Convert UnaryOpStub to a HydrogenCodeStub

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 296458f3ef2d56d23a7edf452d9be6da40677881..644f13c28cc03b1bd42c3ee0ee0213f5f99403fc 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1864,12 +1864,12 @@ int LCodeGen::GetNextEmittedBlock() const {
 
 template<class InstrType>
 void LCodeGen::EmitBranch(InstrType instr, Condition cc) {
-  int right_block = instr->FalseDestination(chunk_);
   int left_block = instr->TrueDestination(chunk_);
+  int right_block = instr->FalseDestination(chunk_);
 
   int next_block = GetNextEmittedBlock();
 
-  if (right_block == left_block) {
+  if (right_block == left_block || cc == no_condition) {
     EmitGoto(left_block);
   } else if (left_block == next_block) {
     __ j(NegateCondition(cc), chunk_->GetAssemblyLabel(right_block));
@@ -1889,6 +1889,25 @@ void LCodeGen::DoDebugBreak(LDebugBreak* instr) {
 }
 
 
+void LCodeGen::DoIsNumberAndBranch(LIsNumberAndBranch* instr) {
+  Representation r = instr->hydrogen()->value()->representation();
+  if (r.IsSmiOrInteger32() || r.IsDouble()) {
+    EmitBranch(instr, no_condition);
+  } else {
+    ASSERT(r.IsTagged());
+    Register reg = ToRegister(instr->value());
+    HType type = instr->hydrogen()->value()->type();
+    if (type.IsTaggedNumber()) {
+      EmitBranch(instr, no_condition);
+    }
+    __ JumpIfSmi(reg, instr->TrueLabel(chunk_));
+    __ CompareRoot(FieldOperand(reg, HeapObject::kMapOffset),
+                   Heap::kHeapNumberMapRootIndex);
+    EmitBranch(instr, equal);
+  }
+}
+
+
 void LCodeGen::DoBranch(LBranch* instr) {
   Representation r = instr->hydrogen()->value()->representation();
   if (r.IsInteger32()) {