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      1 ;; Constraint definitions for Xilinx MicroBlaze processors.
      2 ;; Copyright (C) 2010-2022 Free Software Foundation, Inc.
      3 
      4 ;; Contributed by Michael Eager <eager (a] eagercon.com>.
      5 
      6 ;; This file is part of GCC.
      7 
      8 ;; GCC is free software; you can redistribute it and/or modify
      9 ;; it under the terms of the GNU General Public License as published by
     10 ;; the Free Software Foundation; either version 3, or (at your option)
     11 ;; any later version.
     12 
     13 ;; GCC is distributed in the hope that it will be useful,
     14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
     15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16 ;; GNU General Public License for more details.
     17 
     18 ;; You should have received a copy of the GNU General Public License
     19 ;; along with GCC; see the file COPYING3.  If not see
     20 ;; <http://www.gnu.org/licenses/>. 
     21 
     22 (define_register_constraint "d" "GR_REGS"
     23   "A general register.")
     24 
     25 (define_register_constraint "z" "ST_REGS"
     26   "A status register.")
     27 
     28 ;; Define integer constraints
     29 
     30 (define_constraint "I"
     31   "A signed 16-bit constant."
     32   (and (match_code "const_int")
     33        (match_test "SMALL_OPERAND (ival)")))
     34 
     35 (define_constraint "J"
     36   "Integer zero."
     37   (and (match_code "const_int")
     38        (match_test "ival == 0")))
     39 
     40 (define_constraint "M"
     41   "A constant which needs two instructions to load."
     42   (and (match_code "const_int")
     43        (match_test "LARGE_OPERAND (ival)")))
     44 
     45 (define_constraint "N"
     46   "A constant in the range -65535 to -1 (inclusive)."
     47   (and (match_code "const_int")
     48        (match_test "(unsigned HOST_WIDE_INT) (ival + 0xffff) < 0xffff")))
     49 
     50 (define_constraint "P"
     51   "A constant in the range 1 to 65535 (inclusive)."
     52   (and (match_code "const_int")
     53        (match_test "ival > 0 && ival < 0x10000")))
     54 
     55 ;; Define floating point constraints
     56 
     57 (define_constraint "G"
     58   "Floating-point zero."
     59   (and (match_code "const_double")
     60        (match_test "op == CONST0_RTX (mode)")))
     61 
     62 ;; Define memory constraints
     63 
     64 (define_memory_constraint "R"
     65   "Memory operand which fits in single instruction."
     66   (and (match_code "mem")
     67        (match_test "simple_memory_operand (op, GET_MODE (op))")))
     68 
     69 (define_memory_constraint "T"
     70   "Double word operand."
     71   (and (match_code "mem")
     72        (match_test "double_memory_operand (op, GET_MODE (op))")))
     73 
     74 (define_memory_constraint "Q"
     75   "Memory operand which is a single register."
     76   (and (match_code "mem")
     77        (match_test "GET_CODE ( XEXP (op, 0)) == REG")))
     78