Active smi-only optimizations for large array literals.

src/x64/full-codegen-x64.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 1449 matching lines @@
     int offset = FixedArray::kHeaderSize + (i * kPointerSize);
     __ movq(FieldOperand(rbx, offset), result_register());
 
     Label no_map_change;
     __ JumpIfSmi(result_register(), &no_map_change);
     // Update the write barrier for the array store.
     __ RecordWriteField(rbx, offset, result_register(), rcx,
                         kDontSaveFPRegs,
                         EMIT_REMEMBERED_SET,
                         OMIT_SMI_CHECK);
-    if (FLAG_smi_only_arrays) {
-      __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
-      __ CheckFastSmiOnlyElements(rdi, &no_map_change, Label::kNear);
-      __ push(r8);
-      __ CallRuntime(Runtime::kNonSmiElementStored, 1);
-    }
+    __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
+    __ CheckFastSmiOnlyElements(rdi, &no_map_change, Label::kNear);
+    __ push(r8);
+    __ CallRuntime(Runtime::kNonSmiElementStored, 1);
     __ bind(&no_map_change);
 
     PrepareForBailoutForId(expr->GetIdForElement(i), NO_REGISTERS);
   }
 
   if (result_saved) {
     context()->PlugTOS();
   } else {
     context()->Plug(rax);
   }
@@ skipping 2710 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64