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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
I've been profiling some of our core math on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!...
RGB to hex and hex to RGB
How to convert colors in RGB format to hex format and vice versa?
50 Answers
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How can I split a comma delimited string into an array in PHP?
I need to split my string input into an array at the commas.
10 Answers
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Python vs Cpython
What's all this fuss about Python and CPython (Jython,IronPython) , I don't get it:
9 Answers
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Peak signal detection in realtime timeseries data
Update: The best performing algorithm so far is this one .
33 Answers
33
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Obfuscated C Code Contest 2006. Please explain sykes2.c
How does this C program work?
4 Answers
4
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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
In multiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a go...
What is a git topic branch?
What is a git topic branch? Does it differ from an ordinary branch in some way? Are there any branches that are not topic branches?
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How can I add a PHP page to WordPress?
I want to create a custom page for my WordPress blog that will execute my PHP code in it, whilst remaining a part of the overall site CSS/theme/design.
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Download file from an ASP.NET Web API method using AngularJS
In my Angular JS project, I've an <a> anchor tag, which when clicked makes an HTTP GET request to a WebAPI method that returns a file.
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