Optimize the typeof operator.

src/mips64/lithium-codegen-mips64.cc

Index: src/mips64/lithium-codegen-mips64.cc
diff --git a/src/mips64/lithium-codegen-mips64.cc b/src/mips64/lithium-codegen-mips64.cc
index c7dd637c24a4e708b9178a5bb85f5d54a5dd032b..642939417511db21412cefb85c074a9a46aa88cf 100644
--- a/src/mips64/lithium-codegen-mips64.cc
+++ b/src/mips64/lithium-codegen-mips64.cc
@@ -5622,6 +5622,21 @@ void LCodeGen::DoTypeof(LTypeof* instr) {
 }
 
 
+void LCodeGen::DoTypeof(LTypeof* instr) {
+  DCHECK(ToRegister(instr->value()).is(a3));
+  DCHECK(ToRegister(instr->result()).is(v0));
+  Label end, do_call;
+  Register value_register = ToRegister(instr->value());
+  __ JumpIfNotSmi(value_register, &do_call);
+  __ mov(v0, Immediate(isolate()->factory()->number_string()));

[paul.l..., 2015/04/28 17:03:37]

s/b:  __ li(v0, Operand(isolate()->factory()->number_string()));

[mvstanton, 2015/04/29 06:37:24]

Done.

+  __ jmp(&end);
+  __ bind(&do_call);
+  TypeofStub stub(isolate());
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  __ bind(&end);
+}
+
+
 void LCodeGen::DoTypeofIsAndBranch(LTypeofIsAndBranch* instr) {
   Register input = ToRegister(instr->value());