How can I reverse the bits of a 64 bit integer?

Asked Mar 30 '21 at 16:41

Active Mar 30 '21 at 16:57

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Given an unsigned 64-bit integer such as:

10000000000000000000000000000000000000000000000000000000000000000

How can I efficiently reverse the bits into something like this?

00000000000000000000000000000000000000000000000000000000000000001

edited Mar 30 '21 at 16:44

Dave Newton

asked Mar 30 '21 at 16:41

Levi Gibson

1

related https://stackoverflow.com/questions/2602823/in-c-c-whats-the-simplest-way-to-reverse-the-order-of-bits-in-a-byte/2602885 – 463035818_is_not_an_ai Mar 30 '21 at 16:42
Expanding from https://stackoverflow.com/questions/2602823/in-c-c-whats-the-simplest-way-to-reverse-the-order-of-bits-in-a-byte/2602885, I created http://coliru.stacked-crooked.com/a/42dd5c2497929e4f but its not exactly _efficient_ – Mooing Duck Mar 30 '21 at 17:05

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