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;; Constraint definitions for RS6000

;; Copyright (C) 2006, 2007, 2009, 2010 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

;; .

;; Available constraint letters: "e", "k", "u", "A", "B", "C", "D"

;; Register constraints

(define_register_constraint "f" "rs6000_constraints[RS6000_CONSTRAINT_f]"

  "@internal")

(define_register_constraint "d" "rs6000_constraints[RS6000_CONSTRAINT_d]"

  "@internal")

(define_register_constraint "b" "BASE_REGS"

  "@internal")

(define_register_constraint "h" "SPECIAL_REGS"

  "@internal")

(define_register_constraint "q" "MQ_REGS"

  "@internal")

(define_register_constraint "c" "CTR_REGS"

  "@internal")

(define_register_constraint "l" "LINK_REGS"

  "@internal")

(define_register_constraint "v" "ALTIVEC_REGS"

  "@internal")

(define_register_constraint "x" "CR0_REGS"

  "@internal")

(define_register_constraint "y" "CR_REGS"

  "@internal")

(define_register_constraint "z" "CA_REGS"

  "@internal")

;; Use w as a prefix to add VSX modes

;; vector double (V2DF)

(define_register_constraint "wd" "rs6000_constraints[RS6000_CONSTRAINT_wd]"

  "@internal")

;; vector float (V4SF)

(define_register_constraint "wf" "rs6000_constraints[RS6000_CONSTRAINT_wf]"

  "@internal")

;; scalar double (DF)

(define_register_constraint "ws" "rs6000_constraints[RS6000_CONSTRAINT_ws]"

  "@internal")

;; any VSX register

(define_register_constraint "wa" "rs6000_constraints[RS6000_CONSTRAINT_wa]"

  "@internal")

;; Altivec style load/store that ignores the bottom bits of the address

(define_memory_constraint "wZ"

  "Indexed or indirect memory operand, ignoring the bottom 4 bits"

  (match_operand 0 "altivec_indexed_or_indirect_operand"))

;; Integer constraints

(define_constraint "I"

  "A signed 16-bit constant"

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT) (ival + 0x8000) < 0x10000")))

(define_constraint "J"

  "high-order 16 bits nonzero"

  (and (match_code "const_int")

       (match_test "(ival & (~ (unsigned HOST_WIDE_INT) 0xffff0000)) == 0")))

(define_constraint "K"

  "low-order 16 bits nonzero"

  (and (match_code "const_int")

       (match_test "(ival & (~ (HOST_WIDE_INT) 0xffff)) == 0")))

(define_constraint "L"

  "signed 16-bit constant shifted left 16 bits"

  (and (match_code "const_int")

       (match_test "((ival & 0xffff) == 0

                      && (ival >> 31 == -1 || ival >> 31 == 0))")))

(define_constraint "M"

  "constant greater than 31"

  (and (match_code "const_int")

       (match_test "ival > 31")))

(define_constraint "N"

  "positive constant that is an exact power of two"

  (and (match_code "const_int")

       (match_test "ival > 0 && exact_log2 (ival) >= 0")))

(define_constraint "O"

  "constant zero"

  (and (match_code "const_int")

       (match_test "ival == 0")))

(define_constraint "P"

  "constant whose negation is signed 16-bit constant"

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT) ((- ival) + 0x8000) < 0x10000")))

;; Floating-point constraints

(define_constraint "G"

  "Constant that can be copied into GPR with two insns for DF/DI

   and one for SF."

  (and (match_code "const_double")

       (match_test "num_insns_constant (op, mode)

                    == (mode == SFmode ? 1 : 2)")))

(define_constraint "H"

  "DF/DI constant that takes three insns."

  (and (match_code "const_double")

       (match_test "num_insns_constant (op, mode) == 3")))

;; Memory constraints

(define_memory_constraint "es"

  "A ``stable'' memory operand; that is, one which does not include any

automodification of the base register.  Unlike @samp{m}, this constraint

can be used in @code{asm} statements that might access the operand

several times, or that might not access it at all."

  (and (match_code "mem")

       (match_test "GET_RTX_CLASS (GET_CODE (XEXP (op, 0))) != RTX_AUTOINC")))

(define_memory_constraint "Q"

  "Memory operand that is an offset from a register (it is usually better

to use @samp{m} or @samp{es} in @code{asm} statements)"

  (and (match_code "mem")

       (match_test "GET_CODE (XEXP (op, 0)) == REG")))

(define_memory_constraint "Y"

  "Indexed or word-aligned displacement memory operand"

  (match_operand 0 "word_offset_memref_operand"))

(define_memory_constraint "Z"

  "Memory operand that is an indexed or indirect from a register (it is

usually better to use @samp{m} or @samp{es} in @code{asm} statements)"

  (match_operand 0 "indexed_or_indirect_operand"))

;; Address constraints

(define_address_constraint "a"

  "Indexed or indirect address operand"

  (match_operand 0 "indexed_or_indirect_address"))

(define_constraint "R"

  "AIX TOC entry"

  (match_test "legitimate_constant_pool_address_p (op, QImode, false)"))

;; General constraints

(define_constraint "S"

  "Constant that can be placed into a 64-bit mask operand"

  (match_operand 0 "mask64_operand"))

(define_constraint "T"

  "Constant that can be placed into a 32-bit mask operand"

  (match_operand 0 "mask_operand"))

(define_constraint "U"

  "V.4 small data reference"

  (and (match_test "DEFAULT_ABI == ABI_V4")

       (match_operand 0 "small_data_operand")))

(define_constraint "t"

  "AND masks that can be performed by two rldic{l,r} insns

   (but excluding those that could match other constraints of anddi3)"

  (and (and (and (match_operand 0 "mask64_2_operand")

                 (match_test "(fixed_regs[CR0_REGNO]

                              || !logical_operand (op, DImode))"))

            (not (match_operand 0 "mask_operand")))

       (not (match_operand 0 "mask64_operand"))))

(define_constraint "W"

  "vector constant that does not require memory"

  (match_operand 0 "easy_vector_constant"))

(define_constraint "j"

  "Zero vector constant"

  (match_test "op == const0_rtx || op == CONST0_RTX (GET_MODE (op))"))