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Why does C++ code for testing the Collatz conjecture run faster than hand-written assembly?

I wrote these two solutions for Project Euler Q14, in assembly and in C++. They implement identical brute force approach for testing the ...

April 18, 2022
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable ...

April 12, 2022
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Is < faster than

Is if (a < 901) faster than if (a <= 900)? Not exactly as in this simple example, but there are slight performance ...

April 11, 2022
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Why doesn’t GCC optimize aaaaaa to (aaa)(aaa)?

I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by ...

April 10, 2022
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