--- layout: stdlib-reference --- # WaveActiveSum ## Description ## Signature

T WaveActiveSum<T>(T expr)
    where T : __BuiltinArithmeticType;

vector<T, N> WaveActiveSum<T, int N>(vector<T, N> expr)
    where T : __BuiltinArithmeticType;

matrix<T, N, M> WaveActiveSum<T, int N, int M>(matrix<T, N, M> expr)
    where T : __BuiltinArithmeticType;

## Generic Parameters #### T: [\_\_BuiltinArithmeticType](../interfaces/0_builtinarithmetictype-029j/index.html) #### N : int #### M : int ## Parameters #### expr : [T](waveactivesum-04a.html#typeparam-T) #### expr : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> #### expr : [matrix](../types/matrix/index.html)\<[T](../types/matrix/t-0.html), [N](../types/matrix/index.html#decl-N), [M](../types/matrix/index.html#decl-M)\> ## Availability and Requirements Defined for the following targets: #### hlsl Available in all stages. #### glsl Available in all stages. #### cuda Available in all stages. #### metal Available in all stages. #### wgsl Available in all stages. #### spirv Available in all stages. Requires capability: `spvGroupNonUniformArithmetic`.