paleolimbot commented on PR #280:
URL: https://github.com/apache/arrow-nanoarrow/pull/280#issuecomment-1689124104
Yes, I'm on M1.
If I change the unpacking to a macro, I get 3x faster unpacking (and no
difference between shift/no shift):
```c
#define ARROW_BITS_UNPACK1(word, out) \
do { \
out[0] = (word >> 0) & 1; \
out[1] = (word >> 1) & 1; \
out[2] = (word >> 2) & 1; \
out[3] = (word >> 3) & 1; \
out[4] = (word >> 4) & 1; \
out[5] = (word >> 5) & 1; \
out[6] = (word >> 6) & 1; \
out[7] = (word >> 7) & 1; \
} while(0)
```
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