1 /* Definitions of target machine for GNU compiler, for DEC Alpha.
2 Copyright (C) 1992-2017 Free Software Foundation, Inc.
3 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* Target CPU builtins. */
22 #define TARGET_CPU_CPP_BUILTINS() \
25 builtin_define ("__alpha"); \
26 builtin_define ("__alpha__"); \
27 builtin_assert ("cpu=alpha"); \
28 builtin_assert ("machine=alpha"); \
31 builtin_define ("__alpha_cix__"); \
32 builtin_assert ("cpu=cix"); \
36 builtin_define ("__alpha_fix__"); \
37 builtin_assert ("cpu=fix"); \
41 builtin_define ("__alpha_bwx__"); \
42 builtin_assert ("cpu=bwx"); \
46 builtin_define ("__alpha_max__"); \
47 builtin_assert ("cpu=max"); \
49 if (alpha_cpu == PROCESSOR_EV6) \
51 builtin_define ("__alpha_ev6__"); \
52 builtin_assert ("cpu=ev6"); \
54 else if (alpha_cpu == PROCESSOR_EV5) \
56 builtin_define ("__alpha_ev5__"); \
57 builtin_assert ("cpu=ev5"); \
59 else /* Presumably ev4. */ \
61 builtin_define ("__alpha_ev4__"); \
62 builtin_assert ("cpu=ev4"); \
64 if (TARGET_IEEE || TARGET_IEEE_WITH_INEXACT) \
65 builtin_define ("_IEEE_FP"); \
66 if (TARGET_IEEE_WITH_INEXACT) \
67 builtin_define ("_IEEE_FP_INEXACT"); \
68 if (TARGET_LONG_DOUBLE_128) \
69 builtin_define ("__LONG_DOUBLE_128__"); \
71 /* Macros dependent on the C dialect. */ \
72 SUBTARGET_LANGUAGE_CPP_BUILTINS(); \
75 #ifndef SUBTARGET_LANGUAGE_CPP_BUILTINS
76 #define SUBTARGET_LANGUAGE_CPP_BUILTINS() \
79 if (preprocessing_asm_p ()) \
80 builtin_define_std ("LANGUAGE_ASSEMBLY"); \
81 else if (c_dialect_cxx ()) \
83 builtin_define ("__LANGUAGE_C_PLUS_PLUS"); \
84 builtin_define ("__LANGUAGE_C_PLUS_PLUS__"); \
87 builtin_define_std ("LANGUAGE_C"); \
88 if (c_dialect_objc ()) \
90 builtin_define ("__LANGUAGE_OBJECTIVE_C"); \
91 builtin_define ("__LANGUAGE_OBJECTIVE_C__"); \
97 /* Run-time compilation parameters selecting different hardware subsets. */
99 /* Which processor to schedule for. The cpu attribute defines a list that
100 mirrors this list, so changes to alpha.md must be made at the same time. */
104 PROCESSOR_EV4
, /* 2106[46]{a,} */
105 PROCESSOR_EV5
, /* 21164{a,pc,} */
106 PROCESSOR_EV6
, /* 21264 */
110 extern enum processor_type alpha_cpu
;
111 extern enum processor_type alpha_tune
;
113 enum alpha_trap_precision
115 ALPHA_TP_PROG
, /* No precision (default). */
116 ALPHA_TP_FUNC
, /* Trap contained within originating function. */
117 ALPHA_TP_INSN
/* Instruction accuracy and code is resumption safe. */
120 enum alpha_fp_rounding_mode
122 ALPHA_FPRM_NORM
, /* Normal rounding mode. */
123 ALPHA_FPRM_MINF
, /* Round towards minus-infinity. */
124 ALPHA_FPRM_CHOP
, /* Chopped rounding mode (towards 0). */
125 ALPHA_FPRM_DYN
/* Dynamic rounding mode. */
128 enum alpha_fp_trap_mode
130 ALPHA_FPTM_N
, /* Normal trap mode. */
131 ALPHA_FPTM_U
, /* Underflow traps enabled. */
132 ALPHA_FPTM_SU
, /* Software completion, w/underflow traps */
133 ALPHA_FPTM_SUI
/* Software completion, w/underflow & inexact traps */
136 extern enum alpha_trap_precision alpha_tp
;
137 extern enum alpha_fp_rounding_mode alpha_fprm
;
138 extern enum alpha_fp_trap_mode alpha_fptm
;
140 /* Invert the easy way to make options work. */
141 #define TARGET_FP (!TARGET_SOFT_FP)
143 /* These are for target os support and cannot be changed at runtime. */
144 #define TARGET_ABI_OPEN_VMS 0
145 #define TARGET_ABI_OSF (!TARGET_ABI_OPEN_VMS)
147 #ifndef TARGET_CAN_FAULT_IN_PROLOGUE
148 #define TARGET_CAN_FAULT_IN_PROLOGUE 0
150 #ifndef TARGET_HAS_XFLOATING_LIBS
151 #define TARGET_HAS_XFLOATING_LIBS TARGET_LONG_DOUBLE_128
153 #ifndef TARGET_PROFILING_NEEDS_GP
154 #define TARGET_PROFILING_NEEDS_GP 0
156 #ifndef TARGET_FIXUP_EV5_PREFETCH
157 #define TARGET_FIXUP_EV5_PREFETCH 0
160 #define HAVE_AS_TLS 0
163 #define TARGET_DEFAULT MASK_FPREGS
165 #ifndef TARGET_CPU_DEFAULT
166 #define TARGET_CPU_DEFAULT 0
169 #ifndef TARGET_DEFAULT_EXPLICIT_RELOCS
170 #ifdef HAVE_AS_EXPLICIT_RELOCS
171 #define TARGET_DEFAULT_EXPLICIT_RELOCS MASK_EXPLICIT_RELOCS
172 #define TARGET_SUPPORT_ARCH 1
174 #define TARGET_DEFAULT_EXPLICIT_RELOCS 0
178 #ifndef TARGET_SUPPORT_ARCH
179 #define TARGET_SUPPORT_ARCH 0
182 /* Support for a compile-time default CPU, et cetera. The rules are:
183 --with-cpu is ignored if -mcpu is specified.
184 --with-tune is ignored if -mtune is specified. */
185 #define OPTION_DEFAULT_SPECS \
186 {"cpu", "%{!mcpu=*:-mcpu=%(VALUE)}" }, \
187 {"tune", "%{!mtune=*:-mtune=%(VALUE)}" }
190 /* target machine storage layout */
192 /* Define the size of `int'. The default is the same as the word size. */
193 #define INT_TYPE_SIZE 32
195 /* Define the size of `long long'. The default is the twice the word size. */
196 #define LONG_LONG_TYPE_SIZE 64
198 /* The two floating-point formats we support are S-floating, which is
199 4 bytes, and T-floating, which is 8 bytes. `float' is S and `double'
200 and `long double' are T. */
202 #define FLOAT_TYPE_SIZE 32
203 #define DOUBLE_TYPE_SIZE 64
204 #define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)
206 /* Work around target_flags dependency in ada/targtyps.c. */
207 #define WIDEST_HARDWARE_FP_SIZE 64
209 #define WCHAR_TYPE "unsigned int"
210 #define WCHAR_TYPE_SIZE 32
212 /* Define this macro if it is advisable to hold scalars in registers
213 in a wider mode than that declared by the program. In such cases,
214 the value is constrained to be within the bounds of the declared
215 type, but kept valid in the wider mode. The signedness of the
216 extension may differ from that of the type.
218 For Alpha, we always store objects in a full register. 32-bit integers
219 are always sign-extended, but smaller objects retain their signedness.
221 Note that small vector types can get mapped onto integer modes at the
222 whim of not appearing in alpha-modes.def. We never promoted these
223 values before; don't do so now that we've trimmed the set of modes to
224 those actually implemented in the backend. */
226 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE) \
227 if (GET_MODE_CLASS (MODE) == MODE_INT \
228 && (TYPE == NULL || TREE_CODE (TYPE) != VECTOR_TYPE) \
229 && GET_MODE_SIZE (MODE) < UNITS_PER_WORD) \
231 if ((MODE) == SImode) \
236 /* Define this if most significant bit is lowest numbered
237 in instructions that operate on numbered bit-fields.
239 There are no such instructions on the Alpha, but the documentation
241 #define BITS_BIG_ENDIAN 0
243 /* Define this if most significant byte of a word is the lowest numbered.
244 This is false on the Alpha. */
245 #define BYTES_BIG_ENDIAN 0
247 /* Define this if most significant word of a multiword number is lowest
250 For Alpha we can decide arbitrarily since there are no machine instructions
251 for them. Might as well be consistent with bytes. */
252 #define WORDS_BIG_ENDIAN 0
254 /* Width of a word, in units (bytes). */
255 #define UNITS_PER_WORD 8
257 /* Width in bits of a pointer.
258 See also the macro `Pmode' defined below. */
259 #define POINTER_SIZE 64
261 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
262 #define PARM_BOUNDARY 64
264 /* Boundary (in *bits*) on which stack pointer should be aligned. */
265 #define STACK_BOUNDARY 128
267 /* Allocation boundary (in *bits*) for the code of a function. */
268 #define FUNCTION_BOUNDARY 32
270 /* Alignment of field after `int : 0' in a structure. */
271 #define EMPTY_FIELD_BOUNDARY 64
273 /* Every structure's size must be a multiple of this. */
274 #define STRUCTURE_SIZE_BOUNDARY 8
276 /* A bit-field declared as `int' forces `int' alignment for the struct. */
277 #undef PCC_BITFILED_TYPE_MATTERS
278 #define PCC_BITFIELD_TYPE_MATTERS 1
280 /* No data type wants to be aligned rounder than this. */
281 #define BIGGEST_ALIGNMENT 128
283 /* For atomic access to objects, must have at least 32-bit alignment
284 unless the machine has byte operations. */
285 #define MINIMUM_ATOMIC_ALIGNMENT ((unsigned int) (TARGET_BWX ? 8 : 32))
287 /* Align all constants and variables to at least a word boundary so
288 we can pick up pieces of them faster. */
289 /* ??? Only if block-move stuff knows about different source/destination
292 #define CONSTANT_ALIGNMENT(EXP, ALIGN) MAX ((ALIGN), BITS_PER_WORD)
293 #define DATA_ALIGNMENT(EXP, ALIGN) MAX ((ALIGN), BITS_PER_WORD)
296 /* Set this nonzero if move instructions will actually fail to work
297 when given unaligned data.
299 Since we get an error message when we do one, call them invalid. */
301 #define STRICT_ALIGNMENT 1
303 /* Standard register usage. */
305 /* Number of actual hardware registers.
306 The hardware registers are assigned numbers for the compiler
307 from 0 to just below FIRST_PSEUDO_REGISTER.
308 All registers that the compiler knows about must be given numbers,
309 even those that are not normally considered general registers.
311 We define all 32 integer registers, even though $31 is always zero,
312 and all 32 floating-point registers, even though $f31 is also
313 always zero. We do not bother defining the FP status register and
314 there are no other registers.
316 Since $31 is always zero, we will use register number 31 as the
317 argument pointer. It will never appear in the generated code
318 because we will always be eliminating it in favor of the stack
319 pointer or hardware frame pointer.
321 Likewise, we use $f31 for the frame pointer, which will always
322 be eliminated in favor of the hardware frame pointer or the
325 #define FIRST_PSEUDO_REGISTER 64
327 /* 1 for registers that have pervasive standard uses
328 and are not available for the register allocator. */
330 #define FIXED_REGISTERS \
331 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
332 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, \
333 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
334 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
336 /* 1 for registers not available across function calls.
337 These must include the FIXED_REGISTERS and also any
338 registers that can be used without being saved.
339 The latter must include the registers where values are returned
340 and the register where structure-value addresses are passed.
341 Aside from that, you can include as many other registers as you like. */
342 #define CALL_USED_REGISTERS \
343 {1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, \
344 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, \
345 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
346 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
348 /* List the order in which to allocate registers. Each register must be
349 listed once, even those in FIXED_REGISTERS. */
351 #define REG_ALLOC_ORDER { \
352 1, 2, 3, 4, 5, 6, 7, 8, /* nonsaved integer registers */ \
353 22, 23, 24, 25, 28, /* likewise */ \
354 0, /* likewise, but return value */ \
355 21, 20, 19, 18, 17, 16, /* likewise, but input args */ \
356 27, /* likewise, but OSF procedure value */ \
358 42, 43, 44, 45, 46, 47, /* nonsaved floating-point registers */ \
359 54, 55, 56, 57, 58, 59, /* likewise */ \
360 60, 61, 62, /* likewise */ \
361 32, 33, /* likewise, but return values */ \
362 53, 52, 51, 50, 49, 48, /* likewise, but input args */ \
364 9, 10, 11, 12, 13, 14, /* saved integer registers */ \
365 26, /* return address */ \
366 15, /* hard frame pointer */ \
368 34, 35, 36, 37, 38, 39, /* saved floating-point registers */ \
369 40, 41, /* likewise */ \
371 29, 30, 31, 63 /* gp, sp, ap, sfp */ \
374 /* Specify the registers used for certain standard purposes.
375 The values of these macros are register numbers. */
377 /* Alpha pc isn't overloaded on a register that the compiler knows about. */
378 /* #define PC_REGNUM */
380 /* Register to use for pushing function arguments. */
381 #define STACK_POINTER_REGNUM 30
383 /* Base register for access to local variables of the function. */
384 #define HARD_FRAME_POINTER_REGNUM 15
386 /* Base register for access to arguments of the function. */
387 #define ARG_POINTER_REGNUM 31
389 /* Base register for access to local variables of function. */
390 #define FRAME_POINTER_REGNUM 63
392 /* Register in which static-chain is passed to a function.
394 For the Alpha, this is based on an example; the calling sequence
395 doesn't seem to specify this. */
396 #define STATIC_CHAIN_REGNUM 1
398 /* The register number of the register used to address a table of
399 static data addresses in memory. */
400 #define PIC_OFFSET_TABLE_REGNUM 29
402 /* Define this macro if the register defined by `PIC_OFFSET_TABLE_REGNUM'
403 is clobbered by calls. */
404 /* ??? It is and it isn't. It's required to be valid for a given
405 function when the function returns. It isn't clobbered by
406 current_file functions. Moreover, we do not expose the ldgp
407 until after reload, so we're probably safe. */
408 /* #define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED */
410 /* Define the classes of registers for register constraints in the
411 machine description. Also define ranges of constants.
413 One of the classes must always be named ALL_REGS and include all hard regs.
414 If there is more than one class, another class must be named NO_REGS
415 and contain no registers.
417 The name GENERAL_REGS must be the name of a class (or an alias for
418 another name such as ALL_REGS). This is the class of registers
419 that is allowed by "g" or "r" in a register constraint.
420 Also, registers outside this class are allocated only when
421 instructions express preferences for them.
423 The classes must be numbered in nondecreasing order; that is,
424 a larger-numbered class must never be contained completely
425 in a smaller-numbered class.
427 For any two classes, it is very desirable that there be another
428 class that represents their union. */
431 NO_REGS
, R0_REG
, R24_REG
, R25_REG
, R27_REG
,
432 GENERAL_REGS
, FLOAT_REGS
, ALL_REGS
,
436 #define N_REG_CLASSES (int) LIM_REG_CLASSES
438 /* Give names of register classes as strings for dump file. */
440 #define REG_CLASS_NAMES \
441 {"NO_REGS", "R0_REG", "R24_REG", "R25_REG", "R27_REG", \
442 "GENERAL_REGS", "FLOAT_REGS", "ALL_REGS" }
444 /* Define which registers fit in which classes.
445 This is an initializer for a vector of HARD_REG_SET
446 of length N_REG_CLASSES. */
448 #define REG_CLASS_CONTENTS \
449 { {0x00000000, 0x00000000}, /* NO_REGS */ \
450 {0x00000001, 0x00000000}, /* R0_REG */ \
451 {0x01000000, 0x00000000}, /* R24_REG */ \
452 {0x02000000, 0x00000000}, /* R25_REG */ \
453 {0x08000000, 0x00000000}, /* R27_REG */ \
454 {0xffffffff, 0x80000000}, /* GENERAL_REGS */ \
455 {0x00000000, 0x7fffffff}, /* FLOAT_REGS */ \
456 {0xffffffff, 0xffffffff} }
458 /* The same information, inverted:
459 Return the class number of the smallest class containing
460 reg number REGNO. This could be a conditional expression
461 or could index an array. */
463 #define REGNO_REG_CLASS(REGNO) \
464 ((REGNO) == 0 ? R0_REG \
465 : (REGNO) == 24 ? R24_REG \
466 : (REGNO) == 25 ? R25_REG \
467 : (REGNO) == 27 ? R27_REG \
468 : IN_RANGE ((REGNO), 32, 62) ? FLOAT_REGS \
471 /* The class value for index registers, and the one for base regs. */
472 #define INDEX_REG_CLASS NO_REGS
473 #define BASE_REG_CLASS GENERAL_REGS
475 /* Given an rtx X being reloaded into a reg required to be
476 in class CLASS, return the class of reg to actually use.
477 In general this is just CLASS; but on some machines
478 in some cases it is preferable to use a more restrictive class. */
480 #define PREFERRED_RELOAD_CLASS alpha_preferred_reload_class
482 /* Provide the cost of a branch. Exact meaning under development. */
483 #define BRANCH_COST(speed_p, predictable_p) 5
485 /* Stack layout; function entry, exit and calling. */
487 /* Define this if pushing a word on the stack
488 makes the stack pointer a smaller address. */
489 #define STACK_GROWS_DOWNWARD 1
491 /* Define this to nonzero if the nominal address of the stack frame
492 is at the high-address end of the local variables;
493 that is, each additional local variable allocated
494 goes at a more negative offset in the frame. */
495 /* #define FRAME_GROWS_DOWNWARD 0 */
497 /* Offset within stack frame to start allocating local variables at.
498 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
499 first local allocated. Otherwise, it is the offset to the BEGINNING
500 of the first local allocated. */
502 #define STARTING_FRAME_OFFSET 0
504 /* If we generate an insn to push BYTES bytes,
505 this says how many the stack pointer really advances by.
506 On Alpha, don't define this because there are no push insns. */
507 /* #define PUSH_ROUNDING(BYTES) */
509 /* Define this to be nonzero if stack checking is built into the ABI. */
510 #define STACK_CHECK_BUILTIN 1
512 /* Define this if the maximum size of all the outgoing args is to be
513 accumulated and pushed during the prologue. The amount can be
514 found in the variable crtl->outgoing_args_size. */
515 #define ACCUMULATE_OUTGOING_ARGS 1
517 /* Offset of first parameter from the argument pointer register value. */
519 #define FIRST_PARM_OFFSET(FNDECL) 0
521 /* Definitions for register eliminations.
523 We have two registers that can be eliminated on the Alpha. First, the
524 frame pointer register can often be eliminated in favor of the stack
525 pointer register. Secondly, the argument pointer register can always be
526 eliminated; it is replaced with either the stack or frame pointer. */
528 /* This is an array of structures. Each structure initializes one pair
529 of eliminable registers. The "from" register number is given first,
530 followed by "to". Eliminations of the same "from" register are listed
531 in order of preference. */
533 #define ELIMINABLE_REGS \
534 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
535 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
536 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
537 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
539 /* Round up to a multiple of 16 bytes. */
540 #define ALPHA_ROUND(X) ROUND_UP ((X), 16)
542 /* Define the offset between two registers, one to be eliminated, and the other
543 its replacement, at the start of a routine. */
544 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
545 ((OFFSET) = alpha_initial_elimination_offset(FROM, TO))
547 /* Define this if stack space is still allocated for a parameter passed
549 /* #define REG_PARM_STACK_SPACE */
551 /* 1 if N is a possible register number for function argument passing.
552 On Alpha, these are $16-$21 and $f16-$f21. */
554 #define FUNCTION_ARG_REGNO_P(N) \
555 (IN_RANGE ((N), 16, 21) || ((N) >= 16 + 32 && (N) <= 21 + 32))
557 /* Define a data type for recording info about an argument list
558 during the scan of that argument list. This data type should
559 hold all necessary information about the function itself
560 and about the args processed so far, enough to enable macros
561 such as FUNCTION_ARG to determine where the next arg should go.
563 On Alpha, this is a single integer, which is a number of words
564 of arguments scanned so far.
565 Thus 6 or more means all following args should go on the stack. */
567 #define CUMULATIVE_ARGS int
569 /* Initialize a variable CUM of type CUMULATIVE_ARGS
570 for a call to a function whose data type is FNTYPE.
571 For a library call, FNTYPE is 0. */
573 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
576 /* Define intermediate macro to compute
577 the size (in registers) of an argument. */
579 #define ALPHA_ARG_SIZE(MODE, TYPE) \
580 ((MODE) == TFmode || (MODE) == TCmode ? 1 \
581 : CEIL (((MODE) == BLKmode \
582 ? int_size_in_bytes (TYPE) \
583 : GET_MODE_SIZE (MODE)), \
586 /* Make (or fake) .linkage entry for function call.
587 IS_LOCAL is 0 if name is used in call, 1 if name is used in definition. */
589 /* This macro defines the start of an assembly comment. */
591 #define ASM_COMMENT_START " #"
593 /* This macro produces the initial definition of a function. */
595 #undef ASM_DECLARE_FUNCTION_NAME
596 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL) \
597 alpha_start_function(FILE,NAME,DECL);
599 /* This macro closes up a function definition for the assembler. */
601 #undef ASM_DECLARE_FUNCTION_SIZE
602 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \
603 alpha_end_function(FILE,NAME,DECL)
605 /* Output any profiling code before the prologue. */
607 #define PROFILE_BEFORE_PROLOGUE 1
609 /* Never use profile counters. */
611 #define NO_PROFILE_COUNTERS 1
613 /* Output assembler code to FILE to increment profiler label # LABELNO
614 for profiling a function entry. Under OSF/1, profiling is enabled
615 by simply passing -pg to the assembler and linker. */
617 #define FUNCTION_PROFILER(FILE, LABELNO)
619 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
620 the stack pointer does not matter. The value is tested only in
621 functions that have frame pointers.
622 No definition is equivalent to always zero. */
624 #define EXIT_IGNORE_STACK 1
626 /* Define registers used by the epilogue and return instruction. */
628 #define EPILOGUE_USES(REGNO) ((REGNO) == 26)
630 /* Length in units of the trampoline for entering a nested function. */
632 #define TRAMPOLINE_SIZE 32
634 /* The alignment of a trampoline, in bits. */
636 #define TRAMPOLINE_ALIGNMENT 64
638 /* A C expression whose value is RTL representing the value of the return
639 address for the frame COUNT steps up from the current frame.
640 FRAMEADDR is the frame pointer of the COUNT frame, or the frame pointer of
641 the COUNT-1 frame if RETURN_ADDR_IN_PREVIOUS_FRAME is defined. */
643 #define RETURN_ADDR_RTX alpha_return_addr
645 /* Provide a definition of DWARF_FRAME_REGNUM here so that fallback unwinders
646 can use DWARF_ALT_FRAME_RETURN_COLUMN defined below. This is just the same
647 as the default definition in dwarf2out.c. */
648 #undef DWARF_FRAME_REGNUM
649 #define DWARF_FRAME_REGNUM(REG) DBX_REGISTER_NUMBER (REG)
651 /* Before the prologue, RA lives in $26. */
652 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 26)
653 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (26)
654 #define DWARF_ALT_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (64)
655 #define DWARF_ZERO_REG 31
657 /* Describe how we implement __builtin_eh_return. */
658 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + 16 : INVALID_REGNUM)
659 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, 28)
660 #define EH_RETURN_HANDLER_RTX \
661 gen_rtx_MEM (Pmode, plus_constant (Pmode, stack_pointer_rtx, \
662 crtl->outgoing_args_size))
664 /* Addressing modes, and classification of registers for them. */
666 /* Macros to check register numbers against specific register classes. */
668 /* These assume that REGNO is a hard or pseudo reg number.
669 They give nonzero only if REGNO is a hard reg of the suitable class
670 or a pseudo reg currently allocated to a suitable hard reg.
671 Since they use reg_renumber, they are safe only once reg_renumber
672 has been allocated, which happens in reginfo.c during register
675 #define REGNO_OK_FOR_INDEX_P(REGNO) 0
676 #define REGNO_OK_FOR_BASE_P(REGNO) \
677 ((REGNO) < 32 || (unsigned) reg_renumber[REGNO] < 32 \
678 || (REGNO) == 63 || reg_renumber[REGNO] == 63)
680 /* Maximum number of registers that can appear in a valid memory address. */
681 #define MAX_REGS_PER_ADDRESS 1
683 /* Recognize any constant value that is a valid address. For the Alpha,
684 there are only constants none since we want to use LDA to load any
685 symbolic addresses into registers. */
687 #define CONSTANT_ADDRESS_P(X) \
689 && (unsigned HOST_WIDE_INT) (INTVAL (X) + 0x8000) < 0x10000)
691 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
692 and check its validity for a certain class.
693 We have two alternate definitions for each of them.
694 The usual definition accepts all pseudo regs; the other rejects
695 them unless they have been allocated suitable hard regs.
696 The symbol REG_OK_STRICT causes the latter definition to be used.
698 Most source files want to accept pseudo regs in the hope that
699 they will get allocated to the class that the insn wants them to be in.
700 Source files for reload pass need to be strict.
701 After reload, it makes no difference, since pseudo regs have
702 been eliminated by then. */
704 /* Nonzero if X is a hard reg that can be used as an index
705 or if it is a pseudo reg. */
706 #define REG_OK_FOR_INDEX_P(X) 0
708 /* Nonzero if X is a hard reg that can be used as a base reg
709 or if it is a pseudo reg. */
710 #define NONSTRICT_REG_OK_FOR_BASE_P(X) \
711 (REGNO (X) < 32 || REGNO (X) == 63 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
713 /* ??? Nonzero if X is the frame pointer, or some virtual register
714 that may eliminate to the frame pointer. These will be allowed to
715 have offsets greater than 32K. This is done because register
716 elimination offsets will change the hi/lo split, and if we split
717 before reload, we will require additional instructions. */
718 #define NONSTRICT_REG_OK_FP_BASE_P(X) \
719 (REGNO (X) == 31 || REGNO (X) == 63 \
720 || (REGNO (X) >= FIRST_PSEUDO_REGISTER \
721 && REGNO (X) < LAST_VIRTUAL_POINTER_REGISTER))
723 /* Nonzero if X is a hard reg that can be used as a base reg. */
724 #define STRICT_REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
727 #define REG_OK_FOR_BASE_P(X) STRICT_REG_OK_FOR_BASE_P (X)
729 #define REG_OK_FOR_BASE_P(X) NONSTRICT_REG_OK_FOR_BASE_P (X)
732 /* Try a machine-dependent way of reloading an illegitimate address
733 operand. If we find one, push the reload and jump to WIN. This
734 macro is used in only one place: `find_reloads_address' in reload.c. */
736 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN) \
738 rtx new_x = alpha_legitimize_reload_address (X, MODE, OPNUM, TYPE, IND_L); \
747 /* Specify the machine mode that this machine uses
748 for the index in the tablejump instruction. */
749 #define CASE_VECTOR_MODE SImode
751 /* Define as C expression which evaluates to nonzero if the tablejump
752 instruction expects the table to contain offsets from the address of the
755 Do not define this if the table should contain absolute addresses.
756 On the Alpha, the table is really GP-relative, not relative to the PC
757 of the table, but we pretend that it is PC-relative; this should be OK,
758 but we should try to find some better way sometime. */
759 #define CASE_VECTOR_PC_RELATIVE 1
761 /* Define this as 1 if `char' should by default be signed; else as 0. */
762 #define DEFAULT_SIGNED_CHAR 1
764 /* Max number of bytes we can move to or from memory
765 in one reasonably fast instruction. */
769 /* If a memory-to-memory move would take MOVE_RATIO or more simple
770 move-instruction pairs, we will do a movmem or libcall instead.
772 Without byte/word accesses, we want no more than four instructions;
773 with, several single byte accesses are better. */
775 #define MOVE_RATIO(speed) (TARGET_BWX ? 7 : 2)
777 /* Largest number of bytes of an object that can be placed in a register.
778 On the Alpha we have plenty of registers, so use TImode. */
779 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TImode)
781 /* Nonzero if access to memory by bytes is no faster than for words.
782 Also nonzero if doing byte operations (specifically shifts) in registers
785 On the Alpha, we want to not use the byte operation and instead use
786 masking operations to access fields; these will save instructions. */
788 #define SLOW_BYTE_ACCESS 1
790 /* Define if operations between registers always perform the operation
791 on the full register even if a narrower mode is specified. */
792 #define WORD_REGISTER_OPERATIONS 1
794 /* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
795 will either zero-extend or sign-extend. The value of this macro should
796 be the code that says which one of the two operations is implicitly
797 done, UNKNOWN if none. */
798 #define LOAD_EXTEND_OP(MODE) ((MODE) == SImode ? SIGN_EXTEND : ZERO_EXTEND)
800 /* Define if loading short immediate values into registers sign extends. */
801 #define SHORT_IMMEDIATES_SIGN_EXTEND 1
803 /* The CIX ctlz and cttz instructions return 64 for zero. */
804 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 64, \
806 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 64, \
809 /* Define the value returned by a floating-point comparison instruction. */
811 #define FLOAT_STORE_FLAG_VALUE(MODE) \
812 REAL_VALUE_ATOF ((TARGET_FLOAT_VAX ? "0.5" : "2.0"), (MODE))
814 /* Specify the machine mode that pointers have.
815 After generation of rtl, the compiler makes no further distinction
816 between pointers and any other objects of this machine mode. */
819 /* Mode of a function address in a call instruction (for indexing purposes). */
821 #define FUNCTION_MODE Pmode
823 /* Define this if addresses of constant functions
824 shouldn't be put through pseudo regs where they can be cse'd.
825 Desirable on machines where ordinary constants are expensive
826 but a CALL with constant address is cheap.
828 We define this on the Alpha so that gen_call and gen_call_value
829 get to see the SYMBOL_REF (for the hint field of the jsr). It will
830 then copy it into a register, thus actually letting the address be
833 #define NO_FUNCTION_CSE 1
835 /* Define this to be nonzero if shift instructions ignore all but the low-order
837 #define SHIFT_COUNT_TRUNCATED 1
839 /* Control the assembler format that we output. */
841 /* Output to assembler file text saying following lines
842 may contain character constants, extra white space, comments, etc. */
843 #define ASM_APP_ON (TARGET_EXPLICIT_RELOCS ? "\t.set\tmacro\n" : "")
845 /* Output to assembler file text saying following lines
846 no longer contain unusual constructs. */
847 #define ASM_APP_OFF (TARGET_EXPLICIT_RELOCS ? "\t.set\tnomacro\n" : "")
849 #define TEXT_SECTION_ASM_OP "\t.text"
851 /* Output before writable data. */
853 #define DATA_SECTION_ASM_OP "\t.data"
855 /* How to refer to registers in assembler output.
856 This sequence is indexed by compiler's hard-register-number (see above). */
858 #define REGISTER_NAMES \
859 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
860 "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
861 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
862 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "AP", \
863 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", \
864 "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", \
865 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",\
866 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "FP"}
868 /* Strip name encoding when emitting labels. */
870 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
872 const char *name_ = NAME; \
873 if (*name_ == '@' || *name_ == '%') \
878 fputs (user_label_prefix, STREAM); \
879 fputs (name_, STREAM); \
882 /* Globalizing directive for a label. */
883 #define GLOBAL_ASM_OP "\t.globl "
885 /* Use dollar signs rather than periods in special g++ assembler names. */
887 #undef NO_DOLLAR_IN_LABEL
889 /* This is how to store into the string LABEL
890 the symbol_ref name of an internal numbered label where
891 PREFIX is the class of label and NUM is the number within the class.
892 This is suitable for output with `assemble_name'. */
894 #undef ASM_GENERATE_INTERNAL_LABEL
895 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
896 sprintf ((LABEL), "*$%s%ld", (PREFIX), (long)(NUM))
898 /* This is how to output an element of a case-vector that is relative. */
900 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
901 fprintf (FILE, "\t.gprel32 $L%d\n", (VALUE))
903 /* If we use NM, pass -g to it so it only lists globals. */
904 #define NM_FLAGS "-pg"
906 /* Definitions for debugging. */
908 /* Correct the offset of automatic variables and arguments. Note that
909 the Alpha debug format wants all automatic variables and arguments
910 to be in terms of two different offsets from the virtual frame pointer,
911 which is the stack pointer before any adjustment in the function.
912 The offset for the argument pointer is fixed for the native compiler,
913 it is either zero (for the no arguments case) or large enough to hold
914 all argument registers.
915 The offset for the auto pointer is the fourth argument to the .frame
916 directive (local_offset).
917 To stay compatible with the native tools we use the same offsets
918 from the virtual frame pointer and adjust the debugger arg/auto offsets
919 accordingly. These debugger offsets are set up in output_prolog. */
921 extern long alpha_arg_offset
;
922 extern long alpha_auto_offset
;
923 #define DEBUGGER_AUTO_OFFSET(X) \
924 ((GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0) + alpha_auto_offset)
925 #define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET + alpha_arg_offset)
927 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
928 alpha_output_filename (STREAM, NAME)
930 /* By default, turn on GDB extensions. */
931 #define DEFAULT_GDB_EXTENSIONS 1
933 /* The system headers under Alpha systems are generally C++-aware. */
934 #define NO_IMPLICIT_EXTERN_C
936 #define TARGET_SUPPORTS_WIDE_INT 1