On Thu, 3 Jun 2021 00:29:00 GMT, Sandhya Viswanathan <sviswanat...@openjdk.org>
wrote:
> The Vector API toShuffle method can be optimized using existing vector
> conversion intrinsic.
>
> The following changes are made:
> 1) vector.toShuffle java implementation is changed to call
> VectorSupport.convert.
> 2) The conversion intrinsic (inline_vector_convert()) in vectorIntrinsics.cpp
> is changed to allow shuffle as a destination type.
> 3) The shuffle.toVector intrinsic (inline_vector_shuffle_to_vector()) in
> vectorIntrinsics.cpp now explicitly generates conversion node instead of
> performing conversion during unbox. This is to remove unnecessary boxing
> during back to back vector.toShuffle and shuffle.toVector calls.
>
> Best Regards,
> Sandhya
src/hotspot/share/opto/vectornode.cpp line 1246:
> 1244: return new VectorLoadMaskNode(value, out_vt);
> 1245: } else if (is_vector_shuffle) {
> 1246: if (!is_shuffle_to_vector()) {
Hi @sviswa7 , thanks for this change! I'm just curious whether
`is_shuffle_to_vector()` is still needed for `VectorUnboxNode` with this
change? It seems this flag can be removed, doesn't it?
-------------
PR: https://git.openjdk.java.net/jdk/pull/4326
