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m68k: Implement CAS and TAS patterns. 

* config/m68k/m68k.md (UNSPECV_CAS_1, UNSPECV_CAS_2): New.
        (UNSPECV_TAS_1, UNSPECV_TAS_2): New.
        (I): New mode iterator.
        (xz): New mode attribute.
        * config/m68k/sync.md: New file.

From-SVN: r181747
This commit is contained in:
Richard Henderson 2011-11-26 15:59:56 -08:00 committed by Richard Henderson
parent 8b281334a0
commit 7b45b59bc5
3 changed files with 95 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,5 +1,11 @@
2011-11-26 Richard Henderson <rth@redhat.com>
* config/m68k/m68k.md (UNSPECV_CAS_1, UNSPECV_CAS_2): New.
(UNSPECV_TAS_1, UNSPECV_TAS_2): New.
(I): New mode iterator.
(xz): New mode attribute.
* config/m68k/sync.md: New file.
* config/m68k/linux.h (TARGET_INIT_LIBFUNCS): New.
* config/m68k/m68k.c (m68k_init_sync_libfuncs): New.

9
gcc/config/m68k/m68k.md
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@ -124,6 +124,10 @@
(define_constants
[(UNSPECV_BLOCKAGE 0)
(UNSPECV_CAS_1 1)
(UNSPECV_CAS_2 2)
(UNSPECV_TAS_1 3)
(UNSPECV_TAS_2 4)
])
;; Registers by name.
@ -255,6 +259,10 @@
(const_int 0)]
(const_int 1)))
;; Mode macros for integer operations.
(define_mode_iterator I [QI HI SI])
(define_mode_attr sz [(QI "%.b") (HI "%.w") (SI "%.l")])
;; Mode macros for floating point operations.
;; Valid floating point modes
(define_mode_iterator FP [SF DF (XF "TARGET_68881")])
@ -7806,3 +7814,4 @@
[(set_attr "type" "ib")])
(include "cf.md")
(include "sync.md")

80
gcc/config/m68k/sync.md Normal file
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@ -0,0 +1,80 @@
;; GCC machine description for m68k synchronization instructions.
;; Copyright (C) 2011
;; 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_68020 || TARGET_68040"
{
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" "0")
(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_68020 || TARGET_68040"
;; Elide the seq if operands[0] is dead.
"cas<sz> %1,%4,%2\;seq %0")
(define_expand "sync_test_and_setqi"
[(match_operand:QI 0 "register_operand" "")
(match_operand:QI 1 "memory_operand" "")
(match_operand:QI 2 "general_operand" "")]
"!(TARGET_68020 || TARGET_68040)"
{
if (operands[2] != const1_rtx)
FAIL;
emit_insn (gen_sync_test_and_setqi_1 (operands[0], operands[1]));
emit_insn (gen_negqi2 (operands[0], operands[0]));
DONE;
})
(define_insn "sync_test_and_setqi_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))]
"!(TARGET_68020 || TARGET_68040)"
"tas %1\;sne %0")