Active smi-only optimizations for large array literals.

src/ia32/ic-ia32.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 815 matching lines @@
   __ j(not_equal, &fast_double_with_map_check);
   __ bind(&fast_object_without_map_check);
   // Smi stores don't require further checks.
   Label non_smi_value;
   __ JumpIfNotSmi(eax, &non_smi_value);
   // It's irrelevant whether array is smi-only or not when writing a smi.
   __ mov(CodeGenerator::FixedArrayElementOperand(ebx, ecx), eax);
   __ ret(0);
 
   __ bind(&non_smi_value);
-  if (FLAG_smi_only_arrays) {
-    // Escape to slow case when writing non-smi into smi-only array.
-    __ mov(edi, FieldOperand(edx, HeapObject::kMapOffset));
-    __ CheckFastObjectElements(edi, &slow, Label::kNear);
-  }
+  // Escape to slow case when writing non-smi into smi-only array.
+  __ mov(edi, FieldOperand(edx, HeapObject::kMapOffset));
+  __ CheckFastObjectElements(edi, &slow, Label::kNear);
 
   // Fast elements array, store the value to the elements backing store.
   __ mov(CodeGenerator::FixedArrayElementOperand(ebx, ecx), eax);
   // Update write barrier for the elements array address.
   __ mov(edx, eax);  // Preserve the value which is returned.
   __ RecordWriteArray(
       ebx, edx, ecx, kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   __ ret(0);
 
   __ bind(&fast_double_with_map_check);
@@ skipping 827 matching lines @@
   Condition cc = *jmp_address == Assembler::kJncShortOpcode
       ? not_zero
       : zero;
   *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32