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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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How to know if other threads have finished?
I have an object with a method named StartDownload() , that starts three threads.
12 Answers
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Can a recursive function be inline?
As I was reading this , found that the above code would lead to "infinite compilation" if not handled by compiler correctly.
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How to pick just one item from a generator?
I have a generator function like the following:
7 Answers
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Why does Double.NaN==Double.NaN return false?
I was just studying OCPJP questions and I found this strange code:
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Good ways to manage a changelog using git?
I've been using Git for a while now, and I recently started using it to tag my releases so that I could more easily keep track of changes and be able to see which version each of our clients are running (unfortunately the code currently mandates that each client have their own copy of the PHP site; ...
Optimizing away a “while(1);” in C++0x
Updated, see below!
8 Answers
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How many random elements before MD5 produces collisions?
I've got an image library on Amazon S3. For each image, I md5 the source URL on my server plus a timestamp to get a unique filename. Since S3 can't have subdirectories, I need to store all of these images in a single flat folder.
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If a DOM Element is removed, are its listeners also removed from memory?
If a DOM Element is removed, are its listeners removed from memory too?
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Which is more efficient, a for-each loop, or an iterator?
Which is the most efficient way to traverse a collection?
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