July 2002
Intermediate to advanced
320 pages
8h 15m
English
Content preview from Hacker's Delight
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2-19. Exchanging Registers
A very old trick is that of exchanging the contents of two registers without using a third [IBM]:
This works well on a two-address machine. The trick also works if ⊕ is replaced by the ≡ logical operation (complement of exclusive or), and can be made to work in various ways with add’s and subtract’s:
Unfortunately, each of these has an instruction that is unsuitable for a two-address machine, unless the machine has “reverse subtract.”
This little trick can actually be useful in the application of double buffering, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.