fast_length3clc

float fast_length(floatn p);

Overview

Returns the length of vector p computed as:

sqrt(3clc)(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(3clc) or fma(3clc).

Specification

OpenCL Specification[1]

Notes

1.

OpenCL Specification

page 262, section 6.12.5 - Geometric Functions