view.atomic.rmw

← view dialect

Atomically read one scalar view element, combine it with a scalar update value, write the combined value back, and return the old value observed by that atomic operation.

Operation contract

Property	Value
Semantic phase	executable
Target contracts	memory.atomic
Interfaces	MemoryAccess
Memory effects	readwrite view

Signature

Kind	Name	Type	Cardinality	Description
Operand	value	scalar	required	Scalar update value.
Operand	view	view	required	Typed destination view.
Operand	indices	index	variadic	Dynamic logical element indices.
Result	result	scalar	required	Old memory value read by the atomic operation.
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 element indices with INT64_MIN sentinels for dynamics.

Verification constraints

• SameElementType(value, view, result)
• SameType(value, result)

Examples

%old = view.atomic.rmw<addi> %value, %view[%row, %col] {ordering = relaxed, scope = workgroup} : i32, view<[%M]x[%N]xi32, %layout> -> i32