gcc/common.md

   1 ;; Common GCC machine description file, shared by all targets.
   2 ;; Copyright (C) 2014-2019 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 3, 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 COPYING3.  If not see
  18 ;; <http://www.gnu.org/licenses/>.  */
  19
  20 (define_register_constraint "r" "GENERAL_REGS"
  21   "Matches any general register.")
  22
  23 (define_memory_constraint "TARGET_MEM_CONSTRAINT"
  24   "Matches any valid memory."
  25   (and (match_code "mem")
  26        (match_test "memory_address_addr_space_p (GET_MODE (op), XEXP (op, 0),
  27                                                  MEM_ADDR_SPACE (op))")))
  28
  29 (define_memory_constraint "o"
  30   "Matches an offsettable memory reference."
  31   (and (match_code "mem")
  32        (match_test "offsettable_nonstrict_memref_p (op)")))
  33
  34 ;; "V" matches TARGET_MEM_CONSTRAINTs that are rejected by "o".
  35 ;; This means that it is not a memory constraint in the usual sense,
  36 ;; since reloading the address into a base register would make the
  37 ;; address offsettable.
  38 (define_constraint "V"
  39   "Matches a non-offsettable memory reference."
  40   (and (match_code "mem")
  41        (match_test "memory_address_addr_space_p (GET_MODE (op), XEXP (op, 0),
  42                                                  MEM_ADDR_SPACE (op))")
  43        (not (match_test "offsettable_nonstrict_memref_p (op)"))))
  44
  45 ;; Like "V", this is not a memory constraint, since reloading the address
  46 ;; into a base register would cause it not to match.
  47 (define_constraint "<"
  48   "Matches a pre-dec or post-dec operand."
  49   (and (match_code "mem")
  50        (ior (match_test "GET_CODE (XEXP (op, 0)) == PRE_DEC")
  51             (match_test "GET_CODE (XEXP (op, 0)) == POST_DEC"))))
  52
  53 ;; See the comment for "<".
  54 (define_constraint ">"
  55   "Matches a pre-inc or post-inc operand."
  56   (and (match_code "mem")
  57        (ior (match_test "GET_CODE (XEXP (op, 0)) == PRE_INC")
  58             (match_test "GET_CODE (XEXP (op, 0)) == POST_INC"))))
  59
  60 (define_address_constraint "p"
  61   "Matches a general address."
  62   (match_test "address_operand (op, VOIDmode)"))
  63
  64 (define_constraint "i"
  65   "Matches a general integer constant."
  66   (and (match_test "CONSTANT_P (op)")
  67        (match_test "!flag_pic || LEGITIMATE_PIC_OPERAND_P (op)")))
  68
  69 (define_constraint "s"
  70   "Matches a symbolic integer constant."
  71   (and (match_test "CONSTANT_P (op)")
  72        (match_test "!CONST_SCALAR_INT_P (op)")
  73        (match_test "!flag_pic || LEGITIMATE_PIC_OPERAND_P (op)")))
  74
  75 (define_constraint "n"
  76   "Matches a non-symbolic integer constant."
  77   (and (match_test "CONST_SCALAR_INT_P (op)")
  78        (match_test "!flag_pic || LEGITIMATE_PIC_OPERAND_P (op)")))
  79
  80 (define_constraint "E"
  81   "Matches a floating-point constant."
  82   (ior (match_test "CONST_DOUBLE_AS_FLOAT_P (op)")
  83        (match_test "GET_CODE (op) == CONST_VECTOR
  84                     && GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_FLOAT")))
  85
  86 ;; There is no longer a distinction between "E" and "F".
  87 (define_constraint "F"
  88   "Matches a floating-point constant."
  89   (ior (match_test "CONST_DOUBLE_AS_FLOAT_P (op)")
  90        (match_test "GET_CODE (op) == CONST_VECTOR
  91                     && GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_FLOAT")))
  92
  93 (define_constraint "X"
  94   "Matches anything."
  95   (match_test "true"))