VM: Improve receiver class check in polymorphic inlining.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4703 matching lines @@
 
 void CheckSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                         kDeoptCheckSmi);
   __ testq(value, Immediate(kSmiTagMask));
   __ j(NOT_ZERO, deopt);
 }
 
 
+LocationSummary* CheckClassIdInstr::MakeLocationSummary(bool opt) const {
+  const intptr_t kNumInputs = 2;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  summary->set_in(0, Location::RequiresRegister());
+  summary->set_in(1, Location::RegisterOrSmiConstant(right()));
+  return summary;
+}
+
+
+void CheckClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  Register left = locs()->in(0).reg();
+  Location right = locs()->in(1);
+  Label* deopt = compiler->AddDeoptStub(deopt_id(), kDeoptCheckClass);
+  if (right.IsRegister()) {
+    __ cmpq(left, right.reg());
+  } else {
+    ASSERT(right.IsConstant());
+    const Object& right_const = Smi::Cast(right.constant());
+    __ CompareImmediate(
+        left, Immediate(reinterpret_cast<int64_t>(right_const.raw())), PP);
+  }
+  __ j(NOT_ZERO, deopt);
+}
+
+
 LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(kLengthPos, Location::RegisterOrSmiConstant(length()));
   locs->set_in(kIndexPos, Location::RegisterOrSmiConstant(index()));
   return locs;
 }
 
@@ skipping 356 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64