isolate()->factory()->NewFixedArray(values->length(), TENURED);
Handle<FixedDoubleArray> double_literals;
ElementsKind elements_kind = FAST_SMI_ONLY_ELEMENTS;
+ bool has_only_undefined_values = true;
// Fill in the literals.
bool is_simple = true;
// FAST_DOUBLE_ELEMENTS and FAST_ELEMENTS as necessary. Always remember
// the tagged value, no matter what the ElementsKind is in case we
// ultimately end up in FAST_ELEMENTS.
+ has_only_undefined_values = false;
object_literals->set(i, *boilerplate_value);
if (elements_kind == FAST_SMI_ONLY_ELEMENTS) {
// Smi only elements. Notice if a transition to FAST_DOUBLE_ELEMENTS or
}
}
+ // Very small array literals that don't have a concrete hint about their type
+ // from a constant value should default to the slow case to avoid lots of
+ // elements transitions on really small objects.
+ if (has_only_undefined_values && values->length() <= 2) {
+ elements_kind = FAST_ELEMENTS;
+ }
+
// Simple and shallow arrays can be lazily copied, we transform the
// elements array to a copy-on-write array.
if (is_simple && depth == 1 && values->length() > 0 &&