does doing an unchecked cast of the return value of the aget on the byte
array change things?
(defn test-fn
[]
(let [obj-ary (object-array 10)
byte-data (byte-array (range 10))]
(doseq [idx (range 10)]
(let [idx (int idx)]
(aget obj-ary idx
(bit-and 0xFF (unchecked-long (aget byte-data
idx))))))))
This disassembled clearer and I think dropped the long cast.
On Wed, Jan 30, 2019 at 3:03 PM Brian Craft <[email protected]> wrote:
> Profiling is showing a lot of time spent in RT.longCast, in places like
> this:
>
> (aget flat-dict (bit-and 0xff (aget arr j)))
>
> arr is hinted as ^bytes, and flat-dict as ^objects.
>
> which compiles to this:
>
> Object code2 = RT.aget((Object[])flat_dict, RT.intCast(0xFFL &
> RT.longCast((Object)RT.aget((byte[])arr2, RT.intCast(k)))))
>
> Is there any way to avoid that RT.longCast? There is an aget method in
> RT.java that returns a byte, and a longCast for byte, but I suspect the
> cast to Object is causing it to hit the longCast for Object, which does a
> bunch of reflection.
>
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