Various little cleanups to avoid excessive allocation of handles.

runtime/vm/intermediate_language_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/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 435 matching lines @@
     __ LoadClassId(temp, left);
     __ Bind(&done);
   } else {
     __ j(ZERO, deopt);  // Smi deopts.
     __ LoadClassId(temp, left);
   }
   // 'temp' contains class-id of the left argument.
   ObjectStore* object_store = Isolate::Current()->object_store();
   Condition cond = TokenKindToSmiCondition(kind);
   Label done;
-  for (intptr_t i = 0; i < ic_data.NumberOfChecks(); i++) {
+  const intptr_t len = ic_data.NumberOfChecks();
+  for (intptr_t i = 0; i < len; i++) {
     // Assert that the Smi is at position 0, if at all.
     ASSERT((ic_data.GetReceiverClassIdAt(i) != kSmiCid) || (i == 0));
     Label next_test;
     __ cmpq(temp, Immediate(ic_data.GetReceiverClassIdAt(i)));
     __ j(NOT_EQUAL, &next_test);
     const Function& target = Function::ZoneHandle(ic_data.GetTargetAt(i));
     if (target.Owner() == object_store->object_class()) {
       // Object.== is same as ===.
       __ Drop(2);
       __ cmpq(left, right);
@@ skipping 63 matching lines @@
   // 'left' is not Smi.
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   Label identity_compare;
   __ cmpq(right, raw_null);
   __ j(EQUAL, &identity_compare);
   __ cmpq(left, raw_null);
   __ j(EQUAL, &identity_compare);
 
   __ LoadClassId(temp, left);
-  for (intptr_t i = 0; i < ic_data.NumberOfChecks(); i++) {
+  const intptr_t len = ic_data.NumberOfChecks();
+  for (intptr_t i = 0; i < len; i++) {
     __ cmpq(temp, Immediate(ic_data.GetReceiverClassIdAt(i)));
-    if (i == (ic_data.NumberOfChecks() - 1)) {
+    if (i == (len - 1)) {
       __ j(NOT_EQUAL, deopt);
     } else {
       __ j(EQUAL, &identity_compare);
     }
   }
   __ Bind(&identity_compare);
   __ cmpq(left, right);
   if (branch == NULL) {
     Label done, is_equal;
     Register result = locs.out().reg();
@@ skipping 1808 matching lines @@
 
 void ShiftMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64