Implement proposed new identity spec.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, 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/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 1092 matching lines @@
                    token_pos,
                    &StubCode::CallStaticFunctionLabel(),
                    PcDescriptors::kFuncCall,
                    locs);
   AddStaticCallTarget(function);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitEqualityRegConstCompare(Register reg,
-                                                    const Object& obj) {
+                                                    const Object& obj,
+                                                    bool needs_number_check) {
+  if (needs_number_check) {
+    if (!obj.IsMint() && !obj.IsDouble() && !obj.IsBigint()) {
+      needs_number_check = false;
+    }
+  }
+
   if (obj.IsSmi() && (Smi::Cast(obj).Value() == 0)) {
+    ASSERT(!needs_number_check);
     __ testq(reg, reg);
+    return;
+  }
+
+  if (needs_number_check) {
+    __ pushq(reg);
+    __ PushObject(obj);
+    __ call(&StubCode::IdenticalWithNumberCheckLabel());
+    __ popq(reg);  // Discard constant.
+    __ popq(reg);  // Restore 'reg'.
+    return;
+  }
+
+  __ CompareObject(reg, obj);
+}
+
+
+void FlowGraphCompiler::EmitEqualityRegRegCompare(Register left,
+                                                  Register right,
+                                                  bool needs_number_check) {
+  if (needs_number_check) {
+    __ pushq(left);
+    __ pushq(right);
+    __ call(&StubCode::IdenticalWithNumberCheckLabel());
+    // Stub returns result in flags (result of a cmpl, we need ZF computed).
+    __ popq(right);
+    __ popq(left);
   } else {
-    __ CompareObject(reg, obj);
+    __ cmpl(left, right);
   }
 }
 
 
 // Implement equality spec: if any of the arguments is null do identity check.
 // Fallthrough calls super equality.
 void FlowGraphCompiler::EmitSuperEqualityCallPrologue(Register result,
                                                       Label* skip_call) {
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
@@ skipping 235 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64