alamb commented on code in PR #9848:
URL: https://github.com/apache/arrow-rs/pull/9848#discussion_r3501910153
##########
parquet/src/util/bit_util.rs:
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@@ -936,6 +936,44 @@ impl From<Vec<u8>> for BitReader {
}
}
+/// Parallel bit extract: for each set bit in `mask`, extract the
+/// corresponding bit from `value` and pack them contiguously into the low
+/// bits of the return value.
+///
+/// Equivalent to the x86 BMI2 `PEXT` instruction. When compiled with the
+/// `bmi2` target feature enabled (for example `-C target-cpu=x86-64-v3`)
+/// this lowers to the hardware `pext` instruction; otherwise it falls back
+/// to a portable scalar loop.
+///
+/// Replace with `value.compress(mask)` when `uint_gather_scatter_bits`
+/// is stabilised: <https://github.com/rust-lang/rust/issues/149069>
+#[inline]
Review Comment:
I think @devanbenz is working on something like this in
- https://github.com/apache/arrow-rs/pull/10136
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