Simplified the full codegens by removing the Expression::kTestValue...

src/x64/full-codegen-x64.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 235 matching lines @@
           break;
         case kStack:
           __ push(reg);
           break;
       }
       break;
 
     case Expression::kTest:
       // For simplicity we always test the accumulator register.
       if (!reg.is(result_register())) __ movq(result_register(), reg);
-      DoTest(context);
-      break;
-
-    case Expression::kValueTest:
-    case Expression::kTestValue:
-      if (!reg.is(result_register())) __ movq(result_register(), reg);
-      switch (location_) {
-        case kAccumulator:
-          break;
-        case kStack:
-          __ push(result_register());
-          break;
-      }
-      DoTest(context);
+      DoTest(true_label_, false_label_, NULL);
       break;
   }
 }
 
 
 void FullCodeGenerator::Apply(Expression::Context context, Slot* slot) {
   switch (context) {
     case Expression::kUninitialized:
       UNREACHABLE();
     case Expression::kEffect:
       // Nothing to do.
       break;
     case Expression::kValue: {
       MemOperand slot_operand = EmitSlotSearch(slot, result_register());
       switch (location_) {
         case kAccumulator:
           __ movq(result_register(), slot_operand);
           break;
         case kStack:
           // Memory operands can be pushed directly.
           __ push(slot_operand);
           break;
       }
       break;
     }
 
     case Expression::kTest:
       Move(result_register(), slot);
-      DoTest(context);
-      break;
-
-    case Expression::kValueTest:
-    case Expression::kTestValue:
-      Move(result_register(), slot);
-      switch (location_) {
-        case kAccumulator:
-          break;
-        case kStack:
-          __ push(result_register());
-          break;
-      }
-      DoTest(context);
+      DoTest(true_label_, false_label_, NULL);
       break;
   }
 }
 
 
 void FullCodeGenerator::Apply(Expression::Context context, Literal* lit) {
   switch (context) {
     case Expression::kUninitialized:
       UNREACHABLE();
     case Expression::kEffect:
       // Nothing to do.
       break;
     case Expression::kValue:
       switch (location_) {
         case kAccumulator:
           __ Move(result_register(), lit->handle());
           break;
         case kStack:
           __ Push(lit->handle());
           break;
       }
       break;
 
     case Expression::kTest:
       __ Move(result_register(), lit->handle());
-      DoTest(context);
-      break;
-
-    case Expression::kValueTest:
-    case Expression::kTestValue:
-      __ Move(result_register(), lit->handle());
-      switch (location_) {
-        case kAccumulator:
-          break;
-        case kStack:
-          __ push(result_register());
-          break;
-      }
-      DoTest(context);
+      DoTest(true_label_, false_label_, NULL);
       break;
   }
 }
 
 
 void FullCodeGenerator::ApplyTOS(Expression::Context context) {
   switch (context) {
     case Expression::kUninitialized:
       UNREACHABLE();
 
     case Expression::kEffect:
       __ Drop(1);
       break;
 
     case Expression::kValue:
       switch (location_) {
         case kAccumulator:
           __ pop(result_register());
           break;
         case kStack:
           break;
       }
       break;
 
     case Expression::kTest:
       __ pop(result_register());
-      DoTest(context);
-      break;
-
-    case Expression::kValueTest:
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          __ pop(result_register());
-          break;
-        case kStack:
-          __ movq(result_register(), Operand(rsp, 0));
-          break;
-      }
-      DoTest(context);
+      DoTest(true_label_, false_label_, NULL);
       break;
   }
 }
 
 
 void FullCodeGenerator::DropAndApply(int count,
                                      Expression::Context context,
                                      Register reg) {
   ASSERT(count > 0);
   ASSERT(!reg.is(rsp));
@@ skipping 14 matching lines @@
         case kStack:
           if (count > 1) __ Drop(count - 1);
           __ movq(Operand(rsp, 0), reg);
           break;
       }
       break;
 
     case Expression::kTest:
       __ Drop(count);
       if (!reg.is(result_register())) __ movq(result_register(), reg);
-      DoTest(context);
-      break;
-
-    case Expression::kValueTest:
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          __ Drop(count);
-          if (!reg.is(result_register())) __ movq(result_register(), reg);
-          break;
-        case kStack:
-          if (count > 1) __ Drop(count - 1);
-          __ movq(result_register(), reg);
-          __ movq(Operand(rsp, 0), result_register());
-          break;
-      }
-      DoTest(context);
+      DoTest(true_label_, false_label_, NULL);
       break;
   }
 }
 
 
 void FullCodeGenerator::PrepareTest(Label* materialize_true,
                                     Label* materialize_false,
                                     Label** if_true,
                                     Label** if_false) {
   switch (context_) {
     case Expression::kUninitialized:
       UNREACHABLE();
       break;
     case Expression::kEffect:
       // In an effect context, the true and the false case branch to the
       // same label.
       *if_true = *if_false = materialize_true;
       break;
     case Expression::kValue:
       *if_true = materialize_true;
       *if_false = materialize_false;
       break;
     case Expression::kTest:
       *if_true = true_label_;
       *if_false = false_label_;
       break;
-    case Expression::kValueTest:
-      *if_true = materialize_true;
-      *if_false = false_label_;
-      break;
-    case Expression::kTestValue:
-      *if_true = true_label_;
-      *if_false = materialize_false;
-      break;
   }
 }
 
 
 void FullCodeGenerator::Apply(Expression::Context context,
                               Label* materialize_true,
                               Label* materialize_false) {
   switch (context) {
     case Expression::kUninitialized:
 
@@ skipping 19 matching lines @@
           __ bind(materialize_false);
           __ Push(Factory::false_value());
           break;
       }
       __ bind(&done);
       break;
     }
 
     case Expression::kTest:
       break;
-
-    case Expression::kValueTest:
-      __ bind(materialize_true);
-      switch (location_) {
-        case kAccumulator:
-          __ Move(result_register(), Factory::true_value());
-          break;
-        case kStack:
-          __ Push(Factory::true_value());
-          break;
-      }
-      __ jmp(true_label_);
-      break;
-
-    case Expression::kTestValue:
-      __ bind(materialize_false);
-      switch (location_) {
-        case kAccumulator:
-          __ Move(result_register(), Factory::false_value());
-          break;
-        case kStack:
-          __ Push(Factory::false_value());
-          break;
-      }
-      __ jmp(false_label_);
-      break;
   }
 }
 
 
 // Convert constant control flow (true or false) to the result expected for
 // a given expression context.
 void FullCodeGenerator::Apply(Expression::Context context, bool flag) {
   switch (context) {
     case Expression::kUninitialized:
       UNREACHABLE();
       break;
     case Expression::kEffect:
       break;
     case Expression::kValue: {
       Heap::RootListIndex value_root_index =
           flag ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex;
       switch (location_) {
         case kAccumulator:
           __ LoadRoot(result_register(), value_root_index);
           break;
         case kStack:
           __ PushRoot(value_root_index);
           break;
       }
       break;
     }
     case Expression::kTest:
       __ jmp(flag ? true_label_ : false_label_);
       break;
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          // If value is false it's needed.
-          if (!flag) __ LoadRoot(result_register(), Heap::kFalseValueRootIndex);
-          break;
-        case kStack:
-          // If value is false it's needed.
-          if (!flag) __ PushRoot(Heap::kFalseValueRootIndex);
-          break;
-      }
-      __ jmp(flag ? true_label_ : false_label_);
-      break;
-    case Expression::kValueTest:
-      switch (location_) {
-        case kAccumulator:
-          // If value is true it's needed.
-          if (flag) __ LoadRoot(result_register(), Heap::kTrueValueRootIndex);
-          break;
-        case kStack:
-          // If value is true it's needed.
-          if (flag) __ PushRoot(Heap::kTrueValueRootIndex);
-          break;
-      }
-      __ jmp(flag ? true_label_ : false_label_);
-      break;
   }
 }
 
 
-void FullCodeGenerator::DoTest(Expression::Context context) {
-  // The value to test is in the accumulator.  If the value might be needed
-  // on the stack (value/test and test/value contexts with a stack location
-  // desired), then the value is already duplicated on the stack.
-  ASSERT_NE(NULL, true_label_);
-  ASSERT_NE(NULL, false_label_);
-
-  // In value/test and test/value expression contexts with stack as the
-  // desired location, there is already an extra value on the stack.  Use a
-  // label to discard it if unneeded.
-  Label discard;
-  Label* if_true = true_label_;
-  Label* if_false = false_label_;
-  switch (context) {
-    case Expression::kUninitialized:
-    case Expression::kEffect:
-    case Expression::kValue:
-      UNREACHABLE();
-    case Expression::kTest:
-      break;
-    case Expression::kValueTest:
-      switch (location_) {
-        case kAccumulator:
-          break;
-        case kStack:
-          if_false = &discard;
-          break;
-      }
-      break;
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          break;
-        case kStack:
-          if_true = &discard;
-          break;
-      }
-      break;
-  }
-
+void FullCodeGenerator::DoTest(Label* if_true,
+                               Label* if_false,
+                               Label* fall_through) {
   // Emit the inlined tests assumed by the stub.
   __ CompareRoot(result_register(), Heap::kUndefinedValueRootIndex);
   __ j(equal, if_false);
   __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
   __ j(equal, if_true);
   __ CompareRoot(result_register(), Heap::kFalseValueRootIndex);
   __ j(equal, if_false);
   ASSERT_EQ(0, kSmiTag);
   __ SmiCompare(result_register(), Smi::FromInt(0));
   __ j(equal, if_false);
   Condition is_smi = masm_->CheckSmi(result_register());
   __ j(is_smi, if_true);
 
-  // Save a copy of the value if it may be needed and isn't already saved.
-  switch (context) {
-    case Expression::kUninitialized:
-    case Expression::kEffect:
-    case Expression::kValue:
-      UNREACHABLE();
-    case Expression::kTest:
-      break;
-    case Expression::kValueTest:
-      switch (location_) {
-        case kAccumulator:
-          __ push(result_register());
-          break;
-        case kStack:
-          break;
-      }
-      break;
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          __ push(result_register());
-          break;
-        case kStack:
-          break;
-      }
-      break;
-  }
-
   // Call the ToBoolean stub for all other cases.
   ToBooleanStub stub;
   __ push(result_register());
   __ CallStub(&stub);
   __ testq(rax, rax);
 
-  // The stub returns nonzero for true.  Complete based on the context.
-  switch (context) {
-    case Expression::kUninitialized:
-    case Expression::kEffect:
-    case Expression::kValue:
-      UNREACHABLE();
+  // The stub returns nonzero for true.
+  Split(not_zero, if_true, if_false, fall_through);
+}
 
-    case Expression::kTest:
-      __ j(not_zero, true_label_);
-      __ jmp(false_label_);
-      break;
 
-    case Expression::kValueTest:
-      switch (location_) {
-        case kAccumulator:
-          __ j(zero, &discard);
-          __ pop(result_register());
-          __ jmp(true_label_);
-          break;
-        case kStack:
-          __ j(not_zero, true_label_);
-          break;
-      }
-      __ bind(&discard);
-      __ Drop(1);
-      __ jmp(false_label_);
-      break;
-
-    case Expression::kTestValue:
-      switch (location_) {
-        case kAccumulator:
-          __ j(not_zero, &discard);
-          __ pop(result_register());
-          __ jmp(false_label_);
-          break;
-        case kStack:
-          __ j(zero, false_label_);
-          break;
-      }
-      __ bind(&discard);
-      __ Drop(1);
-      __ jmp(true_label_);
-      break;
+void FullCodeGenerator::Split(Condition cc,
+                              Label* if_true,
+                              Label* if_false,
+                              Label* fall_through) {
+  if (if_false == fall_through) {
+    __ j(cc, if_true);
+  } else if (if_true == fall_through) {
+    __ j(NegateCondition(cc), if_false);
+  } else {
+    __ j(cc, if_true);
+    __ jmp(if_false);
   }
 }
 
 
 MemOperand FullCodeGenerator::EmitSlotSearch(Slot* slot, Register scratch) {
   switch (slot->type()) {
     case Slot::PARAMETER:
     case Slot::LOCAL:
       return Operand(rbp, SlotOffset(slot));
     case Slot::CONTEXT: {
@@ skipping 459 matching lines @@
   Comment cmnt(masm_, "[ RegExpLiteral");
   Label materialized;
   // Registers will be used as follows:
   // rdi = JS function.
   // rcx = literals array.
   // rbx = regexp literal.
   // rax = regexp literal clone.
   __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ movq(rcx, FieldOperand(rdi, JSFunction::kLiteralsOffset));
   int literal_offset =
-    FixedArray::kHeaderSize + expr->literal_index() * kPointerSize;
+      FixedArray::kHeaderSize + expr->literal_index() * kPointerSize;
   __ movq(rbx, FieldOperand(rcx, literal_offset));
   __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
   __ j(not_equal, &materialized);
 
   // Create regexp literal using runtime function
   // Result will be in rax.
   __ push(rcx);
   __ Push(Smi::FromInt(expr->literal_index()));
   __ Push(expr->pattern());
   __ Push(expr->flags());
@@ skipping 760 matching lines @@
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   Condition positive_smi = __ CheckPositiveSmi(rax);
-  __ j(positive_smi, if_true);
-  __ jmp(if_false);
+  Split(positive_smi, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsObject(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ CompareRoot(rax, Heap::kNullValueRootIndex);
   __ j(equal, if_true);
   __ movq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
   // Undetectable objects behave like undefined when tested with typeof.
   __ testb(FieldOperand(rbx, Map::kBitFieldOffset),
            Immediate(1 << Map::kIsUndetectable));
   __ j(not_zero, if_false);
   __ movzxbq(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
   __ cmpq(rbx, Immediate(FIRST_JS_OBJECT_TYPE));
   __ j(below, if_false);
   __ cmpq(rbx, Immediate(LAST_JS_OBJECT_TYPE));
-  __ j(below_equal, if_true);
-  __ jmp(if_false);
+  Split(below_equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsSpecObject(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rbx);
-  __ j(above_equal, if_true);
-  __ jmp(if_false);
+  Split(above_equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsUndetectableObject(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ movq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
   __ testb(FieldOperand(rbx, Map::kBitFieldOffset),
            Immediate(1 << Map::kIsUndetectable));
-  __ j(not_zero, if_true);
-  __ jmp(if_false);
+  Split(not_zero, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
     ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
@@ skipping 16 matching lines @@
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ CmpObjectType(rax, JS_FUNCTION_TYPE, rbx);
-  __ j(equal, if_true);
-  __ jmp(if_false);
+  Split(equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsArray(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ CmpObjectType(rax, JS_ARRAY_TYPE, rbx);
-  __ j(equal, if_true);
-  __ jmp(if_false);
+  Split(equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitIsRegExp(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ JumpIfSmi(rax, if_false);
   __ CmpObjectType(rax, JS_REGEXP_TYPE, rbx);
-  __ j(equal, if_true);
-  __ jmp(if_false);
+  Split(equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 
 void FullCodeGenerator::EmitIsConstructCall(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   // Get the frame pointer for the calling frame.
   __ movq(rax, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
 
   // Skip the arguments adaptor frame if it exists.
   Label check_frame_marker;
   __ SmiCompare(Operand(rax, StandardFrameConstants::kContextOffset),
                 Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ j(not_equal, &check_frame_marker);
   __ movq(rax, Operand(rax, StandardFrameConstants::kCallerFPOffset));
 
   // Check the marker in the calling frame.
   __ bind(&check_frame_marker);
   __ SmiCompare(Operand(rax, StandardFrameConstants::kMarkerOffset),
                 Smi::FromInt(StackFrame::CONSTRUCT));
-  __ j(equal, if_true);
-  __ jmp(if_false);
+  Split(equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitObjectEquals(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 2);
 
   // Load the two objects into registers and perform the comparison.
   VisitForValue(args->at(0), kStack);
   VisitForValue(args->at(1), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   __ pop(rbx);
   __ cmpq(rax, rbx);
-  __ j(equal, if_true);
-  __ jmp(if_false);
+  Split(equal, if_true, if_false, NULL);
 
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::EmitArguments(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   // ArgumentsAccessStub expects the key in edx and the formal
   // parameter count in eax.
@@ skipping 635 matching lines @@
         case Expression::kValue:
           switch (location_) {
             case kAccumulator:
               __ LoadRoot(result_register(), Heap::kUndefinedValueRootIndex);
               break;
             case kStack:
               __ PushRoot(Heap::kUndefinedValueRootIndex);
               break;
           }
           break;
-        case Expression::kTestValue:
-          // Value is false so it's needed.
-          switch (location_) {
-            case kAccumulator:
-              __ LoadRoot(result_register(), Heap::kUndefinedValueRootIndex);
-              break;
-            case kStack:
-              __ PushRoot(Heap::kUndefinedValueRootIndex);
-              break;
-          }
-          // Fall through.
         case Expression::kTest:
-        case Expression::kValueTest:
           __ jmp(false_label_);
           break;
       }
       break;
     }
 
     case Token::NOT: {
       Comment cmnt(masm_, "[ UnaryOperation (NOT)");
       Label materialize_true, materialize_false;
       Label* if_true = NULL;
@@ skipping 160 matching lines @@
   // Save result for postfix expressions.
   if (expr->is_postfix()) {
     switch (context_) {
       case Expression::kUninitialized:
         UNREACHABLE();
       case Expression::kEffect:
         // Do not save result.
         break;
       case Expression::kValue:
       case Expression::kTest:
-      case Expression::kValueTest:
-      case Expression::kTestValue:
         // Save the result on the stack. If we have a named or keyed property
         // we store the result under the receiver that is currently on top
         // of the stack.
         switch (assign_type) {
           case VARIABLE:
             __ push(rax);
             break;
           case NAMED_PROPERTY:
             __ movq(Operand(rsp, kPointerSize), rax);
             break;
@@ skipping 83 matching lines @@
           ApplyTOS(context_);
         }
       } else {
         Apply(context_, rax);
       }
       break;
     }
   }
 }
 
-void FullCodeGenerator::VisitBinaryOperation(BinaryOperation* expr) {
-  Comment cmnt(masm_, "[ BinaryOperation");
-  switch (expr->op()) {
-    case Token::COMMA:
-      VisitForEffect(expr->left());
-      Visit(expr->right());
-      break;
-
-    case Token::OR:
-    case Token::AND:
-      EmitLogicalOperation(expr);
-      break;
-
-    case Token::ADD:
-    case Token::SUB:
-    case Token::DIV:
-    case Token::MOD:
-    case Token::MUL:
-    case Token::BIT_OR:
-    case Token::BIT_AND:
-    case Token::BIT_XOR:
-    case Token::SHL:
-    case Token::SHR:
-    case Token::SAR:
-      VisitForValue(expr->left(), kStack);
-      VisitForValue(expr->right(), kAccumulator);
-      EmitBinaryOp(expr->op(), context_);
-      break;
-
-    default:
-      UNREACHABLE();
-  }
-}
-
 
 void FullCodeGenerator::EmitNullCompare(bool strict,
                                         Register obj,
                                         Register null_const,
                                         Label* if_true,
                                         Label* if_false,
                                         Register scratch) {
   __ cmpq(obj, null_const);
   if (strict) {
-    __ j(equal, if_true);
+    Split(equal, if_true, if_false, NULL);
   } else {
     __ j(equal, if_true);
     __ CompareRoot(obj, Heap::kUndefinedValueRootIndex);
     __ j(equal, if_true);
     __ JumpIfSmi(obj, if_false);
     // It can be an undetectable object.
     __ movq(scratch, FieldOperand(obj, HeapObject::kMapOffset));
     __ testb(FieldOperand(scratch, Map::kBitFieldOffset),
              Immediate(1 << Map::kIsUndetectable));
-    __ j(not_zero, if_true);
+    Split(not_zero, if_true, if_false, NULL);
   }
-  __ jmp(if_false);
 }
 
 
 void FullCodeGenerator::VisitCompareOperation(CompareOperation* expr) {
   Comment cmnt(masm_, "[ CompareOperation");
 
   // Always perform the comparison for its control flow.  Pack the result
   // into the expression's context after the comparison is performed.
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
   VisitForValue(expr->left(), kStack);
   switch (expr->op()) {
     case Token::IN:
       VisitForValue(expr->right(), kStack);
       __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION);
       __ CompareRoot(rax, Heap::kTrueValueRootIndex);
-      __ j(equal, if_true);
-      __ jmp(if_false);
+      Split(equal, if_true, if_false, NULL);
       break;
 
     case Token::INSTANCEOF: {
       VisitForValue(expr->right(), kStack);
       InstanceofStub stub;
       __ CallStub(&stub);
       __ testq(rax, rax);
-      __ j(zero, if_true);  // The stub returns 0 for true.
-      __ jmp(if_false);
+       // The stub returns 0 for true.
+      Split(zero, if_true, if_false, NULL);
       break;
     }
 
     default: {
       VisitForValue(expr->right(), kAccumulator);
       Condition cc = no_condition;
       bool strict = false;
       switch (expr->op()) {
         case Token::EQ_STRICT:
           strict = true;
@@ skipping 47 matching lines @@
       Label slow_case;
       __ JumpIfNotBothSmi(rax, rdx, &slow_case);
       __ SmiCompare(rdx, rax);
       __ j(cc, if_true);
       __ jmp(if_false);
 
       __ bind(&slow_case);
       CompareStub stub(cc, strict);
       __ CallStub(&stub);
       __ testq(rax, rax);
-      __ j(cc, if_true);
-      __ jmp(if_false);
+      Split(cc, if_true, if_false, NULL);
     }
   }
 
   // Convert the result of the comparison into one expected for this
   // expression's context.
   Apply(context_, if_true, if_false);
 }
 
 
 void FullCodeGenerator::VisitThisFunction(ThisFunction* expr) {
@@ skipping 52 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64