| blob | 5d32b702538282590f7325cfe7954492f785b98d |
1 /* Definitions of target machine GNU compiler. IA-64 version.
2 Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by James E. Wilson <wilson@cygnus.com> and
5 David Mosberger <davidm@hpl.hp.com>.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
12 any later version.
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 /* ??? Look at ABI group documents for list of preprocessor macros and
24 other features required for ABI compliance. */
26 /* ??? Functions containing a non-local goto target save many registers. Why?
27 See for instance execute/920428-2.c. */
29 \f
30 /* Run-time target specifications */
32 /* Target CPU builtins. */
33 #define TARGET_CPU_CPP_BUILTINS() \
34 do { \
40 if (TARGET_BIG_ENDIAN) \
42 } while (0)
44 #ifndef SUBTARGET_EXTRA_SPECS
45 #define SUBTARGET_EXTRA_SPECS
46 #endif
48 #define EXTRA_SPECS \
50 SUBTARGET_EXTRA_SPECS
56 /* Variables which are this size or smaller are put in the sdata/sbss
57 sections. */
60 /* If the assembler supports thread-local storage, assume that the
61 system does as well. If a particular target system has an
62 assembler that supports TLS -- but the rest of the system does not
63 support TLS -- that system should explicit define TARGET_HAVE_TLS
64 to false in its own configuration file. */
65 #if !defined(TARGET_HAVE_TLS) && defined(HAVE_AS_TLS)
66 #define TARGET_HAVE_TLS true
67 #endif
69 #define TARGET_TLS14 (ia64_tls_size == 14)
70 #define TARGET_TLS22 (ia64_tls_size == 22)
71 #define TARGET_TLS64 (ia64_tls_size == 64)
73 #define TARGET_HPUX 0
74 #define TARGET_HPUX_LD 0
76 #ifndef TARGET_ILP32
77 #define TARGET_ILP32 0
78 #endif
80 #ifndef HAVE_AS_LTOFFX_LDXMOV_RELOCS
81 #define HAVE_AS_LTOFFX_LDXMOV_RELOCS 0
82 #endif
84 /* Values for TARGET_INLINE_FLOAT_DIV, TARGET_INLINE_INT_DIV, and
85 TARGET_INLINE_SQRT. */
87 enum ia64_inline_type
88 {
92 };
94 /* Default target_flags if no switches are specified */
96 #ifndef TARGET_DEFAULT
97 #define TARGET_DEFAULT (MASK_DWARF2_ASM)
98 #endif
100 #ifndef TARGET_CPU_DEFAULT
101 #define TARGET_CPU_DEFAULT 0
102 #endif
104 /* Which processor to schedule for. The cpu attribute defines a list
105 that mirrors this list, so changes to ia64.md must be made at the
106 same time. */
108 enum processor_type
109 {
111 PROCESSOR_ITANIUM2,
112 PROCESSOR_max
113 };
117 /* Sometimes certain combinations of command options do not make sense on a
118 particular target machine. You can define a macro `OVERRIDE_OPTIONS' to
119 take account of this. This macro, if defined, is executed once just after
120 all the command options have been parsed. */
122 #define OVERRIDE_OPTIONS ia64_override_options ()
124 /* Some machines may desire to change what optimizations are performed for
125 various optimization levels. This macro, if defined, is executed once just
126 after the optimization level is determined and before the remainder of the
127 command options have been parsed. Values set in this macro are used as the
128 default values for the other command line options. */
130 /* #define OPTIMIZATION_OPTIONS(LEVEL,SIZE) */
131 \f
132 /* Driver configuration */
134 /* A C string constant that tells the GCC driver program options to pass to
135 `cc1'. It can also specify how to translate options you give to GCC into
136 options for GCC to pass to the `cc1'. */
138 #undef CC1_SPEC
141 /* A C string constant that tells the GCC driver program options to pass to
142 `cc1plus'. It can also specify how to translate options you give to GCC
143 into options for GCC to pass to the `cc1plus'. */
145 /* #define CC1PLUS_SPEC "" */
146 \f
147 /* Storage Layout */
149 /* Define this macro to have the value 1 if the most significant bit in a byte
150 has the lowest number; otherwise define it to have the value zero. */
152 #define BITS_BIG_ENDIAN 0
154 #define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
156 /* Define this macro to have the value 1 if, in a multiword object, the most
157 significant word has the lowest number. */
159 #define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
161 #if defined(__BIG_ENDIAN__)
162 #define LIBGCC2_WORDS_BIG_ENDIAN 1
163 #else
164 #define LIBGCC2_WORDS_BIG_ENDIAN 0
165 #endif
167 #define UNITS_PER_WORD 8
169 #define POINTER_SIZE (TARGET_ILP32 ? 32 : 64)
171 /* A C expression whose value is zero if pointers that need to be extended
172 from being `POINTER_SIZE' bits wide to `Pmode' are sign-extended and one if
173 they are zero-extended and negative one if there is a ptr_extend operation.
175 You need not define this macro if the `POINTER_SIZE' is equal to the width
176 of `Pmode'. */
177 /* Need this for 32-bit pointers, see hpux.h for setting it. */
178 /* #define POINTERS_EXTEND_UNSIGNED */
180 /* A macro to update MODE and UNSIGNEDP when an object whose type is TYPE and
181 which has the specified mode and signedness is to be stored in a register.
182 This macro is only called when TYPE is a scalar type. */
183 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE) \
184 do \
185 { \
186 if (GET_MODE_CLASS (MODE) == MODE_INT \
187 && GET_MODE_SIZE (MODE) < 4) \
188 (MODE) = SImode; \
189 } \
190 while (0)
192 #define PARM_BOUNDARY 64
194 /* Define this macro if you wish to preserve a certain alignment for the stack
195 pointer. The definition is a C expression for the desired alignment
196 (measured in bits). */
198 #define STACK_BOUNDARY 128
200 /* Align frames on double word boundaries */
201 #ifndef IA64_STACK_ALIGN
202 #define IA64_STACK_ALIGN(LOC) (((LOC) + 15) & ~15)
203 #endif
205 #define FUNCTION_BOUNDARY 128
207 /* Optional x86 80-bit float, quad-precision 128-bit float, and quad-word
208 128-bit integers all require 128-bit alignment. */
209 #define BIGGEST_ALIGNMENT 128
211 /* If defined, a C expression to compute the alignment for a static variable.
212 TYPE is the data type, and ALIGN is the alignment that the object
213 would ordinarily have. The value of this macro is used instead of that
214 alignment to align the object. */
216 #define DATA_ALIGNMENT(TYPE, ALIGN) \
217 (TREE_CODE (TYPE) == ARRAY_TYPE \
218 && TYPE_MODE (TREE_TYPE (TYPE)) == QImode \
219 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
221 /* If defined, a C expression to compute the alignment given to a constant that
222 is being placed in memory. CONSTANT is the constant and ALIGN is the
223 alignment that the object would ordinarily have. The value of this macro is
224 used instead of that alignment to align the object. */
226 #define CONSTANT_ALIGNMENT(EXP, ALIGN) \
227 (TREE_CODE (EXP) == STRING_CST \
228 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
230 #define STRICT_ALIGNMENT 1
232 /* Define this if you wish to imitate the way many other C compilers handle
233 alignment of bitfields and the structures that contain them.
234 The behavior is that the type written for a bit-field (`int', `short', or
235 other integer type) imposes an alignment for the entire structure, as if the
236 structure really did contain an ordinary field of that type. In addition,
237 the bit-field is placed within the structure so that it would fit within such
238 a field, not crossing a boundary for it. */
239 #define PCC_BITFIELD_TYPE_MATTERS 1
241 /* An integer expression for the size in bits of the largest integer machine
242 mode that should actually be used. */
244 /* Allow pairs of registers to be used, which is the intent of the default. */
245 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TImode)
247 /* By default, the C++ compiler will use function addresses in the
248 vtable entries. Setting this nonzero tells the compiler to use
249 function descriptors instead. The value of this macro says how
250 many words wide the descriptor is (normally 2). It is assumed
251 that the address of a function descriptor may be treated as a
252 pointer to a function.
254 For reasons known only to HP, the vtable entries (as opposed to
255 normal function descriptors) are 16 bytes wide in 32-bit mode as
256 well, even though the 3rd and 4th words are unused. */
257 #define TARGET_VTABLE_USES_DESCRIPTORS (TARGET_ILP32 ? 4 : 2)
259 /* Due to silliness in the HPUX linker, vtable entries must be
260 8-byte aligned even in 32-bit mode. Rather than create multiple
261 ABIs, force this restriction on everyone else too. */
262 #define TARGET_VTABLE_ENTRY_ALIGN 64
264 /* Due to the above, we need extra padding for the data entries below 0
265 to retain the alignment of the descriptors. */
266 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE (TARGET_ILP32 ? 2 : 1)
267 \f
268 /* Layout of Source Language Data Types */
270 #define INT_TYPE_SIZE 32
272 #define SHORT_TYPE_SIZE 16
274 #define LONG_TYPE_SIZE (TARGET_ILP32 ? 32 : 64)
276 #define LONG_LONG_TYPE_SIZE 64
278 #define FLOAT_TYPE_SIZE 32
280 #define DOUBLE_TYPE_SIZE 64
282 /* long double is XFmode normally, TFmode for HPUX. */
283 #define LONG_DOUBLE_TYPE_SIZE (TARGET_HPUX ? 128 : 80)
285 /* We always want the XFmode operations from libgcc2.c. */
286 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
288 /* On HP-UX, we use the l suffix for TFmode in libgcc2.c. */
289 #define LIBGCC2_TF_CEXT l
291 #define DEFAULT_SIGNED_CHAR 1
293 /* A C expression for a string describing the name of the data type to use for
294 size values. The typedef name `size_t' is defined using the contents of the
295 string. */
296 /* ??? Needs to be defined for P64 code. */
297 /* #define SIZE_TYPE */
299 /* A C expression for a string describing the name of the data type to use for
300 the result of subtracting two pointers. The typedef name `ptrdiff_t' is
301 defined using the contents of the string. See `SIZE_TYPE' above for more
302 information. */
303 /* ??? Needs to be defined for P64 code. */
304 /* #define PTRDIFF_TYPE */
306 /* A C expression for a string describing the name of the data type to use for
307 wide characters. The typedef name `wchar_t' is defined using the contents
308 of the string. See `SIZE_TYPE' above for more information. */
309 /* #define WCHAR_TYPE */
311 /* A C expression for the size in bits of the data type for wide characters.
312 This is used in `cpp', which cannot make use of `WCHAR_TYPE'. */
313 /* #define WCHAR_TYPE_SIZE */
315 \f
316 /* Register Basics */
318 /* Number of hardware registers known to the compiler.
319 We have 128 general registers, 128 floating point registers,
320 64 predicate registers, 8 branch registers, one frame pointer,
321 and several "application" registers. */
323 #define FIRST_PSEUDO_REGISTER 334
325 /* Ranges for the various kinds of registers. */
326 #define ADDL_REGNO_P(REGNO) ((unsigned HOST_WIDE_INT) (REGNO) <= 3)
327 #define GR_REGNO_P(REGNO) ((unsigned HOST_WIDE_INT) (REGNO) <= 127)
328 #define FR_REGNO_P(REGNO) ((REGNO) >= 128 && (REGNO) <= 255)
329 #define FP_REGNO_P(REGNO) ((REGNO) >= 128 && (REGNO) <= 254 && (REGNO) != 159)
330 #define PR_REGNO_P(REGNO) ((REGNO) >= 256 && (REGNO) <= 319)
331 #define BR_REGNO_P(REGNO) ((REGNO) >= 320 && (REGNO) <= 327)
332 #define GENERAL_REGNO_P(REGNO) \
333 (GR_REGNO_P (REGNO) || (REGNO) == FRAME_POINTER_REGNUM)
335 #define GR_REG(REGNO) ((REGNO) + 0)
336 #define FR_REG(REGNO) ((REGNO) + 128)
337 #define PR_REG(REGNO) ((REGNO) + 256)
338 #define BR_REG(REGNO) ((REGNO) + 320)
339 #define OUT_REG(REGNO) ((REGNO) + 120)
340 #define IN_REG(REGNO) ((REGNO) + 112)
341 #define LOC_REG(REGNO) ((REGNO) + 32)
343 #define AR_CCV_REGNUM 329
344 #define AR_UNAT_REGNUM 330
345 #define AR_PFS_REGNUM 331
346 #define AR_LC_REGNUM 332
347 #define AR_EC_REGNUM 333
349 #define IN_REGNO_P(REGNO) ((REGNO) >= IN_REG (0) && (REGNO) <= IN_REG (7))
350 #define LOC_REGNO_P(REGNO) ((REGNO) >= LOC_REG (0) && (REGNO) <= LOC_REG (79))
351 #define OUT_REGNO_P(REGNO) ((REGNO) >= OUT_REG (0) && (REGNO) <= OUT_REG (7))
353 #define AR_M_REGNO_P(REGNO) ((REGNO) == AR_CCV_REGNUM \
354 || (REGNO) == AR_UNAT_REGNUM)
355 #define AR_I_REGNO_P(REGNO) ((REGNO) >= AR_PFS_REGNUM \
356 && (REGNO) < FIRST_PSEUDO_REGISTER)
357 #define AR_REGNO_P(REGNO) ((REGNO) >= AR_CCV_REGNUM \
358 && (REGNO) < FIRST_PSEUDO_REGISTER)
361 /* ??? Don't really need two sets of macros. I like this one better because
362 it is less typing. */
363 #define R_GR(REGNO) GR_REG (REGNO)
364 #define R_FR(REGNO) FR_REG (REGNO)
365 #define R_PR(REGNO) PR_REG (REGNO)
366 #define R_BR(REGNO) BR_REG (REGNO)
368 /* An initializer that says which registers are used for fixed purposes all
369 throughout the compiled code and are therefore not available for general
370 allocation.
372 r0: constant 0
373 r1: global pointer (gp)
374 r12: stack pointer (sp)
375 r13: thread pointer (tp)
376 f0: constant 0.0
377 f1: constant 1.0
378 p0: constant true
379 fp: eliminable frame pointer */
381 /* The last 16 stacked regs are reserved for the 8 input and 8 output
382 registers. */
384 #define FIXED_REGISTERS \
386 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, \
387 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
388 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
389 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
390 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
391 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
392 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
393 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
395 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
396 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
397 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
398 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
399 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
400 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
401 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
402 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
404 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
405 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
406 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
407 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
409 0, 0, 0, 0, 0, 0, 0, 0, \
411 1, 1, 1, 1, 0, 1 \
412 }
414 /* Like `FIXED_REGISTERS' but has 1 for each register that is clobbered
415 (in general) by function calls as well as for fixed registers. This
416 macro therefore identifies the registers that are not available for
417 general allocation of values that must live across function calls. */
419 #define CALL_USED_REGISTERS \
421 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, \
422 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
423 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
424 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
425 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
426 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
427 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
428 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, \
430 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
431 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
432 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
433 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
434 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
435 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
436 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
437 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
439 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
440 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
441 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
442 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
444 1, 0, 0, 0, 0, 0, 1, 1, \
446 1, 1, 1, 1, 0, 1 \
447 }
449 /* Like `CALL_USED_REGISTERS' but used to overcome a historical
450 problem which makes CALL_USED_REGISTERS *always* include
451 all the FIXED_REGISTERS. Until this problem has been
452 resolved this macro can be used to overcome this situation.
453 In particular, block_propagate() requires this list
454 be accurate, or we can remove registers which should be live.
455 This macro is used in regs_invalidated_by_call. */
457 #define CALL_REALLY_USED_REGISTERS \
459 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, \
460 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
461 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
462 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
463 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
464 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
465 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
466 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, \
468 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
469 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
470 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
471 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
472 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
473 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
474 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
475 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
477 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
478 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
479 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
480 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
482 1, 0, 0, 0, 0, 0, 1, 1, \
484 0, 1, 0, 1, 0, 0 \
485 }
488 /* Define this macro if the target machine has register windows. This C
489 expression returns the register number as seen by the called function
490 corresponding to the register number OUT as seen by the calling function.
491 Return OUT if register number OUT is not an outbound register. */
493 #define INCOMING_REGNO(OUT) \
494 ((unsigned) ((OUT) - OUT_REG (0)) < 8 ? IN_REG ((OUT) - OUT_REG (0)) : (OUT))
496 /* Define this macro if the target machine has register windows. This C
497 expression returns the register number as seen by the calling function
498 corresponding to the register number IN as seen by the called function.
499 Return IN if register number IN is not an inbound register. */
501 #define OUTGOING_REGNO(IN) \
502 ((unsigned) ((IN) - IN_REG (0)) < 8 ? OUT_REG ((IN) - IN_REG (0)) : (IN))
504 /* Define this macro if the target machine has register windows. This
505 C expression returns true if the register is call-saved but is in the
506 register window. */
508 #define LOCAL_REGNO(REGNO) \
509 (IN_REGNO_P (REGNO) || LOC_REGNO_P (REGNO))
511 /* We define CCImode in ia64-modes.def so we need a selector. */
513 #define SELECT_CC_MODE(OP,X,Y) CCmode
514 \f
515 /* Order of allocation of registers */
517 /* If defined, an initializer for a vector of integers, containing the numbers
518 of hard registers in the order in which GCC should prefer to use them
519 (from most preferred to least).
521 If this macro is not defined, registers are used lowest numbered first (all
522 else being equal).
524 One use of this macro is on machines where the highest numbered registers
525 must always be saved and the save-multiple-registers instruction supports
526 only sequences of consecutive registers. On such machines, define
527 `REG_ALLOC_ORDER' to be an initializer that lists the highest numbered
528 allocatable register first. */
530 /* ??? Should the GR return value registers come before or after the rest
531 of the caller-save GRs? */
533 #define REG_ALLOC_ORDER \
534 { \
536 R_GR (14), R_GR (15), R_GR (16), R_GR (17), \
537 R_GR (18), R_GR (19), R_GR (20), R_GR (21), R_GR (22), R_GR (23), \
538 R_GR (24), R_GR (25), R_GR (26), R_GR (27), R_GR (28), R_GR (29), \
539 R_GR (30), R_GR (31), \
541 R_GR (120), R_GR (121), R_GR (122), R_GR (123), R_GR (124), R_GR (125), \
542 R_GR (126), R_GR (127), \
544 R_GR (8), R_GR (9), R_GR (10), R_GR (11), \
546 R_GR (2), R_GR (3), \
548 R_FR (6), R_FR (7), \
550 R_FR (8), R_FR (9), R_FR (10), R_FR (11), \
551 R_FR (12), R_FR (13), R_FR (14), R_FR (15), \
553 R_FR (32), R_FR (33), R_FR (34), R_FR (35), \
554 R_FR (36), R_FR (37), R_FR (38), R_FR (39), R_FR (40), R_FR (41), \
555 R_FR (42), R_FR (43), R_FR (44), R_FR (45), R_FR (46), R_FR (47), \
556 R_FR (48), R_FR (49), R_FR (50), R_FR (51), R_FR (52), R_FR (53), \
557 R_FR (54), R_FR (55), R_FR (56), R_FR (57), R_FR (58), R_FR (59), \
558 R_FR (60), R_FR (61), R_FR (62), R_FR (63), R_FR (64), R_FR (65), \
559 R_FR (66), R_FR (67), R_FR (68), R_FR (69), R_FR (70), R_FR (71), \
560 R_FR (72), R_FR (73), R_FR (74), R_FR (75), R_FR (76), R_FR (77), \
561 R_FR (78), R_FR (79), R_FR (80), R_FR (81), R_FR (82), R_FR (83), \
562 R_FR (84), R_FR (85), R_FR (86), R_FR (87), R_FR (88), R_FR (89), \
563 R_FR (90), R_FR (91), R_FR (92), R_FR (93), R_FR (94), R_FR (95), \
564 R_FR (96), R_FR (97), R_FR (98), R_FR (99), R_FR (100), R_FR (101), \
565 R_FR (102), R_FR (103), R_FR (104), R_FR (105), R_FR (106), R_FR (107), \
566 R_FR (108), R_FR (109), R_FR (110), R_FR (111), R_FR (112), R_FR (113), \
567 R_FR (114), R_FR (115), R_FR (116), R_FR (117), R_FR (118), R_FR (119), \
568 R_FR (120), R_FR (121), R_FR (122), R_FR (123), R_FR (124), R_FR (125), \
569 R_FR (126), R_FR (127), \
571 R_PR (6), R_PR (7), R_PR (8), R_PR (9), R_PR (10), R_PR (11), \
572 R_PR (12), R_PR (13), R_PR (14), R_PR (15), \
574 R_PR (16), R_PR (17), \
575 R_PR (18), R_PR (19), R_PR (20), R_PR (21), R_PR (22), R_PR (23), \
576 R_PR (24), R_PR (25), R_PR (26), R_PR (27), R_PR (28), R_PR (29), \
577 R_PR (30), R_PR (31), R_PR (32), R_PR (33), R_PR (34), R_PR (35), \
578 R_PR (36), R_PR (37), R_PR (38), R_PR (39), R_PR (40), R_PR (41), \
579 R_PR (42), R_PR (43), R_PR (44), R_PR (45), R_PR (46), R_PR (47), \
580 R_PR (48), R_PR (49), R_PR (50), R_PR (51), R_PR (52), R_PR (53), \
581 R_PR (54), R_PR (55), R_PR (56), R_PR (57), R_PR (58), R_PR (59), \
582 R_PR (60), R_PR (61), R_PR (62), R_PR (63), \
584 R_BR (6), R_BR (7), \
585 \
587 R_GR (32), R_GR (33), R_GR (34), R_GR (35), \
588 R_GR (36), R_GR (37), R_GR (38), R_GR (39), R_GR (40), R_GR (41), \
589 R_GR (42), R_GR (43), R_GR (44), R_GR (45), R_GR (46), R_GR (47), \
590 R_GR (48), R_GR (49), R_GR (50), R_GR (51), R_GR (52), R_GR (53), \
591 R_GR (54), R_GR (55), R_GR (56), R_GR (57), R_GR (58), R_GR (59), \
592 R_GR (60), R_GR (61), R_GR (62), R_GR (63), R_GR (64), R_GR (65), \
593 R_GR (66), R_GR (67), R_GR (68), R_GR (69), R_GR (70), R_GR (71), \
594 R_GR (72), R_GR (73), R_GR (74), R_GR (75), R_GR (76), R_GR (77), \
595 R_GR (78), R_GR (79), R_GR (80), R_GR (81), R_GR (82), R_GR (83), \
596 R_GR (84), R_GR (85), R_GR (86), R_GR (87), R_GR (88), R_GR (89), \
597 R_GR (90), R_GR (91), R_GR (92), R_GR (93), R_GR (94), R_GR (95), \
598 R_GR (96), R_GR (97), R_GR (98), R_GR (99), R_GR (100), R_GR (101), \
599 R_GR (102), R_GR (103), R_GR (104), R_GR (105), R_GR (106), R_GR (107), \
600 R_GR (108), \
602 R_GR (112), R_GR (113), R_GR (114), R_GR (115), R_GR (116), R_GR (117), \
603 R_GR (118), R_GR (119), \
605 R_GR (4), R_GR (5), R_GR (6), R_GR (7), \
607 R_FR (2), R_FR (3), R_FR (4), R_FR (5), R_FR (16), R_FR (17), \
608 R_FR (18), R_FR (19), R_FR (20), R_FR (21), R_FR (22), R_FR (23), \
609 R_FR (24), R_FR (25), R_FR (26), R_FR (27), R_FR (28), R_FR (29), \
610 R_FR (30), R_FR (31), \
612 R_PR (1), R_PR (2), R_PR (3), R_PR (4), R_PR (5), \
614 R_BR (1), R_BR (2), R_BR (3), R_BR (4), R_BR (5), \
615 \
617 R_GR (109), R_GR (110), R_GR (111), \
618 \
620 R_GR (0), R_GR (1), R_GR (12), R_GR (13), \
622 R_FR (0), R_FR (1), \
624 R_PR (0), \
626 R_BR (0), \
628 FRAME_POINTER_REGNUM, \
629 AR_CCV_REGNUM, AR_UNAT_REGNUM, AR_PFS_REGNUM, AR_LC_REGNUM, \
630 AR_EC_REGNUM \
631 }
632 \f
633 /* How Values Fit in Registers */
635 /* A C expression for the number of consecutive hard registers, starting at
636 register number REGNO, required to hold a value of mode MODE. */
638 /* ??? We say that BImode PR values require two registers. This allows us to
639 easily store the normal and inverted values. We use CCImode to indicate
640 a single predicate register. */
642 #define HARD_REGNO_NREGS(REGNO, MODE) \
643 ((REGNO) == PR_REG (0) && (MODE) == DImode ? 64 \
644 : PR_REGNO_P (REGNO) && (MODE) == BImode ? 2 \
645 : PR_REGNO_P (REGNO) && (MODE) == CCImode ? 1 \
646 : FR_REGNO_P (REGNO) && (MODE) == XFmode ? 1 \
647 : FR_REGNO_P (REGNO) && (MODE) == RFmode ? 1 \
648 : FR_REGNO_P (REGNO) && (MODE) == XCmode ? 2 \
649 : (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
651 /* A C expression that is nonzero if it is permissible to store a value of mode
652 MODE in hard register number REGNO (or in several registers starting with
653 that one). */
655 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
656 (FR_REGNO_P (REGNO) ? \
657 GET_MODE_CLASS (MODE) != MODE_CC && \
658 (MODE) != BImode && \
659 (MODE) != TFmode \
660 : PR_REGNO_P (REGNO) ? \
661 (MODE) == BImode || GET_MODE_CLASS (MODE) == MODE_CC \
662 : GR_REGNO_P (REGNO) ? \
663 (MODE) != CCImode && (MODE) != XFmode && (MODE) != XCmode && (MODE) != RFmode \
664 : AR_REGNO_P (REGNO) ? (MODE) == DImode \
665 : BR_REGNO_P (REGNO) ? (MODE) == DImode \
666 : 0)
668 /* A C expression that is nonzero if it is desirable to choose register
669 allocation so as to avoid move instructions between a value of mode MODE1
670 and a value of mode MODE2.
672 If `HARD_REGNO_MODE_OK (R, MODE1)' and `HARD_REGNO_MODE_OK (R, MODE2)' are
673 ever different for any R, then `MODES_TIEABLE_P (MODE1, MODE2)' must be
674 zero. */
675 /* Don't tie integer and FP modes, as that causes us to get integer registers
676 allocated for FP instructions. XFmode only supported in FP registers so
677 we can't tie it with any other modes. */
678 #define MODES_TIEABLE_P(MODE1, MODE2) \
679 (GET_MODE_CLASS (MODE1) == GET_MODE_CLASS (MODE2) \
680 && ((((MODE1) == XFmode) || ((MODE1) == XCmode) || ((MODE1) == RFmode)) \
681 == (((MODE2) == XFmode) || ((MODE2) == XCmode) || ((MODE2) == RFmode))) \
682 && (((MODE1) == BImode) == ((MODE2) == BImode)))
684 /* Specify the modes required to caller save a given hard regno.
685 We need to ensure floating pt regs are not saved as DImode. */
687 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
688 ((FR_REGNO_P (REGNO) && (NREGS) == 1) ? RFmode \
689 : choose_hard_reg_mode ((REGNO), (NREGS), false))
690 \f
691 /* Handling Leaf Functions */
693 /* A C initializer for a vector, indexed by hard register number, which
694 contains 1 for a register that is allowable in a candidate for leaf function
695 treatment. */
696 /* ??? This might be useful. */
697 /* #define LEAF_REGISTERS */
699 /* A C expression whose value is the register number to which REGNO should be
700 renumbered, when a function is treated as a leaf function. */
701 /* ??? This might be useful. */
702 /* #define LEAF_REG_REMAP(REGNO) */
704 \f
705 /* Register Classes */
707 /* An enumeral type that must be defined with all the register class names as
708 enumeral values. `NO_REGS' must be first. `ALL_REGS' must be the last
709 register class, followed by one more enumeral value, `LIM_REG_CLASSES',
710 which is not a register class but rather tells how many classes there
711 are. */
712 /* ??? When compiling without optimization, it is possible for the only use of
713 a pseudo to be a parameter load from the stack with a REG_EQUIV note.
714 Regclass handles this case specially and does not assign any costs to the
715 pseudo. The pseudo then ends up using the last class before ALL_REGS.
716 Thus we must not let either PR_REGS or BR_REGS be the last class. The
717 testcase for this is gcc.c-torture/execute/va-arg-7.c. */
718 enum reg_class
719 {
720 NO_REGS,
721 PR_REGS,
722 BR_REGS,
723 AR_M_REGS,
724 AR_I_REGS,
725 ADDL_REGS,
726 GR_REGS,
727 FP_REGS,
728 FR_REGS,
729 GR_AND_BR_REGS,
730 GR_AND_FR_REGS,
731 ALL_REGS,
732 LIM_REG_CLASSES
733 };
735 #define GENERAL_REGS GR_REGS
737 /* The number of distinct register classes. */
738 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
740 /* An initializer containing the names of the register classes as C string
741 constants. These names are used in writing some of the debugging dumps. */
742 #define REG_CLASS_NAMES \
747 /* An initializer containing the contents of the register classes, as integers
748 which are bit masks. The Nth integer specifies the contents of class N.
749 The way the integer MASK is interpreted is that register R is in the class
750 if `MASK & (1 << R)' is 1. */
751 #define REG_CLASS_CONTENTS \
752 { \
754 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
755 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
756 0x00000000, 0x00000000, 0x0000 }, \
758 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
759 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
760 0xFFFFFFFF, 0xFFFFFFFF, 0x0000 }, \
762 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
763 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
764 0x00000000, 0x00000000, 0x00FF }, \
766 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
767 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
768 0x00000000, 0x00000000, 0x0600 }, \
770 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
771 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
772 0x00000000, 0x00000000, 0x3800 }, \
774 { 0x0000000F, 0x00000000, 0x00000000, 0x00000000, \
775 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
776 0x00000000, 0x00000000, 0x0000 }, \
778 { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
779 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
780 0x00000000, 0x00000000, 0x0100 }, \
782 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
783 0x7FFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x7FFFFFFF, \
784 0x00000000, 0x00000000, 0x0000 }, \
786 { 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
787 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
788 0x00000000, 0x00000000, 0x0000 }, \
790 { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
791 0x00000000, 0x00000000, 0x00000000, 0x00000000, \
792 0x00000000, 0x00000000, 0x01FF }, \
794 { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
795 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
796 0x00000000, 0x00000000, 0x0100 }, \
798 { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
799 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
800 0xFFFFFFFF, 0xFFFFFFFF, 0x3FFF }, \
801 }
803 /* A C expression whose value is a register class containing hard register
804 REGNO. In general there is more than one such class; choose a class which
805 is "minimal", meaning that no smaller class also contains the register. */
806 /* The NO_REGS case is primarily for the benefit of rws_access_reg, which
807 may call here with private (invalid) register numbers, such as
808 REG_VOLATILE. */
809 #define REGNO_REG_CLASS(REGNO) \
810 (ADDL_REGNO_P (REGNO) ? ADDL_REGS \
811 : GENERAL_REGNO_P (REGNO) ? GR_REGS \
812 : FR_REGNO_P (REGNO) ? (REGNO) != R_FR (31) \
813 && (REGNO) != R_FR(127) ? FP_REGS : FR_REGS \
814 : PR_REGNO_P (REGNO) ? PR_REGS \
815 : BR_REGNO_P (REGNO) ? BR_REGS \
816 : AR_M_REGNO_P (REGNO) ? AR_M_REGS \
817 : AR_I_REGNO_P (REGNO) ? AR_I_REGS \
818 : NO_REGS)
820 /* A macro whose definition is the name of the class to which a valid base
821 register must belong. A base register is one used in an address which is
822 the register value plus a displacement. */
823 #define BASE_REG_CLASS GENERAL_REGS
825 /* A macro whose definition is the name of the class to which a valid index
826 register must belong. An index register is one used in an address where its
827 value is either multiplied by a scale factor or added to another register
828 (as well as added to a displacement). This is needed for POST_MODIFY. */
829 #define INDEX_REG_CLASS GENERAL_REGS
831 /* A C expression which is nonzero if register number NUM is suitable for use
832 as a base register in operand addresses. It may be either a suitable hard
833 register or a pseudo register that has been allocated such a hard reg. */
834 #define REGNO_OK_FOR_BASE_P(REGNO) \
835 (GENERAL_REGNO_P (REGNO) || GENERAL_REGNO_P (reg_renumber[REGNO]))
837 /* A C expression which is nonzero if register number NUM is suitable for use
838 as an index register in operand addresses. It may be either a suitable hard
839 register or a pseudo register that has been allocated such a hard reg.
840 This is needed for POST_MODIFY. */
841 #define REGNO_OK_FOR_INDEX_P(NUM) REGNO_OK_FOR_BASE_P (NUM)
843 /* A C expression that places additional restrictions on the register class to
844 use when it is necessary to copy value X into a register in class CLASS.
845 The value is a register class; perhaps CLASS, or perhaps another, smaller
846 class. */
848 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
849 ia64_preferred_reload_class (X, CLASS)
851 /* You should define this macro to indicate to the reload phase that it may
852 need to allocate at least one register for a reload in addition to the
853 register to contain the data. Specifically, if copying X to a register
854 CLASS in MODE requires an intermediate register, you should define this
855 to return the largest register class all of whose registers can be used
856 as intermediate registers or scratch registers. */
858 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X) \
859 ia64_secondary_reload_class (CLASS, MODE, X)
861 /* Certain machines have the property that some registers cannot be copied to
862 some other registers without using memory. Define this macro on those
863 machines to be a C expression that is nonzero if objects of mode M in
864 registers of CLASS1 can only be copied to registers of class CLASS2 by
865 storing a register of CLASS1 into memory and loading that memory location
866 into a register of CLASS2. */
868 #if 0
869 /* ??? May need this, but since we've disallowed XFmode in GR_REGS,
870 I'm not quite sure how it could be invoked. The normal problems
871 with unions should be solved with the addressof fiddling done by
872 movxf and friends. */
873 #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
874 (((MODE) == XFmode || (MODE) == XCmode) \
875 && (((CLASS1) == GR_REGS && (CLASS2) == FR_REGS) \
876 || ((CLASS1) == FR_REGS && (CLASS2) == GR_REGS)))
877 #endif
879 /* A C expression for the maximum number of consecutive registers of
880 class CLASS needed to hold a value of mode MODE.
881 This is closely related to the macro `HARD_REGNO_NREGS'. */
883 #define CLASS_MAX_NREGS(CLASS, MODE) \
884 ((MODE) == BImode && (CLASS) == PR_REGS ? 2 \
885 : (((CLASS) == FR_REGS || (CLASS) == FP_REGS) && (MODE) == XFmode) ? 1 \
886 : (((CLASS) == FR_REGS || (CLASS) == FP_REGS) && (MODE) == RFmode) ? 1 \
887 : (((CLASS) == FR_REGS || (CLASS) == FP_REGS) && (MODE) == XCmode) ? 2 \
888 : (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
890 /* In FP regs, we can't change FP values to integer values and vice versa,
891 but we can change e.g. DImode to SImode, and V2SFmode into DImode. */
893 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
894 (SCALAR_FLOAT_MODE_P (FROM) != SCALAR_FLOAT_MODE_P (TO) \
895 ? reg_classes_intersect_p (CLASS, FR_REGS) : 0)
896 \f
897 /* Basic Stack Layout */
899 /* Define this macro if pushing a word onto the stack moves the stack pointer
900 to a smaller address. */
901 #define STACK_GROWS_DOWNWARD 1
903 /* Define this macro to nonzero if the addresses of local variable slots
904 are at negative offsets from the frame pointer. */
905 #define FRAME_GROWS_DOWNWARD 0
907 /* Offset from the frame pointer to the first local variable slot to
908 be allocated. */
909 #define STARTING_FRAME_OFFSET 0
911 /* Offset from the stack pointer register to the first location at which
912 outgoing arguments are placed. If not specified, the default value of zero
913 is used. This is the proper value for most machines. */
914 /* IA64 has a 16 byte scratch area that is at the bottom of the stack. */
915 #define STACK_POINTER_OFFSET 16
917 /* Offset from the argument pointer register to the first argument's address.
918 On some machines it may depend on the data type of the function. */
919 #define FIRST_PARM_OFFSET(FUNDECL) 0
921 /* A C expression whose value is RTL representing the value of the return
922 address for the frame COUNT steps up from the current frame, after the
923 prologue. */
925 /* ??? Frames other than zero would likely require interpreting the frame
926 unwind info, so we don't try to support them. We would also need to define
927 DYNAMIC_CHAIN_ADDRESS and SETUP_FRAME_ADDRESS (for the reg stack flush). */
929 #define RETURN_ADDR_RTX(COUNT, FRAME) \
930 ia64_return_addr_rtx (COUNT, FRAME)
932 /* A C expression whose value is RTL representing the location of the incoming
933 return address at the beginning of any function, before the prologue. This
934 RTL is either a `REG', indicating that the return value is saved in `REG',
935 or a `MEM' representing a location in the stack. This enables DWARF2
936 unwind info for C++ EH. */
937 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, BR_REG (0))
939 /* A C expression whose value is an integer giving the offset, in bytes, from
940 the value of the stack pointer register to the top of the stack frame at the
941 beginning of any function, before the prologue. The top of the frame is
942 defined to be the value of the stack pointer in the previous frame, just
943 before the call instruction. */
944 /* The CFA is past the red zone, not at the entry-point stack
945 pointer. */
946 #define INCOMING_FRAME_SP_OFFSET STACK_POINTER_OFFSET
948 /* We shorten debug info by using CFA-16 as DW_AT_frame_base. */
949 #define CFA_FRAME_BASE_OFFSET(FUNDECL) (-INCOMING_FRAME_SP_OFFSET)
951 \f
952 /* Register That Address the Stack Frame. */
954 /* The register number of the stack pointer register, which must also be a
955 fixed register according to `FIXED_REGISTERS'. On most machines, the
956 hardware determines which register this is. */
958 #define STACK_POINTER_REGNUM 12
960 /* The register number of the frame pointer register, which is used to access
961 automatic variables in the stack frame. On some machines, the hardware
962 determines which register this is. On other machines, you can choose any
963 register you wish for this purpose. */
965 #define FRAME_POINTER_REGNUM 328
967 /* Base register for access to local variables of the function. */
968 #define HARD_FRAME_POINTER_REGNUM LOC_REG (79)
970 /* The register number of the arg pointer register, which is used to access the
971 function's argument list. */
972 /* r0 won't otherwise be used, so put the always eliminated argument pointer
973 in it. */
974 #define ARG_POINTER_REGNUM R_GR(0)
976 /* Due to the way varargs and argument spilling happens, the argument
977 pointer is not 16-byte aligned like the stack pointer. */
978 #define INIT_EXPANDERS \
979 do { \
980 ia64_init_expanders (); \
981 if (cfun && cfun->emit->regno_pointer_align) \
982 REGNO_POINTER_ALIGN (ARG_POINTER_REGNUM) = 64; \
983 } while (0)
985 /* Register numbers used for passing a function's static chain pointer. */
986 /* ??? The ABI sez the static chain should be passed as a normal parameter. */
987 #define STATIC_CHAIN_REGNUM 15
988 \f
989 /* Eliminating the Frame Pointer and the Arg Pointer */
991 /* A C expression which is nonzero if a function must have and use a frame
992 pointer. This expression is evaluated in the reload pass. If its value is
993 nonzero the function will have a frame pointer. */
994 #define FRAME_POINTER_REQUIRED 0
996 /* Show we can debug even without a frame pointer. */
997 #define CAN_DEBUG_WITHOUT_FP
999 /* If defined, this macro specifies a table of register pairs used to eliminate
1000 unneeded registers that point into the stack frame. */
1002 #define ELIMINABLE_REGS \
1003 { \
1004 {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1005 {ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1006 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1007 {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1008 }
1010 /* A C expression that returns nonzero if the compiler is allowed to try to
1011 replace register number FROM with register number TO. The frame pointer
1012 is automatically handled. */
1014 #define CAN_ELIMINATE(FROM, TO) \
1015 (TO == BR_REG (0) ? current_function_is_leaf : 1)
1017 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'. It
1018 specifies the initial difference between the specified pair of
1019 registers. This macro must be defined if `ELIMINABLE_REGS' is
1020 defined. */
1021 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
1022 ((OFFSET) = ia64_initial_elimination_offset ((FROM), (TO)))
1023 \f
1024 /* Passing Function Arguments on the Stack */
1026 /* If defined, the maximum amount of space required for outgoing arguments will
1027 be computed and placed into the variable
1028 `current_function_outgoing_args_size'. */
1030 #define ACCUMULATE_OUTGOING_ARGS 1
1032 /* A C expression that should indicate the number of bytes of its own arguments
1033 that a function pops on returning, or 0 if the function pops no arguments
1034 and the caller must therefore pop them all after the function returns. */
1036 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACK_SIZE) 0
1038 \f
1039 /* Function Arguments in Registers */
1041 #define MAX_ARGUMENT_SLOTS 8
1042 #define MAX_INT_RETURN_SLOTS 4
1043 #define GR_ARG_FIRST IN_REG (0)
1044 #define GR_RET_FIRST GR_REG (8)
1045 #define GR_RET_LAST GR_REG (11)
1046 #define FR_ARG_FIRST FR_REG (8)
1047 #define FR_RET_FIRST FR_REG (8)
1048 #define FR_RET_LAST FR_REG (15)
1049 #define AR_ARG_FIRST OUT_REG (0)
1051 /* A C expression that controls whether a function argument is passed in a
1052 register, and which register. */
1054 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
1055 ia64_function_arg (&CUM, MODE, TYPE, NAMED, 0)
1057 /* Define this macro if the target machine has "register windows", so that the
1058 register in which a function sees an arguments is not necessarily the same
1059 as the one in which the caller passed the argument. */
1061 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
1062 ia64_function_arg (&CUM, MODE, TYPE, NAMED, 1)
1064 /* A C type for declaring a variable that is used as the first argument of
1065 `FUNCTION_ARG' and other related values. For some target machines, the type
1066 `int' suffices and can hold the number of bytes of argument so far. */
1069 {
1076 /* A C statement (sans semicolon) for initializing the variable CUM for the
1077 state at the beginning of the argument list. */
1079 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
1080 do { \
1081 (CUM).words = 0; \
1082 (CUM).int_regs = 0; \
1083 (CUM).fp_regs = 0; \
1084 (CUM).prototype = ((FNTYPE) && TYPE_ARG_TYPES (FNTYPE)) || (LIBNAME); \
1085 } while (0)
1087 /* Like `INIT_CUMULATIVE_ARGS' but overrides it for the purposes of finding the
1088 arguments for the function being compiled. If this macro is undefined,
1089 `INIT_CUMULATIVE_ARGS' is used instead. */
1091 /* We set prototype to true so that we never try to return a PARALLEL from
1092 function_arg. */
1093 #define INIT_CUMULATIVE_INCOMING_ARGS(CUM, FNTYPE, LIBNAME) \
1094 do { \
1095 (CUM).words = 0; \
1096 (CUM).int_regs = 0; \
1097 (CUM).fp_regs = 0; \
1098 (CUM).prototype = 1; \
1099 } while (0)
1101 /* A C statement (sans semicolon) to update the summarizer variable CUM to
1102 advance past an argument in the argument list. The values MODE, TYPE and
1103 NAMED describe that argument. Once this is done, the variable CUM is
1104 suitable for analyzing the *following* argument with `FUNCTION_ARG'. */
1106 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
1107 ia64_function_arg_advance (&CUM, MODE, TYPE, NAMED)
1109 /* If defined, a C expression that gives the alignment boundary, in bits, of an
1110 argument with the specified mode and type. */
1112 /* Return the alignment boundary in bits for an argument with a specified
1113 mode and type. */
1115 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) \
1116 ia64_function_arg_boundary (MODE, TYPE)
1118 /* A C expression that is nonzero if REGNO is the number of a hard register in
1119 which function arguments are sometimes passed. This does *not* include
1120 implicit arguments such as the static chain and the structure-value address.
1121 On many machines, no registers can be used for this purpose since all
1122 function arguments are pushed on the stack. */
1123 #define FUNCTION_ARG_REGNO_P(REGNO) \
1124 (((REGNO) >= AR_ARG_FIRST && (REGNO) < (AR_ARG_FIRST + MAX_ARGUMENT_SLOTS)) \
1125 || ((REGNO) >= FR_ARG_FIRST && (REGNO) < (FR_ARG_FIRST + MAX_ARGUMENT_SLOTS)))
1126 \f
1127 /* How Scalar Function Values are Returned */
1129 /* A C expression to create an RTX representing the place where a function
1130 returns a value of data type VALTYPE. */
1132 #define FUNCTION_VALUE(VALTYPE, FUNC) \
1133 ia64_function_value (VALTYPE, FUNC)
1135 /* A C expression to create an RTX representing the place where a library
1136 function returns a value of mode MODE. */
1138 #define LIBCALL_VALUE(MODE) \
1139 gen_rtx_REG (MODE, \
1140 (((GET_MODE_CLASS (MODE) == MODE_FLOAT \
1141 || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT) && \
1142 (MODE) != TFmode) \
1143 ? FR_RET_FIRST : GR_RET_FIRST))
1145 /* A C expression that is nonzero if REGNO is the number of a hard register in
1146 which the values of called function may come back. */
1148 #define FUNCTION_VALUE_REGNO_P(REGNO) \
1149 (((REGNO) >= GR_RET_FIRST && (REGNO) <= GR_RET_LAST) \
1150 || ((REGNO) >= FR_RET_FIRST && (REGNO) <= FR_RET_LAST))
1152 \f
1153 /* How Large Values are Returned */
1155 #define DEFAULT_PCC_STRUCT_RETURN 0
1157 \f
1158 /* Caller-Saves Register Allocation */
1160 /* A C expression to determine whether it is worthwhile to consider placing a
1161 pseudo-register in a call-clobbered hard register and saving and restoring
1162 it around each function call. The expression should be 1 when this is worth
1163 doing, and 0 otherwise.
1165 If you don't define this macro, a default is used which is good on most
1166 machines: `4 * CALLS < REFS'. */
1167 /* ??? Investigate. */
1168 /* #define CALLER_SAVE_PROFITABLE(REFS, CALLS) */
1170 \f
1171 /* Function Entry and Exit */
1173 /* Define this macro as a C expression that is nonzero if the return
1174 instruction or the function epilogue ignores the value of the stack pointer;
1175 in other words, if it is safe to delete an instruction to adjust the stack
1176 pointer before a return from the function. */
1178 #define EXIT_IGNORE_STACK 1
1180 /* Define this macro as a C expression that is nonzero for registers
1181 used by the epilogue or the `return' pattern. */
1183 #define EPILOGUE_USES(REGNO) ia64_epilogue_uses (REGNO)
1185 /* Nonzero for registers used by the exception handling mechanism. */
1187 #define EH_USES(REGNO) ia64_eh_uses (REGNO)
1189 /* Output part N of a function descriptor for DECL. For ia64, both
1190 words are emitted with a single relocation, so ignore N > 0. */
1191 #define ASM_OUTPUT_FDESC(FILE, DECL, PART) \
1192 do { \
1193 if ((PART) == 0) \
1194 { \
1195 if (TARGET_ILP32) \
1197 else \
1199 mark_decl_referenced (DECL); \
1200 assemble_name (FILE, XSTR (XEXP (DECL_RTL (DECL), 0), 0)); \
1202 if (TARGET_ILP32) \
1204 } \
1205 } while (0)
1206 \f
1207 /* Generating Code for Profiling. */
1209 /* A C statement or compound statement to output to FILE some assembler code to
1210 call the profiling subroutine `mcount'. */
1212 #undef FUNCTION_PROFILER
1213 #define FUNCTION_PROFILER(FILE, LABELNO) \
1214 ia64_output_function_profiler(FILE, LABELNO)
1216 /* Neither hpux nor linux use profile counters. */
1217 #define NO_PROFILE_COUNTERS 1
1218 \f
1219 /* Trampolines for Nested Functions. */
1221 /* We need 32 bytes, so we can save the sp, ar.rnat, ar.bsp, and ar.pfs of
1222 the function containing a non-local goto target. */
1224 #define STACK_SAVEAREA_MODE(LEVEL) \
1225 ((LEVEL) == SAVE_NONLOCAL ? OImode : Pmode)
1227 /* Output assembler code for a block containing the constant parts of
1228 a trampoline, leaving space for the variable parts.
1230 The trampoline should set the static chain pointer to value placed
1231 into the trampoline and should branch to the specified routine.
1232 To make the normal indirect-subroutine calling convention work,
1233 the trampoline must look like a function descriptor; the first
1234 word being the target address and the second being the target's
1235 global pointer.
1237 We abuse the concept of a global pointer by arranging for it
1238 to point to the data we need to load. The complete trampoline
1239 has the following form:
1241 +-------------------+ \
1242 TRAMP: | __ia64_trampoline | |
1243 +-------------------+ > fake function descriptor
1244 | TRAMP+16 | |
1245 +-------------------+ /
1246 | target descriptor |
1247 +-------------------+
1248 | static link |
1249 +-------------------+
1250 */
1252 /* A C expression for the size in bytes of the trampoline, as an integer. */
1254 #define TRAMPOLINE_SIZE 32
1256 /* Alignment required for trampolines, in bits. */
1258 #define TRAMPOLINE_ALIGNMENT 64
1260 /* A C statement to initialize the variable parts of a trampoline. */
1262 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
1263 ia64_initialize_trampoline((ADDR), (FNADDR), (STATIC_CHAIN))
1264 \f
1265 /* Addressing Modes */
1267 /* Define this macro if the machine supports post-increment addressing. */
1269 #define HAVE_POST_INCREMENT 1
1270 #define HAVE_POST_DECREMENT 1
1271 #define HAVE_POST_MODIFY_DISP 1
1272 #define HAVE_POST_MODIFY_REG 1
1274 /* A C expression that is 1 if the RTX X is a constant which is a valid
1275 address. */
1277 #define CONSTANT_ADDRESS_P(X) 0
1279 /* The max number of registers that can appear in a valid memory address. */
1281 #define MAX_REGS_PER_ADDRESS 2
1283 /* A C compound statement with a conditional `goto LABEL;' executed if X (an
1284 RTX) is a legitimate memory address on the target machine for a memory
1285 operand of mode MODE. */
1287 #define LEGITIMATE_ADDRESS_REG(X) \
1288 ((GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X)) \
1289 || (GET_CODE (X) == SUBREG && GET_CODE (XEXP (X, 0)) == REG \
1290 && REG_OK_FOR_BASE_P (XEXP (X, 0))))
1292 #define LEGITIMATE_ADDRESS_DISP(R, X) \
1293 (GET_CODE (X) == PLUS \
1294 && rtx_equal_p (R, XEXP (X, 0)) \
1295 && (LEGITIMATE_ADDRESS_REG (XEXP (X, 1)) \
1296 || (GET_CODE (XEXP (X, 1)) == CONST_INT \
1297 && INTVAL (XEXP (X, 1)) >= -256 \
1298 && INTVAL (XEXP (X, 1)) < 256)))
1300 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
1301 do { \
1302 if (LEGITIMATE_ADDRESS_REG (X)) \
1303 goto LABEL; \
1304 else if ((GET_CODE (X) == POST_INC || GET_CODE (X) == POST_DEC) \
1305 && LEGITIMATE_ADDRESS_REG (XEXP (X, 0)) \
1306 && XEXP (X, 0) != arg_pointer_rtx) \
1307 goto LABEL; \
1308 else if (GET_CODE (X) == POST_MODIFY \
1309 && LEGITIMATE_ADDRESS_REG (XEXP (X, 0)) \
1310 && XEXP (X, 0) != arg_pointer_rtx \
1311 && LEGITIMATE_ADDRESS_DISP (XEXP (X, 0), XEXP (X, 1))) \
1312 goto LABEL; \
1313 } while (0)
1315 /* A C expression that is nonzero if X (assumed to be a `reg' RTX) is valid for
1316 use as a base register. */
1318 #ifdef REG_OK_STRICT
1319 #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
1320 #else
1321 #define REG_OK_FOR_BASE_P(X) \
1322 (GENERAL_REGNO_P (REGNO (X)) || (REGNO (X) >= FIRST_PSEUDO_REGISTER))
1323 #endif
1325 /* A C expression that is nonzero if X (assumed to be a `reg' RTX) is valid for
1326 use as an index register. This is needed for POST_MODIFY. */
1328 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
1330 /* A C statement or compound statement with a conditional `goto LABEL;'
1331 executed if memory address X (an RTX) can have different meanings depending
1332 on the machine mode of the memory reference it is used for or if the address
1333 is valid for some modes but not others. */
1335 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
1337 /* A C expression that is nonzero if X is a legitimate constant for an
1338 immediate operand on the target machine. */
1340 #define LEGITIMATE_CONSTANT_P(X) ia64_legitimate_constant_p (X)
1341 \f
1342 /* Condition Code Status */
1344 /* One some machines not all possible comparisons are defined, but you can
1345 convert an invalid comparison into a valid one. */
1346 /* ??? Investigate. See the alpha definition. */
1347 /* #define CANONICALIZE_COMPARISON(CODE, OP0, OP1) */
1349 \f
1350 /* Describing Relative Costs of Operations */
1352 /* A C expression for the cost of moving data from a register in class FROM to
1353 one in class TO, using MODE. */
1355 #define REGISTER_MOVE_COST ia64_register_move_cost
1357 /* A C expression for the cost of moving data of mode M between a
1358 register and memory. */
1359 #define MEMORY_MOVE_COST(MODE,CLASS,IN) \
1360 ((CLASS) == GENERAL_REGS || (CLASS) == FR_REGS || (CLASS) == FP_REGS \
1361 || (CLASS) == GR_AND_FR_REGS ? 4 : 10)
1363 /* A C expression for the cost of a branch instruction. A value of 1 is the
1364 default; other values are interpreted relative to that. Used by the
1365 if-conversion code as max instruction count. */
1366 /* ??? This requires investigation. The primary effect might be how
1367 many additional insn groups we run into, vs how good the dynamic
1368 branch predictor is. */
1370 #define BRANCH_COST 6
1372 /* Define this macro as a C expression which is nonzero if accessing less than
1373 a word of memory (i.e. a `char' or a `short') is no faster than accessing a
1374 word of memory. */
1376 #define SLOW_BYTE_ACCESS 1
1378 /* Define this macro if it is as good or better to call a constant function
1379 address than to call an address kept in a register.
1381 Indirect function calls are more expensive that direct function calls, so
1382 don't cse function addresses. */
1384 #define NO_FUNCTION_CSE
1386 \f
1387 /* Dividing the output into sections. */
1389 /* A C expression whose value is a string containing the assembler operation
1390 that should precede instructions and read-only data. */
1394 /* A C expression whose value is a string containing the assembler operation to
1395 identify the following data as writable initialized data. */
1399 /* If defined, a C expression whose value is a string containing the assembler
1400 operation to identify the following data as uninitialized global data. */
1404 #define IA64_DEFAULT_GVALUE 8
1405 \f
1406 /* Position Independent Code. */
1408 /* The register number of the register used to address a table of static data
1409 addresses in memory. */
1411 /* ??? Should modify ia64.md to use pic_offset_table_rtx instead of
1412 gen_rtx_REG (DImode, 1). */
1414 /* ??? Should we set flag_pic? Probably need to define
1415 LEGITIMIZE_PIC_OPERAND_P to make that work. */
1417 #define PIC_OFFSET_TABLE_REGNUM GR_REG (1)
1419 /* Define this macro if the register defined by `PIC_OFFSET_TABLE_REGNUM' is
1420 clobbered by calls. */
1422 #define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
1424 \f
1425 /* The Overall Framework of an Assembler File. */
1427 /* A C string constant describing how to begin a comment in the target
1428 assembler language. The compiler assumes that the comment will end at the
1429 end of the line. */
1433 /* A C string constant for text to be output before each `asm' statement or
1434 group of consecutive ones. */
1438 /* A C string constant for text to be output after each `asm' statement or
1439 group of consecutive ones. */
1442 \f
1443 /* Output of Uninitialized Variables. */
1445 /* This is all handled by svr4.h. */
1447 \f
1448 /* Output and Generation of Labels. */
1450 /* A C statement (sans semicolon) to output to the stdio stream STREAM the
1451 assembler definition of a label named NAME. */
1453 /* See the ASM_OUTPUT_LABELREF definition in sysv4.h for an explanation of
1454 why ia64_asm_output_label exists. */
1457 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
1458 do { \
1459 ia64_asm_output_label = 1; \
1460 assemble_name (STREAM, NAME); \
1462 ia64_asm_output_label = 0; \
1463 } while (0)
1465 /* Globalizing directive for a label. */
1468 /* A C statement (sans semicolon) to output to the stdio stream STREAM any text
1469 necessary for declaring the name of an external symbol named NAME which is
1470 referenced in this compilation but not defined. */
1472 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
1473 ia64_asm_output_external (FILE, DECL, NAME)
1475 /* A C statement to store into the string STRING a label whose name is made
1476 from the string PREFIX and the number NUM. */
1478 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1479 do { \
1481 } while (0)
1483 /* ??? Not sure if using a ? in the name for Intel as is safe. */
1487 /* A C statement to output to the stdio stream STREAM assembler code which
1488 defines (equates) the symbol NAME to have the value VALUE. */
1490 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1491 do { \
1492 assemble_name (STREAM, NAME); \
1494 assemble_name (STREAM, VALUE); \
1496 } while (0)
1498 \f
1499 /* Macros Controlling Initialization Routines. */
1501 /* This is handled by svr4.h and sysv4.h. */
1503 \f
1504 /* Output of Assembler Instructions. */
1506 /* A C initializer containing the assembler's names for the machine registers,
1507 each one as a C string constant. */
1509 #define REGISTER_NAMES \
1510 { \
1557 }
1559 /* If defined, a C initializer for an array of structures containing a name and
1560 a register number. This macro defines additional names for hard registers,
1561 thus allowing the `asm' option in declarations to refer to registers using
1562 alternate names. */
1564 #define ADDITIONAL_REGISTER_NAMES \
1565 { \
1664 }
1666 /* A C compound statement to output to stdio stream STREAM the assembler syntax
1667 for an instruction operand X. X is an RTL expression. */
1669 #define PRINT_OPERAND(STREAM, X, CODE) \
1670 ia64_print_operand (STREAM, X, CODE)
1672 /* A C expression which evaluates to true if CODE is a valid punctuation
1673 character for use in the `PRINT_OPERAND' macro. */
1675 /* ??? Keep this around for now, as we might need it later. */
1677 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1680 /* A C compound statement to output to stdio stream STREAM the assembler syntax
1681 for an instruction operand that is a memory reference whose address is X. X
1682 is an RTL expression. */
1684 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1685 ia64_print_operand_address (STREAM, X)
1687 /* If defined, C string expressions to be used for the `%R', `%L', `%U', and
1688 `%I' options of `asm_fprintf' (see `final.c'). */
1695 \f
1696 /* Output of dispatch tables. */
1698 /* This macro should be provided on machines where the addresses in a dispatch
1699 table are relative to the table's own address. */
1701 /* ??? Depends on the pointer size. */
1703 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1704 do { \
1705 if (TARGET_ILP32) \
1707 else \
1709 } while (0)
1711 /* Jump tables only need 8 byte alignment. */
1713 #define ADDR_VEC_ALIGN(ADDR_VEC) 3
1715 \f
1716 /* Assembler Commands for Exception Regions. */
1718 /* Select a format to encode pointers in exception handling data. CODE
1719 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
1720 true if the symbol may be affected by dynamic relocations. */
1721 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
1722 (((CODE) == 1 ? DW_EH_PE_textrel : DW_EH_PE_datarel) \
1723 | ((GLOBAL) ? DW_EH_PE_indirect : 0) \
1724 | (TARGET_ILP32 ? DW_EH_PE_udata4 : DW_EH_PE_udata8))
1726 /* Handle special EH pointer encodings. Absolute, pc-relative, and
1727 indirect are handled automatically. */
1728 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
1729 do { \
1730 const char *reltag = NULL; \
1731 if (((ENCODING) & 0xF0) == DW_EH_PE_textrel) \
1733 else if (((ENCODING) & 0xF0) == DW_EH_PE_datarel) \
1735 if (reltag) \
1736 { \
1737 fputs (integer_asm_op (SIZE, FALSE), FILE); \
1738 fputs (reltag, FILE); \
1739 assemble_name (FILE, XSTR (ADDR, 0)); \
1741 goto DONE; \
1742 } \
1743 } while (0)
1745 \f
1746 /* Assembler Commands for Alignment. */
1748 /* ??? Investigate. */
1750 /* The alignment (log base 2) to put in front of LABEL, which follows
1751 a BARRIER. */
1753 /* #define LABEL_ALIGN_AFTER_BARRIER(LABEL) */
1755 /* The desired alignment for the location counter at the beginning
1756 of a loop. */
1758 /* #define LOOP_ALIGN(LABEL) */
1760 /* Define this macro if `ASM_OUTPUT_SKIP' should not be used in the text
1761 section because it fails put zeros in the bytes that are skipped. */
1763 #define ASM_NO_SKIP_IN_TEXT 1
1765 /* A C statement to output to the stdio stream STREAM an assembler command to
1766 advance the location counter to a multiple of 2 to the POWER bytes. */
1768 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1771 \f
1772 /* Macros Affecting all Debug Formats. */
1774 /* This is handled in svr4.h and sysv4.h. */
1776 \f
1777 /* Specific Options for DBX Output. */
1779 /* This is handled by dbxelf.h which is included by svr4.h. */
1781 \f
1782 /* Open ended Hooks for DBX Output. */
1784 /* Likewise. */
1786 \f
1787 /* File names in DBX format. */
1789 /* Likewise. */
1791 \f
1792 /* Macros for SDB and Dwarf Output. */
1794 /* Define this macro if GCC should produce dwarf version 2 format debugging
1795 output in response to the `-g' option. */
1797 #define DWARF2_DEBUGGING_INFO 1
1799 /* We do not want call-frame info to be output, since debuggers are
1800 supposed to use the target unwind info. Leave this undefined it
1801 TARGET_UNWIND_INFO might ever be false. */
1803 #define DWARF2_FRAME_INFO 0
1805 #define DWARF2_ASM_LINE_DEBUG_INFO (TARGET_DWARF2_ASM)
1807 /* Use tags for debug info labels, so that they don't break instruction
1808 bundles. This also avoids getting spurious DV warnings from the
1809 assembler. This is similar to (*targetm.asm_out.internal_label), except that we
1810 add brackets around the label. */
1812 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
1815 /* Use section-relative relocations for debugging offsets. Unlike other
1816 targets that fake this by putting the section VMA at 0, IA-64 has
1817 proper relocations for them. */
1818 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION) \
1819 do { \
1820 fputs (integer_asm_op (SIZE, FALSE), FILE); \
1822 assemble_name (FILE, LABEL); \
1824 } while (0)
1826 /* Emit a PC-relative relocation. */
1827 #define ASM_OUTPUT_DWARF_PCREL(FILE, SIZE, LABEL) \
1828 do { \
1829 fputs (integer_asm_op (SIZE, FALSE), FILE); \
1831 assemble_name (FILE, LABEL); \
1833 } while (0)
1834 \f
1835 /* Register Renaming Parameters. */
1837 /* A C expression that is nonzero if hard register number REGNO2 can be
1838 considered for use as a rename register for REGNO1 */
1840 #define HARD_REGNO_RENAME_OK(REGNO1,REGNO2) \
1841 ia64_hard_regno_rename_ok((REGNO1), (REGNO2))
1843 \f
1844 /* Miscellaneous Parameters. */
1846 /* Flag to mark data that is in the small address area (addressable
1847 via "addl", that is, within a 2MByte offset of 0. */
1848 #define SYMBOL_FLAG_SMALL_ADDR (SYMBOL_FLAG_MACH_DEP << 0)
1849 #define SYMBOL_REF_SMALL_ADDR_P(X) \
1850 ((SYMBOL_REF_FLAGS (X) & SYMBOL_FLAG_SMALL_ADDR) != 0)
1852 /* An alias for a machine mode name. This is the machine mode that elements of
1853 a jump-table should have. */
1855 #define CASE_VECTOR_MODE ptr_mode
1857 /* Define as C expression which evaluates to nonzero if the tablejump
1858 instruction expects the table to contain offsets from the address of the
1859 table. */
1861 #define CASE_VECTOR_PC_RELATIVE 1
1863 /* Define this macro if operations between registers with integral mode smaller
1864 than a word are always performed on the entire register. */
1866 #define WORD_REGISTER_OPERATIONS
1868 /* Define this macro to be a C expression indicating when insns that read
1869 memory in MODE, an integral mode narrower than a word, set the bits outside
1870 of MODE to be either the sign-extension or the zero-extension of the data
1871 read. */
1873 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
1875 /* The maximum number of bytes that a single instruction can move quickly from
1876 memory to memory. */
1877 #define MOVE_MAX 8
1879 /* A C expression which is nonzero if on this machine it is safe to "convert"
1880 an integer of INPREC bits to one of OUTPREC bits (where OUTPREC is smaller
1881 than INPREC) by merely operating on it as if it had only OUTPREC bits. */
1883 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1885 /* A C expression describing the value returned by a comparison operator with
1886 an integral mode and stored by a store-flag instruction (`sCOND') when the
1887 condition is true. */
1889 /* ??? Investigate using STORE_FLAG_VALUE of -1 instead of 1. */
1891 /* An alias for the machine mode for pointers. */
1893 /* ??? This would change if we had ILP32 support. */
1895 #define Pmode DImode
1897 /* An alias for the machine mode used for memory references to functions being
1898 called, in `call' RTL expressions. */
1900 #define FUNCTION_MODE Pmode
1902 /* Define this macro to handle System V style pragmas: #pragma pack and
1903 #pragma weak. Note, #pragma weak will only be supported if SUPPORT_WEAK is
1904 defined. */
1906 #define HANDLE_SYSV_PRAGMA 1
1908 /* A C expression for the maximum number of instructions to execute via
1909 conditional execution instructions instead of a branch. A value of
1910 BRANCH_COST+1 is the default if the machine does not use
1911 cc0, and 1 if it does use cc0. */
1912 /* ??? Investigate. */
1913 #define MAX_CONDITIONAL_EXECUTE 12
1917 #define TARGET_UNWIND_INFO 1
1919 #define TARGET_UNWIND_TABLES_DEFAULT true
1921 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + 15 : INVALID_REGNUM)
1923 /* This function contains machine specific function data. */
1925 {
1926 /* The new stack pointer when unwinding from EH. */
1927 rtx ia64_eh_epilogue_sp;
1929 /* The new bsp value when unwinding from EH. */
1930 rtx ia64_eh_epilogue_bsp;
1932 /* The GP value save register. */
1933 rtx ia64_gp_save;
1935 /* The number of varargs registers to save. */
1938 /* The number of the next unwind state to copy. */
1940 };
1942 #define DONT_USE_BUILTIN_SETJMP
1944 /* Output any profiling code before the prologue. */
1946 #undef PROFILE_BEFORE_PROLOGUE
1947 #define PROFILE_BEFORE_PROLOGUE 1
1949 /* Initialize library function table. */
1950 #undef TARGET_INIT_LIBFUNCS
1951 #define TARGET_INIT_LIBFUNCS ia64_init_libfuncs
1952 \f
1954 /* Switch on code for querying unit reservations. */
1955 #define CPU_UNITS_QUERY 1
1957 /* Define this to change the optimizations performed by default. */
1958 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
1959 ia64_optimization_options ((LEVEL), (SIZE))
1961 /* End of ia64.h */