fast_length

Vector length.

float fast_length ( floatn p)

Description

Returns the length of vector p computed as:

half_sqrt(p.x2 + p.y2 + ...)

Notes

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.

Specification

OpenCL Specification

Also see

Geometric Functions

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