Struct memchr::vector::SensibleMoveMask

pub(crate) struct SensibleMoveMask(u32);

This is a “sensible” movemask implementation where each bit represents whether the most significant bit is set in each corresponding lane of a vector. This is used on x86-64 and wasm, but such a mask is more expensive to get on aarch64 so we use something a little different.

We call this “sensible” because this is what we get using native sse/avx movemask instructions. But neon has no such native equivalent.

Tuple Fields

0: u32

Implementations

impl SensibleMoveMask

fn get_for_offset(self) -> u32

Get the mask in a form suitable for computing offsets.

Basically, this normalizes to little endian. On big endian, this swaps the bytes.

Trait Implementations

impl Clone for SensibleMoveMask

fn clone(&self) -> SensibleMoveMask

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SensibleMoveMask

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl MoveMask for SensibleMoveMask

fn all_zeros_except_least_significant(n: usize) -> SensibleMoveMask

Return a mask that is all zeros except for the least significant n lanes in a corresponding vector.

fn has_non_zero(self) -> bool

Returns true if and only if this mask has a a non-zero bit anywhere.

fn count_ones(self) -> usize

Returns the number of bits set to 1 in this mask.

fn and(self, other: SensibleMoveMask) -> SensibleMoveMask

Does a bitwise and operation between self and other.

fn or(self, other: SensibleMoveMask) -> SensibleMoveMask

Does a bitwise or operation between self and other.

fn clear_least_significant_bit(self) -> SensibleMoveMask

Returns a mask that is equivalent to self but with the least significant 1-bit set to 0.

fn first_offset(self) -> usize

Returns the offset of the first non-zero lane this mask represents.

fn last_offset(self) -> usize

Returns the offset of the last non-zero lane this mask represents.

impl Copy for SensibleMoveMask