# Integer Built-In Functions

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 without modulo overflow rhadd (`x`+`y`+1) >> 1. The intermediate sum does not modulo overflow. clz Number of leading 0-bits in `x` mad_hi `mul_hi`(`a`,`b`)+`c` mad24 (Fast integer function.) Multiply 24-bit integer then add the 32-bit result to 32-bit integer mad_sat `a`*`b`+`c` and saturate the result max The greater of `x` or `y` min The lessor of `x` or `y` mul_hi High half of the product of `x` and `y` mul24 (Fast integer function.) Multiply 24-bit 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] << 8|16|32) | `lo`[i]

## Description

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

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