Function bitintr::x86::abm::popcnt

pub fn popcnt<T: Int>(x: T) -> T

Counts the bits that are set.

Keywords: Population count, count ones, Hamming weight, Sideways sum.

Assembly Instructions

• POPCNT:
  • Description: Population Count.
  • Architecture: x86.
  • Instruction set: ABM, SSE 4.2.
  • Registers: 16/32/64 bit.
  • Note: Intel considers it part of SSE4.2 but advertises it with its own CPUID flag.

Example

use bitintr::x86::abm::*;
assert_eq!(popcnt(0b0101_1010u16), 4);
assert_eq!(0b0101_1010u16.popcnt(), 4);