* sysdeps/i386/i486/bits/atomic.h: Define

	atomic_compare_and_exchange_val_acq,
	atomic_compare_and_exchange_bool_acq, and atomic_exchange_and_add
	using __sync_* built-ins for gcc >= 4.1.
	* sysdeps/x86_64/bits/atomic.h: Likewise.

2 files changed, 35 insertions, 11 deletions

diff --git a/sysdeps/i386/i486/bits/atomic.h b/sysdeps/i386/i486/bits/atomic.h
index a27734c37e..4577499d58 100644
--- a/sysdeps/i386/i486/bits/atomic.h
+++ b/sysdeps/i386/i486/bits/atomic.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -56,26 +56,33 @@ typedef uintmax_t uatomic_max_t;
 #endif
 
 
-#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
+#if __GNUC_PREREQ (4, 1)
+# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+  __sync_val_compare_and_swap (mem, oldval, newval)
+#  define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+  (! __sync_bool_compare_and_swap (mem, oldval, newval))
+#else
+# define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgb %b2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "q" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
 
-#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
+# define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgw %w2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "r" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
 
-#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgl %2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "r" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
+#endif
 
 
 #define __arch_c_compare_and_exchange_val_8_acq(mem, newval, oldval) \
@@ -240,8 +247,13 @@ typedef uintmax_t uatomic_max_t;
        }								      \
      __result; })
 
-#define atomic_exchange_and_add(mem, value) \
+#if __GNUC_PREREQ (4, 1)
+# define atomic_exchange_and_add(mem, value) \
+  __sync_fetch_and_add (mem, value)
+#else
+# define atomic_exchange_and_add(mem, value) \
   __arch_exchange_and_add_body (LOCK_PREFIX, __arch, mem, value)
+#endif
 
 #define __arch_exchange_and_add_cprefix \
   "cmpl $0, %%gs:%P4\n\tje 0f\n\tlock\n0:\t"
diff --git a/sysdeps/x86_64/bits/atomic.h b/sysdeps/x86_64/bits/atomic.h
index 65d6b02008..80e8a0bccb 100644
--- a/sysdeps/x86_64/bits/atomic.h
+++ b/sysdeps/x86_64/bits/atomic.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -56,34 +56,41 @@ typedef uintmax_t uatomic_max_t;
 #endif
 
 
-#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
+#if __GNUC_PREREQ (4, 1)
+# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+  __sync_val_compare_and_swap (mem, oldval, newval)
+#  define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+  (! __sync_bool_compare_and_swap (mem, oldval, newval))
+#else
+# define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgb %b2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "q" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
 
-#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
+# define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgw %w2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "r" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
 
-#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgl %2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "r" (newval), "m" (*mem), "0" (oldval));	      \
      ret; })
 
-#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
+# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
   ({ __typeof (*mem) ret;						      \
      __asm __volatile (LOCK_PREFIX "cmpxchgq %q2, %1"			      \
 		       : "=a" (ret), "=m" (*mem)			      \
 		       : "r" ((long int) (newval)), "m" (*mem),		      \
 			 "0" ((long int) (oldval)));			      \
      ret; })
+#endif
 
 
 #define __arch_c_compare_and_exchange_val_8_acq(mem, newval, oldval) \
@@ -178,8 +185,13 @@ typedef uintmax_t uatomic_max_t;
 			   "i" (offsetof (tcbhead_t, multiple_threads)));     \
      result; })
 
-#define atomic_exchange_and_add(mem, value) \
+#if __GNUC_PREREQ (4, 1)
+# define atomic_exchange_and_add(mem, value) \
+  __sync_fetch_and_add (mem, value)
+#else
+# define atomic_exchange_and_add(mem, value) \
   __arch_exchange_and_add_body (LOCK_PREFIX, mem, value)
+#endif
 
 #define __arch_exchange_and_add_cprefix \
   "cmpl $0, %%fs:%P4\n\tje 0f\n\tlock\n0:\t"