// Copyright (c) 2005-2019 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Support for class TinyLock
.section .text
.align 16
// unsigned int __TBB_machine_trylockbyte( byte& flag );
// r32 = address of flag
.proc __TBB_machine_trylockbyte#
.global __TBB_machine_trylockbyte#
ADDRESS_OF_FLAG=r32
RETCODE=r8
FLAG=r9
BUSY=r10
SCRATCH=r11
__TBB_machine_trylockbyte:
ld1.acq FLAG=[ADDRESS_OF_FLAG]
mov BUSY=1
mov RETCODE=0
;;
cmp.ne p6,p0=0,FLAG
mov ar.ccv=r0
(p6) br.ret.sptk.many b0
;;
cmpxchg1.acq SCRATCH=[ADDRESS_OF_FLAG],BUSY,ar.ccv // Try to acquire lock
;;
cmp.eq p6,p0=0,SCRATCH
;;
(p6) mov RETCODE=1
br.ret.sptk.many b0
.endp __TBB_machine_trylockbyte#
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