTICE_UPDATE_CC(EXP, INSN) \ 592 vax_notice_update_cc ((EXP), (INSN)) 593 594 #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \ 595 { if (cc_status.flags & CC_NO_OVERFLOW) \ 596 return NO_OV; \ 597 return NORMAL; \ 598 } 599 600 /* Control the assembler format that we output. */ 601 602 /* A C string constant describing how to begin a comment in the target 603 assembler language. The compiler assumes that the comment will end at 604 the end of the line. */ 605 606 #define ASM_COMMENT_START "#" 607 608 /* Output to assembler file text saying following lines 609 may contain character constants, extra white space, comments, etc. */ 610 611 #define ASM_APP_ON "#APP\n" 612 613 /* Output to assembler file text saying following lines 614 no longer contain unusual constructs. */ 615 616 #define ASM_APP_OFF "#NO_APP\n" 617 618 /* Output before read-only data. */ 619 620 #define TEXT_SECTION_ASM_OP "\t.text" 621 622 /* Output before writable data. */ 623 624 #define DATA_SECTION_ASM_OP "\t.data" 625 626 /* How to refer to registers in assembler output. 627 This sequence is indexed by compiler's hard-register-number (see above). 628 The register names will be prefixed by REGISTER_PREFIX, if any. */ 629 630 #define REGISTER_PREFIX "" 631 #define REGISTER_NAMES \ 632 { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ 633 "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", } 634 635 /* This is BSD, so it wants DBX format. */ 636 637 #define DBX_DEBUGGING_INFO 1 638 639 /* Do not break .stabs pseudos into continuations. */ 640 641 #define DBX_CONTIN_LENGTH 0 642 643 /* This is the char to use for continuation (in case we need to turn 644 continuation back on). */ 645 646 #define DBX_CONTIN_CHAR '?' 647 648 /* Don't use the `xsfoo;' construct in DBX output; this system 649 doesn't support it. */ 650 651 #define DBX_NO_XREFS 652 653 /* Output the .stabs for a C `static' variable in the data section. */ 654 #define DBX_STATIC_STAB_DATA_SECTION 655 656 /* VAX specific: which type character is used for type double? */ 657 658 #define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd') 659 660 /* This is how to output a command to make the user-level label named NAME 661 defined for reference from other files. */ 662 663 /* Globalizing directive for a label. */ 664 #define GLOBAL_ASM_OP ".globl " 665 666 /* The prefix to add to user-visible assembler symbols. */ 667 668 #define USER_LABEL_PREFIX "_" 669 670 /* This is how to store into the string LABEL 671 the symbol_ref name of an internal numbered label where 672 PREFIX is the class of label and NUM is the number within the class. 673 This is suitable for output with `assemble_name'. */ 674 675 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ 676 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) 677 678 /* This is how to output an insn to push a register on the stack. 679 It need not be very fast code. */ 680 681 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \ 682 fprintf (FILE, "\tpushl %s\n", reg_names[REGNO]) 683 684 /* This is how to output an insn to pop a register from the stack. 685 It need not be very fast code. */ 686 687 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \ 688 fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM], \ 689 reg_names[REGNO]) 690 691 /* This is how to output an element of a case-vector that is absolute. 692 (The VAX does not use such vectors, 693 but we must define this macro anyway.) */ 694 695 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 696 do \ 697 { \ 698 char label[256]; \ 699 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\ 700 fprintf (FILE, "\t.long "); \ 701 assemble_name (FILE, label); \ 702 fprintf (FILE, "\n"); \ 703 } \ 704 while (0) 705 706 /* This is how to output an element of a case-vector that is relative. */ 707 708 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ 709 do \ 710 { \ 711 char label[256]; \ 712 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE)); \ 713 fprintf (FILE, "\t.word "); \ 714 assemble_name (FILE, label); \ 715 ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL)); \ 716 fprintf (FILE, "-"); \ 717 assemble_name (FILE, label); \ 718 fprintf (FILE, "\n"); \ 719 } \ 720 while (0) 721 722 /* This is how to output an assembler line 723 that says to advance the location counter 724 to a multiple of 2**LOG bytes. */ 725 726 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 727 fprintf (FILE, "\t.align %d\n", (LOG)) 728 729 /* This is how to output an assembler line 730 that says to advance the location counter by SIZE bytes. */ 731 732 #define ASM_OUTPUT_SKIP(FILE,SIZE) \ 733 fprintf (FILE, "\t.space %u\n", (int)(SIZE)) 734 735 /* This says how to output an assembler line 736 to define a global common symbol. */ 737 738 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 739 ( fputs (".comm ", (FILE)), \ 740 assemble_name ((FILE), (NAME)), \ 741 fprintf ((FILE), ",%u\n", (int)(ROUNDED))) 742 743 /* This says how to output an assembler line 744 to define a local common symbol. */ 745 746 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 747 ( fputs (".lcomm ", (FILE)), \ 748 assemble_name ((FILE), (NAME)), \ 749 fprintf ((FILE), ",%u\n", (int)(ROUNDED))) 750 751 /* Print an instruction operand X on file FILE. 752 CODE is the code from the %-spec that requested printing this operand; 753 if `%z3' was used to print operand 3, then CODE is 'z'. 754 755 VAX operand formatting codes: 756 757 letter print 758 c direct branch condition 759 C reverse branch condition 760 D 64-bit immediate operand 761 B the low 8 bits of the complement of a constant operand 762 H the low 16 bits of the complement of a constant operand 763 M a mask for the N highest bits of a word 764 N the complement of a constant integer operand 765 P constant operand plus 1 766 R 32 - constant operand 767 b the low 8 bits of a negated constant operand 768 h the low 16 bits of a negated constant operand 769 # 'd' or 'g' depending on whether dfloat or gfloat is used 770 | register prefix */ 771 772 /* The purpose of D is to get around a quirk or bug in VAX assembler 773 whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff, 774 which is not a 64-bit minus one. As a workaround, we output negative 775 values in hex. */ 776 #if HOST_BITS_PER_WIDE_INT == 64 777 # define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX 778 #else 779 # define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx" 780 #endif 781 782 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \ 783 ((CODE) == '#' || (CODE) == '|') 784 785 #define PRINT_OPERAND(FILE, X, CODE) \ 786 print_operand (FILE, X, CODE) 787 788 /* Print a memory operand whose address is X, on file FILE. 789 This uses a function in output-vax.c. */ 790 791 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \ 792 print_operand_address (FILE, ADDR) 793 794 /* This is a blatent lie. However, it's good enough, since we don't 795 actually have any code whatsoever for which this isn't overridden 796 by the proper FDE definition. */ 797 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM) 798 799