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;; Constraint definitions for Renesas / SuperH SH.
;; Copyright (C) 2007, 2008 Free Software Foundation, Inc.
;;
;; 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/>.

;; Overview of uppercase letter constraints:
;; Bxx: miscellaneous constraints
;;  Bsc: SCRATCH - for the scratch register in movsi_ie in the
;;       fldi0 / fldi0 cases
;; Cxx: Constants other than only CONST_INT
;;  Css: signed 16-bit constant, literal or symbolic
;;  Csu: unsigned 16-bit constant, literal or symbolic
;;  Csy: label or symbol
;;  Cpg: non-explicit constants that can be directly loaded into a general
;;       purpose register in PIC code.  like 's' except we don't allow
;;       PIC_ADDR_P
;; IJKLMNOP: CONT_INT constants
;;  Ixx: signed xx bit
;;  J16: 0xffffffff00000000 | 0x00000000ffffffff
;;  Kxx: unsigned xx bit
;;  M: 1
;;  N: 0
;;  P27: 1 | 2 | 8 | 16
;;  Pso: 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128
;;  Psz: ~1 | ~2 | ~4 | ~8 | ~16 | ~32 | ~64 | ~128
;; Q: pc relative load operand
;; Rxx: reserved for exotic register classes.
;; Sxx: extra memory (storage) constraints
;;  Sua: unaligned memory operations
;; W: vector
;; Z: zero in any mode
;;
;; unused CONST_INT constraint letters: LO
;; unused EXTRA_CONSTRAINT letters: D T U Y

;; Register constraints
(define_register_constraint "a" "ALL_REGS"
  "@internal")

(define_register_constraint "b" "TARGET_REGS"
  "Branch target registers.")

(define_register_constraint "c" "FPSCR_REGS"
  "Floating-point status register.")

(define_register_constraint "d" "DF_REGS"
  "Double precision floating-point register.")

(define_register_constraint "e" "TARGET_FMOVD ? NO_REGS : FP_REGS"
  "Floating-point register.")

(define_register_constraint "f" "FP_REGS"
  "Floating-point register.")

(define_register_constraint "k" "SIBCALL_REGS"
  "@internal")

(define_register_constraint "l" "PR_REGS"
  "PR register.")

(define_register_constraint "t" "T_REGS"
  "T register.")

(define_register_constraint "w" "FP0_REGS"
  "Floating-point register 0.")

(define_register_constraint "x" "MAC_REGS"
  "MACH and MACL registers.")

(define_register_constraint "y" "FPUL_REGS"
  "FPUL register.")

(define_register_constraint "z" "R0_REGS"
  "R0 register.")

;; Integer constraints
(define_constraint "I06"
  "A signed 6-bit constant, as used in SHmedia beqi, bnei and xori."
  (and (match_code "const_int")
       (match_test "ival >= -32 && ival <= 31")))

(define_constraint "I08"
  "A signed 8-bit constant, as used in add, sub, etc."
  (and (match_code "const_int")
       (match_test "ival >= -128 && ival <= 127")))

(define_constraint "I10"
  "A signed 10-bit constant, as used in in SHmedia andi, ori."
  (and (match_code "const_int")
       (match_test "ival >= -512 && ival <= 511")))

(define_constraint "I16"
  "A signed 16-bit constant, as used in SHmedia movi."
  (and (match_code "const_int")
       (match_test "ival >= -32768 && ival <= 32767")))

(define_constraint "I20"
  "A signed 20-bit constant, as used in SH2A movi20."
  (and (match_code "const_int")
       (match_test "ival >= -524288 && ival <= 524287")
       (match_test "TARGET_SH2A")))

(define_constraint "I28"
  "A signed 28-bit constant, as used in SH2A movi20s."
  (and (match_code "const_int")
       (match_test "ival >=  -134217728 && ival <= 134217727")
       (match_test "(ival & 255) == 0")
       (match_test "TARGET_SH2A")))
(define_constraint "J16"
  "0xffffffff00000000 or 0x00000000ffffffff."
  (and (match_code "const_int")
       (match_test "CONST_OK_FOR_J16 (ival)")))

(define_constraint "K03"
  "An unsigned 3-bit constant, as used in SH2A bclr, bset, etc."
  (and (match_code "const_int")
       (match_test "ival >= 0 && ival <= 7")))

(define_constraint "K08"
  "An unsigned 8-bit constant, as used in and, or, etc."
  (and (match_code "const_int")
       (match_test "ival >= 0 && ival <= 255")))
 
(define_constraint "K12"
  "An unsigned 8-bit constant, as used in SH2A 12-bit display."
  (and (match_code "const_int")
       (match_test "ival >= 0 && ival <= 4095")))

(define_constraint "K16"
  "An unsigned 16-bit constant, as used in SHmedia shori."
  (and (match_code "const_int")
       (match_test "ival >= 0 && ival <= 65535")))
 
(define_constraint "P27"
  "A constant for shift operand 1,2,8 or 16."
  (and (match_code "const_int")
       (match_test "ival == 1 || ival == 2 || ival == 8 || ival == 16")))

(define_constraint "M"
  "Integer constant 1."
  (and (match_code "const_int")
       (match_test "ival == 1")))

(define_constraint "N"
  "Integer constant 0."
  (and (match_code "const_int")
       (match_test "ival == 0")))

;; Floating-point constraints
(define_constraint "G"
  "Double constant 0."
  (and (match_code "const_double")
       (match_test "fp_zero_operand (op) && fldi_ok ()")))

(define_constraint "H"
  "Double constant 1."
  (and (match_code "const_double")
       (match_test "fp_one_operand (op) && fldi_ok ()")))

;; Extra constraints
(define_constraint "Q"
  "A pc relative load operand."
  (and (match_code "mem")
       (match_test "IS_PC_RELATIVE_LOAD_ADDR_P (XEXP (op, 0))")))

(define_constraint "Bsc"
  "Constraint for selecting FLDI0 or FLDI1 instruction.  If the clobber
   operand is not SCRATCH (i.e. REG) then R0 is probably being used,
   hence mova is being used, hence do not select this pattern."
  (match_code "scratch"))

(define_constraint "Css"
  "A signed 16-bit constant, literal or symbolic."
  (and (match_code "const")
       (match_test "GET_CODE (XEXP (op, 0)) == UNSPEC")
       (match_test "XINT (XEXP (op, 0), 1) == UNSPEC_EXTRACT_S16")))

(define_constraint "Csu"
  "An unsigned 16-bit constant, literal or symbolic."
  (and (match_code "const")
       (match_test "GET_CODE (XEXP (op, 0)) == UNSPEC")
       (match_test "XINT (XEXP (op, 0), 1) == UNSPEC_EXTRACT_U16")))

(define_constraint "Csy"
  "A label or a symbol."
  (ior (match_test "NON_PIC_REFERENCE_P (op)")
       (match_test "PIC_ADDR_P (op)")))

(define_constraint "Z"
  "A zero in any shape or form."
  (match_test "op == CONST0_RTX (GET_MODE (op))"))

(define_constraint "W"
  "Any vector constant we can handle."
  (and (match_code "const_vector")
       (ior (match_test "sh_rep_vec (op, VOIDmode)")
            (match_test "HOST_BITS_PER_WIDE_INT >= 64
                         ? sh_const_vec (op, VOIDmode)
                         : sh_1el_vec (op, VOIDmode)"))))

(define_constraint "Cpg"
  "A non-explicit constant that can be loaded directly into a general
   purpose register.  This is like 's' except we don't allow
   PIC_ADDR_P."
  (match_test "IS_NON_EXPLICIT_CONSTANT_P (op)"))

(define_constraint "Pso"
  "Integer constant with a single bit set in its lower 8-bit."
  (and (match_code "const_int")
       (ior (match_test "ival == 1")
            (match_test "ival == 2")
            (match_test "ival == 4")
            (match_test "ival == 8")
            (match_test "ival == 16")
            (match_test "ival == 32")
            (match_test "ival == 64")
            (match_test "ival == 128"))))

(define_constraint "Psz"
  "Integer constant with a single zero bit in the lower 8-bit."
  (and (match_code "const_int")
       (ior (match_test "~ival == 1")
            (match_test "~ival == 2")
            (match_test "~ival == 4")
            (match_test "~ival == 8")
            (match_test "~ival == 16")
            (match_test "~ival == 32")
            (match_test "~ival == 64")
            (match_test "~ival == 128"))))

(define_memory_constraint "Sr0"
  "@internal"
  (and (match_test "memory_operand (op, GET_MODE (op))")
       (match_test "!refers_to_regno_p (R0_REG, R0_REG + 1, op, (rtx *) 0)")))

(define_memory_constraint "Sua"
  "@internal"
  (and (match_test "memory_operand (op, GET_MODE (op))")
       (match_test "GET_CODE (XEXP (op, 0)) != PLUS")))

(define_memory_constraint "Sbv"
  "A memory reference, as used in SH2A bclr.b, bset.b, etc."
  (and (match_test "MEM_P (op) && GET_MODE (op) == QImode")
       (match_test "REG_P (XEXP (op, 0))")))

(define_memory_constraint "Sbw"
  "A memory reference, as used in SH2A bclr.b, bset.b, etc."
  (and (match_test "MEM_P (op) && GET_MODE (op) == QImode")
       (match_test "GET_CODE (XEXP (op, 0)) == PLUS")
       (match_test "REG_P (XEXP (XEXP (op, 0), 0))")
       (match_test "satisfies_constraint_K12 (XEXP (XEXP (op, 0), 1))")))