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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
... its single dependency, meaning it can begin execution quicker and retire, freeing up execution units. Furthermore, it also allows for more efficient zero idioms like xor eax, eax to zero rax without requiring a REX byte.
s...
Why does my application spend 24% of its life doing a null check?
...sses slow down your memory accesses by 10%. In addition, if you only have free memory on a single NUMA node, all the processes needing memory on the starved node will be allocated memory from the other node which accesses are more expensive. Even worst, the operating system could think it is a goo...
What does the git index contain EXACTLY?
...ve marked points which I'm not sure / haven't found with TODO: please feel free to complement those points.
As others mentioned, the index is stored under .git/index, not as a standard tree object, and its format is binary and documented at: https://github.com/git/git/blob/master/Documentation/tech...
Which is faster: while(1) or while(2)?
...he jump is absolute and unconditional for both while(1) and while(2). Feel free to test the others yourself if you're actually concerned.
– ApproachingDarknessFish
Jul 26 '14 at 4:35
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Architecture for merging multiple user accounts together
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Most of the posts are quite old and I guess Google's free Firebase Authentication service wasn't yet around. After verifying with OAuth, you pass the OAuth token to it and get a unique user id which you can store for reference. Supported providers are Google, Facebook, Twitter,...
How does SSL really work?
...written a small blog post which discusses the process briefly. Please feel free to take a look.
SSL Handshake
A small snippet from the same is as follows:
"Client makes a request to the server over HTTPS. Server sends a copy of its SSL certificate + public key. After verifying the identity of th...
Best practices for reducing Garbage Collector activity in Javascript
... than allocating fresh ones in each iteration. Pool common object types in free lists rather than abandoning them. Cache string concatenation results that are likely reusable in future iterations. Avoid allocation just to return function results by setting variables in an enclosing scope instead. ...
What are differences between AssemblyVersion, AssemblyFileVersion and AssemblyInformationalVersion?
...why I only put my format as an example, based on Semantic Versioning. Your free to use the Microsoft way or your own way of course.
– Rémy van Duijkeren
Jan 25 '14 at 22:49
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Caveats of select/poll vs. epoll reactors in Twisted
...lecting on a single fd, 50. Adding more fds below the highest isn't quite free, so it's a little more complicated than this in practice, but this is a good first approximation for most implementations.
The cost of epoll is closer to the number of file descriptors that actually have events on them....
What are the typical reasons Javascript developed on Firefox fails on IE? [closed]
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Please feel free to update this list if you see any errors/omissions etc.
Note: IE9 fixes many of the following issues, so a lot of this only applies to IE8 and below and to a certain extent IE9 in quirks mode. For example, IE9 support...