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/*
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __JackAtomic_APPLE__
#define __JackAtomic_APPLE__
#include "JackTypes.h"
#if defined(__ppc__) || defined(__ppc64__)
static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
{
register int result;
asm volatile (
"# CAS \n"
" lwarx r0, 0, %1 \n" // creates a reservation on addr
" cmpw r0, %2 \n" // test value at addr
" bne- 1f \n"
" sync \n" // synchronize instructions
" stwcx. %3, 0, %1 \n" // if the reservation is not altered
// stores the new value at addr
" bne- 1f \n"
" li %0, 1 \n"
" b 2f \n"
"1: \n"
" li %0, 0 \n"
"2: \n"
: "=r" (result)
: "r" (addr), "r" (value), "r" (newvalue)
: "r0"
);
return result;
}
#elif defined(__i386__) || defined(__x86_64__)
#define LOCK "lock ; "
static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
{
register char ret;
__asm__ __volatile__ (
"# CAS \n\t"
LOCK "cmpxchg %2, (%1) \n\t"
"sete %0 \n\t"
: "=a" (ret)
: "c" (addr), "d" (newvalue), "a" (value)
);
return ret;
}
#else
static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
{
return __sync_bool_compare_and_swap ((UInt32*)addr, value, newvalue);
}
#endif
#endif
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