vector.atomic.reduce

← vector dialect

Atomic no-result scatter reduction/update into per-lane signed element offsets. Each lane atomically combines its value into origin + offsets[lane]; duplicate active addresses are valid and are serialized by the required ordering and scope attributes.

Operation contract

Property	Value
Semantic phase	—
Interfaces	MemoryAccess
Memory effects	readwrite view

Signature

Kind	Name	Type	Cardinality	Description
Operand	value	vector	required	Vector contribution for each lane.
Operand	view	view	required	Typed destination view.
Operand	offsets	vector	required	Per-lane signed element offsets from the logical origin.
Operand	indices	index	variadic	Dynamic logical origin indices.
Attribute	kind	enum AtomicKind	required	—
Attribute	ordering	enum AtomicOrdering	required	Required atomic memory ordering.
Attribute	scope	enum AtomicScope	required	Required atomic synchronization scope.
Attribute	cache_scope	enum CacheScope	optional	Optional cache/coherency scope required by target lowering.
Attribute	cache_temporal	enum CacheTemporal	optional	Optional temporal cache policy required by target lowering.
Attribute	static_indices	i64_array	required	Static logical origin indices with INT64_MIN sentinels for dynamics.

Verification constraints

• HasIndexOrNonI1IntegerElement(offsets)
• SameElementType(value, view)
• SameShape(offsets, value)

Examples

vector.atomic.reduce<addi> %v, %view[%row, %col][%offsets] {ordering = relaxed, scope = workgroup} : vector<4xi32>, view<[%m]x[%n]xi32, %layout>, vector<4xindex>