DBC: CheckClassInstr

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..3b3d44018743cab8bf9e096dbf1ef43a77f33ba8 100644
--- a/runtime/vm/intermediate_language_dbc.cc
+++ b/runtime/vm/intermediate_language_dbc.cc
@@ -105,7 +105,6 @@ DECLARE_FLAG(int, optimization_counter_threshold);
   M(UnboxInteger32)                                                            \
   M(CheckedSmiOp)                                                              \
   M(CheckArrayBound)                                                           \
-  M(CheckClass)                                                                \
   M(TestSmi)                                                                   \
   M(RelationalOp)                                                              \
   M(EqualityCompare)                                                           \
@@ -945,6 +944,34 @@ EMIT_NATIVE_CODE(CheckClassId, 1) {
 }
 
 
+EMIT_NATIVE_CODE(CheckClass, 1) {
+  const Register value = locs()->in(0).reg();
+  if (IsNullCheck()) {
+    ASSERT(DeoptIfNull() || DeoptIfNotNull());
+    __ CheckNull(value, DeoptIfNull() ? 1 : 0);
+    compiler->EmitDeopt(deopt_id(),
+                        ICData::kDeoptCheckClass,
+                        licm_hoisted_ ? ICData::kHoisted : 0);
+    return;
+  }
+
+  ASSERT((unary_checks().GetReceiverClassIdAt(0) != kSmiCid) ||
+         (unary_checks().NumberOfChecks() > 1));
+  const intptr_t ic_data = __ AddConstant(unary_checks());
+  if (IsDenseSwitch()) {
+    ASSERT(cids_[0] < cids_[cids_.length() - 1]);
+    __ PushConstant(Smi::Handle(Smi::New(cids_[0])));
+    __ PushConstant(Smi::Handle(Smi::New(ComputeCidMask())));
+    __ CheckDenseSwitchTOS(value, ic_data);
+  } else {
+    __ CheckForCid(value, ic_data);
+  }
+  compiler->EmitDeopt(deopt_id(),
+                  ICData::kDeoptCheckClass,
+                  licm_hoisted_ ? ICData::kHoisted : 0);
+}
+
+
 EMIT_NATIVE_CODE(BinarySmiOp, 2, Location::RequiresRegister()) {
   const Register left = locs()->in(0).reg();
   const Register right = locs()->in(1).reg();