atomicity.h (__exchange_and_add, [...]): Add memory barrier to locking asm.

	* cpu/hppa/atomicity.h (__exchange_and_add, __atomic_add): Add memory
	barrier to locking asm.

From-SVN: r86328

libstdc++-v3/ChangeLog

+2004-08-20  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	* cpu/hppa/atomicity.h (__exchange_and_add, __atomic_add): Add memory
+	barrier to locking asm.
+
 2004-08-20  Paolo Carlini  <pcarlini@suse.de>
 
 	* include/c_std/cmath.tcc (__cmath_power): Revert previous commit:

libstdc++-v3/config/cpu/hppa/atomicity.h

@@ -61,7 +61,8 @@ namespace __gnu_cxx
 			  "nop\n\t"
 			  "b,n .-20"
 			  : "=&r" (tmp)
-			  : "r" (&lock));
+			  : "r" (&lock)
+			  : "memory");
     
     result = *__mem;
     *__mem = result + __val;
@@ -85,7 +86,8 @@ namespace __gnu_cxx
 			  "nop\n\t"
 			  "b,n .-20"
 			  : "=&r" (tmp)
-			  : "r" (&lock));
+			  : "r" (&lock)
+			  : "memory");
     
     *__mem += __val;
     /* Reset lock with PA 2.0 "ordered" store.  */