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diff --git a/gcc/config/picochip/constraints.md b/gcc/config/picochip/constraints.md
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+;; GCC machine description for picochip
+;; Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+;; Contributed by picoChip Designs Ltd (http://www.picochip.com)
+;; Maintained by Daniel Towner (dant@picochip.com) and Hariharan
+;; Sandanagobalane (hariharan@picochip.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_constraint "I"
+ "4-bits signed value"
+ (and (match_code "const_int")
+      (match_test " ival >= -8 && ival< 8")))
+
+(define_constraint "J"
+ "4-bits unsigned value"
+ (and (match_code "const_int")
+      (match_test "ival>=0 && ival < 16")))
+
+(define_constraint "K"
+ "8-bits signed value"
+ (and (match_code "const_int")
+      (match_test " ival >= -128 && ival < 128")))
+
+(define_constraint "M"
+ "4-bits magnitude"
+ (and (match_code "const_int")
+      (match_test " abs(ival) < 16")))
+
+(define_constraint "N"
+ "10-bits signed value"
+ (and (match_code "const_int")
+      (match_test "ival >= -512 && ival < 512")))
+
+(define_constraint "O"
+ "16-bits signed value"
+ (and (match_code "const_int")
+      (match_test " ival >= -32768 && ival < 32768 ")))
+
+(define_constraint "a"
+ "See if this is an absolute address in memory"
+  (and (match_code "mem")
+       (match_test "picochip_absolute_memory_operand(op,mode) == 1")))
+
+(define_register_constraint "k" "FRAME_REGS"
+  "Frame regs")
+(define_register_constraint "f" "PTR_REGS"
+  "Pointer regs")
+(define_register_constraint "t" "TWIN_REGS"
+  "Twin regs")
+