Struct ChangeDelta 

pub struct ChangeDelta {
    pub lo_word: usize,
    pub old_a: Vec<u64>,
    pub old_b: Vec<u64>,
    pub new_a: Vec<u64>,
    pub new_b: Vec<u64>,
}

The bits one committed update changed, as plane words (aval/bval, the Wide encoding): lo_word is the plane-word index of old_a[0], so a windowed update of a huge vector carries only the words it touched. A bit/part-select event control (LRM 9.4.2) compares the selected bits of old and new to decide whether its operand changed, and takes an edge on the select’s least-significant bit.

Fields

lo_word: usize

old_a: Vec<u64>

old_b: Vec<u64>

new_a: Vec<u64>

new_b: Vec<u64>

Implementations

impl ChangeDelta

pub fn between(old: &FourStateValue, new: &FourStateValue) -> Self

The delta between two whole values (the narrow inline word and the wide planes both decode to aval/bval).

pub fn bit(&self, index: u32) -> Option<((bool, bool), (bool, bool))>

Bit index of the value before and after, as (aval, bval) pairs; a bit outside the carried words did not change (None).

pub fn range_changed(&self, lsb: u32, width: u32) -> bool

Whether any bit of [lsb, lsb + width) differs, in either plane.

Trait Implementations

impl Clone for ChangeDelta

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChangeDelta

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

Formats the value using the given formatter.

impl Default for ChangeDelta

fn default() -> Self

Returns the “default value” for a type.