wesm commented on a change in pull request #7285:
URL: https://github.com/apache/arrow/pull/7285#discussion_r433296380
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File path: cpp/src/arrow/util/bit_util.cc
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@@ -246,6 +246,49 @@ bool BitmapEquals(const uint8_t* left, int64_t
left_offset, const uint8_t* right
}
// Unaligned slow case
+ left += left_offset / 8;
+ right += right_offset / 8;
+ left_offset %= 8;
+ right_offset %= 8;
+
+ // process in 64 bits
+ int64_t nwords = bit_length / 64;
Review comment:
FWIW I think `nwords` is fine, we use `nbytes` in plenty of places.
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