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//! popcnt
/// Count bits set.
pub trait Popcnt {
/// Counts the bits that are set.
///
/// **Keywords**: Population count, count ones, Hamming weight, Sideways
/// sum.
///
/// # Instructions
///
/// - [`POPCNT`](http://www.felixcloutier.com/x86/POPCNT.html):
/// - 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::*;
/// assert_eq!(0b0101_1010u16.popcnt(), 4);
/// ```
fn popcnt(self) -> Self;
}
macro_rules! impl_popcnt {
($id:ident) => {
impl Popcnt for $id {
#[inline]
fn popcnt(self) -> Self {
self.count_ones() as Self
}
}
};
}
impl_all!(
impl_popcnt: u8,
u16,
u32,
u64,
i8,
i16,
i32,
i64
);