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src/cpu/x86/vm/x86_32.ad

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@@ -227,10 +227,15 @@
 reg_class fp_dbl_notreg0( FPR2L,FPR2H, FPR3L,FPR3H, FPR4L,FPR4H,
                           FPR5L,FPR5H, FPR6L,FPR6H, FPR7L,FPR7H );
 
 %}
 
+source_hpp %{
+#if INCLUDE_ALL_GCS
+#include "shenandoahBarrierSetAssembler_x86.hpp"
+#endif
+%}
 
 //----------SOURCE BLOCK-------------------------------------------------------
 // This is a block of C++ code which provides values, functions, and
 // definitions necessary in the rest of the architecture description
 source_hpp %{

@@ -7297,10 +7302,11 @@
               enc_flags_ne_to_boolean(res) );
   ins_pipe( pipe_cmpxchg );
 %}
 
 instruct compareAndSwapP( rRegI res,  pRegP mem_ptr, eAXRegP oldval, eCXRegP newval, eFlagsReg cr) %{
+  predicate(!UseShenandoahGC || !ShenandoahCASBarrier || n->in(3)->in(1)->bottom_type() == TypePtr::NULL_PTR);
   match(Set res (CompareAndSwapP mem_ptr (Binary oldval newval)));
   effect(KILL cr, KILL oldval);
   format %{ "CMPXCHG [$mem_ptr],$newval\t# If EAX==[$mem_ptr] Then store $newval into [$mem_ptr]\n\t"
             "MOV    $res,0\n\t"
             "JNE,s  fail\n\t"

@@ -7308,10 +7314,32 @@
           "fail:" %}
   ins_encode( enc_cmpxchg(mem_ptr), enc_flags_ne_to_boolean(res) );
   ins_pipe( pipe_cmpxchg );
 %}
 
+instruct compareAndSwapP_shenandoah(rRegI res,
+                                    memory mem_ptr,
+                                    eRegP tmp1, eRegP tmp2,
+                                    eAXRegP oldval, eCXRegP newval,
+                                    eFlagsReg cr)
+%{
+  predicate(UseShenandoahGC && ShenandoahCASBarrier && n->in(3)->in(1)->bottom_type() != TypePtr::NULL_PTR);
+  match(Set res (CompareAndSwapP mem_ptr (Binary oldval newval)));
+  effect(TEMP tmp1, TEMP tmp2, KILL cr, KILL oldval);
+
+  format %{ "shenandoah_cas_oop $mem_ptr,$newval" %}
+
+  ins_encode %{
+    ShenandoahBarrierSetAssembler::bsasm()->cmpxchg_oop(&_masm,
+      $res$$Register, $mem_ptr$$Address, $oldval$$Register, $newval$$Register,
+      false, // swap
+      $tmp1$$Register, $tmp2$$Register
+    );
+  %}
+  ins_pipe( pipe_cmpxchg );
+%}
+
 instruct compareAndSwapI( rRegI res, pRegP mem_ptr, eAXRegI oldval, eCXRegI newval, eFlagsReg cr) %{
   match(Set res (CompareAndSwapI mem_ptr (Binary oldval newval)));
   effect(KILL cr, KILL oldval);
   format %{ "CMPXCHG [$mem_ptr],$newval\t# If EAX==[$mem_ptr] Then store $newval into [$mem_ptr]\n\t"
             "MOV    $res,0\n\t"
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