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8aeea6e6 | 1 | /* Definitions of target machine for GNU compiler. VAX version. |
cbe34bb5 | 2 | Copyright (C) 1987-2017 Free Software Foundation, Inc. |
ab835497 | 3 | |
e7d9d16b | 4 | This file is part of GCC. |
ab835497 | 5 | |
e7d9d16b | 6 | GCC is free software; you can redistribute it and/or modify |
ab835497 | 7 | it under the terms of the GNU General Public License as published by |
2f83c7d6 | 8 | the Free Software Foundation; either version 3, or (at your option) |
ab835497 RK |
9 | any later version. |
10 | ||
e7d9d16b | 11 | GCC is distributed in the hope that it will be useful, |
ab835497 RK |
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 | |
2f83c7d6 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
ab835497 RK |
19 | |
20 | ||
169274cd JT |
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) | |
ab835497 | 35 | |
6b857ce3 | 36 | /* Use -J option for long branch support with Unix assembler. */ |
a86d4a91 DA |
37 | |
38 | #define ASM_SPEC "-J" | |
39 | ||
ab835497 RK |
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 | ||
ab835497 RK |
50 | /* Run-time compilation parameters selecting different hardware subsets. */ |
51 | ||
c15c90bb ZW |
52 | /* Nonzero if ELF. Redefined by vax/elf.h. */ |
53 | #define TARGET_ELF 0 | |
54 | ||
1df34d4d MR |
55 | /* Use BSD names for udiv and umod libgcc calls. */ |
56 | #define TARGET_BSD_DIVMOD 1 | |
57 | ||
ab835497 RK |
58 | /* Default target_flags if no switches specified. */ |
59 | ||
60 | #ifndef TARGET_DEFAULT | |
ec01703c | 61 | #define TARGET_DEFAULT (MASK_UNIX_ASM) |
ab835497 | 62 | #endif |
3dc85dfb | 63 | |
ab835497 RK |
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. | |
8aeea6e6 | 69 | This is not true on the VAX. */ |
ab835497 RK |
70 | #define BITS_BIG_ENDIAN 0 |
71 | ||
72 | /* Define this if most significant byte of a word is the lowest numbered. */ | |
8aeea6e6 | 73 | /* That is not true on the VAX. */ |
ab835497 RK |
74 | #define BYTES_BIG_ENDIAN 0 |
75 | ||
76 | /* Define this if most significant word of a multiword number is the lowest | |
77 | numbered. */ | |
8aeea6e6 | 78 | /* This is not true on the VAX. */ |
ab835497 RK |
79 | #define WORDS_BIG_ENDIAN 0 |
80 | ||
ab835497 RK |
81 | /* Width of a word, in units (bytes). */ |
82 | #define UNITS_PER_WORD 4 | |
83 | ||
ab835497 RK |
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 | ||
43a88a8c | 96 | /* A bit-field declared as `int' forces `int' alignment for the struct. */ |
c4e75102 | 97 | #define PCC_BITFIELD_TYPE_MATTERS (! TARGET_VAXC_ALIGNMENT) |
ab835497 RK |
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 | ||
8433ffc5 | 105 | /* Set this nonzero if move instructions will actually fail to work |
ab835497 | 106 | when given unaligned data. */ |
8433ffc5 | 107 | #define STRICT_ALIGNMENT 0 |
b4ac57ab RS |
108 | |
109 | /* Let's keep the stack somewhat aligned. */ | |
110 | #define STACK_BOUNDARY 32 | |
76ce4776 R |
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 | |
ab835497 RK |
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. | |
8aeea6e6 | 127 | On the VAX, these are the AP, FP, SP and PC. */ |
ab835497 RK |
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. | |
8aeea6e6 | 142 | On the VAX, all registers are one word long. */ |
d001241c JBG |
143 | #define HARD_REGNO_NREGS(REGNO, MODE) \ |
144 | ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) | |
ab835497 | 145 | |
ab835497 RK |
146 | /* Value is 1 if it is a good idea to tie two pseudo registers |
147 | when one has mode MODE1 and one has mode MODE2. | |
f939c3e6 RS |
148 | If TARGET_HARD_REGNO_MODE_OK could produce different values for MODE1 |
149 | and MODE2, for any hard reg, then this must be 0 for correct output. */ | |
ab835497 RK |
150 | #define MODES_TIEABLE_P(MODE1, MODE2) 1 |
151 | ||
152 | /* Specify the registers used for certain standard purposes. | |
153 | The values of these macros are register numbers. */ | |
154 | ||
8aeea6e6 | 155 | /* VAX pc is overloaded on a register. */ |
0f8def68 | 156 | #define PC_REGNUM VAX_PC_REGNUM |
ab835497 RK |
157 | |
158 | /* Register to use for pushing function arguments. */ | |
0f8def68 | 159 | #define STACK_POINTER_REGNUM VAX_SP_REGNUM |
ab835497 RK |
160 | |
161 | /* Base register for access to local variables of the function. */ | |
0f8def68 | 162 | #define FRAME_POINTER_REGNUM VAX_FP_REGNUM |
ab835497 | 163 | |
c4e75102 MT |
164 | /* Offset from the frame pointer register value to the top of stack. */ |
165 | #define FRAME_POINTER_CFA_OFFSET(FNDECL) 0 | |
166 | ||
ab835497 | 167 | /* Base register for access to arguments of the function. */ |
0f8def68 | 168 | #define ARG_POINTER_REGNUM VAX_AP_REGNUM |
ab835497 RK |
169 | |
170 | /* Register in which static-chain is passed to a function. */ | |
171 | #define STATIC_CHAIN_REGNUM 0 | |
172 | ||
173 | /* Register in which address to store a structure value | |
174 | is passed to a function. */ | |
f289e226 | 175 | #define VAX_STRUCT_VALUE_REGNUM 1 |
ab835497 RK |
176 | \f |
177 | /* Define the classes of registers for register constraints in the | |
178 | machine description. Also define ranges of constants. | |
179 | ||
180 | One of the classes must always be named ALL_REGS and include all hard regs. | |
181 | If there is more than one class, another class must be named NO_REGS | |
182 | and contain no registers. | |
183 | ||
184 | The name GENERAL_REGS must be the name of a class (or an alias for | |
185 | another name such as ALL_REGS). This is the class of registers | |
186 | that is allowed by "g" or "r" in a register constraint. | |
187 | Also, registers outside this class are allocated only when | |
188 | instructions express preferences for them. | |
189 | ||
190 | The classes must be numbered in nondecreasing order; that is, | |
191 | a larger-numbered class must never be contained completely | |
192 | in a smaller-numbered class. | |
193 | ||
194 | For any two classes, it is very desirable that there be another | |
195 | class that represents their union. */ | |
d001241c | 196 | |
8aeea6e6 | 197 | /* The VAX has only one kind of registers, so NO_REGS and ALL_REGS |
ab835497 RK |
198 | are the only classes. */ |
199 | ||
200 | enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES }; | |
201 | ||
202 | #define N_REG_CLASSES (int) LIM_REG_CLASSES | |
203 | ||
204 | /* Since GENERAL_REGS is the same class as ALL_REGS, | |
205 | don't give it a different class number; just make it an alias. */ | |
206 | ||
207 | #define GENERAL_REGS ALL_REGS | |
208 | ||
6b857ce3 | 209 | /* Give names of register classes as strings for dump file. */ |
ab835497 | 210 | |
d001241c JBG |
211 | #define REG_CLASS_NAMES \ |
212 | { "NO_REGS", "ALL_REGS" } | |
ab835497 RK |
213 | |
214 | /* Define which registers fit in which classes. | |
215 | This is an initializer for a vector of HARD_REG_SET | |
216 | of length N_REG_CLASSES. */ | |
217 | ||
2fd58acb | 218 | #define REG_CLASS_CONTENTS {{0}, {0xffff}} |
ab835497 RK |
219 | |
220 | /* The same information, inverted: | |
221 | Return the class number of the smallest class containing | |
222 | reg number REGNO. This could be a conditional expression | |
223 | or could index an array. */ | |
224 | ||
c9850009 | 225 | #define REGNO_REG_CLASS(REGNO) ((void)(REGNO), ALL_REGS) |
ab835497 RK |
226 | |
227 | /* The class value for index registers, and the one for base regs. */ | |
228 | ||
229 | #define INDEX_REG_CLASS ALL_REGS | |
230 | #define BASE_REG_CLASS ALL_REGS | |
231 | ||
ab835497 RK |
232 | \f |
233 | /* Stack layout; function entry, exit and calling. */ | |
234 | ||
235 | /* Define this if pushing a word on the stack | |
236 | makes the stack pointer a smaller address. */ | |
62f9f30b | 237 | #define STACK_GROWS_DOWNWARD 1 |
ab835497 | 238 | |
a4d05547 | 239 | /* Define this to nonzero if the nominal address of the stack frame |
ab835497 RK |
240 | is at the high-address end of the local variables; |
241 | that is, each additional local variable allocated | |
242 | goes at a more negative offset in the frame. */ | |
f62c8a5c | 243 | #define FRAME_GROWS_DOWNWARD 1 |
ab835497 RK |
244 | |
245 | /* Offset within stack frame to start allocating local variables at. | |
246 | If FRAME_GROWS_DOWNWARD, this is the offset to the END of the | |
247 | first local allocated. Otherwise, it is the offset to the BEGINNING | |
248 | of the first local allocated. */ | |
249 | #define STARTING_FRAME_OFFSET 0 | |
250 | ||
5c3fd367 RS |
251 | /* Given an rtx for the address of a frame, |
252 | return an rtx for the address of the word in the frame | |
253 | that holds the dynamic chain--the previous frame's address. */ | |
0a81f074 | 254 | #define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant (Pmode, (FRAME), 12) |
5c3fd367 | 255 | |
ab835497 RK |
256 | /* If we generate an insn to push BYTES bytes, |
257 | this says how many the stack pointer really advances by. | |
8aeea6e6 | 258 | On the VAX, -(sp) pushes only the bytes of the operands. */ |
ab835497 RK |
259 | #define PUSH_ROUNDING(BYTES) (BYTES) |
260 | ||
261 | /* Offset of first parameter from the argument pointer register value. */ | |
262 | #define FIRST_PARM_OFFSET(FNDECL) 4 | |
263 | ||
ab835497 RK |
264 | /* Define how to find the value returned by a function. |
265 | VALTYPE is the data type of the value (as a tree). | |
266 | If the precise function being called is known, FUNC is its FUNCTION_DECL; | |
267 | otherwise, FUNC is 0. */ | |
268 | ||
d001241c | 269 | /* On the VAX the return value is in R0 regardless. */ |
ab835497 | 270 | |
d001241c | 271 | #define FUNCTION_VALUE(VALTYPE, FUNC) \ |
c5c76735 | 272 | gen_rtx_REG (TYPE_MODE (VALTYPE), 0) |
ab835497 RK |
273 | |
274 | /* Define how to find the value returned by a library function | |
275 | assuming the value has mode MODE. */ | |
276 | ||
d001241c | 277 | /* On the VAX the return value is in R0 regardless. */ |
ab835497 | 278 | |
c5c76735 | 279 | #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, 0) |
ab835497 RK |
280 | |
281 | /* Define this if PCC uses the nonreentrant convention for returning | |
282 | structure and union values. */ | |
283 | ||
284 | #define PCC_STATIC_STRUCT_RETURN | |
285 | ||
286 | /* 1 if N is a possible register number for a function value. | |
8aeea6e6 | 287 | On the VAX, R0 is the only register thus used. */ |
ab835497 RK |
288 | |
289 | #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0) | |
290 | ||
291 | /* 1 if N is a possible register number for function argument passing. | |
8aeea6e6 | 292 | On the VAX, no registers are used in this way. */ |
ab835497 | 293 | |
f43856db | 294 | #define FUNCTION_ARG_REGNO_P(N) ((void) (N), 0) |
ab835497 RK |
295 | \f |
296 | /* Define a data type for recording info about an argument list | |
297 | during the scan of that argument list. This data type should | |
298 | hold all necessary information about the function itself | |
299 | and about the args processed so far, enough to enable macros | |
300 | such as FUNCTION_ARG to determine where the next arg should go. | |
301 | ||
8aeea6e6 | 302 | On the VAX, this is a single integer, which is a number of bytes |
ab835497 RK |
303 | of arguments scanned so far. */ |
304 | ||
305 | #define CUMULATIVE_ARGS int | |
306 | ||
307 | /* Initialize a variable CUM of type CUMULATIVE_ARGS | |
308 | for a call to a function whose data type is FNTYPE. | |
309 | For a library call, FNTYPE is 0. | |
310 | ||
8aeea6e6 | 311 | On the VAX, the offset starts at 0. */ |
ab835497 | 312 | |
0f6937fe | 313 | #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ |
ab835497 RK |
314 | ((CUM) = 0) |
315 | ||
ab835497 RK |
316 | /* Output assembler code to FILE to increment profiler label # LABELNO |
317 | for profiling a function entry. */ | |
318 | ||
191fe2bb JT |
319 | #define VAX_FUNCTION_PROFILER_NAME "mcount" |
320 | #define FUNCTION_PROFILER(FILE, LABELNO) \ | |
321 | do \ | |
322 | { \ | |
323 | char label[256]; \ | |
324 | ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO)); \ | |
325 | fprintf (FILE, "\tmovab "); \ | |
326 | assemble_name (FILE, label); \ | |
327 | asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n", \ | |
328 | VAX_FUNCTION_PROFILER_NAME); \ | |
329 | } \ | |
330 | while (0) | |
ab835497 | 331 | |
978fc7d4 BE |
332 | /* This macro specifies a table of register pairs used to eliminate |
333 | unneeded registers that point into the stack frame. */ | |
334 | #define ELIMINABLE_REGS {{FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}} | |
335 | ||
336 | /* On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this | |
337 | macro doesn't matter for register eliminations, but it should still | |
338 | give realistic data for rtx_addr_can_trap_p. */ | |
339 | #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ | |
340 | ((OFFSET) = get_frame_size ()) | |
341 | ||
ab835497 RK |
342 | /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function, |
343 | the stack pointer does not matter. The value is tested only in | |
344 | functions that have frame pointers. | |
345 | No definition is equivalent to always zero. */ | |
346 | ||
347 | #define EXIT_IGNORE_STACK 1 | |
348 | ||
ab835497 RK |
349 | /* Length in units of the trampoline for entering a nested function. */ |
350 | ||
351 | #define TRAMPOLINE_SIZE 15 | |
352 | ||
4f069e14 RK |
353 | /* Byte offset of return address in a stack frame. The "saved PC" field |
354 | is in element [4] when treating the frame as an array of longwords. */ | |
355 | ||
356 | #define RETURN_ADDRESS_OFFSET (4 * UNITS_PER_WORD) /* 16 */ | |
357 | ||
358 | /* A C expression whose value is RTL representing the value of the return | |
359 | address for the frame COUNT steps up from the current frame. | |
360 | FRAMEADDR is already the frame pointer of the COUNT frame, so we | |
361 | can ignore COUNT. */ | |
362 | ||
d001241c JBG |
363 | #define RETURN_ADDR_RTX(COUNT, FRAME) \ |
364 | ((COUNT == 0) \ | |
0a81f074 RS |
365 | ? gen_rtx_MEM (Pmode, plus_constant (Pmode, FRAME, \ |
366 | RETURN_ADDRESS_OFFSET)) \ | |
9704efe6 | 367 | : (rtx) 0) |
4f069e14 | 368 | |
ab835497 RK |
369 | \f |
370 | /* Addressing modes, and classification of registers for them. */ | |
371 | ||
940da324 | 372 | #define HAVE_POST_INCREMENT 1 |
ab835497 | 373 | |
940da324 | 374 | #define HAVE_PRE_DECREMENT 1 |
ab835497 RK |
375 | |
376 | /* Macros to check register numbers against specific register classes. */ | |
377 | ||
378 | /* These assume that REGNO is a hard or pseudo reg number. | |
379 | They give nonzero only if REGNO is a hard reg of the suitable class | |
380 | or a pseudo reg currently allocated to a suitable hard reg. | |
381 | Since they use reg_renumber, they are safe only once reg_renumber | |
aeb9f7cf SB |
382 | has been allocated, which happens in reginfo.c during register |
383 | allocation. */ | |
ab835497 | 384 | |
d001241c JBG |
385 | #define REGNO_OK_FOR_INDEX_P(regno) \ |
386 | ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) | |
387 | #define REGNO_OK_FOR_BASE_P(regno) \ | |
388 | ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0) | |
ab835497 RK |
389 | \f |
390 | /* Maximum number of registers that can appear in a valid memory address. */ | |
391 | ||
392 | #define MAX_REGS_PER_ADDRESS 2 | |
393 | ||
394 | /* 1 if X is an rtx for a constant that is a valid address. */ | |
395 | ||
fbf55580 | 396 | #define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X) |
ab835497 | 397 | |
ab835497 RK |
398 | /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx |
399 | and check its validity for a certain class. | |
400 | We have two alternate definitions for each of them. | |
401 | The usual definition accepts all pseudo regs; the other rejects | |
402 | them unless they have been allocated suitable hard regs. | |
403 | The symbol REG_OK_STRICT causes the latter definition to be used. | |
404 | ||
405 | Most source files want to accept pseudo regs in the hope that | |
406 | they will get allocated to the class that the insn wants them to be in. | |
407 | Source files for reload pass need to be strict. | |
408 | After reload, it makes no difference, since pseudo regs have | |
409 | been eliminated by then. */ | |
410 | ||
411 | #ifndef REG_OK_STRICT | |
412 | ||
413 | /* Nonzero if X is a hard reg that can be used as an index | |
414 | or if it is a pseudo reg. */ | |
415 | #define REG_OK_FOR_INDEX_P(X) 1 | |
fbf55580 | 416 | |
ab835497 RK |
417 | /* Nonzero if X is a hard reg that can be used as a base reg |
418 | or if it is a pseudo reg. */ | |
419 | #define REG_OK_FOR_BASE_P(X) 1 | |
420 | ||
421 | #else | |
422 | ||
423 | /* Nonzero if X is a hard reg that can be used as an index. */ | |
424 | #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X)) | |
fbf55580 | 425 | |
ab835497 RK |
426 | /* Nonzero if X is a hard reg that can be used as a base reg. */ |
427 | #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X)) | |
428 | ||
fbf55580 | 429 | #endif |
ab835497 RK |
430 | \f |
431 | /* Specify the machine mode that this machine uses | |
432 | for the index in the tablejump instruction. */ | |
433 | #define CASE_VECTOR_MODE HImode | |
434 | ||
18543a22 ILT |
435 | /* Define as C expression which evaluates to nonzero if the tablejump |
436 | instruction expects the table to contain offsets from the address of the | |
437 | table. | |
6b857ce3 | 438 | Do not define this if the table should contain absolute addresses. */ |
18543a22 | 439 | #define CASE_VECTOR_PC_RELATIVE 1 |
ab835497 | 440 | |
b6aa31c5 JT |
441 | /* Indicate that jump tables go in the text section. This is |
442 | necessary when compiling PIC code. */ | |
443 | #define JUMP_TABLES_IN_TEXT_SECTION 1 | |
444 | ||
ab835497 RK |
445 | /* Define this as 1 if `char' should by default be signed; else as 0. */ |
446 | #define DEFAULT_SIGNED_CHAR 1 | |
447 | ||
ab835497 RK |
448 | /* Max number of bytes we can move from memory to memory |
449 | in one reasonably fast instruction. */ | |
450 | #define MOVE_MAX 8 | |
451 | ||
c4e75102 MT |
452 | /* If a memory-to-memory move would take MOVE_RATIO or more simple |
453 | move-instruction pairs, we will do a movmem or libcall instead. */ | |
454 | #define MOVE_RATIO(speed) ((speed) ? 6 : 3) | |
455 | #define CLEAR_RATIO(speed) ((speed) ? 6 : 2) | |
456 | ||
ab835497 RK |
457 | /* Nonzero if access to memory by bytes is slow and undesirable. */ |
458 | #define SLOW_BYTE_ACCESS 0 | |
459 | ||
460 | /* Define if shifts truncate the shift count | |
461 | which implies one can omit a sign-extension or zero-extension | |
462 | of a shift count. */ | |
463 | /* #define SHIFT_COUNT_TRUNCATED */ | |
464 | ||
465 | /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits | |
466 | is done just by pretending it is already truncated. */ | |
467 | #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 | |
468 | ||
469 | /* Specify the machine mode that pointers have. | |
470 | After generation of rtl, the compiler makes no further distinction | |
471 | between pointers and any other objects of this machine mode. */ | |
472 | #define Pmode SImode | |
473 | ||
474 | /* A function address in a call instruction | |
475 | is a byte address (for indexing purposes) | |
476 | so give the MEM rtx a byte's mode. */ | |
477 | #define FUNCTION_MODE QImode | |
478 | ||
ab835497 RK |
479 | /* Specify the cost of a branch insn; roughly the number of extra insns that |
480 | should be added to avoid a branch. | |
481 | ||
482 | Branches are extremely cheap on the VAX while the shift insns often | |
483 | used to replace branches can be expensive. */ | |
484 | ||
3a4fd356 | 485 | #define BRANCH_COST(speed_p, predictable_p) 0 |
ab835497 RK |
486 | \f |
487 | /* Tell final.c how to eliminate redundant test instructions. */ | |
488 | ||
489 | /* Here we define machine-dependent flags and fields in cc_status | |
8aeea6e6 | 490 | (see `conditions.h'). No extra ones are needed for the VAX. */ |
ab835497 RK |
491 | |
492 | /* Store in cc_status the expressions | |
493 | that the condition codes will describe | |
494 | after execution of an instruction whose pattern is EXP. | |
495 | Do not alter them if the instruction would not alter the cc's. */ | |
496 | ||
d001241c | 497 | #define NOTICE_UPDATE_CC(EXP, INSN) \ |
af0ec113 | 498 | vax_notice_update_cc ((EXP), (INSN)) |
ab835497 | 499 | |
d001241c JBG |
500 | #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \ |
501 | { if (cc_status.flags & CC_NO_OVERFLOW) \ | |
502 | return NO_OV; \ | |
503 | return NORMAL; \ | |
504 | } | |
ab835497 RK |
505 | \f |
506 | /* Control the assembler format that we output. */ | |
507 | ||
72f03fde JDA |
508 | /* A C string constant describing how to begin a comment in the target |
509 | assembler language. The compiler assumes that the comment will end at | |
510 | the end of the line. */ | |
511 | ||
512 | #define ASM_COMMENT_START "#" | |
513 | ||
ab835497 RK |
514 | /* Output to assembler file text saying following lines |
515 | may contain character constants, extra white space, comments, etc. */ | |
516 | ||
517 | #define ASM_APP_ON "#APP\n" | |
518 | ||
519 | /* Output to assembler file text saying following lines | |
520 | no longer contain unusual constructs. */ | |
521 | ||
522 | #define ASM_APP_OFF "#NO_APP\n" | |
523 | ||
524 | /* Output before read-only data. */ | |
525 | ||
471b6f1b | 526 | #define TEXT_SECTION_ASM_OP "\t.text" |
ab835497 RK |
527 | |
528 | /* Output before writable data. */ | |
529 | ||
471b6f1b | 530 | #define DATA_SECTION_ASM_OP "\t.data" |
ab835497 RK |
531 | |
532 | /* How to refer to registers in assembler output. | |
23361093 MT |
533 | This sequence is indexed by compiler's hard-register-number (see above). |
534 | The register names will be prefixed by REGISTER_PREFIX, if any. */ | |
ab835497 | 535 | |
23361093 | 536 | #define REGISTER_PREFIX "" |
d001241c JBG |
537 | #define REGISTER_NAMES \ |
538 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
539 | "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", } | |
ab835497 RK |
540 | |
541 | /* This is BSD, so it wants DBX format. */ | |
542 | ||
23532de9 | 543 | #define DBX_DEBUGGING_INFO 1 |
ab835497 | 544 | |
ab835497 RK |
545 | /* Do not break .stabs pseudos into continuations. */ |
546 | ||
547 | #define DBX_CONTIN_LENGTH 0 | |
548 | ||
549 | /* This is the char to use for continuation (in case we need to turn | |
550 | continuation back on). */ | |
551 | ||
552 | #define DBX_CONTIN_CHAR '?' | |
553 | ||
554 | /* Don't use the `xsfoo;' construct in DBX output; this system | |
555 | doesn't support it. */ | |
556 | ||
557 | #define DBX_NO_XREFS | |
558 | ||
559 | /* Output the .stabs for a C `static' variable in the data section. */ | |
560 | #define DBX_STATIC_STAB_DATA_SECTION | |
561 | ||
8aeea6e6 | 562 | /* VAX specific: which type character is used for type double? */ |
ab835497 RK |
563 | |
564 | #define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd') | |
565 | ||
ab835497 RK |
566 | /* This is how to output a command to make the user-level label named NAME |
567 | defined for reference from other files. */ | |
568 | ||
506a61b1 KG |
569 | /* Globalizing directive for a label. */ |
570 | #define GLOBAL_ASM_OP ".globl " | |
ab835497 | 571 | |
6b857ce3 | 572 | /* The prefix to add to user-visible assembler symbols. */ |
ab835497 | 573 | |
4e0c8ad2 | 574 | #define USER_LABEL_PREFIX "_" |
ab835497 | 575 | |
ab835497 RK |
576 | /* This is how to store into the string LABEL |
577 | the symbol_ref name of an internal numbered label where | |
578 | PREFIX is the class of label and NUM is the number within the class. | |
579 | This is suitable for output with `assemble_name'. */ | |
580 | ||
581 | #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ | |
ace49484 | 582 | sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM)) |
ab835497 | 583 | |
ab835497 RK |
584 | /* This is how to output an insn to push a register on the stack. |
585 | It need not be very fast code. */ | |
586 | ||
587 | #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \ | |
588 | fprintf (FILE, "\tpushl %s\n", reg_names[REGNO]) | |
589 | ||
590 | /* This is how to output an insn to pop a register from the stack. | |
591 | It need not be very fast code. */ | |
592 | ||
d001241c JBG |
593 | #define ASM_OUTPUT_REG_POP(FILE,REGNO) \ |
594 | fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM], \ | |
b6aa31c5 | 595 | reg_names[REGNO]) |
ab835497 RK |
596 | |
597 | /* This is how to output an element of a case-vector that is absolute. | |
8aeea6e6 | 598 | (The VAX does not use such vectors, |
ab835497 RK |
599 | but we must define this macro anyway.) */ |
600 | ||
b6aa31c5 JT |
601 | #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ |
602 | do \ | |
603 | { \ | |
604 | char label[256]; \ | |
605 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\ | |
606 | fprintf (FILE, "\t.long "); \ | |
607 | assemble_name (FILE, label); \ | |
608 | fprintf (FILE, "\n"); \ | |
609 | } \ | |
610 | while (0) | |
ab835497 RK |
611 | |
612 | /* This is how to output an element of a case-vector that is relative. */ | |
613 | ||
b6aa31c5 JT |
614 | #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ |
615 | do \ | |
616 | { \ | |
617 | char label[256]; \ | |
618 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE)); \ | |
619 | fprintf (FILE, "\t.word "); \ | |
620 | assemble_name (FILE, label); \ | |
621 | ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL)); \ | |
622 | fprintf (FILE, "-"); \ | |
623 | assemble_name (FILE, label); \ | |
624 | fprintf (FILE, "\n"); \ | |
625 | } \ | |
626 | while (0) | |
ab835497 RK |
627 | |
628 | /* This is how to output an assembler line | |
629 | that says to advance the location counter | |
630 | to a multiple of 2**LOG bytes. */ | |
631 | ||
632 | #define ASM_OUTPUT_ALIGN(FILE,LOG) \ | |
633 | fprintf (FILE, "\t.align %d\n", (LOG)) | |
634 | ||
635 | /* This is how to output an assembler line | |
636 | that says to advance the location counter by SIZE bytes. */ | |
637 | ||
638 | #define ASM_OUTPUT_SKIP(FILE,SIZE) \ | |
58e15542 | 639 | fprintf (FILE, "\t.space %u\n", (int)(SIZE)) |
ab835497 RK |
640 | |
641 | /* This says how to output an assembler line | |
642 | to define a global common symbol. */ | |
643 | ||
d001241c JBG |
644 | #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ |
645 | ( fputs (".comm ", (FILE)), \ | |
646 | assemble_name ((FILE), (NAME)), \ | |
647 | fprintf ((FILE), ",%u\n", (int)(ROUNDED))) | |
ab835497 RK |
648 | |
649 | /* This says how to output an assembler line | |
650 | to define a local common symbol. */ | |
651 | ||
d001241c JBG |
652 | #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ |
653 | ( fputs (".lcomm ", (FILE)), \ | |
654 | assemble_name ((FILE), (NAME)), \ | |
655 | fprintf ((FILE), ",%u\n", (int)(ROUNDED))) | |
ab835497 | 656 | |
ab835497 RK |
657 | /* Print an instruction operand X on file FILE. |
658 | CODE is the code from the %-spec that requested printing this operand; | |
659 | if `%z3' was used to print operand 3, then CODE is 'z'. | |
985b3bdd RS |
660 | |
661 | VAX operand formatting codes: | |
662 | ||
663 | letter print | |
f90b7a5a | 664 | c direct branch condition |
985b3bdd | 665 | C reverse branch condition |
61fcaf9e | 666 | D 64-bit immediate operand |
985b3bdd RS |
667 | B the low 8 bits of the complement of a constant operand |
668 | H the low 16 bits of the complement of a constant operand | |
bb5794b9 | 669 | M a mask for the N highest bits of a word |
985b3bdd RS |
670 | N the complement of a constant integer operand |
671 | P constant operand plus 1 | |
672 | R 32 - constant operand | |
673 | b the low 8 bits of a negated constant operand | |
674 | h the low 16 bits of a negated constant operand | |
191fe2bb JT |
675 | # 'd' or 'g' depending on whether dfloat or gfloat is used |
676 | | register prefix */ | |
ab835497 | 677 | |
8aeea6e6 | 678 | /* The purpose of D is to get around a quirk or bug in VAX assembler |
61fcaf9e | 679 | whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff, |
72f03fde JDA |
680 | which is not a 64-bit minus one. As a workaround, we output negative |
681 | values in hex. */ | |
682 | #if HOST_BITS_PER_WIDE_INT == 64 | |
683 | # define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX | |
684 | #else | |
685 | # define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx" | |
686 | #endif | |
61fcaf9e | 687 | |
c4e75102 | 688 | #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \ |
b6aa31c5 | 689 | ((CODE) == '#' || (CODE) == '|') |
ab835497 | 690 | |
c4e75102 MT |
691 | #define PRINT_OPERAND(FILE, X, CODE) \ |
692 | print_operand (FILE, X, CODE) | |
ab835497 RK |
693 | |
694 | /* Print a memory operand whose address is X, on file FILE. | |
695 | This uses a function in output-vax.c. */ | |
696 | ||
697 | #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \ | |
d001241c | 698 | print_operand_address (FILE, ADDR) |
b6aa31c5 JT |
699 | |
700 | /* This is a blatent lie. However, it's good enough, since we don't | |
701 | actually have any code whatsoever for which this isn't overridden | |
702 | by the proper FDE definition. */ | |
703 | #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM) | |
d001241c | 704 |