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Optimize array slice for fast-array cases (#3213)

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Performance results:
Intel: 0m27s -> 0m7s
ARM: 5m42s -> 1m26s

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu
This commit is contained in:
Szilagyi Adam 2019-10-30 16:43:17 +01:00 committed by Dániel Bátyai
parent 1edfa81c76
commit d801fc70bb
1 changed files with 24 additions and 0 deletions
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24
jerry-core/ecma/builtin-objects/ecma-builtin-array-prototype.c
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@ -802,6 +802,30 @@ ecma_builtin_array_prototype_object_slice (ecma_value_t arg1, /**< start */
/* 9. */
uint32_t n = 0;
if (ecma_op_object_is_fast_array (obj_p))
{
ecma_extended_object_t *ext_from_obj_p = (ecma_extended_object_t *) obj_p;
if (ext_from_obj_p->u.array.u.hole_count < ECMA_FAST_ARRAY_HOLE_ONE
&& len != 0
&& start < end)
{
uint32_t length = end - start;
ecma_extended_object_t *ext_to_obj_p = (ecma_extended_object_t *) new_array_p;
ecma_value_t *to_buffer_p = ecma_fast_array_extend (new_array_p, length);
ecma_value_t *from_buffer_p = ECMA_GET_NON_NULL_POINTER (ecma_value_t, obj_p->u1.property_list_cp);
for (uint32_t k = start; k < end; k++, n++)
{
to_buffer_p[n] = ecma_copy_value_if_not_object (from_buffer_p[k]);
}
ext_to_obj_p->u.array.u.hole_count -= length * ECMA_FAST_ARRAY_HOLE_ONE;
return new_array;
}
}
/* 10. */
for (uint32_t k = start; k < end; k++, n++)
{