gcc/config/nios2/nios2.h

   1 /* Definitions of target machine for Altera Nios II.
   2    Copyright (C) 2012-2017 Free Software Foundation, Inc.
   3    Contributed by Jonah Graham (jgraham@altera.com),
   4    Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com).
   5    Contributed by Mentor Graphics, Inc.
   6
   7    This file is part of GCC.
   8
   9    GCC is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published
  11    by the Free Software Foundation; either version 3, or (at your
  12    option) any later version.
  13
  14    GCC is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  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/>.  */
  22
  23 #ifndef GCC_NIOS2_H
  24 #define GCC_NIOS2_H
  25
  26 /* Indicate R2 ISA level support.  */
  27 #define TARGET_ARCH_R2 (nios2_arch_option == ARCH_R2)
  28
  29 /* FPU insn codes declared here.  */
  30 #include "config/nios2/nios2-opts.h"
  31
  32 /* Define built-in preprocessor macros.  */
  33 #define TARGET_CPU_CPP_BUILTINS()                   \
  34   do                                                \
  35     {                                               \
  36       builtin_define_std ("NIOS2");                 \
  37       builtin_define_std ("nios2");                 \
  38       if (TARGET_BIG_ENDIAN)                        \
  39         builtin_define_std ("nios2_big_endian");    \
  40       else                                          \
  41         builtin_define_std ("nios2_little_endian"); \
  42       builtin_define_with_int_value (               \
  43         "__nios2_arch__", (int) nios2_arch_option); \
  44     }                                               \
  45   while (0)
  46
  47 /* We're little endian, unless otherwise specified by defining
  48    BIG_ENDIAN_FLAG.  */
  49 #ifndef TARGET_ENDIAN_DEFAULT
  50 # define TARGET_ENDIAN_DEFAULT 0
  51 #endif
  52
  53 /* Default target_flags if no switches specified.  */
  54 #ifndef TARGET_DEFAULT
  55 # define TARGET_DEFAULT (MASK_HAS_MUL | TARGET_ENDIAN_DEFAULT)
  56 #endif
  57
  58 #define OPTION_DEFAULT_SPECS \
  59   {"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" }
  60
  61 #define CC1_SPEC "%{G*}"
  62
  63 #if TARGET_ENDIAN_DEFAULT == 0
  64 # define ASM_SPEC "%{!meb:-EL} %{meb:-EB} %{march=*:-march=%*}"
  65 # define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}"
  66 # define MULTILIB_DEFAULTS { "EL" }
  67 #else
  68 # define ASM_SPEC "%{!mel:-EB} %{mel:-EL} %{march=*:-march=%*}"
  69 # define LINK_SPEC_ENDIAN "%{!mel:-EB} %{mel:-EL}"
  70 # define MULTILIB_DEFAULTS { "EB" }
  71 #endif
  72
  73 #define LINK_SPEC LINK_SPEC_ENDIAN \
  74   " %{shared:-shared} \
  75     %{static:-Bstatic}"
  76
  77
  78 /* Storage layout.  */
  79
  80 #define DEFAULT_SIGNED_CHAR 1
  81 #define BITS_BIG_ENDIAN 0
  82 #define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
  83 #define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
  84 #define BITS_PER_WORD 32
  85 #define UNITS_PER_WORD 4
  86 #define POINTER_SIZE 32
  87 #define BIGGEST_ALIGNMENT 32
  88 #define STRICT_ALIGNMENT 1
  89 #define FUNCTION_BOUNDARY 32
  90 #define PARM_BOUNDARY 32
  91 #define STACK_BOUNDARY 32
  92 #define PREFERRED_STACK_BOUNDARY 32
  93 #define MAX_FIXED_MODE_SIZE 64
  94
  95 #define CONSTANT_ALIGNMENT(EXP, ALIGN)                          \
  96   ((TREE_CODE (EXP) == STRING_CST)                              \
  97    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
  98
  99 #define LABEL_ALIGN(LABEL) nios2_label_align (LABEL)
 100
 101 /* Layout of source language data types.  */
 102
 103 #define INT_TYPE_SIZE 32
 104 #define SHORT_TYPE_SIZE 16
 105 #define LONG_TYPE_SIZE 32
 106 #define LONG_LONG_TYPE_SIZE 64
 107 #define FLOAT_TYPE_SIZE 32
 108 #define DOUBLE_TYPE_SIZE 64
 109 #define LONG_DOUBLE_TYPE_SIZE DOUBLE_TYPE_SIZE
 110
 111 #undef SIZE_TYPE
 112 #define SIZE_TYPE "unsigned int"
 113
 114 #undef PTRDIFF_TYPE
 115 #define PTRDIFF_TYPE "int"
 116
 117
 118 /* Basic characteristics of Nios II registers:
 119
 120    Regno  Name
 121    0      r0       zero    always zero
 122    1      r1       at      Assembler Temporary
 123    2-3    r2-r3            Return Location
 124    4-7    r4-r7            Register Arguments
 125    8-15   r8-r15           Caller Saved Registers
 126    16-22  r16-r22          Callee Saved Registers
 127    22     r22              Global Offset Table pointer (Linux ABI only)
 128    23     r23              Thread pointer (Linux ABI only)
 129    24     r24      et      Exception Temporary
 130    25     r25      bt      Breakpoint Temporary
 131    26     r26      gp      Global Pointer
 132    27     r27      sp      Stack Pointer
 133    28     r28      fp      Frame Pointer
 134    29     r29      ea      Exception Return Address
 135    30     r30      ba      Breakpoint Return Address
 136    31     r31      ra      Return Address
 137
 138    32     ctl0     status
 139    33     ctl1     estatus STATUS saved by exception
 140    34     ctl2     bstatus STATUS saved by break
 141    35     ctl3     ipri    Interrupt Priority Mask
 142    36     ctl4     ecause  Exception Cause
 143
 144    37     pc               Not an actual register
 145
 146    38     fake_fp          Fake Frame Pointer (always eliminated)
 147    39     fake_ap          Fake Argument Pointer (always eliminated)
 148    40                      First Pseudo Register
 149
 150    In addition, r12 is used as the static chain register and r13, r14, and r15
 151    are clobbered by PLT code sequences.
 152
 153    The definitions for all the hard register numbers are located in nios2.md.
 154 */
 155
 156 #define FIXED_REGISTERS                      \
 157   {                                          \
 158 /*        +0  1  2  3  4  5  6  7  8  9 */   \
 159 /*   0 */  1, 1, 0, 0, 0, 0, 0, 0, 0, 0,     \
 160 /*  10 */  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,     \
 161 /*  20 */  0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1,     \
 162 /*  30 */  1, 0, 1, 1, 1, 1, 1, 1, 1, 1,     \
 163   }
 164
 165 /* Call used == caller saved + fixed regs + args + ret vals.  */
 166 #define CALL_USED_REGISTERS                  \
 167   {                                          \
 168 /*        +0  1  2  3  4  5  6  7  8  9 */   \
 169 /*   0 */  1, 1, 1, 1, 1, 1, 1, 1, 1, 1,     \
 170 /*  10 */  1, 1, 1, 1, 1, 1, 0, 0, 0, 0,     \
 171 /*  20 */  0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1,     \
 172 /*  30 */  1, 1, 1, 1, 1, 1, 1, 1, 1, 1,     \
 173   }
 174
 175 #define HARD_REGNO_NREGS(REGNO, MODE)            \
 176   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 177
 178 /* Order in which to allocate registers.  Each register must be
 179    listed once.  This is the default ordering for R1 and non-CDX R2
 180    code.  For CDX, we overwrite this in ADJUST_REG_ALLOC_ORDER.  */
 181 #define REG_ALLOC_ORDER                                                 \
 182   { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \
 183       20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, \
 184       37, 38, 39 }
 185
 186 #define ADJUST_REG_ALLOC_ORDER nios2_adjust_reg_alloc_order ()
 187
 188 /* Caller-save costs can be less emphasized under R2 CDX, where we can
 189    use push.n/pop.n.  */
 190 #define HONOR_REG_ALLOC_ORDER (TARGET_HAS_CDX)
 191
 192 /* Register Classes.  */
 193
 194 enum reg_class
 195 {
 196   NO_REGS,
 197   SIB_REGS,
 198   IJMP_REGS,
 199   GP_REGS,
 200   ALL_REGS,
 201   LIM_REG_CLASSES
 202 };
 203
 204 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 205
 206 #define REG_CLASS_NAMES   \
 207   {  "NO_REGS",           \
 208      "SIB_REGS",          \
 209      "IJMP_REGS",         \
 210      "GP_REGS",           \
 211      "ALL_REGS" }
 212
 213 #define GENERAL_REGS ALL_REGS
 214
 215 #define REG_CLASS_CONTENTS                      \
 216   {                                             \
 217     /* NO_REGS    */ { 0, 0},                   \
 218     /* SIB_REGS   */ { 0xfe0c, 0},              \
 219     /* IJMP_REGS  */ { 0x7fffffff, 0},          \
 220     /* GP_REGS    */ {~0, 0},                   \
 221     /* ALL_REGS   */ {~0,~0}                    \
 222   }
 223
 224
 225 #define GP_REG_P(REGNO) ((unsigned)(REGNO) <= LAST_GP_REG)
 226 #define REGNO_REG_CLASS(REGNO) (GP_REG_P (REGNO) ? GP_REGS : ALL_REGS)
 227 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 228   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 229
 230 #define CDX_REG_P(REGNO)                                                \
 231   ((REGNO) == 16 || (REGNO) == 17 || (2 <= (REGNO) && (REGNO) <= 7))
 232
 233 /* Tests for various kinds of constants used in the Nios II port.  */
 234
 235 #define SMALL_INT(X) ((unsigned HOST_WIDE_INT)(X) + 0x8000 < 0x10000)
 236 #define SMALL_INT12(X) ((unsigned HOST_WIDE_INT)(X) + 0x800 < 0x1000)
 237 #define SMALL_INT_UNSIGNED(X) ((X) >= 0 && (X) < 0x10000)
 238 #define UPPER16_INT(X) (((X) & 0xffff) == 0)
 239 #define SHIFT_INT(X) ((X) >= 0 && (X) <= 31)
 240 #define RDWRCTL_INT(X) ((X) >= 0 && (X) <= 31)
 241 #define CUSTOM_INSN_OPCODE(X) ((X) >= 0 && (X) <= 255)
 242 #define ANDCLEAR_INT(X) \
 243   (((X) & 0xffff) == 0xffff || (((X) >> 16) & 0xffff) == 0xffff)
 244
 245 /* Say that the epilogue uses the return address register.  Note that
 246    in the case of sibcalls, the values "used by the epilogue" are
 247    considered live at the start of the called function.  */
 248 #define EPILOGUE_USES(REGNO) (epilogue_completed && (REGNO) == RA_REGNO)
 249
 250 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 251    the stack pointer does not matter.  The value is tested only in
 252    functions that have frame pointers.
 253    No definition is equivalent to always zero.  */
 254
 255 #define EXIT_IGNORE_STACK 1
 256
 257 /* Trampolines use a 5-instruction sequence.  */
 258 #define TRAMPOLINE_SIZE 20
 259
 260 /* Stack layout.  */
 261 #define STACK_GROWS_DOWNWARD 1
 262 #define STARTING_FRAME_OFFSET 0
 263 #define FIRST_PARM_OFFSET(FUNDECL) 0
 264
 265 /* Before the prologue, RA lives in r31.  */
 266 #define INCOMING_RETURN_ADDR_RTX  gen_rtx_REG (Pmode, RA_REGNO)
 267 #define RETURN_ADDR_RTX(C,F) nios2_get_return_address (C)
 268
 269 #define DWARF_FRAME_RETURN_COLUMN RA_REGNO
 270
 271 /* The CFA includes the pretend args.  */
 272 #define ARG_POINTER_CFA_OFFSET(FNDECL) \
 273   (gcc_assert ((FNDECL) == current_function_decl), \
 274    FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
 275
 276 /* Frame/arg pointer elimination settings.  */
 277 #define ELIMINABLE_REGS                                                 \
 278 {{ ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
 279  { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM},                    \
 280  { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},                         \
 281  { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
 282
 283 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 284   (OFFSET) = nios2_initial_elimination_offset ((FROM), (TO))
 285
 286 /* Calling convention definitions.  */
 287 typedef struct nios2_args
 288 {
 289   int regs_used;
 290 } CUMULATIVE_ARGS;
 291
 292 #define NUM_ARG_REGS (LAST_ARG_REGNO - FIRST_ARG_REGNO + 1)
 293
 294 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 295   do { (CUM).regs_used = 0; } while (0)
 296
 297 #define PAD_VARARGS_DOWN \
 298   (targetm.calls.function_arg_padding (TYPE_MODE (type), type) == PAD_DOWNWARD)
 299
 300 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 301   (nios2_block_reg_padding ((MODE), (TYPE), (FIRST)))
 302
 303 #define FUNCTION_ARG_REGNO_P(REGNO) \
 304   ((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO)
 305
 306 /* Passing function arguments on stack.  */
 307 #define PUSH_ARGS 0
 308 #define ACCUMULATE_OUTGOING_ARGS 1
 309
 310 /* We define TARGET_RETURN_IN_MEMORY, so set to zero.  */
 311 #define DEFAULT_PCC_STRUCT_RETURN 0
 312
 313 /* Profiling.  */
 314 #define PROFILE_BEFORE_PROLOGUE
 315 #define NO_PROFILE_COUNTERS 1
 316 #define FUNCTION_PROFILER(FILE, LABELNO) \
 317   nios2_function_profiler ((FILE), (LABELNO))
 318
 319 /* Addressing modes.  */
 320
 321 #define CONSTANT_ADDRESS_P(X) \
 322   (CONSTANT_P (X) && memory_address_p (SImode, X))
 323
 324 #define MAX_REGS_PER_ADDRESS 1
 325 #define BASE_REG_CLASS ALL_REGS
 326 #define INDEX_REG_CLASS NO_REGS
 327
 328 #define REGNO_OK_FOR_BASE_P(REGNO) nios2_regno_ok_for_base_p ((REGNO), true)
 329 #define REGNO_OK_FOR_INDEX_P(REGNO) 0
 330
 331 /* Describing Relative Costs of Operations.  */
 332 #define MOVE_MAX 4
 333 #define SLOW_BYTE_ACCESS 1
 334
 335 /* It is as good to call a constant function address as to call an address
 336    kept in a register.  */
 337 #define NO_FUNCTION_CSE 1
 338
 339 /* Position independent code.  */
 340
 341 #define PIC_OFFSET_TABLE_REGNUM 22
 342 #define LEGITIMATE_PIC_OPERAND_P(X) nios2_legitimate_pic_operand_p (X)
 343
 344 /* Define output assembler language.  */
 345
 346 #define ASM_APP_ON "#APP\n"
 347 #define ASM_APP_OFF "#NO_APP\n"
 348
 349 #define ASM_COMMENT_START "# "
 350
 351 #define GLOBAL_ASM_OP "\t.global\t"
 352
 353 #define REGISTER_NAMES \
 354   {                    \
 355     "zero", \
 356     "at", \
 357     "r2", \
 358     "r3", \
 359     "r4", \
 360     "r5", \
 361     "r6", \
 362     "r7", \
 363     "r8", \
 364     "r9", \
 365     "r10", \
 366     "r11", \
 367     "r12", \
 368     "r13", \
 369     "r14", \
 370     "r15", \
 371     "r16", \
 372     "r17", \
 373     "r18", \
 374     "r19", \
 375     "r20", \
 376     "r21", \
 377     "r22", \
 378     "r23", \
 379     "et", \
 380     "bt", \
 381     "gp", \
 382     "sp", \
 383     "fp", \
 384     "ta", \
 385     "ba", \
 386     "ra", \
 387     "status", \
 388     "estatus", \
 389     "bstatus", \
 390     "ipri", \
 391     "ecause", \
 392     "pc", \
 393     "fake_fp", \
 394     "fake_ap", \
 395 }
 396
 397 #define ADDITIONAL_REGISTER_NAMES       \
 398 {                                       \
 399   {"r0", 0},                            \
 400   {"r1", 1},                            \
 401   {"r24", 24},                          \
 402   {"r25", 25},                          \
 403   {"r26", 26},                          \
 404   {"r27", 27},                          \
 405   {"r28", 28},                          \
 406   {"r29", 29},                          \
 407   {"r30", 30},                          \
 408   {"r31", 31}                           \
 409 }
 410
 411 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
 412   do                                                                    \
 413     {                                                                   \
 414       fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
 415       fprintf (FILE, ".L%u\n", (unsigned) (VALUE));                     \
 416     }                                                                   \
 417   while (0)
 418
 419 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)\
 420   do                                                                    \
 421     {                                                                   \
 422       fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), STREAM); \
 423       fprintf (STREAM, ".L%u-.L%u\n", (unsigned) (VALUE), (unsigned) (REL)); \
 424     }                                                                   \
 425   while (0)
 426
 427 /* Section directives.  */
 428
 429 /* Output before read-only data.  */
 430 #define TEXT_SECTION_ASM_OP "\t.section\t.text"
 431
 432 /* Output before writable data.  */
 433 #define DATA_SECTION_ASM_OP "\t.section\t.data"
 434
 435 /* Output before uninitialized data.  */
 436 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 437
 438 /* Output before 'small' uninitialized data.  */
 439 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss"
 440
 441 #ifndef IN_LIBGCC2
 442 /* Default the definition of "small data" to 8 bytes.  */
 443 extern unsigned HOST_WIDE_INT nios2_section_threshold;
 444 #endif
 445
 446 #define NIOS2_DEFAULT_GVALUE 8
 447
 448 /* This says how to output assembler code to declare an
 449    uninitialized external linkage data object.  Under SVR4,
 450    the linker seems to want the alignment of data objects
 451    to depend on their types.  We do exactly that here.  */
 452 #undef COMMON_ASM_OP
 453 #define COMMON_ASM_OP   "\t.comm\t"
 454
 455 #define ASM_OUTPUT_ALIGN(FILE, LOG)                  \
 456   do {                                               \
 457     fprintf ((FILE), "%s%d\n", ALIGN_ASM_OP, (LOG)); \
 458   } while (0)
 459
 460 #undef  ASM_OUTPUT_ALIGNED_COMMON
 461 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 462 do                                                                      \
 463   {                                                                     \
 464     fprintf ((FILE), "%s", COMMON_ASM_OP);                              \
 465     assemble_name ((FILE), (NAME));                                     \
 466     fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE),   \
 467              (ALIGN) / BITS_PER_UNIT);                                  \
 468   }                                                                     \
 469 while (0)
 470
 471
 472 /* This says how to output assembler code to declare an
 473    uninitialized internal linkage data object.  Under SVR4,
 474    the linker seems to want the alignment of data objects
 475    to depend on their types.  We do exactly that here.  */
 476
 477 #undef  ASM_OUTPUT_ALIGNED_LOCAL
 478 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 479 do {                                                                    \
 480   if ((SIZE) <= nios2_section_threshold)                                \
 481     switch_to_section (sbss_section);                                   \
 482   else                                                                  \
 483     switch_to_section (bss_section);                                    \
 484   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
 485   if (!flag_inhibit_size_directive)                                     \
 486     ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                       \
 487   ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));       \
 488   ASM_OUTPUT_LABEL(FILE, NAME);                                         \
 489   ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                         \
 490 } while (0)
 491
 492 /* Put the jump tables in .text because when using position-independent code,
 493    Nios II elf has no relocation that can represent arbitrary differences
 494    between symbols in different sections.  */
 495 #define JUMP_TABLES_IN_TEXT_SECTION 1
 496
 497 /* Exception handling.  */
 498
 499 /* Describe __builtin_eh_return.  */
 500 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, LAST_RETVAL_REGNO)
 501 #define EH_RETURN_DATA_REGNO(N) ((N) <= (LAST_ARG_REGNO - FIRST_ARG_REGNO) \
 502                                  ? (N) + FIRST_ARG_REGNO : INVALID_REGNUM)
 503
 504 /* Nios II has no appropriate relocations for a 32-bit PC-relative or
 505    section-relative pointer encoding.  This therefore always chooses an
 506    absolute representation for pointers.  An unfortunate consequence of
 507    this is that ld complains about the absolute fde encoding when linking
 508    with -shared or -fpie, but the warning is harmless and there seems to
 509    be no good way to suppress it.  */
 510 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)              \
 511   (flag_pic ? DW_EH_PE_aligned : DW_EH_PE_sdata4)
 512
 513 /* Misc. parameters.  */
 514
 515 #define STORE_FLAG_VALUE 1
 516 #define Pmode SImode
 517 #define FUNCTION_MODE QImode
 518
 519 #define CASE_VECTOR_MODE Pmode
 520
 521 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 522
 523 #define LOAD_EXTEND_OP(MODE) (ZERO_EXTEND)
 524
 525 #define WORD_REGISTER_OPERATIONS 1
 526
 527 #endif /* GCC_NIOS2_H */