NAME

       Integer_Built-In_Functions - Click an item in the table below for details about that
       function.

       ┌───────────────────┬──────────────────────────────────┐
       │abs(3clc)          │ |x|                              │
       ├───────────────────┼──────────────────────────────────┤
       │abs(3clc)          │ |x-y| without modulo overflow    │
       ├───────────────────┼──────────────────────────────────┤
       │add_sat(3clc)      │ x+y and saturate result          │
       ├───────────────────┼──────────────────────────────────┤
       │hadd(3clc)         │ (x+y) >> 1 without modulo        │
       │                   │ overflow                         │
       ├───────────────────┼──────────────────────────────────┤
       │hadd(3clc)         │ (x+y+1) >> 1. The intermediate   │
       │                   │ sum does not modulo overflow.    │
       ├───────────────────┼──────────────────────────────────┤
       │clz(3clc)          │ Number of leading 0-bits in x    │
       ├───────────────────┼──────────────────────────────────┤
       │integerClamp(3clc) │ min(max( x, minval), maxval)     │
       ├───────────────────┼──────────────────────────────────┤
       │mad_hi(3clc)       │ mul_hi(a,b)+c                    │
       ├───────────────────┼──────────────────────────────────┤
       │mad24(3clc)        │ (Fast integer function.)         │
       │                   │ Multiply 24-bit integer then add │
       │                   │ the 32-bit result to 32-bit      │
       │                   │ integer                          │
       ├───────────────────┼──────────────────────────────────┤
       │mad_sat(3clc)      │ a*b+c and saturate the result    │
       ├───────────────────┼──────────────────────────────────┤
       │integerMax(3clc)   │ The greater of x or y            │
       ├───────────────────┼──────────────────────────────────┤
       │integerMax(3clc)   │ The lessor of x or y             │
       ├───────────────────┼──────────────────────────────────┤
       │mul_hi(3clc)       │ High half of the product of x    │
       │                   │ and y                            │
       ├───────────────────┼──────────────────────────────────┤
       │mul24(3clc)        │ (Fast integer function.)         │
       │                   │ Multiply 24-bit integer values a │
       │                   │ and b                            │
       ├───────────────────┼──────────────────────────────────┤
       │rotate(3clc)       │ result[indx]=v[indx]<<i[indx]    │
       ├───────────────────┼──────────────────────────────────┤
       │sub_sat(3clc)      │ x - y and saturate the result    │
       ├───────────────────┼──────────────────────────────────┤
       │upsample(3clc)     │ result[i] = ((gentype)hi[i] <<   │
       │                   │ 8|16|32) | lo[i]                 │
       ├───────────────────┼──────────────────────────────────┤
       │popcount(3clc)     │ Returns the number of non-zero   │
       │                   │ bits in x.                       │
       └───────────────────┴──────────────────────────────────┘

DESCRIPTION

       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.

SPECIFICATION

       OpenCL Specification[1]

AUTHORS

       The Khronos Group

COPYRIGHT

       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.

NOTES

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