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<para>
<!-- core spec. p. 263, section 6.12.3 --> Built-in integer functions take
scalar or vector arguments. The vector versions of the integer functions operate
component-wise. The description is per component.
</para>
<para>
We use the generic type name <type>gentype</type> to indicate that the function
can take <type>char</type>, <type>char{2|3|4|8|16}</type>, <type>uchar</type>,
<type>uchar{2|3|4|8|16}</type>, <type>short</type>, <type>short{2|3|4|8|16}</type>,
<type>ushort</type>, <type>ushort{2|3|4|8|16}</type>, <type>int</type>,
<type>int{2|3|4|8|16}</type>, <type>uint</type>, <type>uint{2|3|4|8|16}</type>,
<type>long</type>, <type>long{2|3|4|8|16}</type>, <type>ulong</type>, or
<type>ulong{2|3|4|8|16}</type> as the type for the arguments. We use the generic type
name <type>ugentype</type> to refer to unsigned versions of <type>gentype</type>. For
example, if <type>gentype</type> is <type>char4</type>, <type>ugentype</type> is
<type>uchar4</type>.
</para>
<para><!-- core spec p. 253 references section 6.3.a, which doesn't seem to exist in the spec -->
We also use the generic type name <type>sgentype</type> to indicate that the function can
take a scalar data type i.e. <type>char</type>, <type>uchar</type>, <type>short</type>,
<type>ushort</type>, <type>int</type>, <type>uint</type>, <type>long</type>, or
<type>ulong</type> as the type for the arguments. For built-in integer functions that
take <type>gentype</type> and <type>sgentype</type> arguments, the <type>gentype</type>
argument must be a vector or scalar version of the <type>sgentype</type> argument. For
example, if <type>sgentype</type> is <type>uchar</type>, <type>gentype</type>
must be <type>uchar</type> or <type>uchar{2|3|4|8|16}</type>. For vector versions,
<type>sgentype</type> is implicitly widened to <type>gentype</type> as described in section 6.3.a
of the OpenCL specification.
</para>
<para>
For any specific use of a function, the actual type has to be the same for all
arguments and the return type unless otherwise specified.
</para>
<!-- 12-Oct-2011 -->
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