<para> | |
General information about built-in integer functions: | |
<!-- section 6.13.3 --> 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> | |
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> | |
<!-- 28-Oct-2015, C lang ver 2.0 rev 30 --> | |