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;; Constraint definitions for Altera Nios II.
;; Copyright (C) 2012-2014 Free Software Foundation, Inc.
;; Contributed by Chung-Lin Tang <cltang@codesourcery.com>
;;
;; This file is part of GCC.
;;
;; GCC is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; GCC is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GCC; see the file COPYING3. If not see
;; <http://www.gnu.org/licenses/>.
;; We use the following constraint letters for constants
;;
;; I: -32768 to -32767
;; J: 0 to 65535
;; K: $nnnn0000 for some nnnn
;; L: 0 to 31 (for shift counts)
;; M: 0
;; N: 0 to 255 (for custom instruction numbers)
;; O: 0 to 31 (for control register numbers)
;;
;; We use the following built-in register classes:
;;
;; r: general purpose register (r0..r31)
;; m: memory operand
;;
;; Plus, we define the following constraint strings:
;;
;; S: symbol that is in the "small data" area
;; Register constraints
(define_register_constraint "j" "SIB_REGS"
"A register suitable for an indirect sibcall.")
;; Integer constraints
(define_constraint "I"
"A signed 16-bit constant (for arithmetic instructions)."
(and (match_code "const_int")
(match_test "SMALL_INT (ival)")))
(define_constraint "J"
"An unsigned 16-bit constant (for logical instructions)."
(and (match_code "const_int")
(match_test "SMALL_INT_UNSIGNED (ival)")))
(define_constraint "K"
"An unsigned 16-bit high constant (for logical instructions)."
(and (match_code "const_int")
(match_test "UPPER16_INT (ival)")))
(define_constraint "L"
"An unsigned 5-bit constant (for shift counts)."
(and (match_code "const_int")
(match_test "ival >= 0 && ival <= 31")))
(define_constraint "M"
"Integer zero."
(and (match_code "const_int")
(match_test "ival == 0")))
(define_constraint "N"
"An unsigned 8-bit constant (for custom instruction codes)."
(and (match_code "const_int")
(match_test "ival >= 0 && ival <= 255")))
(define_constraint "O"
"An unsigned 5-bit constant (for control register numbers)."
(and (match_code "const_int")
(match_test "ival >= 0 && ival <= 31")))
(define_constraint "S"
"An immediate stored in small data, accessible by GP."
(and (match_code "symbol_ref")
(match_test "nios2_symbol_ref_in_small_data_p (op)")))
(define_constraint "T"
"A constant unspec offset representing a relocation."
(match_test "nios2_unspec_reloc_p (op)"))
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