Struct HashMapJudge 

pub struct HashMapJudge { /* private fields */ }

HashMap-backed JudgeOracle. The simplest possible impl — callers (and tests) populate it from a ProfileReport or equivalent and hand it to super::cost::compute_static_costs.

Production callers typically use this directly: fuel_core’s integration computes a HashMapJudge from the cached ProfileReport once at plan-start and feeds the same instance to every compile_plan call until the topology generation changes.

Implementations

impl HashMapJudge

pub fn new() -> Self

Empty map. Add entries via Self::insert.

pub fn insert( &mut self, op: OpKind, dtype: DType, size_class: SizeClass, backend: BackendId, kernel_source: &str, latency_ns: u64, kernel_revision_hash: u64, )

Insert one measured latency. Replaces any prior entry with the same key (last-write-wins, mirroring the conventions in fuel_tensor::judge::DispatchTable::rebuild_from).

kernel_source distinguishes sibling kernels at the same (backend, device) slot — see JudgeOracle::measured_latency_ns. The owned String is stored as part of the key; pass "" for legacy single-impl cells. kernel_revision_hash is last in the parameter list (after the latency_ns value) deliberately: the key tuple’s canonical order keeps it beside kernel_source, but placing it last here lets the many existing call sites append the argument rather than splice it mid-call. 0 is the untracked / single-impl default.

pub fn len(&self) -> usize

Total number of populated cells.

pub fn is_empty(&self) -> bool

Is the map empty?

Trait Implementations

impl Clone for HashMapJudge

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 HashMapJudge

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

Formats the value using the given formatter.

impl Default for HashMapJudge

fn default() -> Self

Returns the “default value” for a type.

impl JudgeOracle for HashMapJudge

fn measured_latency_ns( &self, op: OpKind, dtype: DType, size_class: SizeClass, backend: BackendId, kernel_source: &str, kernel_revision_hash: u64, ) -> Option<u64>

Median wall-clock latency in nanoseconds for the (op, dtype, size_class, backend, kernel_source, kernel_revision_hash) cell. Returns None when the cell isn’t profiled. Callers MUST treat absence as “no measurement” — not “zero” — so the static estimate stays the fallback.