assembly

Using popcnt instruction found on newer processors to get population count which is number of set bits. Reference : SSE4 Here are couple example inputs with expected output. 0xA = 1010 — > 2 0x3F2 = 1111110010 — > 7 #include <iostream> #include <stdio.h>   using namespace std;   int main() { // 0xA = …

Population Count using popcnt instruction (counting number of on bits) Read More »

This is program demonstrates how to use ‘cpuid’ assembly instruction on x86 to retrieve cache line size. This is done in c++ and it uses the inline assembly to execute the instructions, compiled with gcc on win32. Really we are only interested in Cache line information which can be found using 0x80000006 code and its …

Using ‘cpuid’ instructions to get cache line size Read More »