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;; GCC machine description for m68k synchronization instructions.
;; Copyright (C) 2011-2013 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/>.
(define_expand "atomic_compare_and_swap<mode>"
[(match_operand:QI 0 "register_operand" "") ;; bool success output
(match_operand:I 1 "register_operand" "") ;; oldval output
(match_operand:I 2 "memory_operand" "") ;; memory
(match_operand:I 3 "register_operand" "") ;; expected input
(match_operand:I 4 "register_operand" "") ;; newval input
(match_operand:SI 5 "const_int_operand" "") ;; is_weak
(match_operand:SI 6 "const_int_operand" "") ;; success model
(match_operand:SI 7 "const_int_operand" "")] ;; failure model
"TARGET_CAS"
{
emit_insn (gen_atomic_compare_and_swap<mode>_1
(operands[0], operands[1], operands[2],
operands[3], operands[4]));
emit_insn (gen_negqi2 (operands[0], operands[0]));
DONE;
})
(define_insn "atomic_compare_and_swap<mode>_1"
[(set (match_operand:I 1 "register_operand" "=d")
(unspec_volatile:I
[(match_operand:I 2 "memory_operand" "+m")
(match_operand:I 3 "register_operand" "1")
(match_operand:I 4 "register_operand" "d")]
UNSPECV_CAS_1))
(set (match_dup 2)
(unspec_volatile:I
[(match_dup 2) (match_dup 3) (match_dup 4)]
UNSPECV_CAS_2))
(set (match_operand:QI 0 "register_operand" "=d")
(unspec_volatile:QI
[(match_dup 2) (match_dup 3) (match_dup 4)]
UNSPECV_CAS_2))]
"TARGET_CAS"
;; Elide the seq if operands[0] is dead.
"cas<sz> %1,%4,%2\;seq %0")
(define_expand "atomic_test_and_set"
[(match_operand:QI 0 "register_operand" "") ;; bool success output
(match_operand:QI 1 "memory_operand" "") ;; memory
(match_operand:SI 2 "const_int_operand" "")] ;; model
"ISA_HAS_TAS"
{
rtx t = gen_reg_rtx (QImode);
emit_insn (gen_atomic_test_and_set_1 (t, operands[1]));
t = expand_simple_unop (QImode, NEG, t, operands[0], 0);
if (t != operands[0])
emit_move_insn (operands[0], t);
DONE;
})
(define_insn "atomic_test_and_set_1"
[(set (match_operand:QI 0 "register_operand" "=d")
(unspec_volatile:QI
[(match_operand:QI 1 "memory_operand" "+m")]
UNSPECV_TAS_1))
(set (match_dup 1)
(unspec_volatile:QI [(match_dup 1)] UNSPECV_TAS_2))]
"ISA_HAS_TAS"
"tas %1\;sne %0")
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