Notes
Built-in geometric functions operate component-wise and the description is per-component.
The type name floatn indicates that the function can take float,
float2, float3, 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.
If extended with cl_khr_fp64, generic type name gentype may indicate double and double{2|3|4} as arguments. If extended with cl_khr_fp16, generic type name gentype may indicate half and half{2|3|4} as arguments.
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