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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
... for the processor to parallelize different loop iterations.
The unsigned vs. uint64_t and other tweaks don't directly affect the problem. But they influence the register allocator which assigns the registers to the variables.
In your case, the speeds are a direct result of what is stuck to the (f...
What is the correct way of using C++11's range-based for?
...t's start differentiating between observing the elements in the container
vs. modifying them in place.
Observing the elements
Let's consider a simple example:
vector<int> v = {1, 3, 5, 7, 9};
for (auto x : v)
cout << x << ' ';
The above code prints the elements (ints) in...
How can I efficiently select a Standard Library container in C++11?
... a member function rather than the one from <algorithm>. As for O(1) vs O(log n), it does not affect semantics; I'll remove the "efficiently" from the example and replace it with "easily".
– Matthieu M.
May 22 '12 at 12:22
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Move capture in lambda
...es (myPointer in this case). Therefore the above code does not compile in VS2013. It woks fine in GCC 4.8 though.
– Alan
Dec 2 '15 at 18:07
add a comment
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HTML5 Canvas Resize (Downscale) Image High Quality?
...be nice here, but i don't have one. )
Here's an example of canvas scale vs my pixel perfect scale on a 1/3 scale of a zombat.
Notice that the picture might get scaled in your Browser, and is .jpegized by S.O..
Yet we see that there's much less noise especially in the grass behind the wombat, and...
How can I determine whether a 2D Point is within a Polygon?
...ee floating point values per polygon side in memory. It's a typical memory vs computation time trade off.
Last but not least: If you may use 3D hardware to solve the problem, there is an interesting alternative. Just let the GPU do all the work for you. Create a painting surface that is off screen....
Differences between Java 8 Date Time API (java.time) and Joda-Time
...t format. The old library folder lib/zi does not exist any more.
Adjuster vs. Property
JSR-310 has introduced the TemporalAdjuster-interface as a formalized way to externalize temporal calculations and manipulations, especially for library or framework-writers this is a nice and relative easy way ...
Is Unit Testing worth the effort? [closed]
...
community wiki
7 revs, 6 users 87%reefnet_alex
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Create an index on a huge MySQL production table without table locking
... 0m0.009s
9 real 0m0.009s
10 real 0m0.009s
11 real 0m0.009s
Vs read operations which don't block (swap the line comment in the script):
1 real 0m0.010s
2 real 0m0.009s
3 real 0m0.009s
4 real 0m0.010s
5 real 0m0.009s
Index Update - START
6 real 0m0.010s
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Does PHP have threading?
...n php but you should use multiprocessing instead.
Backgroud info: threads vs. processes
There is always a bit confusion about the distinction of threads and processes, so i'll shortly describe both:
A thread is a sequence of commands that the CPU will process. The only data it consists of is a p...