Hydrogen code stubs for vector-based ICs.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 91df47a91e9987b0aac3b16c7c6a832bee5458ca..c05a1a81a806bf1678af131f13504a2c6e8baab1 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -652,9 +652,20 @@ void MathPowStub::Generate(MacroAssembler* masm) {
 void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver = LoadDescriptor::ReceiverRegister();
+  if (FLAG_vector_ics) {
+    // With careful management, we won't have to save slot and vector on
+    // the stack. Simply handle the possibly missing case first.
+    // TODO(mvstanton): this code can be more efficient.
+    __ cmp(FieldOperand(receiver, JSFunction::kPrototypeOrInitialMapOffset),
+           Immediate(isolate()->factory()->the_hole_value()));
+    __ j(equal, &miss);
+    __ TryGetFunctionPrototype(receiver, eax, ebx, &miss);
+    __ ret(0);
+  } else {
+    NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, eax,
+                                                            ebx, &miss);
+  }
 
-  NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, eax,
-                                                          ebx, &miss);
   __ bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));