sdk/1.1/docs/man/geometricFunctionsInc.xml

        <para>
            Built-in geometric functions operate component-wise and the description is per-component. 
            The type name <type>float</type><replaceable>n</replaceable> indicates that the function can take <type>float</type>, 
            <type>float2</type>, <type>float3</type>, or <type>float4</type> as the type 
            for the arguments.
        </para>
        <para>
            The built-in geometric functions are implemented using the round to nearest even rounding mode.
        </para>
        <para>
            The geometric functions can be implemented using contractions such as
            <citerefentry><refentrytitle>mad</refentrytitle></citerefentry> or 
            <citerefentry><refentrytitle>fma</refentrytitle></citerefentry>.
        </para>