Enum Tier 

pub enum Tier {
    T0 = 0,
    T1 = 1,
    T2 = 2,
    T3 = 3,
}

A hotness tier — how much optimization budget a unit has earned (HOTSWAP §4.1). Each tier pays for strictly more than the one below; T3 with an all-on config reproduces today’s whole-program optimize_for_run, bit-for-bit (the compatibility + soundness anchor). The mechanism that escalates a unit through the tiers (call/back-edge counters, thresholds) lives in the VM; this is just the policy the optimizer reads.

Variants

T0 = 0

Baseline: raw parse → bytecode, no optimization.

T1 = 1

Warm: Cheap opts.

T2 = 2

Hot: Cheap + Medium opts (PE-light).

T3 = 3

Very-hot: every opt (PE-full, unroll, recursion unfold).

Implementations

impl Tier

pub fn budget(self) -> Option<OptCost>

The most expensive pass this tier will pay for; None ⇒ optimize nothing. The inclusion order T1 ⊂ T2 ⊂ T3 falls straight out of OptCost’s Ord.

Trait Implementations

impl Clone for Tier

fn clone(&self) -> Tier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Tier

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

Formats the value using the given formatter.

impl Ord for Tier

fn cmp(&self, other: &Tier) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Tier

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Tier

fn partial_cmp(&self, other: &Tier) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Tier

impl Eq for Tier

impl StructuralPartialEq for Tier