WillAyd commented on PR #280:
URL: https://github.com/apache/arrow-nanoarrow/pull/280#issuecomment-1683999750
For reference here is a "shiftless" packing implementation too, though I
haven't seen as much speed up using this:
```c
static inline void _ArrowBitmapPackInt8(const int8_t* values, uint8_t* out) {
*out = (values[0]
| ((values[1] + 0x1) & 0x2)
| ((values[2] + 0x3) & 0x4)
| ((values[3] + 0x7) & 0x8)
| ((values[4] + 0xf) & 0x10)
| ((values[5] + 0x1f) & 0x20)
| ((values[6] + 0x3f) & 0x40)
| ((values[7] + 0x7f) & 0x80)
);
}
```
I am still testing these downstream so no rush to merge this - let me see if
anything becomes clearer as I work through this in pandas and will report back
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