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+;; Constraint definitions for Xilinx MicroBlaze processors.
+;; Copyright 2010 Free Software Foundation, Inc.
+
+;; Contributed by Michael Eager <eager@eagercon.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/>. 
+
+(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))")))