DBC: Implement InstanceOf.

runtime/vm/intermediate_language_dbc.cc

Index: runtime/vm/intermediate_language_dbc.cc
diff --git a/runtime/vm/intermediate_language_dbc.cc b/runtime/vm/intermediate_language_dbc.cc
index d28bbb2c30aff544c47e1e37ad46739edb5d8879..aef3bb86e2d5b435a6026baa361edf76f6a67611 100644
--- a/runtime/vm/intermediate_language_dbc.cc
+++ b/runtime/vm/intermediate_language_dbc.cc
@@ -32,7 +32,6 @@ DECLARE_FLAG(int, optimization_counter_threshold);
 #define FOR_EACH_UNIMPLEMENTED_INSTRUCTION(M)                                  \
   M(IndirectGoto)                                                              \
   M(LoadCodeUnits)                                                             \
-  M(InstanceOf)                                                                \
   M(LoadUntagged)                                                              \
   M(AllocateUninitializedContext)                                              \
   M(BinaryInt32Op)                                                             \
@@ -179,6 +178,32 @@ DEFINE_UNIMPLEMENTED_EMIT_BRANCH_CODE(RelationalOp)
 DEFINE_UNIMPLEMENTED_EMIT_BRANCH_CODE(EqualityCompare)
 
 
+EMIT_NATIVE_CODE(InstanceOf, 2, Location::SameAsFirstInput(),
+                 LocationSummary::kCall) {
+  SubtypeTestCache& test_cache = SubtypeTestCache::Handle();
+  if (!type().IsVoidType() && type().IsInstantiated()) {
+    test_cache = SubtypeTestCache::New();
+  }
+
+  if (compiler->is_optimizing()) {
+    __ Push(locs()->in(0).reg());  // Value.
+    __ Push(locs()->in(1).reg());  // Instantiator type arguments.
+  }
+
+  __ PushConstant(type());
+  __ PushConstant(test_cache);
+  __ InstanceOf(negate_result() ? 1 : 0);
+  compiler->RecordSafepoint(locs());
+  compiler->AddCurrentDescriptor(RawPcDescriptors::kOther,
+                                 deopt_id(),
+                                 token_pos());
+
+  if (compiler->is_optimizing()) {
+    __ PopLocal(locs()->out(0).reg());
+  }
+}
+
+
 DEFINE_MAKE_LOCATION_SUMMARY(AssertAssignable, 2,
                              Location::SameAsFirstInput(),
                              LocationSummary::kCall);