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<para>
If an implementation extends this specification to support IEEE-754 flags or
exceptions, then all built-in relational functions shall proceed without raising the
<varname>invalid</varname> floating-point exception when one or more of the operands
are NaNs.
</para>
<para>
The built-in relational functions are extended with
<citerefentry><refentrytitle>cl_khr_fp16</refentrytitle></citerefentry> to
include appropriate versions of functions that take <type>half</type>, and
<type>half{2|3|4|8|16}</type> as arguments and return values.
</para>
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