Vector length.

float length(float n p)

double length(double n p)
half length (gentype p)      // if half extension enabled

Description

Returns the length of vector p, i.e., the square root of (p.x2 + p.y2 + …​)

Notes

General information about built-in geometric functions: Built-in geometric functions operate component-wise. The description is per-component. floatn is float, float2, float3, or float4 and doublen is double, double2, double3, or double4. The built-in geometric functions are implemented using the round to nearest even rounding mode.

The geometric functions can be implemented using contractions such as mad or fma.

If extended with cl_khr_fp16, generic type name gentype may indicate half and half{2|3|4} as arguments.

Also see

Specification