Fuse comparisons that are used by branches together.

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 41 matching lines @@
 
 // Fall through if bool_register contains null.
 void FlowGraphCompiler::GenerateBoolToJump(Register bool_register,
                                            Label* is_true,
                                            Label* is_false) {
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   Label fall_through;
   __ cmpq(bool_register, raw_null);
   __ j(EQUAL, &fall_through, Assembler::kNearJump);
-  const Bool& bool_true = Bool::ZoneHandle(Bool::True());
-  __ CompareObject(bool_register, bool_true);
+  __ CompareObject(bool_register, true_value());
   __ j(EQUAL, is_true);
   __ jmp(is_false);
   __ Bind(&fall_through);
 }
 
 
 RawSubtypeTestCache* FlowGraphCompiler::GenerateCallSubtypeTestStub(
     TypeTestStubKind test_kind,
     Register instance_reg,
     Register type_arguments_reg,
@@ skipping 485 matching lines @@
 // - RCX: instantiator or raw_null.
 // Destroys RCX and RDX.
 // Returns:
 // - true or false in RAX.
 void FlowGraphCompiler::GenerateInstanceOf(intptr_t cid,
                                            intptr_t token_index,
                                            intptr_t try_index,
                                            const AbstractType& type,
                                            bool negate_result) {
   ASSERT(type.IsFinalized() && !type.IsMalformed());
-  const Bool& bool_true = Bool::ZoneHandle(Bool::True());
-  const Bool& bool_false = Bool::ZoneHandle(Bool::False());
 
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   Label is_instance, is_not_instance;
   __ pushq(RCX);  // Store instantiator on stack.
   __ pushq(RDX);  // Store instantiator type arguments.
   // If type is instantiated and non-parameterized, we can inline code
   // checking whether the tested instance is a Smi.
   if (type.IsInstantiated()) {
     // A null object is only an instance of Object and Dynamic, which has
@@ skipping 24 matching lines @@
   __ pushq(RDX);  // Instantiator type arguments.
   __ LoadObject(RAX, test_cache);
   __ pushq(RAX);
   GenerateCallRuntime(cid, token_index, try_index, kInstanceofRuntimeEntry);
   // Pop the two parameters supplied to the runtime entry. The result of the
   // instanceof runtime call will be left as the result of the operation.
   __ Drop(7);
   Label done;
   if (negate_result) {
     __ popq(RDX);
-    __ LoadObject(RAX, bool_true);
+    __ LoadObject(RAX, true_value());
     __ cmpq(RDX, RAX);
     __ j(NOT_EQUAL, &done, Assembler::kNearJump);
-    __ LoadObject(RAX, bool_false);
+    __ LoadObject(RAX, false_value());
   } else {
     __ popq(RAX);
   }
   __ jmp(&done, Assembler::kNearJump);
 
   __ Bind(&is_not_instance);
-  __ LoadObject(RAX, negate_result ? bool_true : bool_false);
+  __ LoadObject(RAX, negate_result ? true_value() : false_value());
   __ jmp(&done, Assembler::kNearJump);
 
   __ Bind(&is_instance);
-  __ LoadObject(RAX, negate_result ? bool_false : bool_true);
+  __ LoadObject(RAX, negate_result ? false_value() : true_value());
   __ Bind(&done);
   __ popq(RDX);  // Remove pushed instantiator type arguments.
   __ popq(RCX);  // Remove pushed instantiator.
 }
 
 
 void FlowGraphCompiler::EmitInstructionPrologue(Instruction* instr) {
   LocationSummary* locs = instr->locs();
   ASSERT(locs != NULL);
 
@@ skipping 389 matching lines @@
   __ cvtsi2sd(result, temp);
   __ Bind(&done);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64