How can I determine if a .NET assembly was built for x86 or x64?
I’ve got an arbitrary list of .NET assemblies. I need to programmatically check if each DLL was built for x86 (as opposed to … Read more
x86
What’s the purpose of the LEA instruction?
For me, it just seems like a funky MOV. What’s its purpose and when should I use it? 17 s 17
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 … Read more
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 … Read more
Why are elementwise additions much faster in separate loops than in a combined loop?
Suppose a1, b1, c1, and d1 point to heap memory, and my numerical code has the following core loop. const int n = … Read more