MIPS: Convert UnaryOpStub to a HydrogenCodeStub.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index a2f94fa5d4bd94006d44705849b41228b7ee73da..ade50ac6e098765ab65353aa0eee655cfbe78ced 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1971,11 +1971,11 @@ int LCodeGen::GetNextEmittedBlock() const {
 template<class InstrType>
 void LCodeGen::EmitBranch(InstrType instr,
                           Condition cc, Register src1, const Operand& src2) {
-  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 == al) {
     EmitGoto(left_block);
   } else if (left_block == next_block) {
     __ Branch(chunk_->GetAssemblyLabel(right_block),
@@ -2015,6 +2015,25 @@ void LCodeGen::DoDebugBreak(LDebugBreak* instr) {
 }
 
 
+void LCodeGen::DoIsNumberAndBranch(LIsNumberAndBranch* instr) {
+  Representation r = instr->hydrogen()->value()->representation();
+  if (r.IsSmiOrInteger32() || r.IsDouble()) {
+    EmitBranch(instr, al, zero_reg, Operand(zero_reg));
+  } else {
+    ASSERT(r.IsTagged());
+    Register reg = ToRegister(instr->value());
+    HType type = instr->hydrogen()->value()->type();
+    if (type.IsTaggedNumber()) {
+      EmitBranch(instr, al, zero_reg, Operand(zero_reg));
+    }
+    __ JumpIfSmi(reg, instr->TrueLabel(chunk_));
+    __ lw(scratch0(), FieldMemOperand(reg, HeapObject::kMapOffset));
+    __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+    EmitBranch(instr, eq, scratch0(), Operand(at));
+  }
+}
+
+
 void LCodeGen::DoBranch(LBranch* instr) {
   Representation r = instr->hydrogen()->value()->representation();
   if (r.IsInteger32() || r.IsSmi()) {