December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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SSE and Floating Point in the Kernel
Streaming SIMD Extensions (SSE) is the successor to MMX and is a special instruction set found on most modern Intel and AMD processors that allow common instructions such as add, multiply, and shift to be performed on arrays (vectors) of values instead of single values (scalar). This can greatly speed up many computation tasks, especially in areas such as digital signal processing, audio, graphics, and video. Normally the kernel is not a great place to perform heavy computation, but there are some areas where it is unavoidable—for example, in the case of audio drivers, which need to convert audio samples from multiple user space applications and mix them into a single buffer for output. Software implementations ...
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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.