Github user michaelkamprath commented on the issue: https://github.com/apache/spark/pull/16403 I've refactored this issue's solution using the idea that @kiszk supplied above. This ended up being a better idea, thanks. It produced cleaner code than my original allocated buffer approach. Also, based on the input that this solution should have zero impact on the x86 platform, I've refactored to a functor design pattern which creates the equivalent performance behavior for x86 as before this fix. The performance impact of the using an intermediate long as a buffer when fetching a double from a memory block looks to be about 10%. I ran some performance tests writing and reading random doubles to random aligned locations in a buffer 100M times over. On my mac laptop and an ARM unit, the performance difference was the long-buffered approach was about 10% slower than the original direct fetch approach. However, since the this refactor isolates the fetching behavior into a functor, the 10% slowdown only affects the ARM platform. I also added some unit tests if only to convince myself I hadn't broken anything.
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