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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...r the cases when an approximation suffices, but speed is required. If you read Intel's documentation, you will also find an instruction sequence (reciprocal square-root approximation followed by a single Newton-Raphson step) that gives nearly full precision (~23 bits of accuracy, if I remember prop...
PHP script to loop through all of the files in a directory?
.../to/files";
if ($handle = opendir($path)) {
while (false !== ($file = readdir($handle))) {
if ('.' === $file) continue;
if ('..' === $file) continue;
// do something with the file
}
closedir($handle);
}
?>
...
How to see query history in SQL Server Management Studio
...e queries executed in SSMS by default. There are several options though.
Reading transaction log – this is not an easy thing to do because its in proprietary format. However if you need to see queries that were executed historically (except SELECT) this is the only way.
You can use third party...
IsNothing versus Is Nothing
...ng' rather than "Not IsNothing(object)" which I personally feel looks more readable.
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Which one will execute faster, if (flag==0) or if (0==flag)?
...
I haven't seen any correct answer yet (and there are already some) caveat: Nawaz did point out the user-defined trap. And I regret my hastily cast upvote on "stupidest question" because it seems that many did not get it right and it gives room for a nice discussion on compiler op...
JavaScript module pattern with example [closed]
...ction scope always. This means that any variable in outer function will be read always. It will not read the global variable (if any) with the same name. This is also one of the objective of using modular design pattern avoiding naming conflict.
var scope = "I am global";
function whatismyscope() ...
How do I serialize an object and save it to a file in Android?
...s = new ObjectInputStream(fis);
SimpleClass simpleClass = (SimpleClass) is.readObject();
is.close();
fis.close();
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XML attribute vs XML element
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I read through some of the answers and something that wasn't stressed enough form my experience is that if you data in an "attribute" and suddenly has a > or < you XML document will break I think there are five ascii char...
do {…} while(false)
...he function exits.
It can make a tiresome if/else-if tree a lot easier to read, by just having to break whenever an exit point is reached, with the rest of the logic inline afterwards.
This pattern is also useful in languages that don't have a goto statement. Perhaps that's where the original prog...
How does this site infecting script work?
...answering the question but still +1, as this was indeed a very interesting read and good suggestions made. Ta
– Peter Perháč
Jan 22 '10 at 23:48
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