-// locks.h - Thread synchronization primitives. X86 implementation.
+/* locks.h - Thread synchronization primitives. X86/x86-64 implementation.
-/* Copyright (C) 2002 Free Software Foundation
+ Copyright (C) 2002 Free Software Foundation
This file is part of libgcj.
// cannot execute before the compare_and_swap finishes.
inline static bool
compare_and_swap(volatile obj_addr_t *addr,
- obj_addr_t old,
- obj_addr_t new_val)
+ obj_addr_t old,
+ obj_addr_t new_val)
{
char result;
- __asm__ __volatile__("lock; cmpxchgl %2, %0; setz %1"
- : "=m"(*addr), "=q"(result)
+#ifdef __x86_64__
+ __asm__ __volatile__("lock; cmpxchgq %2, %0; setz %1"
+ : "=m"(*(addr)), "=q"(result)
: "r" (new_val), "a"(old), "m"(*addr)
: "memory");
+#else
+ __asm__ __volatile__("lock; cmpxchgl %2, %0; setz %1"
+ : "=m"(*addr), "=q"(result)
+ : "r" (new_val), "a"(old), "m"(*addr)
+ : "memory");
+#endif
return (bool) result;
}
// Set *addr to new_val with release semantics, i.e. making sure
// that prior loads and stores complete before this
// assignment.
-// On X86, the hardware shouldn't reorder reads and writes,
+// On X86/x86-64, the hardware shouldn't reorder reads and writes,
// so we just have to convince gcc not to do it either.
inline static void
release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
// implementation can be the same.
inline static bool
compare_and_swap_release(volatile obj_addr_t *addr,
- obj_addr_t old,
- obj_addr_t new_val)
+ obj_addr_t old,
+ obj_addr_t new_val)
{
return compare_and_swap(addr, old, new_val);
}
// Ensure that subsequent instructions do not execute on stale
// data that was loaded from memory before the barrier.
-// On X86, the hardware ensures that reads are properly ordered.
+// On X86/x86-64, the hardware ensures that reads are properly ordered.
inline static void
read_barrier()
{
inline static void
write_barrier()
{
- // X86 does not reorder writes. We just need to ensure that gcc also doesn't.
+ /* x86-64/X86 does not reorder writes. We just need to ensure that
+ gcc also doesn't. */
__asm__ __volatile__(" " : : : "memory");
}
#endif