fix: o174 CompareAndExchangeN === o168 o169 o23 o268 [[ o175 o176 o181 o262 o264 o267 o219 4 8 12 18 42 ]]

Author: offamitkumar

src/hotspot/cpu/s390/s390.ad

@@ -5560,6 +5560,38 @@ instruct compareAndSwapN_bool(iRegP mem_ptr, rarg5RegN oldval, iRegN_P2N newval,
   ins_pipe(pipe_class_dummy);
 %}
 
+instruct compareAndExchangeN(iRegN res, iRegP mem_ptr, rarg5RegN oldval, iRegN_P2N newval, flagsReg cr) %{
+  match(Set res (CompareAndExchangeN mem_ptr (Binary oldval newval)));
+  predicate(n->as_LoadStore()->barrier_data() == 0);
+  effect(TEMP_DEF res, USE mem_ptr, USE_KILL oldval, KILL cr);
+  format %{ "$res = CompareAndExchangeN $oldval,$newval,$mem_ptr" %}
+  ins_encode %{
+    Register Rcomp = reg_to_register_object($oldval$$reg);
+    Register Rnew  = reg_to_register_object($newval$$reg);
+    Register Raddr = reg_to_register_object($mem_ptr$$reg);
+    Register Rres  = reg_to_register_object($res$$reg);
+    __ z_lr(Rres, Rcomp);
+    __ z_cs(Rres, Rnew, 0, Raddr);
+  %}
+  ins_pipe(pipe_class_dummy);
+%}
+
+instruct compareAndExchangeP(iRegP res, iRegP mem_ptr, rarg5RegP oldval, iRegP_N2P newval, flagsReg cr) %{
+  match(Set res (CompareAndExchangeP mem_ptr (Binary oldval newval)));
+  predicate(n->as_LoadStore()->barrier_data() == 0);
+  effect(TEMP_DEF res, USE mem_ptr, USE_KILL oldval, KILL cr);
+  format %{ "$res = CompareAndExchangeP $oldval,$newval,$mem_ptr" %}
+  ins_encode %{
+    Register Rcomp = reg_to_register_object($oldval$$reg);
+    Register Rnew  = reg_to_register_object($newval$$reg);
+    Register Raddr = reg_to_register_object($mem_ptr$$reg);
+    Register Rres  = reg_to_register_object($res$$reg);
+    __ z_lgr(Rres, Rcomp);
+    __ z_csg(Rres, Rnew, 0, Raddr);
+  %}
+  ins_pipe(pipe_class_dummy);
+%}
+
 //----------Atomic operations on memory (GetAndSet*, GetAndAdd*)---------------
 
 // Exploit: direct memory arithmetic