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By dotCore
via randomascii.wordpress.com
Submitted: Dec 30 2012 / 02:44

Zeroing out a CPU register seems like the simplest and most basic operation imaginable, but in fact x86 CPUs contain a surprising amount of special logic to make this operation run smoothly. The most obvious way of zeroing an x86 CPU register turns out to not be the best, and the alternative has some surprising characteristics.
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