--- layout: stdlib-reference --- # rsqrt ## Description Reciprocal of square root. ## Signature

T rsqrt<T>(T x)
    where T : __BuiltinFloatingPointType;

vector<T, N> rsqrt<T, int N>(vector<T, N> x)
    where T : __BuiltinFloatingPointType;

matrix<T, N, M> rsqrt<T, int N, int M>(matrix<T, N, M> x)
    where T : __BuiltinFloatingPointType;

## Generic Parameters #### T: [\_\_BuiltinFloatingPointType](../interfaces/0_builtinfloatingpointtype-029hm/index.html) #### N : int #### M : int ## Parameters #### x : [T](rsqrt.html#typeparam-T) The value to compute the reciprocal square root of. #### x : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The value to compute the reciprocal square root of. #### x : [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)\> The value to compute the reciprocal square root of. ## Return value The reciprocal square root of x. ## Availability and Requirements Defined for the following targets: #### hlsl Available in all stages. #### glsl Available in all stages. #### cpp Available in all stages. #### cuda Available in all stages. #### metal Available in all stages. #### wgsl Available in all stages. #### spirv Available in all stages. #### llvm Available in all stages.