Convert ToBooleanStub to a HydrogenStub. Currently just using HBranch, which is still fully impleme…

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index afd066d6f19ce566ad18dd99bd4f6655770a8d62..20288af53fe545e992ec495ebeed8b303e43faaa 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -676,4 +676,25 @@ Handle<Code> CompareNilICStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
+
+template <>
+HValue* CodeStubGraphBuilder<ToBooleanStub>::BuildCodeInitializedStub() {
+  ToBooleanStub* stub = casted_stub();
+
+  IfBuilder if_true(this);
+  if_true.If<HBranch>(GetParameter(0), stub->GetTypes());
+  if_true.Then();
+    if_true.Return(graph()->GetConstant1());
+  if_true.Else();
+    if_true.Return(graph()->GetConstant0());
+  if_true.End();
+  return graph()->GetConstantUndefined();

[Toon Verwaest, 2013/05/28 09:33:32]

This is a bit weird. What about just having the Then branch in the if_true; and
returning graph()->GetConstant0() rather than GetConstantUndefined() after the
iftrue?

+}
+
+
+Handle<Code> ToBooleanStub::GenerateCode() {
+  return DoGenerateCode(this);
+}
+
+
 } }  // namespace v8::internal