An unnecessary check for the range of a smi was being performed in

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index ee6eb97714217aab7672e66f02d05d65caa022af..140a2abc1ac1542f1cbcd945bcb3271b89e214da 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -4689,12 +4689,7 @@ static void GenerateRecordCallTarget(MacroAssembler* masm) {
   // Special handling of the Array() function, which caches not only the
   // monomorphic Array function but the initial ElementsKind with special
   // sentinels
-  Handle<Object> terminal_kind_sentinel =
-      TypeFeedbackCells::MonomorphicArraySentinel(masm->isolate(),
-                                                  LAST_FAST_ELEMENTS_KIND);
   __ JumpIfNotSmi(r3, &miss);
-  __ cmp(r3, Operand(terminal_kind_sentinel));

[danno, 2013/06/13 15:19:44]

How about you turn this into:

  if (FLAG_debug_code) {
    __ cmp(r3, Operand(terminal_kind_sentinel));
    Check(le, "Array function sentinel is not an Elementskind");
  }

on this and other platforms?

-  __ b(gt, &miss);
   // Make sure the function is the Array() function
   __ LoadArrayFunction(r3);
   __ cmp(r1, r3);