Click an item in the table below for details about that function.
abs  x  
abs_diff  x y  without modulo overflow 
add_sat  x +y and saturate result 
hadd  (x +y ) >> 1.
The intermediate sum does not modulo overflow 
rhadd  (x +y +1) >> 1.
The intermediate sum does not modulo overflow. 
clamp 
min (max (
x , minval ), maxval )

clz  Number of leading 0bits in x 
ctz  Number of trailing 0bits in x 
mad_hi  mul_hi (a ,b )+c 
mad24  (Fast integer function.) Multiply 24bit integer then add the 32bit result to 32bit integer 
mad_sat  a *b +c
and saturate the result 
max  The greater of x or y 
min  The lesser of x or y 
mul_hi  High half of the product of x and y 
mul24  (Fast integer function.) Multiply 24bit integer values
a and b 
rotate  result[indx ]=v [indx ]<<
i [indx ] 
sub_sat  x  y and saturate the result 
upsample  result [i] = ((gentype)hi [i] << 81632) 
lo [i] 
popcount  Returns the number of nonzero bits in x . 
Builtin integer functions take scalar or vector arguments. The vector versions of the integer functions operate componentwise. The description is per component.
We use the generic type name gentype to indicate that the function can take char, char{234816}, uchar, uchar{234816}, short, short{234816}, ushort, ushort{234816}, int, int{234816}, uint, uint{234816}, long, long{234816}, ulong, or ulong{234816} 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 builtin 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{234816}. 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.