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6c842310 | 1 | /* Definitions of target machine for GNU compiler. VAX version. |
f1717362 | 2 | Copyright (C) 1987-2016 Free Software Foundation, Inc. |
823baf68 | 3 | |
67234554 | 4 | This file is part of GCC. |
823baf68 | 5 | |
67234554 | 6 | GCC is free software; you can redistribute it and/or modify |
823baf68 | 7 | it under the terms of the GNU General Public License as published by |
038d1e19 | 8 | the Free Software Foundation; either version 3, or (at your option) |
823baf68 | 9 | any later version. |
10 | ||
67234554 | 11 | GCC is distributed in the hope that it will be useful, |
823baf68 | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
038d1e19 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
823baf68 | 19 | |
20 | ||
b31ef245 | 21 | /* Target CPU builtins. */ |
22 | #define TARGET_CPU_CPP_BUILTINS() \ | |
23 | do \ | |
24 | { \ | |
25 | builtin_define ("__vax__"); \ | |
26 | builtin_assert ("cpu=vax"); \ | |
27 | builtin_assert ("machine=vax"); \ | |
28 | if (TARGET_G_FLOAT) \ | |
29 | { \ | |
30 | builtin_define ("__GFLOAT"); \ | |
31 | builtin_define ("__GFLOAT__"); \ | |
32 | } \ | |
33 | } \ | |
34 | while (0) | |
823baf68 | 35 | |
66d2837f | 36 | /* Use -J option for long branch support with Unix assembler. */ |
f2165804 | 37 | |
38 | #define ASM_SPEC "-J" | |
39 | ||
823baf68 | 40 | /* Choose proper libraries depending on float format. |
41 | Note that there are no profiling libraries for g-format. | |
42 | Also use -lg for the sake of dbx. */ | |
43 | ||
44 | #define LIB_SPEC "%{g:-lg}\ | |
45 | %{mg:%{lm:-lmg} -lcg \ | |
46 | %{p:%eprofiling not supported with -mg\n}\ | |
47 | %{pg:%eprofiling not supported with -mg\n}}\ | |
48 | %{!mg:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}" | |
49 | ||
823baf68 | 50 | /* Run-time compilation parameters selecting different hardware subsets. */ |
51 | ||
f2f543a3 | 52 | /* Nonzero if ELF. Redefined by vax/elf.h. */ |
53 | #define TARGET_ELF 0 | |
54 | ||
91ec62fb | 55 | /* Use BSD names for udiv and umod libgcc calls. */ |
56 | #define TARGET_BSD_DIVMOD 1 | |
57 | ||
823baf68 | 58 | /* Default target_flags if no switches specified. */ |
59 | ||
60 | #ifndef TARGET_DEFAULT | |
0360d099 | 61 | #define TARGET_DEFAULT (MASK_UNIX_ASM) |
823baf68 | 62 | #endif |
1268285a | 63 | |
823baf68 | 64 | \f |
65 | /* Target machine storage layout */ | |
66 | ||
67 | /* Define this if most significant bit is lowest numbered | |
68 | in instructions that operate on numbered bit-fields. | |
6c842310 | 69 | This is not true on the VAX. */ |
823baf68 | 70 | #define BITS_BIG_ENDIAN 0 |
71 | ||
72 | /* Define this if most significant byte of a word is the lowest numbered. */ | |
6c842310 | 73 | /* That is not true on the VAX. */ |
823baf68 | 74 | #define BYTES_BIG_ENDIAN 0 |
75 | ||
76 | /* Define this if most significant word of a multiword number is the lowest | |
77 | numbered. */ | |
6c842310 | 78 | /* This is not true on the VAX. */ |
823baf68 | 79 | #define WORDS_BIG_ENDIAN 0 |
80 | ||
823baf68 | 81 | /* Width of a word, in units (bytes). */ |
82 | #define UNITS_PER_WORD 4 | |
83 | ||
823baf68 | 84 | /* Allocation boundary (in *bits*) for storing arguments in argument list. */ |
85 | #define PARM_BOUNDARY 32 | |
86 | ||
87 | /* Allocation boundary (in *bits*) for the code of a function. */ | |
88 | #define FUNCTION_BOUNDARY 16 | |
89 | ||
90 | /* Alignment of field after `int : 0' in a structure. */ | |
91 | #define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32) | |
92 | ||
93 | /* Every structure's size must be a multiple of this. */ | |
94 | #define STRUCTURE_SIZE_BOUNDARY 8 | |
95 | ||
ceb2fe0f | 96 | /* A bit-field declared as `int' forces `int' alignment for the struct. */ |
6718899e | 97 | #define PCC_BITFIELD_TYPE_MATTERS (! TARGET_VAXC_ALIGNMENT) |
823baf68 | 98 | |
99 | /* No data type wants to be aligned rounder than this. */ | |
100 | #define BIGGEST_ALIGNMENT 32 | |
101 | ||
102 | /* No structure field wants to be aligned rounder than this. */ | |
103 | #define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32) | |
104 | ||
128841b5 | 105 | /* Set this nonzero if move instructions will actually fail to work |
823baf68 | 106 | when given unaligned data. */ |
128841b5 | 107 | #define STRICT_ALIGNMENT 0 |
bdf74c8a | 108 | |
109 | /* Let's keep the stack somewhat aligned. */ | |
110 | #define STACK_BOUNDARY 32 | |
42cfc9f4 | 111 | |
112 | /* The table of an ADDR_DIFF_VEC must be contiguous with the case | |
113 | opcode, it is part of the case instruction. */ | |
114 | #define ADDR_VEC_ALIGN(ADDR_VEC) 0 | |
823baf68 | 115 | \f |
116 | /* Standard register usage. */ | |
117 | ||
118 | /* Number of actual hardware registers. | |
119 | The hardware registers are assigned numbers for the compiler | |
120 | from 0 to just below FIRST_PSEUDO_REGISTER. | |
121 | All registers that the compiler knows about must be given numbers, | |
122 | even those that are not normally considered general registers. */ | |
123 | #define FIRST_PSEUDO_REGISTER 16 | |
124 | ||
125 | /* 1 for registers that have pervasive standard uses | |
126 | and are not available for the register allocator. | |
6c842310 | 127 | On the VAX, these are the AP, FP, SP and PC. */ |
823baf68 | 128 | #define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} |
129 | ||
130 | /* 1 for registers not available across function calls. | |
131 | These must include the FIXED_REGISTERS and also any | |
132 | registers that can be used without being saved. | |
133 | The latter must include the registers where values are returned | |
134 | and the register where structure-value addresses are passed. | |
135 | Aside from that, you can include as many other registers as you like. */ | |
136 | #define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} | |
137 | ||
138 | /* Return number of consecutive hard regs needed starting at reg REGNO | |
139 | to hold something of mode MODE. | |
140 | This is ordinarily the length in words of a value of mode MODE | |
141 | but can be less for certain modes in special long registers. | |
6c842310 | 142 | On the VAX, all registers are one word long. */ |
58a58d86 | 143 | #define HARD_REGNO_NREGS(REGNO, MODE) \ |
144 | ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) | |
823baf68 | 145 | |
146 | /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. | |
6c842310 | 147 | On the VAX, all registers can hold all modes. */ |
823baf68 | 148 | #define HARD_REGNO_MODE_OK(REGNO, MODE) 1 |
149 | ||
150 | /* Value is 1 if it is a good idea to tie two pseudo registers | |
151 | when one has mode MODE1 and one has mode MODE2. | |
152 | If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2, | |
153 | for any hard reg, then this must be 0 for correct output. */ | |
154 | #define MODES_TIEABLE_P(MODE1, MODE2) 1 | |
155 | ||
156 | /* Specify the registers used for certain standard purposes. | |
157 | The values of these macros are register numbers. */ | |
158 | ||
6c842310 | 159 | /* VAX pc is overloaded on a register. */ |
b2e42e74 | 160 | #define PC_REGNUM VAX_PC_REGNUM |
823baf68 | 161 | |
162 | /* Register to use for pushing function arguments. */ | |
b2e42e74 | 163 | #define STACK_POINTER_REGNUM VAX_SP_REGNUM |
823baf68 | 164 | |
165 | /* Base register for access to local variables of the function. */ | |
b2e42e74 | 166 | #define FRAME_POINTER_REGNUM VAX_FP_REGNUM |
823baf68 | 167 | |
6718899e | 168 | /* Offset from the frame pointer register value to the top of stack. */ |
169 | #define FRAME_POINTER_CFA_OFFSET(FNDECL) 0 | |
170 | ||
823baf68 | 171 | /* Base register for access to arguments of the function. */ |
b2e42e74 | 172 | #define ARG_POINTER_REGNUM VAX_AP_REGNUM |
823baf68 | 173 | |
174 | /* Register in which static-chain is passed to a function. */ | |
175 | #define STATIC_CHAIN_REGNUM 0 | |
176 | ||
177 | /* Register in which address to store a structure value | |
178 | is passed to a function. */ | |
64dbec6f | 179 | #define VAX_STRUCT_VALUE_REGNUM 1 |
823baf68 | 180 | \f |
181 | /* Define the classes of registers for register constraints in the | |
182 | machine description. Also define ranges of constants. | |
183 | ||
184 | One of the classes must always be named ALL_REGS and include all hard regs. | |
185 | If there is more than one class, another class must be named NO_REGS | |
186 | and contain no registers. | |
187 | ||
188 | The name GENERAL_REGS must be the name of a class (or an alias for | |
189 | another name such as ALL_REGS). This is the class of registers | |
190 | that is allowed by "g" or "r" in a register constraint. | |
191 | Also, registers outside this class are allocated only when | |
192 | instructions express preferences for them. | |
193 | ||
194 | The classes must be numbered in nondecreasing order; that is, | |
195 | a larger-numbered class must never be contained completely | |
196 | in a smaller-numbered class. | |
197 | ||
198 | For any two classes, it is very desirable that there be another | |
199 | class that represents their union. */ | |
58a58d86 | 200 | |
6c842310 | 201 | /* The VAX has only one kind of registers, so NO_REGS and ALL_REGS |
823baf68 | 202 | are the only classes. */ |
203 | ||
204 | enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES }; | |
205 | ||
206 | #define N_REG_CLASSES (int) LIM_REG_CLASSES | |
207 | ||
208 | /* Since GENERAL_REGS is the same class as ALL_REGS, | |
209 | don't give it a different class number; just make it an alias. */ | |
210 | ||
211 | #define GENERAL_REGS ALL_REGS | |
212 | ||
66d2837f | 213 | /* Give names of register classes as strings for dump file. */ |
823baf68 | 214 | |
58a58d86 | 215 | #define REG_CLASS_NAMES \ |
216 | { "NO_REGS", "ALL_REGS" } | |
823baf68 | 217 | |
218 | /* Define which registers fit in which classes. | |
219 | This is an initializer for a vector of HARD_REG_SET | |
220 | of length N_REG_CLASSES. */ | |
221 | ||
559c7180 | 222 | #define REG_CLASS_CONTENTS {{0}, {0xffff}} |
823baf68 | 223 | |
224 | /* The same information, inverted: | |
225 | Return the class number of the smallest class containing | |
226 | reg number REGNO. This could be a conditional expression | |
227 | or could index an array. */ | |
228 | ||
229 | #define REGNO_REG_CLASS(REGNO) ALL_REGS | |
230 | ||
231 | /* The class value for index registers, and the one for base regs. */ | |
232 | ||
233 | #define INDEX_REG_CLASS ALL_REGS | |
234 | #define BASE_REG_CLASS ALL_REGS | |
235 | ||
823baf68 | 236 | \f |
237 | /* Stack layout; function entry, exit and calling. */ | |
238 | ||
239 | /* Define this if pushing a word on the stack | |
240 | makes the stack pointer a smaller address. */ | |
2b785411 | 241 | #define STACK_GROWS_DOWNWARD 1 |
823baf68 | 242 | |
3ce7ff97 | 243 | /* Define this to nonzero if the nominal address of the stack frame |
823baf68 | 244 | is at the high-address end of the local variables; |
245 | that is, each additional local variable allocated | |
246 | goes at a more negative offset in the frame. */ | |
d28d5017 | 247 | #define FRAME_GROWS_DOWNWARD 1 |
823baf68 | 248 | |
249 | /* Offset within stack frame to start allocating local variables at. | |
250 | If FRAME_GROWS_DOWNWARD, this is the offset to the END of the | |
251 | first local allocated. Otherwise, it is the offset to the BEGINNING | |
252 | of the first local allocated. */ | |
253 | #define STARTING_FRAME_OFFSET 0 | |
254 | ||
f914fa8f | 255 | /* Given an rtx for the address of a frame, |
256 | return an rtx for the address of the word in the frame | |
257 | that holds the dynamic chain--the previous frame's address. */ | |
29c05e22 | 258 | #define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant (Pmode, (FRAME), 12) |
f914fa8f | 259 | |
823baf68 | 260 | /* If we generate an insn to push BYTES bytes, |
261 | this says how many the stack pointer really advances by. | |
6c842310 | 262 | On the VAX, -(sp) pushes only the bytes of the operands. */ |
823baf68 | 263 | #define PUSH_ROUNDING(BYTES) (BYTES) |
264 | ||
265 | /* Offset of first parameter from the argument pointer register value. */ | |
266 | #define FIRST_PARM_OFFSET(FNDECL) 4 | |
267 | ||
823baf68 | 268 | /* Define how to find the value returned by a function. |
269 | VALTYPE is the data type of the value (as a tree). | |
270 | If the precise function being called is known, FUNC is its FUNCTION_DECL; | |
271 | otherwise, FUNC is 0. */ | |
272 | ||
58a58d86 | 273 | /* On the VAX the return value is in R0 regardless. */ |
823baf68 | 274 | |
58a58d86 | 275 | #define FUNCTION_VALUE(VALTYPE, FUNC) \ |
7014838c | 276 | gen_rtx_REG (TYPE_MODE (VALTYPE), 0) |
823baf68 | 277 | |
278 | /* Define how to find the value returned by a library function | |
279 | assuming the value has mode MODE. */ | |
280 | ||
58a58d86 | 281 | /* On the VAX the return value is in R0 regardless. */ |
823baf68 | 282 | |
7014838c | 283 | #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, 0) |
823baf68 | 284 | |
285 | /* Define this if PCC uses the nonreentrant convention for returning | |
286 | structure and union values. */ | |
287 | ||
288 | #define PCC_STATIC_STRUCT_RETURN | |
289 | ||
290 | /* 1 if N is a possible register number for a function value. | |
6c842310 | 291 | On the VAX, R0 is the only register thus used. */ |
823baf68 | 292 | |
293 | #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0) | |
294 | ||
295 | /* 1 if N is a possible register number for function argument passing. | |
6c842310 | 296 | On the VAX, no registers are used in this way. */ |
823baf68 | 297 | |
abe8007e | 298 | #define FUNCTION_ARG_REGNO_P(N) ((void) (N), 0) |
823baf68 | 299 | \f |
300 | /* Define a data type for recording info about an argument list | |
301 | during the scan of that argument list. This data type should | |
302 | hold all necessary information about the function itself | |
303 | and about the args processed so far, enough to enable macros | |
304 | such as FUNCTION_ARG to determine where the next arg should go. | |
305 | ||
6c842310 | 306 | On the VAX, this is a single integer, which is a number of bytes |
823baf68 | 307 | of arguments scanned so far. */ |
308 | ||
309 | #define CUMULATIVE_ARGS int | |
310 | ||
311 | /* Initialize a variable CUM of type CUMULATIVE_ARGS | |
312 | for a call to a function whose data type is FNTYPE. | |
313 | For a library call, FNTYPE is 0. | |
314 | ||
6c842310 | 315 | On the VAX, the offset starts at 0. */ |
823baf68 | 316 | |
30c70355 | 317 | #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ |
823baf68 | 318 | ((CUM) = 0) |
319 | ||
823baf68 | 320 | /* Output assembler code to FILE to increment profiler label # LABELNO |
321 | for profiling a function entry. */ | |
322 | ||
649ecb2c | 323 | #define VAX_FUNCTION_PROFILER_NAME "mcount" |
324 | #define FUNCTION_PROFILER(FILE, LABELNO) \ | |
325 | do \ | |
326 | { \ | |
327 | char label[256]; \ | |
328 | ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO)); \ | |
329 | fprintf (FILE, "\tmovab "); \ | |
330 | assemble_name (FILE, label); \ | |
331 | asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n", \ | |
332 | VAX_FUNCTION_PROFILER_NAME); \ | |
333 | } \ | |
334 | while (0) | |
823baf68 | 335 | |
823baf68 | 336 | /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function, |
337 | the stack pointer does not matter. The value is tested only in | |
338 | functions that have frame pointers. | |
339 | No definition is equivalent to always zero. */ | |
340 | ||
341 | #define EXIT_IGNORE_STACK 1 | |
342 | ||
823baf68 | 343 | /* Store in the variable DEPTH the initial difference between the |
344 | frame pointer reg contents and the stack pointer reg contents, | |
345 | as of the start of the function body. This depends on the layout | |
346 | of the fixed parts of the stack frame and on how registers are saved. | |
347 | ||
6c842310 | 348 | On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this |
823baf68 | 349 | macro doesn't matter. But it must be defined. */ |
350 | ||
351 | #define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0; | |
352 | ||
823baf68 | 353 | /* Length in units of the trampoline for entering a nested function. */ |
354 | ||
355 | #define TRAMPOLINE_SIZE 15 | |
356 | ||
b177c11b | 357 | /* Byte offset of return address in a stack frame. The "saved PC" field |
358 | is in element [4] when treating the frame as an array of longwords. */ | |
359 | ||
360 | #define RETURN_ADDRESS_OFFSET (4 * UNITS_PER_WORD) /* 16 */ | |
361 | ||
362 | /* A C expression whose value is RTL representing the value of the return | |
363 | address for the frame COUNT steps up from the current frame. | |
364 | FRAMEADDR is already the frame pointer of the COUNT frame, so we | |
365 | can ignore COUNT. */ | |
366 | ||
58a58d86 | 367 | #define RETURN_ADDR_RTX(COUNT, FRAME) \ |
368 | ((COUNT == 0) \ | |
29c05e22 | 369 | ? gen_rtx_MEM (Pmode, plus_constant (Pmode, FRAME, \ |
370 | RETURN_ADDRESS_OFFSET)) \ | |
d5919515 | 371 | : (rtx) 0) |
b177c11b | 372 | |
823baf68 | 373 | \f |
374 | /* Addressing modes, and classification of registers for them. */ | |
375 | ||
e4e498cf | 376 | #define HAVE_POST_INCREMENT 1 |
823baf68 | 377 | |
e4e498cf | 378 | #define HAVE_PRE_DECREMENT 1 |
823baf68 | 379 | |
380 | /* Macros to check register numbers against specific register classes. */ | |
381 | ||
382 | /* These assume that REGNO is a hard or pseudo reg number. | |
383 | They give nonzero only if REGNO is a hard reg of the suitable class | |
384 | or a pseudo reg currently allocated to a suitable hard reg. | |
385 | Since they use reg_renumber, they are safe only once reg_renumber | |
957b2bdc | 386 | has been allocated, which happens in reginfo.c during register |
387 | allocation. */ | |
823baf68 | 388 | |
58a58d86 | 389 | #define REGNO_OK_FOR_INDEX_P(regno) \ |
390 | ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) | |
391 | #define REGNO_OK_FOR_BASE_P(regno) \ | |
392 | ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) | |
823baf68 | 393 | \f |
394 | /* Maximum number of registers that can appear in a valid memory address. */ | |
395 | ||
396 | #define MAX_REGS_PER_ADDRESS 2 | |
397 | ||
398 | /* 1 if X is an rtx for a constant that is a valid address. */ | |
399 | ||
d0964ecc | 400 | #define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X) |
823baf68 | 401 | |
823baf68 | 402 | /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx |
403 | and check its validity for a certain class. | |
404 | We have two alternate definitions for each of them. | |
405 | The usual definition accepts all pseudo regs; the other rejects | |
406 | them unless they have been allocated suitable hard regs. | |
407 | The symbol REG_OK_STRICT causes the latter definition to be used. | |
408 | ||
409 | Most source files want to accept pseudo regs in the hope that | |
410 | they will get allocated to the class that the insn wants them to be in. | |
411 | Source files for reload pass need to be strict. | |
412 | After reload, it makes no difference, since pseudo regs have | |
413 | been eliminated by then. */ | |
414 | ||
415 | #ifndef REG_OK_STRICT | |
416 | ||
417 | /* Nonzero if X is a hard reg that can be used as an index | |
418 | or if it is a pseudo reg. */ | |
419 | #define REG_OK_FOR_INDEX_P(X) 1 | |
d0964ecc | 420 | |
823baf68 | 421 | /* Nonzero if X is a hard reg that can be used as a base reg |
422 | or if it is a pseudo reg. */ | |
423 | #define REG_OK_FOR_BASE_P(X) 1 | |
424 | ||
425 | #else | |
426 | ||
427 | /* Nonzero if X is a hard reg that can be used as an index. */ | |
428 | #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X)) | |
d0964ecc | 429 | |
823baf68 | 430 | /* Nonzero if X is a hard reg that can be used as a base reg. */ |
431 | #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X)) | |
432 | ||
d0964ecc | 433 | #endif |
823baf68 | 434 | \f |
435 | /* Specify the machine mode that this machine uses | |
436 | for the index in the tablejump instruction. */ | |
437 | #define CASE_VECTOR_MODE HImode | |
438 | ||
25d1d1e9 | 439 | /* Define as C expression which evaluates to nonzero if the tablejump |
440 | instruction expects the table to contain offsets from the address of the | |
441 | table. | |
66d2837f | 442 | Do not define this if the table should contain absolute addresses. */ |
25d1d1e9 | 443 | #define CASE_VECTOR_PC_RELATIVE 1 |
823baf68 | 444 | |
bb80c7b8 | 445 | /* Indicate that jump tables go in the text section. This is |
446 | necessary when compiling PIC code. */ | |
447 | #define JUMP_TABLES_IN_TEXT_SECTION 1 | |
448 | ||
823baf68 | 449 | /* Define this as 1 if `char' should by default be signed; else as 0. */ |
450 | #define DEFAULT_SIGNED_CHAR 1 | |
451 | ||
823baf68 | 452 | /* Max number of bytes we can move from memory to memory |
453 | in one reasonably fast instruction. */ | |
454 | #define MOVE_MAX 8 | |
455 | ||
6718899e | 456 | /* If a memory-to-memory move would take MOVE_RATIO or more simple |
457 | move-instruction pairs, we will do a movmem or libcall instead. */ | |
458 | #define MOVE_RATIO(speed) ((speed) ? 6 : 3) | |
459 | #define CLEAR_RATIO(speed) ((speed) ? 6 : 2) | |
460 | ||
823baf68 | 461 | /* Nonzero if access to memory by bytes is slow and undesirable. */ |
462 | #define SLOW_BYTE_ACCESS 0 | |
463 | ||
464 | /* Define if shifts truncate the shift count | |
465 | which implies one can omit a sign-extension or zero-extension | |
466 | of a shift count. */ | |
467 | /* #define SHIFT_COUNT_TRUNCATED */ | |
468 | ||
469 | /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits | |
470 | is done just by pretending it is already truncated. */ | |
471 | #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 | |
472 | ||
473 | /* Specify the machine mode that pointers have. | |
474 | After generation of rtl, the compiler makes no further distinction | |
475 | between pointers and any other objects of this machine mode. */ | |
476 | #define Pmode SImode | |
477 | ||
478 | /* A function address in a call instruction | |
479 | is a byte address (for indexing purposes) | |
480 | so give the MEM rtx a byte's mode. */ | |
481 | #define FUNCTION_MODE QImode | |
482 | ||
823baf68 | 483 | /* Specify the cost of a branch insn; roughly the number of extra insns that |
484 | should be added to avoid a branch. | |
485 | ||
486 | Branches are extremely cheap on the VAX while the shift insns often | |
487 | used to replace branches can be expensive. */ | |
488 | ||
4a9d7ef7 | 489 | #define BRANCH_COST(speed_p, predictable_p) 0 |
823baf68 | 490 | \f |
491 | /* Tell final.c how to eliminate redundant test instructions. */ | |
492 | ||
493 | /* Here we define machine-dependent flags and fields in cc_status | |
6c842310 | 494 | (see `conditions.h'). No extra ones are needed for the VAX. */ |
823baf68 | 495 | |
496 | /* Store in cc_status the expressions | |
497 | that the condition codes will describe | |
498 | after execution of an instruction whose pattern is EXP. | |
499 | Do not alter them if the instruction would not alter the cc's. */ | |
500 | ||
58a58d86 | 501 | #define NOTICE_UPDATE_CC(EXP, INSN) \ |
339a372c | 502 | vax_notice_update_cc ((EXP), (INSN)) |
823baf68 | 503 | |
58a58d86 | 504 | #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \ |
505 | { if (cc_status.flags & CC_NO_OVERFLOW) \ | |
506 | return NO_OV; \ | |
507 | return NORMAL; \ | |
508 | } | |
823baf68 | 509 | \f |
510 | /* Control the assembler format that we output. */ | |
511 | ||
2acf2acb | 512 | /* A C string constant describing how to begin a comment in the target |
513 | assembler language. The compiler assumes that the comment will end at | |
514 | the end of the line. */ | |
515 | ||
516 | #define ASM_COMMENT_START "#" | |
517 | ||
823baf68 | 518 | /* Output to assembler file text saying following lines |
519 | may contain character constants, extra white space, comments, etc. */ | |
520 | ||
521 | #define ASM_APP_ON "#APP\n" | |
522 | ||
523 | /* Output to assembler file text saying following lines | |
524 | no longer contain unusual constructs. */ | |
525 | ||
526 | #define ASM_APP_OFF "#NO_APP\n" | |
527 | ||
528 | /* Output before read-only data. */ | |
529 | ||
327b40b7 | 530 | #define TEXT_SECTION_ASM_OP "\t.text" |
823baf68 | 531 | |
532 | /* Output before writable data. */ | |
533 | ||
327b40b7 | 534 | #define DATA_SECTION_ASM_OP "\t.data" |
823baf68 | 535 | |
536 | /* How to refer to registers in assembler output. | |
fbc79bbe | 537 | This sequence is indexed by compiler's hard-register-number (see above). |
538 | The register names will be prefixed by REGISTER_PREFIX, if any. */ | |
823baf68 | 539 | |
fbc79bbe | 540 | #define REGISTER_PREFIX "" |
58a58d86 | 541 | #define REGISTER_NAMES \ |
542 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
543 | "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", } | |
823baf68 | 544 | |
545 | /* This is BSD, so it wants DBX format. */ | |
546 | ||
a4cad234 | 547 | #define DBX_DEBUGGING_INFO 1 |
823baf68 | 548 | |
823baf68 | 549 | /* Do not break .stabs pseudos into continuations. */ |
550 | ||
551 | #define DBX_CONTIN_LENGTH 0 | |
552 | ||
553 | /* This is the char to use for continuation (in case we need to turn | |
554 | continuation back on). */ | |
555 | ||
556 | #define DBX_CONTIN_CHAR '?' | |
557 | ||
558 | /* Don't use the `xsfoo;' construct in DBX output; this system | |
559 | doesn't support it. */ | |
560 | ||
561 | #define DBX_NO_XREFS | |
562 | ||
563 | /* Output the .stabs for a C `static' variable in the data section. */ | |
564 | #define DBX_STATIC_STAB_DATA_SECTION | |
565 | ||
6c842310 | 566 | /* VAX specific: which type character is used for type double? */ |
823baf68 | 567 | |
568 | #define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd') | |
569 | ||
823baf68 | 570 | /* This is how to output a command to make the user-level label named NAME |
571 | defined for reference from other files. */ | |
572 | ||
0036ad94 | 573 | /* Globalizing directive for a label. */ |
574 | #define GLOBAL_ASM_OP ".globl " | |
823baf68 | 575 | |
66d2837f | 576 | /* The prefix to add to user-visible assembler symbols. */ |
823baf68 | 577 | |
bee1420b | 578 | #define USER_LABEL_PREFIX "_" |
823baf68 | 579 | |
823baf68 | 580 | /* This is how to store into the string LABEL |
581 | the symbol_ref name of an internal numbered label where | |
582 | PREFIX is the class of label and NUM is the number within the class. | |
583 | This is suitable for output with `assemble_name'. */ | |
584 | ||
585 | #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ | |
933a889c | 586 | sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) |
823baf68 | 587 | |
823baf68 | 588 | /* This is how to output an insn to push a register on the stack. |
589 | It need not be very fast code. */ | |
590 | ||
591 | #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \ | |
592 | fprintf (FILE, "\tpushl %s\n", reg_names[REGNO]) | |
593 | ||
594 | /* This is how to output an insn to pop a register from the stack. | |
595 | It need not be very fast code. */ | |
596 | ||
58a58d86 | 597 | #define ASM_OUTPUT_REG_POP(FILE,REGNO) \ |
598 | fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM], \ | |
bb80c7b8 | 599 | reg_names[REGNO]) |
823baf68 | 600 | |
601 | /* This is how to output an element of a case-vector that is absolute. | |
6c842310 | 602 | (The VAX does not use such vectors, |
823baf68 | 603 | but we must define this macro anyway.) */ |
604 | ||
bb80c7b8 | 605 | #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ |
606 | do \ | |
607 | { \ | |
608 | char label[256]; \ | |
609 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\ | |
610 | fprintf (FILE, "\t.long "); \ | |
611 | assemble_name (FILE, label); \ | |
612 | fprintf (FILE, "\n"); \ | |
613 | } \ | |
614 | while (0) | |
823baf68 | 615 | |
616 | /* This is how to output an element of a case-vector that is relative. */ | |
617 | ||
bb80c7b8 | 618 | #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ |
619 | do \ | |
620 | { \ | |
621 | char label[256]; \ | |
622 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE)); \ | |
623 | fprintf (FILE, "\t.word "); \ | |
624 | assemble_name (FILE, label); \ | |
625 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL)); \ | |
626 | fprintf (FILE, "-"); \ | |
627 | assemble_name (FILE, label); \ | |
628 | fprintf (FILE, "\n"); \ | |
629 | } \ | |
630 | while (0) | |
823baf68 | 631 | |
632 | /* This is how to output an assembler line | |
633 | that says to advance the location counter | |
634 | to a multiple of 2**LOG bytes. */ | |
635 | ||
636 | #define ASM_OUTPUT_ALIGN(FILE,LOG) \ | |
637 | fprintf (FILE, "\t.align %d\n", (LOG)) | |
638 | ||
639 | /* This is how to output an assembler line | |
640 | that says to advance the location counter by SIZE bytes. */ | |
641 | ||
642 | #define ASM_OUTPUT_SKIP(FILE,SIZE) \ | |
d716c068 | 643 | fprintf (FILE, "\t.space %u\n", (int)(SIZE)) |
823baf68 | 644 | |
645 | /* This says how to output an assembler line | |
646 | to define a global common symbol. */ | |
647 | ||
58a58d86 | 648 | #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ |
649 | ( fputs (".comm ", (FILE)), \ | |
650 | assemble_name ((FILE), (NAME)), \ | |
651 | fprintf ((FILE), ",%u\n", (int)(ROUNDED))) | |
823baf68 | 652 | |
653 | /* This says how to output an assembler line | |
654 | to define a local common symbol. */ | |
655 | ||
58a58d86 | 656 | #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ |
657 | ( fputs (".lcomm ", (FILE)), \ | |
658 | assemble_name ((FILE), (NAME)), \ | |
659 | fprintf ((FILE), ",%u\n", (int)(ROUNDED))) | |
823baf68 | 660 | |
823baf68 | 661 | /* Print an instruction operand X on file FILE. |
662 | CODE is the code from the %-spec that requested printing this operand; | |
663 | if `%z3' was used to print operand 3, then CODE is 'z'. | |
1af8dc9f | 664 | |
665 | VAX operand formatting codes: | |
666 | ||
667 | letter print | |
74f4459c | 668 | c direct branch condition |
1af8dc9f | 669 | C reverse branch condition |
2b374196 | 670 | D 64-bit immediate operand |
1af8dc9f | 671 | B the low 8 bits of the complement of a constant operand |
672 | H the low 16 bits of the complement of a constant operand | |
9b9bbbc8 | 673 | M a mask for the N highest bits of a word |
1af8dc9f | 674 | N the complement of a constant integer operand |
675 | P constant operand plus 1 | |
676 | R 32 - constant operand | |
677 | b the low 8 bits of a negated constant operand | |
678 | h the low 16 bits of a negated constant operand | |
649ecb2c | 679 | # 'd' or 'g' depending on whether dfloat or gfloat is used |
680 | | register prefix */ | |
823baf68 | 681 | |
6c842310 | 682 | /* The purpose of D is to get around a quirk or bug in VAX assembler |
2b374196 | 683 | whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff, |
2acf2acb | 684 | which is not a 64-bit minus one. As a workaround, we output negative |
685 | values in hex. */ | |
686 | #if HOST_BITS_PER_WIDE_INT == 64 | |
687 | # define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX | |
688 | #else | |
689 | # define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx" | |
690 | #endif | |
2b374196 | 691 | |
6718899e | 692 | #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \ |
bb80c7b8 | 693 | ((CODE) == '#' || (CODE) == '|') |
823baf68 | 694 | |
6718899e | 695 | #define PRINT_OPERAND(FILE, X, CODE) \ |
696 | print_operand (FILE, X, CODE) | |
823baf68 | 697 | |
698 | /* Print a memory operand whose address is X, on file FILE. | |
699 | This uses a function in output-vax.c. */ | |
700 | ||
701 | #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \ | |
58a58d86 | 702 | print_operand_address (FILE, ADDR) |
bb80c7b8 | 703 | |
704 | /* This is a blatent lie. However, it's good enough, since we don't | |
705 | actually have any code whatsoever for which this isn't overridden | |
706 | by the proper FDE definition. */ | |
707 | #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM) | |
58a58d86 | 708 |