gcc/config/alpha/predicates.md

   1 ;; Predicate definitions for DEC Alpha.
   2 ;; Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   3 ;;
   4 ;; This file is part of GCC.
   5 ;;
   6 ;; GCC is free software; you can redistribute it and/or modify
   7 ;; it under the terms of the GNU General Public License as published by
   8 ;; the Free Software Foundation; either version 2, or (at your option)
   9 ;; any later version.
  10 ;;
  11 ;; GCC is distributed in the hope that it will be useful,
  12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;; GNU General Public License for more details.
  15 ;;
  16 ;; You should have received a copy of the GNU General Public License
  17 ;; along with GCC; see the file COPYING.  If not, write to
  18 ;; the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 ;; Boston, MA 02110-1301, USA.
  20
  21 ;; Return 1 if OP is the zero constant for MODE.
  22 (define_predicate "const0_operand"
  23   (and (match_code "const_int,const_double,const_vector")
  24        (match_test "op == CONST0_RTX (mode)")))
  25
  26 ;; Returns true if OP is either the constant zero or a register.
  27 (define_predicate "reg_or_0_operand"
  28   (ior (match_operand 0 "register_operand")
  29        (match_operand 0 "const0_operand")))
  30
  31 ;; Return 1 if OP is a constant in the range of 0-63 (for a shift) or
  32 ;; any register.
  33 (define_predicate "reg_or_6bit_operand"
  34   (if_then_else (match_code "const_int")
  35     (match_test "INTVAL (op) >= 0 && INTVAL (op) < 64")
  36     (match_operand 0 "register_operand")))
  37
  38 ;; Return 1 if OP is an 8-bit constant.
  39 (define_predicate "cint8_operand"
  40   (and (match_code "const_int")
  41        (match_test "INTVAL (op) >= 0 && INTVAL (op) < 256")))
  42
  43 ;; Return 1 if OP is an 8-bit constant or any register.
  44 (define_predicate "reg_or_8bit_operand"
  45   (if_then_else (match_code "const_int")
  46     (match_test "INTVAL (op) >= 0 && INTVAL (op) < 256")
  47     (match_operand 0 "register_operand")))
  48
  49 ;; Return 1 if OP is a constant or any register.
  50 (define_predicate "reg_or_cint_operand"
  51   (ior (match_operand 0 "register_operand")
  52        (match_operand 0 "const_int_operand")))
  53
  54 ;; Return 1 if the operand is a valid second operand to an add insn.
  55 (define_predicate "add_operand"
  56   (if_then_else (match_code "const_int")
  57     (match_test "CONST_OK_FOR_LETTER_P (INTVAL (op), 'K')
  58                  || CONST_OK_FOR_LETTER_P (INTVAL (op), 'L')")
  59     (match_operand 0 "register_operand")))
  60
  61 ;; Return 1 if the operand is a valid second operand to a
  62 ;; sign-extending add insn.
  63 (define_predicate "sext_add_operand"
  64   (if_then_else (match_code "const_int")
  65     (match_test "CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')
  66                  || CONST_OK_FOR_LETTER_P (INTVAL (op), 'O')")
  67     (match_operand 0 "register_operand")))
  68
  69 ;; Return 1 if the operand is a non-symbolic constant operand that
  70 ;; does not satisfy add_operand.
  71 (define_predicate "non_add_const_operand"
  72   (and (match_code "const_int,const_double,const_vector")
  73        (not (match_operand 0 "add_operand"))))
  74
  75 ;; Return 1 if the operand is a non-symbolic, non-zero constant operand.
  76 (define_predicate "non_zero_const_operand"
  77   (and (match_code "const_int,const_double,const_vector")
  78        (match_test "op != CONST0_RTX (mode)")))
  79
  80 ;; Return 1 if OP is the constant 4 or 8.
  81 (define_predicate "const48_operand"
  82   (and (match_code "const_int")
  83        (match_test "INTVAL (op) == 4 || INTVAL (op) == 8")))
  84
  85 ;; Return 1 if OP is a valid first operand to an AND insn.
  86 (define_predicate "and_operand"
  87   (if_then_else (match_code "const_int")
  88     (match_test "(unsigned HOST_WIDE_INT) INTVAL (op) < 0x100
  89                  || (unsigned HOST_WIDE_INT) ~ INTVAL (op) < 0x100
  90                  || zap_mask (INTVAL (op))")
  91     (if_then_else (match_code "const_double")
  92       (match_test "GET_MODE (op) == VOIDmode
  93                    && zap_mask (CONST_DOUBLE_LOW (op))
  94                    && zap_mask (CONST_DOUBLE_HIGH (op))")
  95       (match_operand 0 "register_operand"))))
  96
  97 ;; Return 1 if OP is a valid first operand to an IOR or XOR insn.
  98 (define_predicate "or_operand"
  99   (if_then_else (match_code "const_int")
 100     (match_test "(unsigned HOST_WIDE_INT) INTVAL (op) < 0x100
 101                  || (unsigned HOST_WIDE_INT) ~ INTVAL (op) < 0x100")
 102     (match_operand 0 "register_operand")))
 103
 104 ;; Return 1 if OP is a constant that is the width, in bits, of an integral
 105 ;; mode not larger than DImode.
 106 (define_predicate "mode_width_operand"
 107   (match_code "const_int")
 108 {
 109   HOST_WIDE_INT i = INTVAL (op);
 110   return i == 8 || i == 16 || i == 32 || i == 64;
 111 })
 112
 113 ;; Return 1 if OP is a constant that is a mask of ones of width of an
 114 ;; integral machine mode not larger than DImode.
 115 (define_predicate "mode_mask_operand"
 116   (match_code "const_int,const_double")
 117 {
 118   if (GET_CODE (op) == CONST_INT)
 119     {
 120       HOST_WIDE_INT value = INTVAL (op);
 121
 122       if (value == 0xff)
 123         return 1;
 124       if (value == 0xffff)
 125         return 1;
 126       if (value == 0xffffffff)
 127         return 1;
 128       if (value == -1)
 129         return 1;
 130     }
 131   else if (HOST_BITS_PER_WIDE_INT == 32 && GET_CODE (op) == CONST_DOUBLE)
 132     {
 133       if (CONST_DOUBLE_LOW (op) == 0xffffffff && CONST_DOUBLE_HIGH (op) == 0)
 134         return 1;
 135     }
 136   return 0;
 137 })
 138
 139 ;; Return 1 if OP is a multiple of 8 less than 64.
 140 (define_predicate "mul8_operand"
 141   (match_code "const_int")
 142 {
 143   unsigned HOST_WIDE_INT i = INTVAL (op);
 144   return i < 64 && i % 8 == 0;
 145 })
 146
 147 ;; Return 1 if OP is a hard floating-point register.
 148 (define_predicate "hard_fp_register_operand"
 149   (match_operand 0 "register_operand")
 150 {
 151   if (GET_CODE (op) == SUBREG)
 152     op = SUBREG_REG (op);
 153   return REGNO_REG_CLASS (REGNO (op)) == FLOAT_REGS;
 154 })
 155
 156 ;; Return 1 if OP is a hard general register.
 157 (define_predicate "hard_int_register_operand"
 158   (match_operand 0 "register_operand")
 159 {
 160   if (GET_CODE (op) == SUBREG)
 161     op = SUBREG_REG (op);
 162   return REGNO_REG_CLASS (REGNO (op)) == GENERAL_REGS;
 163 })
 164
 165 ;; Return 1 if OP is something that can be reloaded into a register;
 166 ;; if it is a MEM, it need not be valid.
 167 (define_predicate "some_operand"
 168   (ior (match_code "reg,mem,const_int,const_double,const_vector,
 169                     label_ref,symbol_ref,const,high")
 170        (and (match_code "subreg")
 171             (match_test "some_operand (SUBREG_REG (op), VOIDmode)"))))
 172
 173 ;; Likewise, but don't accept constants.
 174 (define_predicate "some_ni_operand"
 175   (ior (match_code "reg,mem")
 176        (and (match_code "subreg")
 177             (match_test "some_ni_operand (SUBREG_REG (op), VOIDmode)"))))
 178
 179 ;; Return 1 if OP is a valid operand for the source of a move insn.
 180 (define_predicate "input_operand"
 181   (match_code "label_ref,symbol_ref,const,high,reg,subreg,mem,
 182                const_double,const_vector,const_int")
 183 {
 184   switch (GET_CODE (op))
 185     {
 186     case LABEL_REF:
 187     case SYMBOL_REF:
 188     case CONST:
 189       if (TARGET_EXPLICIT_RELOCS)
 190         {
 191           /* We don't split symbolic operands into something unintelligable
 192              until after reload, but we do not wish non-small, non-global
 193              symbolic operands to be reconstructed from their high/lo_sum
 194              form.  */
 195           return (small_symbolic_operand (op, mode)
 196                   || global_symbolic_operand (op, mode)
 197                   || gotdtp_symbolic_operand (op, mode)
 198                   || gottp_symbolic_operand (op, mode));
 199         }
 200
 201       /* This handles both the Windows/NT and OSF cases.  */
 202       return mode == ptr_mode || mode == DImode;
 203
 204     case HIGH:
 205       return (TARGET_EXPLICIT_RELOCS
 206               && local_symbolic_operand (XEXP (op, 0), mode));
 207
 208     case REG:
 209       return 1;
 210
 211     case SUBREG:
 212       if (register_operand (op, mode))
 213         return 1;
 214       /* ... fall through ...  */
 215     case MEM:
 216       return ((TARGET_BWX || (mode != HImode && mode != QImode))
 217               && general_operand (op, mode));
 218
 219     case CONST_DOUBLE:
 220       return op == CONST0_RTX (mode);
 221
 222     case CONST_VECTOR:
 223       if (reload_in_progress || reload_completed)
 224         return alpha_legitimate_constant_p (op);
 225       return op == CONST0_RTX (mode);
 226
 227     case CONST_INT:
 228       if (mode == QImode || mode == HImode)
 229         return true;
 230       if (reload_in_progress || reload_completed)
 231         return alpha_legitimate_constant_p (op);
 232       return add_operand (op, mode);
 233
 234     default:
 235       gcc_unreachable ();
 236     }
 237   return 0;
 238 })
 239
 240 ;; Return 1 if OP is a SYMBOL_REF for a function known to be in this
 241 ;; file, and in the same section as the current function.
 242
 243 (define_predicate "samegp_function_operand"
 244   (match_code "symbol_ref")
 245 {
 246   /* Easy test for recursion.  */
 247   if (op == XEXP (DECL_RTL (current_function_decl), 0))
 248     return true;
 249
 250   /* Functions that are not local can be overridden, and thus may
 251      not share the same gp.  */
 252   if (! SYMBOL_REF_LOCAL_P (op))
 253     return false;
 254
 255   /* If -msmall-data is in effect, assume that there is only one GP
 256      for the module, and so any local symbol has this property.  We
 257      need explicit relocations to be able to enforce this for symbols
 258      not defined in this unit of translation, however.  */
 259   if (TARGET_EXPLICIT_RELOCS && TARGET_SMALL_DATA)
 260     return true;
 261
 262   /* Functions that are not external are defined in this UoT,
 263      and thus must share the same gp.  */
 264   return ! SYMBOL_REF_EXTERNAL_P (op);
 265 })
 266
 267 ;; Return 1 if OP is a SYMBOL_REF for which we can make a call via bsr.
 268 (define_predicate "direct_call_operand"
 269   (match_operand 0 "samegp_function_operand")
 270 {
 271   tree op_decl, cfun_sec, op_sec;
 272
 273   /* If profiling is implemented via linker tricks, we can't jump
 274      to the nogp alternate entry point.  Note that current_function_profile
 275      would not be correct, since that doesn't indicate if the target
 276      function uses profiling.  */
 277   /* ??? TARGET_PROFILING_NEEDS_GP isn't really the right test,
 278      but is approximately correct for the OSF ABIs.  Don't know
 279      what to do for VMS, NT, or UMK.  */
 280   if (!TARGET_PROFILING_NEEDS_GP && profile_flag)
 281     return false;
 282
 283   /* Must be a function.  In some cases folks create thunks in static
 284      data structures and then make calls to them.  If we allow the
 285      direct call, we'll get an error from the linker about !samegp reloc
 286      against a symbol without a .prologue directive.  */
 287   if (!SYMBOL_REF_FUNCTION_P (op))
 288     return false;
 289
 290   /* Must be "near" so that the branch is assumed to reach.  With
 291      -msmall-text, this is assumed true of all local symbols.  Since
 292      we've already checked samegp, locality is already assured.  */
 293   if (TARGET_SMALL_TEXT)
 294     return true;
 295
 296   /* Otherwise, a decl is "near" if it is defined in the same section.  */
 297   if (flag_function_sections)
 298     return false;
 299
 300   op_decl = SYMBOL_REF_DECL (op);
 301   if (DECL_ONE_ONLY (current_function_decl)
 302       || (op_decl && DECL_ONE_ONLY (op_decl)))
 303     return false;
 304
 305   cfun_sec = DECL_SECTION_NAME (current_function_decl);
 306   op_sec = op_decl ? DECL_SECTION_NAME (op_decl) : NULL;
 307   return ((!cfun_sec && !op_sec)
 308           || (cfun_sec && op_sec
 309               && strcmp (TREE_STRING_POINTER (cfun_sec),
 310                          TREE_STRING_POINTER (op_sec)) == 0));
 311 })
 312
 313 ;; Return 1 if OP is a valid operand for the MEM of a CALL insn.
 314 ;;
 315 ;; For TARGET_ABI_OSF, we want to restrict to R27 or a pseudo.
 316 ;; For TARGET_ABI_UNICOSMK, we want to restrict to registers.
 317
 318 (define_predicate "call_operand"
 319   (if_then_else (match_code "reg")
 320     (match_test "!TARGET_ABI_OSF
 321                  || REGNO (op) == 27 || REGNO (op) > LAST_VIRTUAL_REGISTER")
 322     (and (match_test "!TARGET_ABI_UNICOSMK")
 323          (match_code "symbol_ref"))))
 324
 325 ;; Return true if OP is a LABEL_REF, or SYMBOL_REF or CONST referencing
 326 ;; a (non-tls) variable known to be defined in this file.
 327 (define_predicate "local_symbolic_operand"
 328   (match_code "label_ref,const,symbol_ref")
 329 {
 330   if (GET_CODE (op) == LABEL_REF)
 331     return 1;
 332
 333   if (GET_CODE (op) == CONST
 334       && GET_CODE (XEXP (op, 0)) == PLUS
 335       && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT)
 336     op = XEXP (XEXP (op, 0), 0);
 337
 338   if (GET_CODE (op) != SYMBOL_REF)
 339     return 0;
 340
 341   return SYMBOL_REF_LOCAL_P (op) && !SYMBOL_REF_TLS_MODEL (op);
 342 })
 343
 344 ;; Return true if OP is a SYMBOL_REF or CONST referencing a variable
 345 ;; known to be defined in this file in the small data area.
 346 (define_predicate "small_symbolic_operand"
 347   (match_code "const,symbol_ref")
 348 {
 349   if (! TARGET_SMALL_DATA)
 350     return 0;
 351
 352   if (GET_CODE (op) == CONST
 353       && GET_CODE (XEXP (op, 0)) == PLUS
 354       && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT)
 355     op = XEXP (XEXP (op, 0), 0);
 356
 357   if (GET_CODE (op) != SYMBOL_REF)
 358     return 0;
 359
 360   /* ??? There's no encode_section_info equivalent for the rtl
 361      constant pool, so SYMBOL_FLAG_SMALL never gets set.  */
 362   if (CONSTANT_POOL_ADDRESS_P (op))
 363     return GET_MODE_SIZE (get_pool_mode (op)) <= g_switch_value;
 364
 365   return (SYMBOL_REF_LOCAL_P (op)
 366           && SYMBOL_REF_SMALL_P (op)
 367           && SYMBOL_REF_TLS_MODEL (op) == 0);
 368 })
 369
 370 ;; Return true if OP is a SYMBOL_REF or CONST referencing a variable
 371 ;; not known (or known not) to be defined in this file.
 372 (define_predicate "global_symbolic_operand"
 373   (match_code "const,symbol_ref")
 374 {
 375   if (GET_CODE (op) == CONST
 376       && GET_CODE (XEXP (op, 0)) == PLUS
 377       && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT)
 378     op = XEXP (XEXP (op, 0), 0);
 379
 380   if (GET_CODE (op) != SYMBOL_REF)
 381     return 0;
 382
 383   return !SYMBOL_REF_LOCAL_P (op) && !SYMBOL_REF_TLS_MODEL (op);
 384 })
 385
 386 ;; Returns 1 if OP is a symbolic operand, i.e. a symbol_ref or a label_ref,
 387 ;; possibly with an offset.
 388 (define_predicate "symbolic_operand"
 389   (ior (match_code "symbol_ref,label_ref")
 390        (and (match_code "const")
 391             (match_test "GET_CODE (XEXP (op,0)) == PLUS
 392                          && GET_CODE (XEXP (XEXP (op,0), 0)) == SYMBOL_REF
 393                          && GET_CODE (XEXP (XEXP (op,0), 1)) == CONST_INT"))))
 394
 395 ;; Return true if OP is valid for 16-bit DTP relative relocations.
 396 (define_predicate "dtp16_symbolic_operand"
 397   (and (match_code "const")
 398        (match_test "tls_symbolic_operand_1 (op, 16, UNSPEC_DTPREL)")))
 399
 400 ;; Return true if OP is valid for 32-bit DTP relative relocations.
 401 (define_predicate "dtp32_symbolic_operand"
 402   (and (match_code "const")
 403        (match_test "tls_symbolic_operand_1 (op, 32, UNSPEC_DTPREL)")))
 404
 405 ;; Return true if OP is valid for 64-bit DTP relative relocations.
 406 (define_predicate "gotdtp_symbolic_operand"
 407   (and (match_code "const")
 408        (match_test "tls_symbolic_operand_1 (op, 64, UNSPEC_DTPREL)")))
 409
 410 ;; Return true if OP is valid for 16-bit TP relative relocations.
 411 (define_predicate "tp16_symbolic_operand"
 412   (and (match_code "const")
 413        (match_test "tls_symbolic_operand_1 (op, 16, UNSPEC_TPREL)")))
 414
 415 ;; Return true if OP is valid for 32-bit TP relative relocations.
 416 (define_predicate "tp32_symbolic_operand"
 417   (and (match_code "const")
 418        (match_test "tls_symbolic_operand_1 (op, 32, UNSPEC_TPREL)")))
 419
 420 ;; Return true if OP is valid for 64-bit TP relative relocations.
 421 (define_predicate "gottp_symbolic_operand"
 422   (and (match_code "const")
 423        (match_test "tls_symbolic_operand_1 (op, 64, UNSPEC_TPREL)")))
 424
 425 ;; Return 1 if this memory address is a known aligned register plus
 426 ;; a constant.  It must be a valid address.  This means that we can do
 427 ;; this as an aligned reference plus some offset.
 428 ;;
 429 ;; Take into account what reload will do.  Oh god this is awful.
 430 ;; The horrible comma-operator construct below is to prevent genrecog
 431 ;; from thinking that this predicate accepts REG and SUBREG.  We don't
 432 ;; use recog during reload, so pretending these codes are accepted
 433 ;; pessimizes things a tad.
 434
 435 (define_predicate "aligned_memory_operand"
 436   (ior (match_test "op = resolve_reload_operand (op), 0")
 437        (match_code "mem"))
 438 {
 439   rtx base;
 440
 441   if (MEM_ALIGN (op) >= 32)
 442     return 1;
 443   op = XEXP (op, 0);
 444
 445   /* LEGITIMIZE_RELOAD_ADDRESS creates (plus (plus reg const_hi) const_lo)
 446      sorts of constructs.  Dig for the real base register.  */
 447   if (reload_in_progress
 448       && GET_CODE (op) == PLUS
 449       && GET_CODE (XEXP (op, 0)) == PLUS)
 450     base = XEXP (XEXP (op, 0), 0);
 451   else
 452     {
 453       if (! memory_address_p (mode, op))
 454         return 0;
 455       base = (GET_CODE (op) == PLUS ? XEXP (op, 0) : op);
 456     }
 457
 458   return (GET_CODE (base) == REG && REGNO_POINTER_ALIGN (REGNO (base)) >= 32);
 459 })
 460
 461 ;; Similar, but return 1 if OP is a MEM which is not alignable.
 462
 463 (define_predicate "unaligned_memory_operand"
 464   (ior (match_test "op = resolve_reload_operand (op), 0")
 465        (match_code "mem"))
 466 {
 467   rtx base;
 468
 469   if (MEM_ALIGN (op) >= 32)
 470     return 0;
 471   op = XEXP (op, 0);
 472
 473   /* LEGITIMIZE_RELOAD_ADDRESS creates (plus (plus reg const_hi) const_lo)
 474      sorts of constructs.  Dig for the real base register.  */
 475   if (reload_in_progress
 476       && GET_CODE (op) == PLUS
 477       && GET_CODE (XEXP (op, 0)) == PLUS)
 478     base = XEXP (XEXP (op, 0), 0);
 479   else
 480     {
 481       if (! memory_address_p (mode, op))
 482         return 0;
 483       base = (GET_CODE (op) == PLUS ? XEXP (op, 0) : op);
 484     }
 485
 486   return (GET_CODE (base) == REG && REGNO_POINTER_ALIGN (REGNO (base)) < 32);
 487 })
 488
 489 ;; Return 1 if OP is any memory location.  During reload a pseudo matches.
 490 (define_predicate "any_memory_operand"
 491   (ior (match_code "mem,reg")
 492        (and (match_code "subreg")
 493             (match_test "GET_CODE (SUBREG_REG (op)) == REG"))))
 494
 495 ;; Return 1 if OP is either a register or an unaligned memory location.
 496 (define_predicate "reg_or_unaligned_mem_operand"
 497   (ior (match_operand 0 "register_operand")
 498        (match_operand 0 "unaligned_memory_operand")))
 499
 500 ;; Return 1 is OP is a memory location that is not a reference
 501 ;; (using an AND) to an unaligned location.  Take into account
 502 ;; what reload will do.
 503 (define_predicate "normal_memory_operand"
 504   (ior (match_test "op = resolve_reload_operand (op), 0")
 505        (and (match_code "mem")
 506             (match_test "GET_CODE (XEXP (op, 0)) != AND"))))
 507
 508 ;; Returns 1 if OP is not an eliminable register.
 509 ;;
 510 ;; This exists to cure a pathological failure in the s8addq (et al) patterns,
 511 ;;
 512 ;;      long foo () { long t; bar(); return (long) &t * 26107; }
 513 ;;
 514 ;; which run afoul of a hack in reload to cure a (presumably) similar
 515 ;; problem with lea-type instructions on other targets.  But there is
 516 ;; one of us and many of them, so work around the problem by selectively
 517 ;; preventing combine from making the optimization.
 518
 519 (define_predicate "reg_not_elim_operand"
 520   (match_operand 0 "register_operand")
 521 {
 522   if (GET_CODE (op) == SUBREG)
 523     op = SUBREG_REG (op);
 524   return op != frame_pointer_rtx && op != arg_pointer_rtx;
 525 })
 526
 527 ;; Accept a register, but not a subreg of any kind.  This allows us to
 528 ;; avoid pathological cases in reload wrt data movement common in
 529 ;; int->fp conversion.  */
 530 (define_predicate "reg_no_subreg_operand"
 531   (and (match_code "reg")
 532        (match_operand 0 "register_operand")))
 533
 534 ;; Return 1 if OP is a valid Alpha comparison operator for "cmp" style
 535 ;; instructions.
 536 (define_predicate "alpha_comparison_operator"
 537   (match_code "eq,le,lt,leu,ltu"))
 538
 539 ;; Similarly, but with swapped operands.
 540 (define_predicate "alpha_swapped_comparison_operator"
 541   (match_code "eq,ge,gt,gtu,gtu"))
 542
 543 ;; Return 1 if OP is a valid Alpha comparison operator against zero
 544 ;; for "bcc" style instructions.
 545 (define_predicate "alpha_zero_comparison_operator"
 546   (match_code "eq,ne,le,lt,leu,ltu"))
 547
 548 ;; Return 1 if OP is a signed comparison operation.
 549 (define_predicate "signed_comparison_operator"
 550   (match_code "eq,ne,le,lt,ge,gt"))
 551
 552 ;; Return 1 if OP is a valid Alpha floating point comparison operator.
 553 (define_predicate "alpha_fp_comparison_operator"
 554   (match_code "eq,le,lt,unordered"))
 555
 556 ;; Return 1 if this is a divide or modulus operator.
 557 (define_predicate "divmod_operator"
 558   (match_code "div,mod,udiv,umod"))
 559
 560 ;; Return 1 if this is a float->int conversion operator.
 561 (define_predicate "fix_operator"
 562   (match_code "fix,unsigned_fix"))
 563
 564 ;; Recognize an addition operation that includes a constant.  Used to
 565 ;; convince reload to canonize (plus (plus reg c1) c2) during register
 566 ;; elimination.
 567
 568 (define_predicate "addition_operation"
 569   (and (match_code "plus")
 570        (match_test "register_operand (XEXP (op, 0), mode)
 571                     && GET_CODE (XEXP (op, 1)) == CONST_INT
 572                     && CONST_OK_FOR_LETTER_P (INTVAL (XEXP (op, 1)), 'K')")))
 573
 574 ;; For TARGET_EXPLICIT_RELOCS, we don't obfuscate a SYMBOL_REF to a
 575 ;; small symbolic operand until after reload.  At which point we need
 576 ;; to replace (mem (symbol_ref)) with (mem (lo_sum $29 symbol_ref))
 577 ;; so that sched2 has the proper dependency information.  */
 578 (define_predicate "some_small_symbolic_operand"
 579   (match_code "set,parallel,prefetch,unspec,unspec_volatile")
 580 {
 581   /* Avoid search unless necessary.  */
 582   if (!TARGET_EXPLICIT_RELOCS || !reload_completed)
 583     return false;
 584   return for_each_rtx (&op, some_small_symbolic_operand_int, NULL);
 585 })