Use __sync_bool_compare_and_swap in x86 locks.h.

2011-05-31  H.J. Lu  <hongjiu.lu@intel.com>

	PR libgcj/49193
	* configure.host (sysdeps_dir): Set to i386 for x86_64.

	* sysdep/i386/locks.h (compare_and_swap): Call
	__sync_bool_compare_and_swap.
	(release_set): Call write_barrier ().

	* sysdep/x86-64/locks.h: Removed.

From-SVN: r174471

1 files changed, 21 insertions, 33 deletions

diff --git a/libjava/sysdep/i386/locks.h b/libjava/sysdep/i386/locks.h
index 9d130b0..7b99f0b 100644
--- a/libjava/sysdep/i386/locks.h
+++ b/libjava/sysdep/i386/locks.h
@@ -1,6 +1,6 @@
 /* locks.h - Thread synchronization primitives. X86/x86-64 implementation.
 
-   Copyright (C) 2002  Free Software Foundation
+   Copyright (C) 2002, 2011  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -23,19 +23,25 @@ compare_and_swap(volatile obj_addr_t *addr,
 		 obj_addr_t old,
 		 obj_addr_t new_val)
 {
-  char 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;
+  return __sync_bool_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/x86-64, the hardware ensures that reads are properly ordered.
+inline static void
+read_barrier()
+{
+}
+
+// Ensure that prior stores to memory are completed with respect to other
+// processors.
+inline static void
+write_barrier()
+{
+  /* x86-64/X86 does not reorder writes. We just need to ensure that
+     gcc also doesn't.  */
+  __asm__ __volatile__(" " : : : "memory");
 }
 
 // Set *addr to new_val with release semantics, i.e. making sure
@@ -46,7 +52,7 @@ compare_and_swap(volatile obj_addr_t *addr,
 inline static void
 release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
 {
-  __asm__ __volatile__(" " : : : "memory");
+  write_barrier ();
   *(addr) = new_val;
 }
 
@@ -60,22 +66,4 @@ compare_and_swap_release(volatile obj_addr_t *addr,
 {
   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/x86-64, the hardware ensures that reads are properly ordered.
-inline static void
-read_barrier()
-{
-}
-
-// Ensure that prior stores to memory are completed with respect to other
-// processors.
-inline static void
-write_barrier()
-{
-  /* x86-64/X86 does not reorder writes. We just need to ensure that
-     gcc also doesn't.  */
-  __asm__ __volatile__(" " : : : "memory");
-}
 #endif