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       abs,_abs_diff - Absolute value functions.

       ugentype abs(gentype x);

       ugentype abs_diff(gentype x, gentype y);


       abs returns |x|.

       abs_diff returns |x-y| without modulo overflow.


       Built-in integer functions take scalar or vector arguments. The vector
       versions of the integer functions operate component-wise. The
       description is per component.

       We use the generic type name gentype to indicate that the function can
       take char, char{2|3|4|8|16}, uchar, uchar{2|3|4|8|16}, short,
       short{2|3|4|8|16}, ushort, ushort{2|3|4|8|16}, int, int{2|3|4|8|16},
       uint, uint{2|3|4|8|16}, long, long{2|3|4|8|16}, ulong, or
       ulong{2|3|4|8|16} as the type for the arguments. We use the generic
       type name ugentype to refer to unsigned versions of gentype. For
       example, if gentype is char4, ugentype is uchar4.

       We also use the generic type name sgentype to indicate that the
       function can take a scalar data type i.e.  char, uchar, short, ushort,
       int, uint, long, or ulong as the type for the arguments. For built-in
       integer functions that take gentype and sgentype arguments, the gentype
       argument must be a vector or scalar version of the sgentype argument.
       For example, if sgentype is uchar, gentype must be uchar or
       uchar{2|3|4|8|16}. For vector versions, sgentype is implicitly widened
       to gentype as described in section 6.3.a of the OpenCL specification.

       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.


       OpenCL Specification[1]




       The Khronos Group


       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a
       copy of this software and/or associated documentation files (the
       "Materials"), to deal in the Materials without restriction, including
       without limitation the rights to use, copy, modify, merge, publish,
       distribute, sublicense, and/or sell copies of the Materials, and to
       permit persons to whom the Materials are furnished to do so, subject to
       the condition that this copyright notice and permission notice shall be
       included in all copies or substantial portions of the Materials.


        1. OpenCL Specification
           page 256, section 6.12.3 - Integer Functions

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