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Date: Mon, 27 Jan 2014 19:00:58 -0500
From: Bill Cox <waywardgeek@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Combining sliding window and bit-reversal

The Catena code does it this way:

- swap 4 bytes little-endian to big-endian style - 4 cycles max, or 1
in parallel.
- swap each upper nibble with the lower nibble:
    x = ((x & F0F0F0F0) >> 4) | ((x & 0x0F0F0F0F) << 4)
- swap bit pairs...

you get the idea.

It's just a few cycles.  Once per memory block, and it's no problem.

Bill

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