fast_length

Vector length.

float fast_length ( gentype p)

Description

Returns length of vector p computed as:

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

Notes

Built-in geometric functions operate component-wise and the description is per-component. The generic type name gentype indicates that the function can take float, float2, or float4 as the type for the arguments.

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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