Struct Counts 

pub struct Counts { /* private fields */ }

What the walks have cost, which section 9.7 asks for as its own counter.

The walk is charged to whichever pass made it, so -ftime-report shows it under GVN and PRE and not under memory SSA. That is misleading, and the fix section 9.7 asks for is to report the step count separately from the wall time, because it is the thing to look at when a pathological input turns up.

Implementations

impl Counts

pub const fn walks(&self) -> u64

How many walks were made.

pub const fn steps(&self) -> u64

How many defs those walks looked at, which is one alias query each.

pub const fn exhausted(&self) -> u64

How many walks ended by running out of budget.

This is the number section 9.3 says decides whether the cache gets built. Above one percent of walks and the budget is too small or the alias analysis is too weak.

pub const fn rewritten(&self) -> u64

How many times a caller rewrote the reference and the walk carried on with the new one.

A rewrite starts a walk of its own, so this is both how much work the translate callback is asking for and how much it is getting, and it is the counter that says whether the callback is doing anything at all on a given build.

Trait Implementations

impl Clone for Counts

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Counts

impl Debug for Counts

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

Formats the value using the given formatter.

impl Default for Counts

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Counts

impl PartialEq for Counts

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Counts