--- old/src/os_cpu/solaris_sparc/vm/atomic_solaris_sparc.hpp	2017-08-17 19:25:43.773258938 -0400
+++ new/src/os_cpu/solaris_sparc/vm/atomic_solaris_sparc.hpp	2017-08-17 19:25:43.661253198 -0400
@@ -25,8 +25,6 @@
 #ifndef OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP
 #define OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP
 
-#include "runtime/os.hpp"
-
 // Implementation of class atomic
 
 inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
@@ -64,10 +62,6 @@
 extern "C" jint     _Atomic_swap32(jint     exchange_value, volatile jint*     dest);
 extern "C" intptr_t _Atomic_swap64(intptr_t exchange_value, volatile intptr_t* dest);
 
-extern "C" jint     _Atomic_cas32(jint     exchange_value, volatile jint*     dest, jint     compare_value);
-extern "C" intptr_t _Atomic_cas64(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
-extern "C" jlong    _Atomic_casl (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value);
-
 extern "C" jint     _Atomic_add32(jint     inc,       volatile jint*     dest);
 extern "C" intptr_t _Atomic_add64(intptr_t add_value, volatile intptr_t* dest);
 
@@ -97,22 +91,40 @@
   return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
 }
 
-
-inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {
-  return _Atomic_cas32(exchange_value, dest, compare_value);
-}
-
-inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
-  // Return 64 bit value in %o0
-  return _Atomic_cas64((intptr_t)exchange_value, (intptr_t *)dest, (intptr_t)compare_value);
-}
-
-inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
-  return _Atomic_cas64(exchange_value, dest, compare_value);
-}
-
-inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
-  return (void*)cmpxchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest, (intptr_t)compare_value, order);
+// No direct support for cmpxchg of bytes; emulate using int.
+template<>
+struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
+
+template<>
+template<typename T>
+inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
+                                                T volatile* dest,
+                                                T compare_value,
+                                                cmpxchg_memory_order order) const {
+  STATIC_ASSERT(4 == sizeof(T));
+  T rv;
+  __asm__ volatile(
+    " cas    [%2], %3, %0"
+    : "=r" (rv)
+    : "0" (exchange_value), "r" (dest), "r" (compare_value)
+    : "memory");
+  return rv;
+}
+
+template<>
+template<typename T>
+inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
+                                                T volatile* dest,
+                                                T compare_value,
+                                                cmpxchg_memory_order order) const {
+  STATIC_ASSERT(8 == sizeof(T));
+  T rv;
+  __asm__ volatile(
+    " casx   [%2], %3, %0"
+    : "=r" (rv)
+    : "0" (exchange_value), "r" (dest), "r" (compare_value)
+    : "memory");
+  return rv;
 }
 
 #endif // OS_CPU_SOLARIS_SPARC_VM_ATOMIC_SOLARIS_SPARC_HPP