1 /* src/vm/jit/i386/atomic.hpp - i386 atomic instructions
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
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10 published by the Free Software Foundation; either version 2, or (at
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
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20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
35 * An atomic compare and swap for 32-bit integer values.
37 * @param p Pointer to memory address.
38 * @param oldval Old value to be expected.
39 * @param newval New value to be stored.
41 * @return value of the memory location before the store
43 inline static uint32_t Atomic_cas_32(volatile uint32_t *p, uint32_t oldval, uint32_t newval)
47 __asm__ __volatile__ ("lock; cmpxchgl %2, %1"
48 : "=a" (result), "=m" (*p)
49 : "r" (newval), "m" (*p), "0" (oldval));
56 * An atomic compare and swap for 64-bit integer values.
58 * @param p Pointer to memory address.
59 * @param oldval Old value to be expected.
60 * @param newval New value to be stored.
62 * @return value of the memory location before the store
64 inline static uint64_t Atomic_cas_64(volatile uint64_t *p, uint64_t oldval, uint64_t newval)
68 __asm__ __volatile__ ("lock; cmpxchgq %2, %1"
69 : "=a" (result), "=m" (*p)
70 : "r" (newval), "m" (*p), "0" (oldval));
77 * An atomic compare and swap for pointer values.
79 * @param p Pointer to memory address.
80 * @param oldval Old value to be expected.
81 * @param newval New value to be stored.
83 * @return value of the memory location before the store
85 inline static void* Atomic_cas_ptr(volatile void** p, void* oldval, void* newval)
87 return (void*) Atomic_cas_64((volatile uint64_t*) p, (uint64_t) oldval, (uint64_t) newval);
94 inline static void Atomic_mb(void)
96 __asm__ __volatile__ ("mfence" : : : "memory");
100 #define STORE_ORDER_BARRIER() __asm__ __volatile__ ("" : : : "memory");
101 #define MEMORY_BARRIER_AFTER_ATOMIC() /* nothing */
103 #endif /* _ATOMIC_HPP */
107 * These are local overrides for various environment variables in Emacs.
108 * Please do not remove this and leave it at the end of the file, where
109 * Emacs will automagically detect them.
110 * ---------------------------------------------------------------------
113 * indent-tabs-mode: t
117 * vim:noexpandtab:sw=4:ts=4: