gcc/config/nios2/constraints.md

   1 ;; Constraint definitions for Altera Nios II.
   2 ;; Copyright (C) 2012-2016 Free Software Foundation, Inc.
   3 ;; Contributed by Chung-Lin Tang <cltang@codesourcery.com>
   4 ;;
   5 ;; This file is part of GCC.
   6 ;;
   7 ;; GCC is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 3, or (at your option)
  10 ;; any later version.
  11 ;;
  12 ;; GCC is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16 ;;
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GCC; see the file COPYING3.  If not see
  19 ;; <http://www.gnu.org/licenses/>.
  20
  21 ;; We use the following constraint letters for constants
  22 ;;
  23 ;;  I: -32768 to 32767
  24 ;;  J: 0 to 65535
  25 ;;  K: $nnnn0000 for some nnnn
  26 ;;  P: Under R2, $nnnnffff or $ffffnnnn for some nnnn
  27 ;;  L: 0 to 31 (for shift counts)
  28 ;;  M: 0
  29 ;;  N: 0 to 255 (for custom instruction numbers)
  30 ;;  O: 0 to 31 (for control register numbers)
  31 ;;  U: -32768 to 32767 under R1, -2048 to 2047 under R2
  32 ;;
  33 ;; We use the following constraint letters for memory constraints
  34 ;;
  35 ;;  v: memory operands for R2 load/store exclusive instructions
  36 ;;  w: memory operands for load/store IO and cache instructions
  37 ;;
  38 ;; We use the following built-in register classes:
  39 ;;
  40 ;;  r: general purpose register (r0..r31)
  41 ;;  m: memory operand
  42 ;;
  43 ;; Plus, we define the following constraint strings:
  44 ;;
  45 ;;  S: symbol that is in the "small data" area
  46
  47 ;; Register constraints
  48
  49 (define_register_constraint "c" "IJMP_REGS"
  50   "A register suitable for an indirect jump.")
  51
  52 (define_register_constraint "j" "SIB_REGS"
  53   "A register suitable for an indirect sibcall.")
  54
  55 ;; Integer constraints
  56
  57 (define_constraint "I"
  58   "A signed 16-bit constant (for arithmetic instructions)."
  59   (and (match_code "const_int")
  60        (match_test "SMALL_INT (ival)")))
  61
  62 (define_constraint "J"
  63   "An unsigned 16-bit constant (for logical instructions)."
  64   (and (match_code "const_int")
  65        (match_test "SMALL_INT_UNSIGNED (ival)")))
  66
  67 (define_constraint "K"
  68   "An unsigned 16-bit high constant (for logical instructions)."
  69   (and (match_code "const_int")
  70        (match_test "UPPER16_INT (ival)")))
  71
  72 (define_constraint "L"
  73   "An unsigned 5-bit constant (for shift counts)."
  74   (and (match_code "const_int")
  75        (match_test "ival >= 0 && ival <= 31")))
  76
  77 (define_constraint "M"
  78   "Integer zero."
  79   (and (match_code "const_int")
  80        (match_test "ival == 0")))
  81
  82 (define_constraint "N"
  83   "An unsigned 8-bit constant (for custom instruction codes)."
  84   (and (match_code "const_int")
  85        (match_test "ival >= 0 && ival <= 255")))
  86
  87 (define_constraint "O"
  88   "An unsigned 5-bit constant (for control register numbers)."
  89   (and (match_code "const_int")
  90        (match_test "ival >= 0 && ival <= 31")))
  91
  92 (define_constraint "P"
  93   "An immediate operand for R2 andchi/andci instructions."
  94   (and (match_code "const_int")
  95        (match_test "TARGET_ARCH_R2 && ANDCLEAR_INT (ival)")))
  96
  97 (define_constraint "S"
  98   "An immediate stored in small data, accessible by GP."
  99   (match_test "gprel_constant_p (op)"))
 100
 101 (define_constraint "T"
 102   "A constant unspec offset representing a relocation."
 103   (match_test "nios2_unspec_reloc_p (op)"))
 104
 105 (define_constraint "U"
 106   "A 12-bit or 16-bit constant (for RDPRS and DCACHE)."
 107   (and (match_code "const_int")
 108        (if_then_else (match_test "TARGET_ARCH_R2")
 109                      (match_test "SMALL_INT12 (ival)")
 110                      (match_test "SMALL_INT (ival)"))))
 111
 112 (define_memory_constraint "v"
 113   "A memory operand suitable for R2 load/store exclusive instructions."
 114   (match_operand 0 "ldstex_memory_operand"))
 115
 116 (define_memory_constraint "w"
 117   "A memory operand suitable for load/store IO and cache instructions."
 118   (match_operand 0 "ldstio_memory_operand"))