1 files changed, 89 insertions, 0 deletions
diff --git a/gcc/config/nios2/constraints.md b/gcc/config/nios2/constraints.md
new file mode 100644
index 00000000000..dbae54320e9
--- /dev/null
+++ b/gcc/config/nios2/constraints.md
@@ -0,0 +1,89 @@
+;; 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)"))