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;; Constraints definitions belonging to the gcc backend for IBM S/390.

;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.

;; Written by Wolfgang Gellerich, using code and information found in

;; files s390.md, s390.h, and s390.c.

;;

;; 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

;; .

;;

;; Special constraints for s/390 machine description:

;;

;;    a -- Any address register from 1 to 15.

;;    b -- Memory operand whose address is a symbol reference or a symbol

;;         reference + constant which can be proven to be naturally aligned.

;;    c -- Condition code register 33.

;;    d -- Any register from 0 to 15.

;;    f -- Floating point registers.

;;    t -- Access registers 36 and 37.

;;    C -- A signed 8-bit constant (-128..127)

;;    D -- An unsigned 16-bit constant (0..65535)

;;    G -- Const double zero operand

;;    I -- An 8-bit constant (0..255).

;;    J -- A 12-bit constant (0..4095).

;;    K -- A 16-bit constant (-32768..32767).

;;    L -- Value appropriate as displacement.

;;         (0..4095) for short displacement

;;         (-524288..524287) for long displacement

;;    M -- Constant integer with a value of 0x7fffffff.

;;    N -- Multiple letter constraint followed by 4 parameter letters.

;;         0..9,x:  number of the part counting from most to least significant

;;         H,Q:     mode of the part

;;         D,S,H:   mode of the containing operand

;;         0,F:     value of the other parts (F - all bits set)

;;

;;         The constraint matches if the specified part of a constant

;;         has a value different from its other parts.  If the letter x

;;         is specified instead of a part number, the constraint matches

;;         if there is any single part with non-default value.

;;    O -- Multiple letter constraint followed by 1 parameter.

;;         s:  Signed extended immediate value (-2G .. 2G-1).

;;         p:  Positive extended immediate value (0 .. 4G-1).

;;         n:  Negative extended immediate value (-4G+1 .. -1).

;;         These constraints do not accept any operand if the machine does

;;         not provide the extended-immediate facility.

;;    P -- Any integer constant that can be loaded without literal pool.

;;    Q -- Memory reference without index register and with short displacement.

;;    R -- Memory reference with index register and short displacement.

;;    S -- Memory reference without index register but with long displacement.

;;    T -- Memory reference with index register and long displacement.

;;    A -- Multiple letter constraint followed by Q, R, S, or T:

;;         Offsettable memory reference of type specified by second letter.

;;    B -- Multiple letter constraint followed by Q, R, S, or T:

;;         Memory reference of the type specified by second letter that

;;         does *not* refer to a literal pool entry.

;;    U -- Pointer with short displacement. (deprecated - use ZQZR)

;;    W -- Pointer with long displacement. (deprecated - use ZSZT)

;;    Y -- Shift count operand.

;;    ZQ -- Pointer without index register and with short displacement.

;;    ZR -- Pointer with index register and short displacement.

;;    ZS -- Pointer without index register but with long displacement.

;;    ZT -- Pointer with index register and long displacement.

;;

;;

;;

;;  Register constraints.

;;

(define_register_constraint "a"

  "ADDR_REGS"

  "Any address register from 1 to 15.")

(define_register_constraint "c"

  "CC_REGS"

  "Condition code register 33")

(define_register_constraint "d"

  "GENERAL_REGS"

  "Any register from 0 to 15")

(define_register_constraint "f"

  "FP_REGS"

  "Floating point registers")

(define_register_constraint "t"

  "ACCESS_REGS"

  "@internal

   Access registers 36 and 37")

;;

;;  General constraints for constants.

;;

(define_constraint "C"

  "@internal

   An 8-bit signed immediate constant (-128..127)"

  (and (match_code "const_int")

       (match_test "ival >= -128 && ival <= 127")))

(define_constraint "D"

  "An unsigned 16-bit constant (0..65535)"

  (and (match_code "const_int")

       (match_test "ival >= 0 && ival <= 65535")))

(define_constraint "G"

  "@internal

   Const double zero operand"

   (and (match_code "const_double")

        (match_test "s390_float_const_zero_p (op)")))

(define_constraint "I"

  "An 8-bit constant (0..255)"

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT) ival <= 255")))

(define_constraint "J"

  "A 12-bit constant (0..4095)"

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT) ival <= 4095")))

(define_constraint "K"

  "A 16-bit constant (-32768..32767)"

  (and (match_code "const_int")

       (match_test "ival >= -32768 && ival <= 32767")))

(define_constraint "L"

  "Value appropriate as displacement.

      (0..4095) for short displacement

      (-524288..524287) for long displacement"

  (and (match_code "const_int")

       (match_test "TARGET_LONG_DISPLACEMENT ?

              (ival >= -524288 && ival <= 524287)

            : (ival >= 0 && ival <= 4095)")))

(define_constraint "M"

  "Constant integer with a value of 0x7fffffff"

  (and (match_code "const_int")

       (match_test "ival == 2147483647")))

(define_constraint "P"

  "@internal

   Any integer constant that can be loaded without literal pool"

   (and (match_code "const_int")

        (match_test "legitimate_reload_constant_p (GEN_INT (ival))")))

(define_address_constraint "Y"

  "Shift count operand"

;; Simply check for the basic form of a shift count.  Reload will

;; take care of making sure we have a proper base register.

  (match_test "s390_decompose_shift_count (op, NULL, NULL)"  ))

;;    N -- Multiple letter constraint followed by 4 parameter letters.

;;         0..9,x:  number of the part counting from most to least significant

;;         H,Q:     mode of the part

;;         D,S,H:   mode of the containing operand

;;         0,F:     value of the other parts (F = all bits set)

;;

;;         The constraint matches if the specified part of a constant

;;         has a value different from its other parts.  If the letter x

;;         is specified instead of a part number, the constraint matches

;;         if there is any single part with non-default value.

;;

;; The following patterns define only those constraints that are actually

;; used in s390.md.  If you need an additional one, simply add it in the

;; obvious way.  Function s390_N_constraint_str is ready to handle all

;; combinations.

;;

(define_constraint "NxQS0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"xQS0\", ival)")))

(define_constraint "NxQD0"

  "@internal"

   (and (match_code "const_int")

        (match_test "s390_N_constraint_str (\"xQD0\", ival)")))

(define_constraint "N3HD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"3HD0\", ival)")))

(define_constraint "N2HD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"2HD0\", ival)")))

(define_constraint "N1SD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1SD0\", ival)")))

(define_constraint "N1HS0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1HS0\", ival)")))

(define_constraint "N1HD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1HD0\", ival)")))

(define_constraint "N0SD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0SD0\", ival)")))

(define_constraint "N0HS0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0HS0\", ival)")))

(define_constraint "N0HD0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0HD0\", ival)")))

(define_constraint "NxQDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"xQDF\", ival)")))

(define_constraint "N1SDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1SDF\", ival)")))

(define_constraint "N0SDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0SDF\", ival)")))

(define_constraint "N3HDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"3HDF\", ival)")))

(define_constraint "N2HDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"2HDF\", ival)")))

(define_constraint "N1HDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1HDF\", ival)")))

(define_constraint "N0HDF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0HDF\", ival)")))

(define_constraint "N0HSF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"0HSF\", ival)")))

(define_constraint "N1HSF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"1HSF\", ival)")))

(define_constraint "NxQSF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"xQSF\", ival)")))

(define_constraint "NxQHF"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"xQHF\", ival)")))

(define_constraint "NxQH0"

  "@internal"

  (and (match_code "const_int")

       (match_test "s390_N_constraint_str (\"xQH0\", ival)")))

;;

;; Double-letter constraints starting with O follow.

;;

(define_constraint "Os"

  "@internal

   Signed extended immediate value (-2G .. 2G-1).

   This constraint will only match if the machine provides

   the extended-immediate facility."

  (and (match_code "const_int")

       (match_test "s390_O_constraint_str ('s', ival)")))

(define_constraint "Op"

  "@internal

   Positive extended immediate value (0 .. 4G-1).

   This constraint will only match if the machine provides

   the extended-immediate facility."

  (and (match_code "const_int")

       (match_test "s390_O_constraint_str ('p', ival)")))

(define_constraint "On"

  "@internal

   Negative extended immediate value (-4G+1 .. -1).

   This constraint will only match if the machine provides

   the extended-immediate facility."

  (and (match_code "const_int")

       (match_test "s390_O_constraint_str ('n', ival)")))

;;

;; Memory constraints follow.

;;

(define_memory_constraint "Q"

  "Memory reference without index register and with short displacement"

  (match_test "s390_mem_constraint (\"Q\", op)"))

(define_memory_constraint "R"

  "Memory reference with index register and short displacement"

  (match_test "s390_mem_constraint (\"R\", op)"))

(define_memory_constraint "S"

  "Memory reference without index register but with long displacement"

  (match_test "s390_mem_constraint (\"S\", op)"))

(define_memory_constraint "T"

  "Memory reference with index register and long displacement"

  (match_test "s390_mem_constraint (\"T\", op)"))

(define_memory_constraint "b"

  "Memory reference whose address is a naturally aligned symbol reference."

  (match_test "MEM_P (op)

               && s390_check_symref_alignment (XEXP (op, 0),

                                               GET_MODE_SIZE (GET_MODE (op)))"))

(define_memory_constraint "e"

  "Matches all memory references available on the current architecture

level.  This constraint will never be used and using it in an inline

assembly is *always* a bug since there is no instruction accepting all

those addresses.  It just serves as a placeholder for a generic memory

constraint."

  (match_test "strict_memory_address_p (GET_MODE (op), op)"))

; This defines 'm' as normal memory constraint.  This is only possible

; since the standard memory constraint is re-defined in s390.h using

; the TARGET_MEM_CONSTRAINT macro.

(define_memory_constraint "m"

  "Matches the most general memory address for pre-z10 machines."

  (match_test "s390_mem_constraint (\"R\", op)

               || s390_mem_constraint (\"T\", op)"))

(define_memory_constraint "AQ"

  "@internal

   Offsettable memory reference without index register and with short displacement"

  (match_test "s390_mem_constraint (\"AQ\", op)"))

(define_memory_constraint "AR"

  "@internal

   Offsettable memory reference with index register and short displacement"

  (match_test "s390_mem_constraint (\"AR\", op)"))

(define_memory_constraint "AS"

  "@internal

   Offsettable memory reference without index register but with long displacement"

  (match_test "s390_mem_constraint (\"AS\", op)"))

(define_memory_constraint "AT"

  "@internal

   Offsettable memory reference with index register and long displacement"

  (match_test "s390_mem_constraint (\"AT\", op)"))

(define_constraint "BQ"

  "@internal

   Memory reference without index register and with short

   displacement that does *not* refer to a literal pool entry."

  (match_test "s390_mem_constraint (\"BQ\", op)"))

(define_constraint "BR"

  "@internal

   Memory reference with index register and short displacement that

   does *not* refer to a literal pool entry. "

  (match_test "s390_mem_constraint (\"BR\", op)"))

(define_constraint "BS"

  "@internal

   Memory reference without index register but with long displacement

   that does *not* refer to a literal pool entry. "

  (match_test "s390_mem_constraint (\"BS\", op)"))

(define_constraint "BT"

  "@internal

   Memory reference with index register and long displacement that

   does *not* refer to a literal pool entry. "

  (match_test "s390_mem_constraint (\"BT\", op)"))

(define_address_constraint "U"

  "Pointer with short displacement. (deprecated - use ZQZR)"

  (match_test "s390_mem_constraint (\"U\", op)"))

(define_address_constraint "W"

  "Pointer with long displacement. (deprecated - use ZSZT)"

  (match_test "s390_mem_constraint (\"W\", op)"))

(define_address_constraint "ZQ"

  "Pointer without index register and with short displacement."

  (match_test "s390_mem_constraint (\"ZQ\", op)"))

(define_address_constraint "ZR"

  "Pointer with index register and short displacement."

  (match_test "s390_mem_constraint (\"ZR\", op)"))

(define_address_constraint "ZS"

  "Pointer without index register but with long displacement."

  (match_test "s390_mem_constraint (\"ZS\", op)"))

(define_address_constraint "ZT"

  "Pointer with index register and long displacement."

  (match_test "s390_mem_constraint (\"ZT\", op)"))