abs, abs_diff

Absolute value functions.

ugentype abs ( gentype x)
ugentype abs_diff ( gentype x,
  gentype y)

Description

abs returns |x|.

abs_diff returns |x-y| without modulo overflow.

Notes

Built-in integer functions can be used to take scalar or vector arguments. We use the generic type name gentype to indicate that the function can take char, char{2|4|8|16}, uchar, uchar{2|4|8|16}, short, short{2|4|8|16}, ushort, ushort{2|4|8|16}, int, int{2|4|8|16}, uint, uint{2|4|8|16}, long, long{2|4|8|16}, ulong, or ulong{2|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.

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.

Specification

OpenCL Specification

Also see

Integer Functions

Copyright © 2007-2009 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.