On Thu, 23 Mar 2023 02:23:20 GMT, Xiaohong Gong <xg...@openjdk.org> wrote:
>> I think not emitting `VectorLoadShuffleNode` is more common so it is better
>> to emit them only when needed, as it will simplify the graph and may allow
>> better inspections of the indices in the future. Additionally, a do-nothing
>> node does not alias with its input and therefore kills the input, which
>> leads to an additional spill if they both need to live.
>
> Yeah, I agree that saving a node have some benefits like what you said. My
> concern is there are more and more methods added into `Matcher::` and each
> platform has to do the different implementation. There is not too much
> meaning for those platforms that do not implement Vector API like`
> arm/ppc/...` for me. This makes code not so easy to maintain.
I agree, I am thinking of (ab)using template to have a common query function
like this
template <VectorQuery N, class T, class... U>
T vectorQuery(U... args) {
return T();
}
then each platform can have a specialisation that looks like this:
template <>
bool vectorQuery<VectorQuery::NEEDS_LOAD_SHUFFLE>(BasicType bt, int vlen) {
}
Unimplemented platform will return `false` for this, what do you think?
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PR Review Comment: https://git.openjdk.org/jdk/pull/13093#discussion_r1153370540
