ChrisHegarty commented on PR #12311:
URL: https://github.com/apache/lucene/pull/12311#issuecomment-1560683064
Trivially, the JDK Vector source (at least in the comments) seems to
describe what we expect, but this is not the behaviour that we observe.
VectorShape.java
```
static int getMaxVectorBitSize(Class<?> etype) {
// VectorSupport.getMaxLaneCount may return -1 if C2 is not enabled,
// or a value smaller than the S_64_BIT.vectorBitSize /
elementSizeInBits if MaxVectorSize < 16
// If so default to S_64_BIT
int maxLaneCount = VectorSupport.getMaxLaneCount(etype);
int elementSizeInBits = LaneType.of(etype).elementSize;
return Math.max(maxLaneCount * elementSizeInBits,
S_64_BIT.vectorBitSize);
}
```
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