ChrisHegarty commented on PR #12632:
URL: https://github.com/apache/lucene/pull/12632#issuecomment-1752024575
```
// sum into accumulators
Vector<Short> prod16 = prod16_1.add(prod16_2);
acc = acc.add(prod16.convert(VectorOperators.S2I, 0));
acc = acc.add(prod16.convert(VectorOperators.S2I, 1));
```
What is the maximum value that we can see in the input bytes? Can they every
hold `-128`? Do we need to handle "overflow" in the short accumulation and
subsequent conversion to `int`? If so then we can use
`VectorOperators.ZERO_EXTEND_S2I` (rather than `S2I`). ( this is just a
question, rather than a suggestion, since I only thought of this after leaving
my keyboard)
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