83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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Copyright (C) 2004-2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __JackAtomic_APPLE__
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#define __JackAtomic_APPLE__
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#include "JackTypes.h"
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#include <cassert>
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#if defined(__ppc__) || defined(__ppc64__)
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static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
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{
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register int result;
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asm volatile (
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"# CAS \n"
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" lwarx r0, 0, %1 \n" // creates a reservation on addr
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" cmpw r0, %2 \n" // test value at addr
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" bne- 1f \n"
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" sync \n" // synchronize instructions
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" stwcx. %3, 0, %1 \n" // if the reservation is not altered
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// stores the new value at addr
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" bne- 1f \n"
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" li %0, 1 \n"
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" b 2f \n"
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"1: \n"
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" li %0, 0 \n"
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"2: \n"
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: "=r" (result)
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: "r" (addr), "r" (value), "r" (newvalue)
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: "r0"
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);
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return result;
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}
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#elif defined(__i386__) || defined(__x86_64__)
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#define LOCK "lock ; "
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static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
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{
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register char ret;
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__asm__ __volatile__ (
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"# CAS \n\t"
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LOCK "cmpxchg %2, (%1) \n\t"
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"sete %0 \n\t"
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: "=a" (ret)
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: "c" (addr), "d" (newvalue), "a" (value)
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);
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return ret;
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}
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#else
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#include <stdio.h>
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static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
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{
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// Assert pointer is 32-bit aligned
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assert(((long)addr & (sizeof(int)-1)) == 0);
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return __sync_bool_compare_and_swap ((UInt32*)addr, value, newvalue);
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}
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#endif
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#endif
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