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;; Constraint definitions for Xilinx MicroBlaze processors.

;; Copyright 2010 Free Software Foundation, Inc.

;; Contributed by Michael Eager .

;; 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

;; .

(define_register_constraint "d" "GR_REGS"

  "A general register.")

(define_register_constraint "z" "ST_REGS"

  "A status register.")

;; Define integer constraints

(define_constraint "I"

  "A signed 16-bit constant."

  (and (match_code "const_int")

       (match_test "SMALL_OPERAND (ival)")))

(define_constraint "J"

  "Integer zero."

  (and (match_code "const_int")

       (match_test "ival == 0")))

(define_constraint "M"

  "A constant which needs two instructions to load."

  (and (match_code "const_int")

       (match_test "LARGE_OPERAND (ival)")))

(define_constraint "N"

  "A constant in the range -65535 to -1 (inclusive)."

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT) (ival + 0xffff) < 0xffff")))

(define_constraint "P"

  "A constant in the range 1 to 65535 (inclusive)."

  (and (match_code "const_int")

       (match_test "ival > 0 && ival < 0x10000")))

;; Define floating point constraints

(define_constraint "G"

  "Floating-point zero."

  (and (match_code "const_double")

       (match_test "op == CONST0_RTX (mode)")))

;; Define memory constraints

(define_memory_constraint "R"

  "Memory operand which fits in single instruction."

  (and (match_code "mem")

       (match_test "simple_memory_operand (op, GET_MODE (op))")))

(define_memory_constraint "T"

  "Double word operand."

  (and (match_code "mem")

       (match_test "double_memory_operand (op, GET_MODE (op))")))