Active smi-only optimizations for large array literals.

src/arm/stub-cache-arm.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1600 matching lines @@
       const int kEndElementsOffset =
           FixedArray::kHeaderSize - kHeapObjectTag - argc * kPointerSize;
       __ str(r4, MemOperand(end_elements, kEndElementsOffset, PreIndex));
 
       // Check for a smi.
       __ Drop(argc + 1);
       __ Ret();
 
       __ bind(&with_write_barrier);
 
-      if (FLAG_smi_only_arrays) {
-        __ ldr(r6, FieldMemOperand(receiver, HeapObject::kMapOffset));
-        __ CheckFastSmiOnlyElements(r6, r6, &call_builtin);
-      }
+      __ ldr(r6, FieldMemOperand(receiver, HeapObject::kMapOffset));
+      __ CheckFastSmiOnlyElements(r6, r6, &call_builtin);
 
       // Save new length.
       __ str(r0, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
       // Push the element.
       // We may need a register containing the address end_elements below,
       // so write back the value in end_elements.
       __ add(end_elements, elements,
              Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
       __ str(r4, MemOperand(end_elements, kEndElementsOffset, PreIndex));
@@ skipping 10 matching lines @@
 
       __ bind(&attempt_to_grow_elements);
       // r0: array's length + 1.
       // r4: elements' length.
 
       if (!FLAG_inline_new) {
         __ b(&call_builtin);
       }
 
       __ ldr(r2, MemOperand(sp, (argc - 1) * kPointerSize));
-      if (FLAG_smi_only_arrays) {
-        // Growing elements that are SMI-only requires special handling in case
-        // the new element is non-Smi. For now, delegate to the builtin.
-        Label no_fast_elements_check;
-        __ JumpIfSmi(r2, &no_fast_elements_check);
-        __ ldr(r7, FieldMemOperand(receiver, HeapObject::kMapOffset));
-        __ CheckFastObjectElements(r7, r7, &call_builtin);
-        __ bind(&no_fast_elements_check);
-      }
+      // Growing elements that are SMI-only requires special handling in case
+      // the new element is non-Smi. For now, delegate to the builtin.
+      Label no_fast_elements_check;
+      __ JumpIfSmi(r2, &no_fast_elements_check);
+      __ ldr(r7, FieldMemOperand(receiver, HeapObject::kMapOffset));
+      __ CheckFastObjectElements(r7, r7, &call_builtin);
+      __ bind(&no_fast_elements_check);
 
       Isolate* isolate = masm()->isolate();
       ExternalReference new_space_allocation_top =
           ExternalReference::new_space_allocation_top_address(isolate);
       ExternalReference new_space_allocation_limit =
           ExternalReference::new_space_allocation_limit_address(isolate);
 
       const int kAllocationDelta = 4;
       // Load top and check if it is the end of elements.
       __ add(end_elements, elements,
@@ skipping 2773 matching lines @@
       masm->isolate()->builtins()->KeyedStoreIC_MissForceGeneric();
   __ Jump(ic, RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM