--- boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp.orig	2009-03-02 11:22:16.000000000 -0500
+++ boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp	2009-11-12 07:59:17.000000000 -0500
@@ -30,11 +30,14 @@
 
 inline int32_t compare_and_swap( int32_t * dest_, int32_t compare_, int32_t swap_ )
 {
-    __asm__ __volatile__( "cas %0, %2, %1"
-                        : "+m" (*dest_), "+r" (swap_)
-                        : "r" (compare_)
-                        : "memory" );
-
+    int32_t& ref(*dest_);
+    
+    __asm__ __volatile__( "mov %0, %%g0" "\n\t"
+			  "cas [%%g0], %2, %1"
+			  : "+r" (swap_)
+			  : "r" (&ref), "r" (compare_)
+			  : "%g0", "memory" );
+    
     return swap_;
 }