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1 282 jeremybenn
/* Definitions for GCC.  Part of the machine description for CRIS.
2
   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,
3
   2009 Free Software Foundation, Inc.
4
   Contributed by Axis Communications.  Written by Hans-Peter Nilsson.
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10
the Free Software Foundation; either version 3, or (at your option)
11
any later version.
12
 
13
GCC is distributed in the hope that it will be useful,
14
but WITHOUT ANY WARRANTY; without even the implied warranty of
15
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
GNU General Public License for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
20
<http://www.gnu.org/licenses/>.  */
21
 
22
/* After the first "Node:" comment comes all preprocessor directives and
23
   attached declarations described in the info files, the "Using and
24
   Porting GCC" manual (uapgcc), in the same order as found in the "Target
25
   macros" section in the gcc-2.9x CVS edition of 2000-03-17.  FIXME: Not
26
   really, but needs an update anyway.
27
 
28
   There is no generic copy-of-uapgcc comment, you'll have to see uapgcc
29
   for that.  If applicable, there is a CRIS-specific comment.  The order
30
   of macro definitions follow the order in the manual.  Every section in
31
   the manual (node in the info pages) has an introductory `Node:
32
   <subchapter>' comment.  If no macros are defined for a section, only
33
   the section-comment is present.  */
34
 
35
/* Note that other header files (e.g. config/elfos.h, config/linux.h,
36
   config/cris/linux.h and config/cris/aout.h) are responsible for lots of
37
   settings not repeated below.  This file contains general CRIS
38
   definitions and definitions for the cris-*-elf subtarget.  */
39
 
40
/* We don't want to use gcc_assert for everything, as that can be
41
   compiled out.  */
42
#define CRIS_ASSERT(x) \
43
 do { if (!(x)) internal_error ("CRIS-port assertion failed: " #x); } while (0)
44
 
45
/* Replacement for REG_P since it does not match SUBREGs.  Happens for
46
   testcase Axis-20000320 with gcc-2.9x.  */
47
#define REG_S_P(x) \
48
 (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (XEXP (x, 0))))
49
 
50
/* Last register in main register bank r0..r15.  */
51
#define CRIS_LAST_GENERAL_REGISTER 15
52
 
53
/* Descriptions of registers used for arguments.  */
54
#define CRIS_FIRST_ARG_REG 10
55
#define CRIS_MAX_ARGS_IN_REGS 4
56
 
57
/* See also *_REGNUM constants in cris.md.  */
58
 
59
/* Most of the time, we need the index into the register-names array.
60
   When passing debug-info, we need the real hardware register number.  */
61
#define CRIS_CANONICAL_SRP_REGNUM (16 + 11)
62
#define CRIS_CANONICAL_MOF_REGNUM (16 + 7)
63
/* We have CCR in all models including v10, but that's 16 bits, so let's
64
   prefer the DCCR number, which is a DMA pointer in pre-v8, so we'll
65
   never clash with it for GCC purposes.  */
66
#define CRIS_CANONICAL_CC0_REGNUM (16 + 13)
67
 
68
/* When generating PIC, these suffixes are added to the names of non-local
69
   functions when being output.  Contrary to other ports, we have offsets
70
   relative to the GOT, not the PC.  We might implement PC-relative PLT
71
   semantics later for the general case; they are used in some cases right
72
   now, such as MI thunks.  */
73
#define CRIS_GOTPLT_SUFFIX ":GOTPLT"
74
#define CRIS_PLT_GOTOFFSET_SUFFIX ":PLTG"
75
#define CRIS_PLT_PCOFFSET_SUFFIX ":PLT"
76
 
77
#define CRIS_FUNCTION_ARG_SIZE(MODE, TYPE)      \
78
  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE)     \
79
   : (unsigned) int_size_in_bytes (TYPE))
80
 
81
/* Which CPU version this is.  The parsed and adjusted cris_cpu_str.  */
82
extern int cris_cpu_version;
83
 
84
/* Changing the order used to be necessary to put the fourth __make_dp
85
   argument (a DImode parameter) in registers, to fit with the libfunc
86
   parameter passing scheme used for intrinsic functions.  FIXME: Check
87
   performance and maybe remove definition from TARGET_LIBGCC2_CFLAGS now
88
   that it isn't strictly necessary.  We used to do this through
89
   TARGET_LIBGCC2_CFLAGS, but that became increasingly difficult as the
90
   parenthesis (that needed quoting) travels through several layers of
91
   make and shell invocations.  */
92
#ifdef IN_LIBGCC2
93
#define __make_dp(a,b,c,d) __cris_make_dp(d,a,b,c)
94
#endif
95
 
96
 
97
/* Node: Driver */
98
 
99
/* When using make with defaults.mak for Sun this will handily remove
100
   any "-target sun*" switches.  */
101
/* We need to override any previous definitions (linux.h) */
102
#undef WORD_SWITCH_TAKES_ARG
103
#define WORD_SWITCH_TAKES_ARG(STR)              \
104
 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)           \
105
  || !strcmp (STR, "target"))
106
 
107
/* Also provide canonical vN definitions when user specifies an alias.
108
   Note that -melf overrides -maout.  */
109
 
110
#define CPP_SPEC \
111
 "%{mtune=*:-D__tune_%* %{mtune=v*:-D__CRIS_arch_tune=%*}\
112
   %{mtune=etrax4:-D__tune_v3 -D__CRIS_arch_tune=3}\
113
   %{mtune=etrax100:-D__tune_v8 -D__CRIS_arch_tune=8}\
114
   %{mtune=svinto:-D__tune_v8 -D__CRIS_arch_tune=8}\
115
   %{mtune=etrax100lx:-D__tune_v10 -D__CRIS_arch_tune=10}\
116
   %{mtune=ng:-D__tune_v10 -D__CRIS_arch_tune=10}}\
117
  %{mcpu=*:-D__arch_%* %{mcpu=v*:-D__CRIS_arch_version=%*}\
118
   %{mcpu=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
119
   %{mcpu=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
120
   %{mcpu=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
121
   %{mcpu=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
122
   %{mcpu=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
123
  %{march=*:-D__arch_%* %{march=v*:-D__CRIS_arch_version=%*}\
124
   %{march=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
125
   %{march=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
126
   %{march=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
127
   %{march=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
128
   %{march=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
129
  %{metrax100:-D__arch__v8 -D__CRIS_arch_version=8}\
130
  %{metrax4:-D__arch__v3 -D__CRIS_arch_version=3}\
131
  %(cpp_subtarget)"
132
 
133
/* For the cris-*-elf subtarget.  */
134
 
135
#define CRIS_DEFAULT_TUNE "10"
136
#define CRIS_ARCH_CPP_DEFAULT
137
#define CRIS_DEFAULT_ASM_ARCH_OPTION ""
138
 
139
#ifdef TARGET_CPU_DEFAULT
140
#if TARGET_CPU_DEFAULT != 32 && TARGET_CPU_DEFAULT != 10
141
 #error "Due to '()'; e.g. '#define TARGET_CPU_DEFAULT (10)', stringize TARGET_CPU_DEFAULT isn't useful: update manually."
142
#endif
143
 
144
#if TARGET_CPU_DEFAULT == 32
145
#undef CRIS_DEFAULT_TUNE
146
#define CRIS_DEFAULT_TUNE "32"
147
/* To enable use of "generic" cris-axis-elf binutils, always pass the
148
   architecture option to GAS.  (We don't do this for non-v32.)  */
149
#undef CRIS_DEFAULT_ASM_ARCH_OPTION
150
#define CRIS_DEFAULT_ASM_ARCH_OPTION "--march=v32"
151
#endif
152
 
153
#undef CRIS_ARCH_CPP_DEFAULT
154
#define CRIS_ARCH_CPP_DEFAULT \
155
 "%{!march=*:\
156
   %{!metrax*:\
157
    %{!mcpu=*:\
158
     %{!mtune=*:-D__tune_v" CRIS_DEFAULT_TUNE "}\
159
     -D__arch_v"CRIS_DEFAULT_TUNE\
160
   " -D__CRIS_arch_version=" CRIS_DEFAULT_TUNE "}}}"
161
#endif
162
 
163
#define CRIS_CPP_SUBTARGET_SPEC \
164
 "%{mbest-lib-options:\
165
   %{!moverride-best-lib-options:\
166
   %{!march=*:%{!metrax*:%{!mcpu=*:\
167
      -D__tune_v" CRIS_DEFAULT_TUNE \
168
    " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}}}}"\
169
 CRIS_ARCH_CPP_DEFAULT
170
 
171
/* Remove those Sun-make "target" switches.  */
172
/* Override previous definitions (linux.h).  */
173
#undef CC1_SPEC
174
#define CC1_SPEC \
175
 "%{target*:}\
176
  %{metrax4:-march=v3}\
177
  %{metrax100:-march=v8}\
178
  %(cc1_subtarget)"
179
 
180
/* For the cris-*-elf subtarget.  */
181
#define CRIS_CC1_SUBTARGET_SPEC \
182
 "-melf\
183
  %{mbest-lib-options:\
184
   %{!moverride-best-lib-options:\
185
   %{!march=*:%{!mcpu=*:-mtune=v" CRIS_DEFAULT_TUNE\
186
       " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}\
187
    %{!finhibit-size-directive:\
188
      %{!fno-function-sections: -ffunction-sections}\
189
      %{!fno-data-sections: -fdata-sections}}}}"
190
 
191
/* This adds to CC1_SPEC.  */
192
#define CC1PLUS_SPEC ""
193
 
194
#ifdef HAVE_AS_NO_MUL_BUG_ABORT_OPTION
195
#define MAYBE_AS_NO_MUL_BUG_ABORT \
196
 "%{mno-mul-bug-workaround:-no-mul-bug-abort} "
197
#else
198
#define MAYBE_AS_NO_MUL_BUG_ABORT
199
#endif
200
 
201
/* Override previous definitions (linux.h).  */
202
#undef ASM_SPEC
203
#define ASM_SPEC \
204
 MAYBE_AS_NO_MUL_BUG_ABORT \
205
 "%{v:-v}\
206
 %(asm_subtarget)\
207
 %{march=*:%{cpu=*:%eDo not specify both -march=... and -mcpu=...}}\
208
 %{march=v32:--march=v32} %{mcpu=v32:--march=v32}"
209
 
210
/* For the cris-*-elf subtarget.  */
211
#define CRIS_ASM_SUBTARGET_SPEC \
212
 "--em=criself %{!march=*:%{!cpu=*:" CRIS_DEFAULT_ASM_ARCH_OPTION "}}"
213
 
214
/* FIXME: We should propagate the -melf option to make the criself
215
   "emulation" unless a linker script is provided (-T*), but I don't know
216
   how to do that if either of -Ttext, -Tdata or -Tbss is given but no
217
   linker script, as is usually the case.  Leave it to the user for the
218
   time being.
219
 
220
   Note that -melf overrides -maout except that a.out-compiled libraries
221
   are linked in (multilibbing).  The somewhat cryptic -rpath-link pair is
222
   to avoid *only* picking up the linux multilib subdir from the "-B./"
223
   option during build, while still giving it preference.  We'd need some
224
   %s-variant that checked for existence of some specific file.  */
225
/* Override previous definitions (svr4.h).  */
226
#undef LINK_SPEC
227
#define LINK_SPEC \
228
 "%{v:--verbose}\
229
  %(link_subtarget)"
230
 
231
/* For the cris-*-elf subtarget.  */
232
#define CRIS_LINK_SUBTARGET_SPEC \
233
 "-mcriself\
234
  %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
235
  %{!r:%{O2|O3: --gc-sections}}"
236
 
237
/* Which library to get.  The simulator uses a different library for
238
   the low-level syscalls (implementing the Linux syscall ABI instead
239
   of direct-iron accesses).  Default everything with the stub "nosys"
240
   library.  */
241
/* Override previous definitions (linux.h).  */
242
#undef LIB_SPEC
243
#define LIB_SPEC \
244
 "%{sim*:--start-group -lc -lsyslinux --end-group}\
245
  %{!sim*:%{g*:-lg}\
246
    %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
247
  -lnosys"
248
 
249
/* Linker startfile options; crt0 flavors.
250
   We need to remove any previous definition (elfos.h).  */
251
#undef STARTFILE_SPEC
252
#define STARTFILE_SPEC \
253
 "%{sim*:crt1.o%s}%{!sim*:crt0.o%s}\
254
  crti.o%s crtbegin.o%s"
255
 
256
#undef ENDFILE_SPEC
257
#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
258
 
259
#define EXTRA_SPECS                             \
260
  {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC},   \
261
  {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC},   \
262
  {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC},   \
263
  {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
264
  CRIS_SUBTARGET_EXTRA_SPECS
265
 
266
#define CRIS_SUBTARGET_EXTRA_SPECS
267
 
268
 
269
/* Node: Run-time Target */
270
 
271
#define TARGET_CPU_CPP_BUILTINS()               \
272
  do                                            \
273
    {                                           \
274
      builtin_define_std ("cris");              \
275
      builtin_define_std ("CRIS");              \
276
      builtin_define_std ("GNU_CRIS");          \
277
      builtin_define ("__CRIS_ABI_version=2");  \
278
      builtin_assert ("cpu=cris");              \
279
      builtin_assert ("machine=cris");          \
280
    }                                           \
281
  while (0)
282
 
283
/* This needs to be at least 32 bits.  */
284
extern int target_flags;
285
 
286
/* Previously controlled by target_flags.  */
287
#define TARGET_ELF 1
288
 
289
/* Previously controlled by target_flags.  Note that this is *not* set
290
   for -melinux.  */
291
#define TARGET_LINUX 0
292
 
293
/* For the cris-*-elf subtarget.  */
294
#define CRIS_SUBTARGET_DEFAULT 0
295
 
296
#define CRIS_CPU_BASE 0
297
#define CRIS_CPU_ETRAX4 3       /* Just lz added.  */
298
#define CRIS_CPU_SVINTO 8       /* Added swap, jsrc & Co., 32-bit accesses.  */
299
#define CRIS_CPU_NG 10          /* Added mul[su].  */
300
#define CRIS_CPU_V32 32         /* Major changes.  */
301
 
302
#ifndef TARGET_CPU_DEFAULT
303
#define TARGET_CPU_DEFAULT CRIS_CPU_BASE
304
#endif
305
 
306
/* Default target_flags if no switches specified.  */
307
#ifndef TARGET_DEFAULT
308
# if TARGET_CPU_DEFAULT == 32
309
#  define TARGET_DEFAULT \
310
 (MASK_STACK_ALIGN \
311
  + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
312
  + MASK_PROLOGUE_EPILOGUE)
313
# else  /* 10 */
314
# define TARGET_DEFAULT \
315
 (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
316
  + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
317
  + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
318
# endif
319
#endif
320
 
321
/* Local, providing a default for cris_cpu_version.  */
322
#define CRIS_DEFAULT_CPU_VERSION TARGET_CPU_DEFAULT
323
 
324
#define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
325
#define TARGET_HAS_LZ (cris_cpu_version >= CRIS_CPU_ETRAX4)
326
#define TARGET_HAS_SWAP (cris_cpu_version >= CRIS_CPU_SVINTO)
327
#define TARGET_V32 (cris_cpu_version >= CRIS_CPU_V32)
328
 
329
#define CRIS_SUBTARGET_HANDLE_OPTION(x, y, z)
330
 
331
#define OVERRIDE_OPTIONS cris_override_options ()
332
 
333
#define OPTIMIZATION_OPTIONS(OPTIMIZE, SIZE)    \
334
  do                                            \
335
    {                                           \
336
      if ((OPTIMIZE) >= 2 || (SIZE))            \
337
        flag_omit_frame_pointer = 1;            \
338
    }                                           \
339
  while (0)
340
 
341
 
342
/* Node: Storage Layout */
343
 
344
#define BITS_BIG_ENDIAN 0
345
 
346
#define BYTES_BIG_ENDIAN 0
347
 
348
/* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
349
   we use little-endianness, and we may also be able to use
350
   post-increment on DImode indirect.  */
351
#define WORDS_BIG_ENDIAN 0
352
 
353
#define UNITS_PER_WORD 4
354
 
355
#define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
356
 (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
357
  ? SImode : MODE
358
 
359
/* We will be using prototype promotion, so they will be 32 bit.  */
360
#define PARM_BOUNDARY 32
361
 
362
/* Stack boundary is guided by -mstack-align, -mno-stack-align,
363
   -malign.
364
   Old comment: (2.1: still valid in 2.7.2?)
365
    Note that to make this macro affect the alignment of stack
366
   locals, a fix was required, and special precautions when handling
367
   the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
368
   et al) were required.  See file "function.c".  If you would just define
369
   this macro, it would only affect the builtin alloca and variable
370
   local data (non-ANSI, non-K&R, Gnu C extension).  */
371
#define STACK_BOUNDARY \
372
 (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
373
 
374
#define FUNCTION_BOUNDARY 16
375
 
376
/* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
377
   strange places, at least in 2.1.  */
378
#define BIGGEST_ALIGNMENT 8
379
 
380
/* If -m16bit,  -m16-bit, -malign or -mdata-align,
381
   align everything to 16 bit.  */
382
#define DATA_ALIGNMENT(TYPE, BASIC_ALIGN)                       \
383
 (TARGET_DATA_ALIGN                                             \
384
  ? (TARGET_ALIGN_BY_32                                         \
385
     ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
386
     : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
387
 
388
/* Note that CONSTANT_ALIGNMENT has the effect of making gcc believe that
389
   ALL references to constant stuff (in code segment, like strings) has
390
   this alignment.  That is a rather rushed assumption.  Luckily we do not
391
   care about the "alignment" operand to builtin memcpy (only place where
392
   it counts), so it doesn't affect any bad spots.  */
393
#define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN)               \
394
 (TARGET_CONST_ALIGN                                            \
395
  ? (TARGET_ALIGN_BY_32                                         \
396
     ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
397
     : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
398
 
399
/* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
400
   structures (if -mstack-align=), and check that it is good.  */
401
 
402
#define EMPTY_FIELD_BOUNDARY 8
403
 
404
#define STRUCTURE_SIZE_BOUNDARY 8
405
 
406
#define STRICT_ALIGNMENT 0
407
 
408
/* Remove any previous definition (elfos.h).
409
   ??? If it wasn't for all the other stuff that affects layout of
410
   structures and bit-fields, this could presumably cause incompatibility
411
   with other GNU/Linux ports (i.e. elfos.h users).  */
412
#undef PCC_BITFIELD_TYPE_MATTERS
413
 
414
/* This is only used for non-scalars.  Strange stuff happens to structs
415
   (FIXME: What?) if we use anything larger than largest actually used
416
   datum size, so lets make it 32.  The type "long long" will still work
417
   as usual.  We can still have DImode insns, but they will only be used
418
   for scalar data (i.e. long long).  */
419
#define MAX_FIXED_MODE_SIZE 32
420
 
421
 
422
/* Node: Type Layout */
423
 
424
/* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
425
   value gives a 64-bit double, which is what we now use.  */
426
 
427
/* For compatibility and historical reasons, a char should be signed.  */
428
#define DEFAULT_SIGNED_CHAR 1
429
 
430
/* Note that WCHAR_TYPE_SIZE is used in cexp.y,
431
   where TARGET_SHORT is not available.  */
432
#undef WCHAR_TYPE
433
#define WCHAR_TYPE "long int"
434
 
435
#undef WCHAR_TYPE_SIZE
436
#define WCHAR_TYPE_SIZE 32
437
 
438
 
439
/* Node: Register Basics */
440
 
441
/*  We count all 16 non-special registers, SRP, a faked argument
442
    pointer register, MOF and CCR/DCCR.  */
443
#define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1)
444
 
445
/* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
446
   frame-pointer, but is not fixed.  SRP is not included in general
447
   registers and will not be used automatically.  All other special
448
   registers are fixed at the moment.  The faked argument pointer register
449
   is fixed too.  */
450
#define FIXED_REGISTERS \
451
 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0}
452
 
453
/* Register r9 is used for structure-address, r10-r13 for parameters,
454
   r10- for return values.  */
455
#define CALL_USED_REGISTERS \
456
 {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1}
457
 
458
#define CONDITIONAL_REGISTER_USAGE cris_conditional_register_usage ()
459
 
460
 
461
/* Node: Allocation Order */
462
 
463
/* We need this on CRIS, because call-used regs should be used first,
464
   (so we don't need to push).  Else start using registers from r0 and up.
465
    This preference is mainly because if we put call-used-regs from r0
466
   and up, then we can't use movem to push the rest, (which have to be
467
   saved if we use them, and movem has to start with r0).
468
   Change here if you change which registers to use as call registers.
469
 
470
   The actual need to explicitly prefer call-used registers improved the
471
   situation a lot for 2.1, but might not actually be needed anymore.
472
   Still, this order reflects what GCC should find out by itself, so it
473
   probably does not hurt.
474
 
475
   Order of preference: Call-used-regs first, then r0 and up, last fp &
476
   sp & pc as fillers.
477
   Call-used regs in opposite order, so they will cause less conflict if
478
   a function has few args (<= 3) and it wants a scratch reg.
479
    Use struct-return address first, since very few functions use
480
   structure return values so it is likely to be available.  */
481
#define REG_ALLOC_ORDER \
482
 {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19}
483
 
484
/* Use MOF and ACR.  Prefer ACR before any other register.  Prefer MOF
485
   then SRP after saved registers.  The *after* is because they're only
486
   useful for storage, not for things being computed, which is
487
   apparently more common.  */
488
#define REG_ALLOC_ORDER_V32 \
489
 {15, 9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 17, 16, 14, 18, 19}
490
 
491
 
492
/* Node: Values in Registers */
493
 
494
/* The VOIDmode test is so we can omit mode on anonymous insns.  FIXME:
495
   Still needed in 2.9x, at least for Axis-20000319.  */
496
#define HARD_REGNO_NREGS(REGNO, MODE)   \
497
 (MODE == VOIDmode \
498
  ? 1 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
499
 
500
/* CRIS permits all registers to hold all modes.  Well, except for the
501
   condition-code register.  And we can't hold larger-than-register size
502
   modes in the last special register that can hold a full 32 bits.  */
503
#define HARD_REGNO_MODE_OK(REGNO, MODE)         \
504
 (((MODE) == CCmode                             \
505
   || (REGNO) != CRIS_CC0_REGNUM)               \
506
  && (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD    \
507
      || ((REGNO) != CRIS_MOF_REGNUM && (REGNO) != CRIS_ACR_REGNUM)))
508
 
509
/* Because CCmode isn't covered by the "narrower mode" statement in
510
   tm.texi, we can still say all modes are tieable despite not having an
511
   always 1 HARD_REGNO_MODE_OK.  */
512
#define MODES_TIEABLE_P(MODE1, MODE2) 1
513
 
514
 
515
/* Node: Leaf Functions */
516
/* (no definitions) */
517
 
518
/* Node: Stack Registers */
519
/* (no definitions) */
520
 
521
 
522
/* Node: Register Classes */
523
 
524
/* FIXME: A separate class for the return register would make sense.
525
 
526
   We need a separate register class to handle register allocation for
527
   ACR, since it can't be used for post-increment.
528
 
529
   It's not obvious, but having subunions of all movable-between
530
   register classes does really help register allocation.  */
531
enum reg_class
532
  {
533
    NO_REGS,
534
    ACR_REGS, MOF_REGS, CC0_REGS, SPECIAL_REGS,
535
    SPEC_ACR_REGS, GENNONACR_REGS,
536
    SPEC_GENNONACR_REGS, GENERAL_REGS,
537
    ALL_REGS,
538
    LIM_REG_CLASSES
539
  };
540
 
541
#define N_REG_CLASSES (int) LIM_REG_CLASSES
542
 
543
#define REG_CLASS_NAMES                                         \
544
  {"NO_REGS",                                                   \
545
   "ACR_REGS", "MOF_REGS", "CC0_REGS", "SPECIAL_REGS",          \
546
   "SPEC_ACR_REGS", "GENNONACR_REGS", "SPEC_GENNONACR_REGS",    \
547
   "GENERAL_REGS", "ALL_REGS"}
548
 
549
#define CRIS_SPECIAL_REGS_CONTENTS                                      \
550
 ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
551
 
552
/* Count in the faked argument register in GENERAL_REGS.  Keep out SRP.  */
553
#define REG_CLASS_CONTENTS                      \
554
  {                                             \
555
   {0},                                          \
556
   {1 << CRIS_ACR_REGNUM},                      \
557
   {1 << CRIS_MOF_REGNUM},                      \
558
   {1 << CRIS_CC0_REGNUM},                      \
559
   {CRIS_SPECIAL_REGS_CONTENTS},                \
560
   {CRIS_SPECIAL_REGS_CONTENTS                  \
561
    | (1 << CRIS_ACR_REGNUM)},                  \
562
   {(0xffff | (1 << CRIS_AP_REGNUM))            \
563
    & ~(1 << CRIS_ACR_REGNUM)},                 \
564
   {(0xffff | (1 << CRIS_AP_REGNUM)             \
565
    | CRIS_SPECIAL_REGS_CONTENTS)               \
566
    & ~(1 << CRIS_ACR_REGNUM)},                 \
567
   {0xffff | (1 << CRIS_AP_REGNUM)},            \
568
   {0xffff | (1 << CRIS_AP_REGNUM)              \
569
    | CRIS_SPECIAL_REGS_CONTENTS}               \
570
  }
571
 
572
#define REGNO_REG_CLASS(REGNO)                  \
573
  ((REGNO) == CRIS_ACR_REGNUM ? ACR_REGS :      \
574
   (REGNO) == CRIS_MOF_REGNUM ? MOF_REGS :      \
575
   (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS :      \
576
   (REGNO) == CRIS_SRP_REGNUM ? SPECIAL_REGS :  \
577
   GENERAL_REGS)
578
 
579
#define BASE_REG_CLASS GENERAL_REGS
580
 
581
#define MODE_CODE_BASE_REG_CLASS(MODE, OCODE, ICODE)    \
582
  ((OCODE) != POST_INC ? BASE_REG_CLASS : GENNONACR_REGS)
583
 
584
#define INDEX_REG_CLASS GENERAL_REGS
585
 
586
#define IRA_COVER_CLASSES { GENERAL_REGS, SPECIAL_REGS, LIM_REG_CLASSES }
587
 
588
#define REG_CLASS_FROM_LETTER(C)                \
589
  (                                             \
590
   (C) == 'a' ? ACR_REGS :                      \
591
   (C) == 'b' ? GENNONACR_REGS :                \
592
   (C) == 'h' ? MOF_REGS :                      \
593
   (C) == 'x' ? SPECIAL_REGS :                  \
594
   (C) == 'c' ? CC0_REGS :                      \
595
   NO_REGS                                      \
596
  )
597
 
598
/* Since it uses reg_renumber, it is safe only once reg_renumber
599
   has been allocated, which happens in local-alloc.c.  */
600
#define REGNO_OK_FOR_BASE_P(REGNO)                                      \
601
 ((REGNO) <= CRIS_LAST_GENERAL_REGISTER                                 \
602
  || (REGNO) == ARG_POINTER_REGNUM                                      \
603
  || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER       \
604
  || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
605
 
606
/* REGNO_OK_FOR_BASE_P seems to be obsolete wrt. this one, but not yet
607
   documented as such.  */
608
#define REGNO_MODE_CODE_OK_FOR_BASE_P(REGNO, MODE, OCODE, ICODE)        \
609
 (REGNO_OK_FOR_BASE_P (REGNO)                                           \
610
  && ((OCODE) != POST_INC                                               \
611
      || !((REGNO) == CRIS_ACR_REGNUM                                   \
612
           || (unsigned) reg_renumber[REGNO] == CRIS_ACR_REGNUM)))
613
 
614
/* See REGNO_OK_FOR_BASE_P.  */
615
#define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
616
 
617
/* It seems like gcc (2.7.2 and 2.9x of 2000-03-22) may send "NO_REGS" as
618
   the class for a constant (testcase: __Mul in arit.c).  To avoid forcing
619
   out a constant into the constant pool, we will trap this case and
620
   return something a bit more sane.  FIXME: Check if this is a bug.
621
   Beware that we must not "override" classes that can be specified as
622
   constraint letters, or else asm operands using them will fail when
623
   they need to be reloaded.  FIXME: Investigate whether that constitutes
624
   a bug.  */
625
#define PREFERRED_RELOAD_CLASS(X, CLASS)        \
626
 ((CLASS) != ACR_REGS                           \
627
  && (CLASS) != MOF_REGS                        \
628
  && (CLASS) != CC0_REGS                        \
629
  && (CLASS) != SPECIAL_REGS                    \
630
  ? GENERAL_REGS : (CLASS))
631
 
632
/* We can't move special registers to and from memory in smaller than
633
   word_mode.  We also can't move between special registers.  Luckily,
634
   -1, as returned by true_regnum for non-sub/registers, is valid as a
635
   parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
636
   the effect that any X that isn't a special-register is treated as
637
   a non-empty intersection with GENERAL_REGS.  */
638
#define SECONDARY_RELOAD_CLASS(CLASS, MODE, X)                          \
639
 ((((CLASS) == SPECIAL_REGS || (CLASS) == MOF_REGS)                     \
640
   && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X))                          \
641
       || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)),  \
642
                                    GENERAL_REGS)))                     \
643
   ? GENERAL_REGS : NO_REGS)
644
 
645
/* FIXME: Fix regrename.c; it should check validity of replacements,
646
   not just with a silly pass-specific macro.  We may miss some
647
   opportunities, but we must stop regrename from creating acr++.  */
648
#define HARD_REGNO_RENAME_OK(FROM, TO) ((TO) != CRIS_ACR_REGNUM)
649
 
650
/* For CRIS, this is always the size of MODE in words,
651
   since all registers are the same size.  To use omitted modes in
652
   patterns with reload constraints, you must say the widest size
653
   which is allowed for VOIDmode.
654
   FIXME:  Does that still apply for gcc-2.9x?  Keep poisoned until such
655
   patterns are added back.  News: 2001-03-16: Happens as early as the
656
   underscore-test.  */
657
#define CLASS_MAX_NREGS(CLASS, MODE)                                    \
658
 ((MODE) == VOIDmode                                                    \
659
  ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */              \
660
  : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
661
 
662
/* We are now out of letters; we could use ten more.  This forces us to
663
   use C-code in the 'md' file.  FIXME: Use some EXTRA_CONSTRAINTS.  */
664
#define CRIS_CONST_OK_FOR_LETTER_P(VALUE, C)            \
665
 (                                                      \
666
  /* MOVEQ, CMPQ, ANDQ, ORQ.  */                        \
667
  (C) == 'I' ? (VALUE) >= -32 && (VALUE) <= 31 :        \
668
  /* ADDQ, SUBQ.  */                                    \
669
  (C) == 'J' ? (VALUE) >= 0 && (VALUE) <= 63 :           \
670
  /* ASRQ, BTSTQ, LSRQ, LSLQ.  */                       \
671
  (C) == 'K' ? (VALUE) >= 0 && (VALUE) <= 31 :           \
672
  /* A 16-bit signed number.  */                        \
673
  (C) == 'L' ? (VALUE) >= -32768 && (VALUE) <= 32767 :  \
674
  /* The constant 0 for CLEAR.  */                      \
675
  (C) == 'M' ? (VALUE) == 0 :                            \
676
  /* A negative ADDQ or SUBQ.  */                       \
677
  (C) == 'N' ? (VALUE) >= -63 && (VALUE) < 0 :           \
678
  /* Quickened ints, QI and HI.  */                     \
679
  (C) == 'O' ? (VALUE) >= 0 && (VALUE) <= 65535          \
680
                && ((VALUE) >= (65535-31)               \
681
                    || ((VALUE) >= (255-31)             \
682
                        && (VALUE) <= 255 )) :          \
683
  /* A 16-bit number signed *or* unsigned.  */          \
684
  (C) == 'P' ? (VALUE) >= -32768 && (VALUE) <= 65535 :  \
685
  0)
686
 
687
#define CONST_OK_FOR_CONSTRAINT_P(VALUE, C, S)  \
688
 (                                              \
689
  ((C) != 'K' || (S)[1] == 'c')                 \
690
   ? CRIS_CONST_OK_FOR_LETTER_P (VALUE, C) :    \
691
  ((C) == 'K' && (S)[1] == 'p')                 \
692
   ? exact_log2 (VALUE) >= 0 :                   \
693
  0)
694
 
695
#define CONSTRAINT_LEN(C, S) ((C) == 'K' ? 2 : DEFAULT_CONSTRAINT_LEN (C, S))
696
 
697
/* It is really simple to make up a 0.0; it is the same as int-0 in
698
   IEEE754.  */
699
#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
700
 ((C) == 'G' && ((VALUE) == CONST0_RTX (DFmode)                 \
701
                 || (VALUE) == CONST0_RTX (SFmode)))
702
 
703
/* We need this on cris to distinguish delay-slottable addressing modes.  */
704
#define EXTRA_CONSTRAINT(X, C)                  \
705
 (                                              \
706
  /* Slottable address mode?  */                \
707
  (C) == 'Q' ? EXTRA_CONSTRAINT_Q (X) :         \
708
  /* Operand to BDAP or BIAP?  */               \
709
  (C) == 'R' ? EXTRA_CONSTRAINT_R (X) :         \
710
  /* A local PIC symbol?  */                    \
711
  (C) == 'S' ? EXTRA_CONSTRAINT_S (X) :         \
712
  /* A three-address addressing-mode?  */       \
713
  (C) == 'T' ? EXTRA_CONSTRAINT_T (X) :         \
714
  /* A PLT symbol?  */                          \
715
  (C) == 'U' ? EXTRA_CONSTRAINT_U (X) :         \
716
  0)
717
 
718
#define EXTRA_MEMORY_CONSTRAINT(X, STR) ((X) == 'Q')
719
 
720
#define EXTRA_CONSTRAINT_Q(X)                           \
721
 (                                                      \
722
  /* Just an indirect register (happens to also be      \
723
     "all" slottable memory addressing modes not        \
724
     covered by other constraints, i.e. '>').  */       \
725
  MEM_P (X) && BASE_P (XEXP (X, 0))                      \
726
 )
727
 
728
#define EXTRA_CONSTRAINT_R(X)                                   \
729
 (                                                              \
730
  /* An operand to BDAP or BIAP:                                \
731
     A BIAP; r.S? */                                            \
732
  BIAP_INDEX_P (X)                                              \
733
  /* A [reg] or (int) [reg], maybe with post-increment.  */     \
734
  || BDAP_INDEX_P (X)                                           \
735
  || CONSTANT_INDEX_P (X)                                       \
736
 )
737
 
738
#define EXTRA_CONSTRAINT_T(X)                                           \
739
 (                                                                      \
740
  /* Memory three-address operand.  All are indirect-memory:  */        \
741
  MEM_P (X)                                                             \
742
  && ((MEM_P (XEXP (X, 0))                                               \
743
       /* Double indirect: [[reg]] or [[reg+]]?  */                     \
744
       && (BASE_OR_AUTOINCR_P (XEXP (XEXP (X, 0), 0))))                   \
745
      /* Just an explicit indirect reference: [const]?  */              \
746
      || CONSTANT_P (XEXP (X, 0))                                        \
747
      /* Something that is indexed; [...+...]?  */                      \
748
      || (GET_CODE (XEXP (X, 0)) == PLUS                         \
749
          /* A BDAP constant: [reg+(8|16|32)bit offset]?  */            \
750
          && ((BASE_P (XEXP (XEXP (X, 0), 0))                             \
751
               && CONSTANT_INDEX_P (XEXP (XEXP (X, 0), 1)))              \
752
              /* A BDAP register: [reg+[reg(+)].S]?  */                 \
753
              || (BASE_P (XEXP (XEXP (X, 0), 0))                  \
754
                  && BDAP_INDEX_P(XEXP(XEXP(X, 0), 1)))                  \
755
              /* Same, but with swapped arguments (no canonical         \
756
                 ordering between e.g. REG and MEM as of LAST_UPDATED   \
757
                 "Thu May 12 03:59:11 UTC 2005").  */                   \
758
              || (BASE_P (XEXP (XEXP (X, 0), 1))                 \
759
                  && BDAP_INDEX_P (XEXP (XEXP (X, 0), 0)))                \
760
              /* A BIAP: [reg+reg.S] (MULT comes first).  */            \
761
              || (BASE_P (XEXP (XEXP (X, 0), 1))                 \
762
                  && BIAP_INDEX_P (XEXP (XEXP (X, 0), 0))))))             \
763
 )
764
 
765
/* PIC-constructs for symbols.  */
766
#define EXTRA_CONSTRAINT_S(X)                                           \
767
 (flag_pic && GET_CODE (X) == CONST && cris_valid_pic_const (X, false))
768
 
769
#define EXTRA_CONSTRAINT_U(X)                                           \
770
 (flag_pic                                                              \
771
  && CONSTANT_P (X)                                                     \
772
  && cris_nonmemory_operand_or_callable_symbol (X, VOIDmode))
773
 
774
 
775
/* Node: Frame Layout */
776
 
777
#define STACK_GROWS_DOWNWARD
778
#define FRAME_GROWS_DOWNWARD 1
779
 
780
/* It seems to be indicated in the code (at least 2.1) that this is
781
   better a constant, and best 0.  */
782
#define STARTING_FRAME_OFFSET 0
783
 
784
#define FIRST_PARM_OFFSET(FNDECL) 0
785
 
786
#define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
787
 cris_return_addr_rtx (COUNT, FRAMEADDR)
788
 
789
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
790
 
791
/* FIXME: Any __builtin_eh_return callers must not return anything and
792
   there must not be collisions with incoming parameters.  Luckily the
793
   number of __builtin_eh_return callers is limited.  For now return
794
   parameter registers in reverse order and hope for the best.  */
795
#define EH_RETURN_DATA_REGNO(N) \
796
  (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
797
 
798
/* Store the stack adjustment in the structure-return-address register.  */
799
#define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
800
#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
801
 
802
#define EH_RETURN_HANDLER_RTX \
803
  cris_return_addr_rtx (0, NULL)
804
 
805
#define INIT_EXPANDERS cris_init_expanders ()
806
 
807
/* FIXME: Move this to right node (it's not documented properly yet).  */
808
#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
809
 
810
/* FIXME: Move this to right node (it's not documented properly yet).
811
   FIXME: Check what alignment we can assume regarding
812
   TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32.  */
813
#define DWARF_CIE_DATA_ALIGNMENT -1
814
 
815
/* If we would ever need an exact mapping between canonical register
816
   number and dwarf frame register, we would either need to include all
817
   registers in the gcc description (with some marked fixed of course), or
818
   an inverse mapping from dwarf register to gcc register.  There is one
819
   need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes.  Right now, I
820
   don't see that we need exact correspondence between DWARF *frame*
821
   registers and DBX_REGISTER_NUMBER, so map them onto GCC registers.  */
822
#define DWARF_FRAME_REGNUM(REG) (REG)
823
 
824
/* Node: Stack Checking */
825
/* (no definitions) FIXME: Check.  */
826
 
827
/* Node: Frame Registers */
828
 
829
#define STACK_POINTER_REGNUM CRIS_SP_REGNUM
830
 
831
/* Register used for frame pointer.  This is also the last of the saved
832
   registers, when a frame pointer is not used.  */
833
#define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
834
 
835
/* Faked register, is always eliminated.  We need it to eliminate
836
   allocating stack slots for the return address and the frame pointer.  */
837
#define ARG_POINTER_REGNUM CRIS_AP_REGNUM
838
 
839
#define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
840
 
841
 
842
/* Node: Elimination */
843
 
844
#define ELIMINABLE_REGS                         \
845
 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
846
  {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
847
  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
848
 
849
#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
850
 (OFFSET) = cris_initial_elimination_offset (FROM, TO)
851
 
852
 
853
/* Node: Stack Arguments */
854
 
855
/* Since many parameters take up one register each in any case,
856
   defining TARGET_PROMOTE_PROTOTYPES that always returns true would
857
   seem like a good idea, but measurements indicate that a combination
858
   using PROMOTE_MODE is better.  */
859
 
860
#define ACCUMULATE_OUTGOING_ARGS 1
861
 
862
#define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
863
 
864
 
865
/* Node: Register Arguments */
866
 
867
/* The void_type_node is sent as a "closing" call.  */
868
#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)                    \
869
 ((CUM).regs < CRIS_MAX_ARGS_IN_REGS                            \
870
  ? gen_rtx_REG (MODE, (CRIS_FIRST_ARG_REG) + (CUM).regs)       \
871
  : NULL_RTX)
872
 
873
/* The differences between this and the previous, is that this one checks
874
   that an argument is named, since incoming stdarg/varargs arguments are
875
   pushed onto the stack, and we don't have to check against the "closing"
876
   void_type_node TYPE parameter.  */
877
#define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)           \
878
 ((NAMED) && (CUM).regs < CRIS_MAX_ARGS_IN_REGS                 \
879
  ? gen_rtx_REG (MODE, CRIS_FIRST_ARG_REG + (CUM).regs)         \
880
  : NULL_RTX)
881
 
882
/* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
883
   seems like a (small total) loss, at least for gcc-2.7.2 compiling and
884
   running gcc-2.1 (small win in size, small loss running -- 100.1%),
885
   and similarly for size for products (.1 .. .3% bloat, sometimes win).
886
   Due to the empirical likeliness of making slower code, it is not
887
   defined.  */
888
 
889
/* This no longer *needs* to be a structure; but keeping it as such should
890
   not hurt (and hacking the ABI is simpler).  */
891
#define CUMULATIVE_ARGS struct cum_args
892
struct cum_args {int regs;};
893
 
894
/* The regs member is an integer, the number of arguments got into
895
   registers so far.  */
896
#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
897
 ((CUM).regs = 0)
898
 
899
#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
900
 ((CUM).regs += (3 + CRIS_FUNCTION_ARG_SIZE (MODE, TYPE)) / 4)
901
 
902
#define FUNCTION_ARG_REGNO_P(REGNO)                     \
903
 ((REGNO) >= CRIS_FIRST_ARG_REG                         \
904
  && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
905
 
906
 
907
/* Node: Scalar Return */
908
 
909
#define FUNCTION_VALUE_REGNO_P(N) cris_function_value_regno_p (N)
910
 
911
 
912
 
913
/* Node: Aggregate Return */
914
 
915
#define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
916
 
917
 
918
/* Node: Caller Saves */
919
/* (no definitions) */
920
 
921
/* Node: Function entry */
922
 
923
/* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
924
   TARGET_ASM_FUNCTION_EPILOGUE.  */
925
 
926
/* Node: Profiling */
927
 
928
#define FUNCTION_PROFILER(FILE, LABELNO)  \
929
 error ("no FUNCTION_PROFILER for CRIS")
930
 
931
/* FIXME: Some of the undefined macros might be mandatory.  If so, fix
932
   documentation.  */
933
 
934
 
935
/* Node: Trampolines */
936
 
937
#define TRAMPOLINE_SIZE (TARGET_V32 ? 58 : 32)
938
 
939
/* CRIS wants instructions on word-boundary.  */
940
#define TRAMPOLINE_ALIGNMENT 16
941
 
942
/* Node: Library Calls */
943
 
944
/* If you change this, you have to check whatever libraries and systems
945
   that use it.  */
946
#define TARGET_EDOM 33
947
 
948
 
949
/* Node: Addressing Modes */
950
 
951
#define HAVE_POST_INCREMENT 1
952
 
953
/* Must be a compile-time constant, so we go with the highest value
954
   among all CRIS variants.  */
955
#define MAX_REGS_PER_ADDRESS 2
956
 
957
/* There are helper macros defined here which are used only in
958
   GO_IF_LEGITIMATE_ADDRESS.
959
 
960
   Note that you *have to* reject invalid addressing modes for mode
961
   MODE, even if it is legal for normal addressing modes.  You cannot
962
   rely on the constraints to do this work.  They can only be used to
963
   doublecheck your intentions.  One example is that you HAVE TO reject
964
   (mem:DI (plus:SI (reg:SI x) (reg:SI y))) because for some reason
965
   this cannot be reloaded.  (Which of course you can argue that gcc
966
   should have done.)  FIXME:  Strange.  Check.  */
967
 
968
/* No symbol can be used as an index (or more correct, as a base) together
969
   with a register with PIC; the PIC register must be there.  */
970
#define CONSTANT_INDEX_P(X) \
971
 (CONSTANT_P (X) && (!flag_pic || cris_valid_pic_const (X, true)))
972
 
973
/* True if X is a valid base register.  */
974
#define BASE_P(X) \
975
 (REG_P (X) && REG_OK_FOR_BASE_P (X))
976
 
977
/* True if X is a valid base register with or without autoincrement.  */
978
#define BASE_OR_AUTOINCR_P(X)                           \
979
 (BASE_P (X)                                            \
980
  || (GET_CODE (X) == POST_INC                          \
981
      && BASE_P (XEXP (X, 0))                            \
982
      && REGNO (XEXP (X, 0)) != CRIS_ACR_REGNUM))
983
 
984
/* True if X is a valid (register) index for BDAP, i.e. [Rs].S or [Rs+].S.  */
985
#define BDAP_INDEX_P(X)                                 \
986
 ((MEM_P (X) && GET_MODE (X) == SImode                  \
987
   && BASE_OR_AUTOINCR_P (XEXP (X, 0)))                  \
988
  || (GET_CODE (X) == SIGN_EXTEND                       \
989
      && MEM_P (XEXP (X, 0))                             \
990
      && (GET_MODE (XEXP (X, 0)) == HImode               \
991
          || GET_MODE (XEXP (X, 0)) == QImode)           \
992
      && BASE_OR_AUTOINCR_P (XEXP (XEXP (X, 0), 0))))
993
 
994
/* True if X is a valid (register) index for BIAP, i.e. Rd.m.  */
995
#define BIAP_INDEX_P(X)                         \
996
 ((BASE_P (X) && REG_OK_FOR_INDEX_P (X))        \
997
  || (GET_CODE (X) == MULT                      \
998
      && BASE_P (XEXP (X, 0))                    \
999
      && REG_OK_FOR_INDEX_P (XEXP (X, 0))        \
1000
      && CONST_INT_P (XEXP (X, 1))              \
1001
      && (INTVAL (XEXP (X, 1)) == 2             \
1002
          || INTVAL (XEXP (X, 1)) == 4)))
1003
 
1004
/* A PIC operand looks like a normal symbol here.  At output we dress it
1005
   in "[rPIC+symbol:GOT]" (global symbol) or "rPIC+symbol:GOTOFF" (local
1006
   symbol) so we exclude all addressing modes where we can't replace a
1007
   plain "symbol" with that.  A global PIC symbol does not fit anywhere
1008
   here (but is thankfully a general_operand in itself).  A local PIC
1009
   symbol is valid for the plain "symbol + offset" case.  */
1010
#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)                 \
1011
 {                                                              \
1012
   rtx x1, x2;                                                  \
1013
   if (BASE_OR_AUTOINCR_P (X))                                  \
1014
     goto ADDR;                                                 \
1015
   else if (TARGET_V32)                                         \
1016
     /* Nothing else is valid then.  */                         \
1017
     ;                                                          \
1018
   else if (CONSTANT_INDEX_P (X))                               \
1019
     goto ADDR;                                                 \
1020
   /* Indexed?  */                                              \
1021
   else if (GET_CODE (X) == PLUS)                               \
1022
     {                                                          \
1023
       x1 = XEXP (X, 0);                                 \
1024
       x2 = XEXP (X, 1);                                        \
1025
       /* BDAP o, Rd.  */                                       \
1026
       if ((BASE_P (x1) && CONSTANT_INDEX_P (x2))               \
1027
           || (BASE_P (x2) && CONSTANT_INDEX_P (x1))            \
1028
            /* BDAP Rs[+], Rd.  */                              \
1029
           || (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD           \
1030
               && ((BASE_P (x1) && BDAP_INDEX_P (x2))           \
1031
                   || (BASE_P (x2) && BDAP_INDEX_P (x1))        \
1032
                   /* BIAP.m Rs, Rd */                          \
1033
                   || (BASE_P (x1) && BIAP_INDEX_P (x2))        \
1034
                   || (BASE_P (x2) && BIAP_INDEX_P (x1)))))     \
1035
         goto ADDR;                                             \
1036
     }                                                          \
1037
   else if (MEM_P (X))                                          \
1038
     {                                                          \
1039
       /* DIP (Rs).  Reject [[reg+]] and [[reg]] for            \
1040
          DImode (long long).  */                               \
1041
       if (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD               \
1042
           && (BASE_P (XEXP (X, 0))                              \
1043
               || BASE_OR_AUTOINCR_P (XEXP (X, 0))))             \
1044
         goto ADDR;                                             \
1045
     }                                                          \
1046
 }
1047
 
1048
#ifndef REG_OK_STRICT
1049
 /* Nonzero if X is a hard reg that can be used as a base reg
1050
    or if it is a pseudo reg.  */
1051
# define REG_OK_FOR_BASE_P(X)                   \
1052
 (REGNO (X) <= CRIS_LAST_GENERAL_REGISTER       \
1053
  || REGNO (X) == ARG_POINTER_REGNUM            \
1054
  || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1055
#else
1056
 /* Nonzero if X is a hard reg that can be used as a base reg.  */
1057
# define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
1058
#endif
1059
 
1060
#ifndef REG_OK_STRICT
1061
 /* Nonzero if X is a hard reg that can be used as an index
1062
    or if it is a pseudo reg.  */
1063
# define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
1064
#else
1065
 /* Nonzero if X is a hard reg that can be used as an index.  */
1066
# define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
1067
#endif
1068
 
1069
/* Fix reloads known to cause suboptimal spilling.  */
1070
#define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN)      \
1071
  do                                                                    \
1072
    {                                                                   \
1073
      if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
1074
        goto WIN;                                                       \
1075
    }                                                                   \
1076
  while (0)
1077
 
1078
#define LEGITIMATE_CONSTANT_P(X) 1
1079
 
1080
 
1081
/* Node: Condition Code */
1082
 
1083
#define NOTICE_UPDATE_CC(EXP, INSN) cris_notice_update_cc (EXP, INSN)
1084
 
1085
/* FIXME: Maybe define CANONICALIZE_COMPARISON later, when playing with
1086
   optimizations.  It is needed; currently we do this with instruction
1087
   patterns and NOTICE_UPDATE_CC.  */
1088
 
1089
 
1090
/* Node: Costs */
1091
 
1092
#define REGISTER_MOVE_COST(MODE, FROM, TO)      \
1093
  cris_register_move_cost (MODE, FROM, TO)
1094
 
1095
/* This isn't strictly correct for v0..3 in buswidth-8bit mode, but
1096
   should suffice.  */
1097
#define MEMORY_MOVE_COST(M, CLASS, IN) \
1098
 (((M) == QImode) ? 4 : ((M) == HImode) ? 4 : 6)
1099
 
1100
/* Regardless of the presence of delay slots, the default value of 1 for
1101
   BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
1102
   with testcases ipps and gcc, giving smallest and fastest code.  */
1103
 
1104
#define SLOW_BYTE_ACCESS 0
1105
 
1106
/* This is the threshold *below* which inline move sequences of
1107
   word-length sizes will be emitted.  The "9" will translate to
1108
   (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
1109
   (8 instruction sequences) or less.  */
1110
#define MOVE_RATIO(speed) 9
1111
 
1112
 
1113
/* Node: Sections */
1114
 
1115
#define TEXT_SECTION_ASM_OP "\t.text"
1116
 
1117
#define DATA_SECTION_ASM_OP "\t.data"
1118
 
1119
#define FORCE_EH_FRAME_INFO_IN_DATA_SECTION (! TARGET_ELF)
1120
 
1121
/* The jump table is immediately connected to the preceding insn.  */
1122
#define JUMP_TABLES_IN_TEXT_SECTION 1
1123
 
1124
 
1125
/* Node: PIC */
1126
 
1127
/* Helper type.  */
1128
 
1129
enum cris_pic_symbol_type
1130
  {
1131
    cris_no_symbol = 0,
1132
    cris_got_symbol = 1,
1133
    cris_rel_symbol = 2,
1134
    cris_got_symbol_needing_fixup = 3,
1135
    cris_invalid_pic_symbol = 4
1136
  };
1137
 
1138
#define PIC_OFFSET_TABLE_REGNUM (flag_pic ? CRIS_GOT_REGNUM : INVALID_REGNUM)
1139
 
1140
#define LEGITIMATE_PIC_OPERAND_P(X) cris_legitimate_pic_operand (X)
1141
 
1142
 
1143
/* Node: File Framework */
1144
 
1145
/* We don't want an .ident for gcc.  To avoid that but still support
1146
   #ident, we override ASM_OUTPUT_IDENT and, since the gcc .ident is its
1147
   only use besides ASM_OUTPUT_IDENT, undef IDENT_ASM_OP from elfos.h.  */
1148
#undef IDENT_ASM_OP
1149
#undef ASM_OUTPUT_IDENT
1150
#define ASM_OUTPUT_IDENT(FILE, NAME) \
1151
  fprintf (FILE, "%s\"%s\"\n", "\t.ident\t", NAME);
1152
 
1153
#define ASM_APP_ON "#APP\n"
1154
 
1155
#define ASM_APP_OFF "#NO_APP\n"
1156
 
1157
 
1158
/* Node: Data Output */
1159
 
1160
#define OUTPUT_ADDR_CONST_EXTRA(STREAM, X, FAIL) \
1161
  do { if (!cris_output_addr_const_extra (STREAM, X)) goto FAIL; } while (0)
1162
 
1163
#define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
1164
 
1165
/* Node: Uninitialized Data */
1166
 
1167
/* Remember to round off odd values if we want data alignment,
1168
   since we cannot do that with an .align directive.
1169
 
1170
   Using .comm causes the space not to be reserved in .bss, but by
1171
   tricks with the symbol type.  Not good if other tools than binutils
1172
   are used on the object files.  Since ".global ... .lcomm ..." works, we
1173
   use that.  Use .._ALIGNED_COMMON, since gcc whines when we only have
1174
   ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
1175
   the one to check.  This done for a.out only.  */
1176
/* FIXME: I suspect a bug in gcc with alignment.  Do not warn until
1177
   investigated; it mucks up the testsuite results.  */
1178
#define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
1179
  do                                                                    \
1180
    {                                                                   \
1181
      int align_ = (ALIGN) / BITS_PER_UNIT;                             \
1182
      if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4)        \
1183
        align_ = 4;                                                     \
1184
      else if (TARGET_DATA_ALIGN && align_ < 2)                         \
1185
        align_ = 2;                                                     \
1186
      /* FIXME: Do we need this?  */                                    \
1187
      else if (align_ < 1)                                              \
1188
        align_ = 1;                                                     \
1189
                                                                        \
1190
      if (TARGET_ELF)                                                   \
1191
        {                                                               \
1192
          if (LOCAL)                                                    \
1193
            {                                                           \
1194
              fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
1195
              assemble_name ((FILE), (NAME));                           \
1196
              fprintf ((FILE), "\n");                                   \
1197
            }                                                           \
1198
          fprintf ((FILE), "%s", COMMON_ASM_OP);                        \
1199
          assemble_name ((FILE), (NAME));                               \
1200
          fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_);            \
1201
        }                                                               \
1202
      else                                                              \
1203
        {                                                               \
1204
          /* We can't tell a one-only or weak COMM from a "global       \
1205
             COMM" so just make all non-locals weak.  */                \
1206
          if (! (LOCAL))                                                \
1207
            ASM_WEAKEN_LABEL (FILE, NAME);                              \
1208
          fputs ("\t.lcomm ", (FILE));                                  \
1209
          assemble_name ((FILE), (NAME));                               \
1210
          fprintf ((FILE), ",%u\n",                                     \
1211
                   ((int)(SIZE) + (align_ - 1)) & ~(align_ - 1));       \
1212
        }                                                               \
1213
    }                                                                   \
1214
  while (0)
1215
 
1216
#define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
1217
 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
1218
 
1219
#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
1220
#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
1221
 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
1222
 
1223
/* Node: Label Output */
1224
 
1225
/* Globalizing directive for a label.  */
1226
#define GLOBAL_ASM_OP "\t.global "
1227
 
1228
#define SUPPORTS_WEAK 1
1229
 
1230
#define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
1231
 cris_asm_output_symbol_ref (STREAM, SYM)
1232
 
1233
#define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
1234
 cris_asm_output_label_ref (STREAM, BUF)
1235
 
1236
/* Remove any previous definition (elfos.h).  */
1237
#undef ASM_GENERATE_INTERNAL_LABEL
1238
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1239
  sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
1240
 
1241
/* Node: Initialization */
1242
/* (no definitions) */
1243
 
1244
/* Node: Macros for Initialization */
1245
/* (no definitions) */
1246
 
1247
/* Node: Instruction Output */
1248
 
1249
#define REGISTER_NAMES                                  \
1250
 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
1251
  "r9", "r10", "r11", "r12", "r13", "sp", "acr", "srp", "mof", "faked_ap", "dccr"}
1252
 
1253
#define ADDITIONAL_REGISTER_NAMES \
1254
 {{"r14", 14}, {"r15", 15}, {"pc", 15}}
1255
 
1256
#define PRINT_OPERAND(FILE, X, CODE)            \
1257
 cris_print_operand (FILE, X, CODE)
1258
 
1259
/* For delay-slot handling.  */
1260
#define PRINT_OPERAND_PUNCT_VALID_P(CODE)       \
1261
 ((CODE) == '#' || (CODE) == '!' || (CODE) == ':')
1262
 
1263
#define PRINT_OPERAND_ADDRESS(FILE, ADDR)       \
1264
   cris_print_operand_address (FILE, ADDR)
1265
 
1266
/* Output an empty line to illustrate the presence of the delay slot.  */
1267
#define DBR_OUTPUT_SEQEND(FILE) \
1268
  fprintf (FILE, "\n")
1269
 
1270
#define LOCAL_LABEL_PREFIX (TARGET_ELF ? "." : "")
1271
 
1272
/* cppinit.c initializes a const array from this, so it must be constant,
1273
   can't have it different based on options.  Luckily, the prefix is
1274
   always allowed, so let's have it on all GCC-generated code.  Note that
1275
   we have this verbatim everywhere in the back-end, not using %R or %s or
1276
   such.  */
1277
#define REGISTER_PREFIX "$"
1278
 
1279
/* Remove any previous definition (elfos.h).  */
1280
/* We use -fno-leading-underscore to remove it, when necessary.  */
1281
#undef USER_LABEL_PREFIX
1282
#define USER_LABEL_PREFIX "_"
1283
 
1284
#define ASM_OUTPUT_REG_PUSH(FILE, REGNO)                                \
1285
  fprintf (FILE,                                                        \
1286
           TARGET_V32                                                   \
1287
           ? "\tsubq 4,$sp\n\tmove $%s,[$sp]\n" : "\tpush $%s\n",       \
1288
           reg_names[REGNO])
1289
 
1290
#define ASM_OUTPUT_REG_POP(FILE, REGNO) \
1291
  fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
1292
 
1293
 
1294
/* Node: Dispatch Tables */
1295
 
1296
#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)                \
1297
  do                                                                    \
1298
    {                                                                   \
1299
      if (TARGET_V32)                                                   \
1300
       asm_fprintf (FILE, "\t.word %LL%d-.\n", VALUE);                  \
1301
      else                                                              \
1302
       asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL);         \
1303
    }                                                                   \
1304
  while (0)
1305
 
1306
#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
1307
  asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
1308
 
1309
/* Defined to also emit an .align in elfos.h.  We don't want that.  */
1310
#undef ASM_OUTPUT_CASE_LABEL
1311
 
1312
/* Since the "bound" insn loads the comparison value if the compared<
1313
   value (register) is out of bounds (0..comparison value-1), we need
1314
   to output another case to catch it.
1315
   The way to find it is to look for the label_ref at the else-arm inside
1316
   the expanded casesi core-insn.
1317
   FIXME: Check this construct when changing to new version of gcc.  */
1318
#define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE)                         \
1319
  cris_asm_output_case_end (STREAM, NUM, TABLE)
1320
 
1321
 
1322
/* Node: Exception Region Output */
1323
/* (no definitions) */
1324
/* FIXME: Fill in with our own optimized layout.  */
1325
 
1326
/* Node: Alignment Output */
1327
 
1328
#define ASM_OUTPUT_ALIGN(FILE, LOG)  \
1329
 fprintf (FILE, "\t.align %d\n", (LOG))
1330
 
1331
 
1332
/* Node: All Debuggers */
1333
 
1334
#define DBX_REGISTER_NUMBER(REGNO)                              \
1335
 ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM :      \
1336
  (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM :      \
1337
  (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM :      \
1338
 (REGNO))
1339
 
1340
/* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET.  */
1341
 
1342
 
1343
/* Node: DBX Options */
1344
 
1345
/* Is this correct? Check later.  */
1346
#define DBX_NO_XREFS
1347
 
1348
#define DBX_CONTIN_LENGTH 0
1349
 
1350
/* FIXME: Is this needed when we have 0 DBX_CONTIN_LENGTH?  */
1351
#define DBX_CONTIN_CHAR '?'
1352
 
1353
 
1354
/* Node: DBX Hooks */
1355
/* (no definitions) */
1356
 
1357
/* Node: File names and DBX */
1358
/* (no definitions) */
1359
 
1360
 
1361
/* Node: SDB and DWARF */
1362
/* (no definitions) */
1363
 
1364
/* Node: Misc */
1365
 
1366
/* A combination of the bound (umin) insn together with a
1367
   sign-extended add via the table to PC seems optimal.
1368
   If the table overflows, the assembler will take care of it.
1369
   Theoretically, in extreme cases (uncertain if they occur), an error
1370
   will be emitted, so FIXME: Check how large case-tables are emitted,
1371
   possible add an option to emit SImode case-tables.  */
1372
#define CASE_VECTOR_MODE HImode
1373
 
1374
#define CASE_VECTOR_PC_RELATIVE 1
1375
 
1376
/* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
1377
   used when broken-.word could possibly fail (plus testcase).  */
1378
 
1379
#define FIXUNS_TRUNC_LIKE_FIX_TRUNC
1380
 
1381
/* This is the number of bytes that can be moved in one
1382
   reasonably fast instruction sequence.  For CRIS, this is two
1383
   instructions: mem => reg, reg => mem.  */
1384
#define MOVE_MAX 4
1385
 
1386
/* Maybe SHIFT_COUNT_TRUNCATED is safe to define?  FIXME: Check later.  */
1387
 
1388
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1389
 
1390
#define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1391
#define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1392
 
1393
#define Pmode SImode
1394
 
1395
#define FUNCTION_MODE QImode
1396
 
1397
#define NO_IMPLICIT_EXTERN_C
1398
 
1399
/* No specific purpose other than warningless compatibility.  */
1400
#define HANDLE_PRAGMA_PACK_PUSH_POP 1
1401
 
1402
/*
1403
 * Local variables:
1404
 * eval: (c-set-style "gnu")
1405
 * indent-tabs-mode: t
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