gcc/config/or1k/constraints.md

   1 ;; Constraint definitions for OpenRISC
   2 ;; Copyright (C) 2018-2024 Free Software Foundation, Inc.
   3 ;; Contributed by Stafford Horne
   4
   5 ;; This file is part of GCC.
   6
   7 ;; GCC is free software; you can redistribute it and/or modify it
   8 ;; under the terms of the GNU General Public License as published
   9 ;; by the Free Software Foundation; either version 3, or (at your
  10 ;; option) any later version.
  11
  12 ;; GCC is distributed in the hope that it will be useful, but WITHOUT
  13 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 ;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15 ;; 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 ;; -------------------------------------------------------------------------
  22 ;; Constraints
  23 ;; -------------------------------------------------------------------------
  24
  25 ; We use:
  26 ;  c - sibcall registers
  27 ;  d - double pair base registers (excludes r0, r30 and r31 which overflow)
  28 ;  t - got address registers (excludes LR (r9) which is clobbered by set_got)
  29 ;  I - constant signed 16-bit
  30 ;  K - constant unsigned 16-bit
  31 ;  M - constant signed 16-bit shifted left 16-bits (l.movhi)
  32 ;  O - constant zero
  33
  34 (define_register_constraint "c" "SIBCALL_REGS"
  35   "Registers which can hold a sibling call address")
  36
  37 (define_register_constraint "d" "DOUBLE_REGS"
  38   "Registers which can be used for double reg pairs.")
  39
  40 (define_register_constraint "t" "GOT_REGS"
  41   "Registers which can be used to store the Global Offset Table (GOT) address.")
  42
  43 ;; Immediates
  44 (define_constraint "I"
  45   "A signed 16-bit immediate in the range -32768 to 32767."
  46   (and (match_code "const_int")
  47        (match_test "IN_RANGE (ival, -32768, 32767)")))
  48
  49 (define_constraint "K"
  50   "An unsigned 16-bit immediate in the range 0 to 0xffff."
  51   (and (match_code "const_int")
  52        (match_test "IN_RANGE (ival, 0, 65535)")))
  53
  54 (define_constraint "M"
  55   "A shifted signed 16-bit constant suitable for l.movhi."
  56   (and (match_code "const_int")
  57        (match_test "(ival & 0xffff) == 0
  58                     && (ival >> 31 == -1 || ival >> 31 == 0)")))
  59
  60 (define_constraint "O"
  61   "The constant zero"
  62   (and (match_code "const_int")
  63        (match_test "ival == 0")))