msokolov commented on PR #12311:
URL: https://github.com/apache/lucene/pull/12311#issuecomment-1557119416
When I had tried this before I did something like:
```
+ ShortVector acc = ShortVector.zero(SHORT_SPECIES);
+ int l = 0;
+ for (; l < BYTE_SPECIES.loopBound(len); l += BYTE_SPECIES.length()) {
+ ByteVector va = ByteVector.fromArray(BYTE_SPECIES, a.bytes, aOffset +
l);
+ ByteVector vb = ByteVector.fromArray(BYTE_SPECIES, b.bytes, bOffset +
l);
+
+ Vector<Short> vas = va.castShape(SHORT_SPECIES, 0);
+ Vector<Short> vbs = vb.castShape(SHORT_SPECIES, 0);
+ acc = acc.add(vas.mul(vbs));
+
+ vas = va.castShape(SHORT_SPECIES, 1);
+ vbs = vb.castShape(SHORT_SPECIES, 1);
+ acc = acc.add(vas.mul(vbs));
+ }
+ long total = acc.reduceLanesToLong(VectorOperators.ADD);
```
I don't have perf numbers any more - no idea whether this is better than
what you have already - probably not, but it might be worth trying castShape?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org
For additional commands, e-mail: issues-h...@lucene.apache.org
