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47 lines
2.0 KiB
ArmAsm
47 lines
2.0 KiB
ArmAsm
// Copyright 2005-2014 Intel Corporation. All Rights Reserved.
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//
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// This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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// you can redistribute it and/or modify it under the terms of the GNU General Public License
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// version 2 as published by the Free Software Foundation. Threading Building Blocks is
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// distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details. You should have received a copy of
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// the GNU General Public License along with Threading Building Blocks; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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// As a special exception, you may use this file as part of a free software library without
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// restriction. Specifically, if other files instantiate templates or use macros or inline
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// functions from this file, or you compile this file and link it with other files to produce
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// an executable, this file does not by itself cause the resulting executable to be covered
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// by the GNU General Public License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General Public License.
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// Support for class TinyLock
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.section .text
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.align 16
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// unsigned int __TBB_machine_trylockbyte( byte& flag );
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// r32 = address of flag
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.proc __TBB_machine_trylockbyte#
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.global __TBB_machine_trylockbyte#
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ADDRESS_OF_FLAG=r32
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RETCODE=r8
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FLAG=r9
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BUSY=r10
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SCRATCH=r11
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__TBB_machine_trylockbyte:
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ld1.acq FLAG=[ADDRESS_OF_FLAG]
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mov BUSY=1
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mov RETCODE=0
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;;
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cmp.ne p6,p0=0,FLAG
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mov ar.ccv=r0
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(p6) br.ret.sptk.many b0
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;;
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cmpxchg1.acq SCRATCH=[ADDRESS_OF_FLAG],BUSY,ar.ccv // Try to acquire lock
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;;
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cmp.eq p6,p0=0,SCRATCH
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;;
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(p6) mov RETCODE=1
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br.ret.sptk.many b0
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.endp __TBB_machine_trylockbyte#
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