popcnt

Question

popcnt

Opened this issue 6 years ago · 2 comments

What should I do if the processor does not support the POPCNT instruction and an error (0xC000001D: Illegal Instruction) appears in Util.h >> bitCount (unsigned x) >> return __popcnt (x)?

Answer 1 · 2018-12-08T13:53:38.000Z

I found a way to solve this problem. Instead of popcnt() use std::bitset::count(). It would be interesting to compare the performance of these two methods.

Answer 2 · 2022-10-17T20:31:14.000Z

So can you show what exactly edit to run lib on non sse4.2 CPU what dont support popcnt ?