# trunc

Round to integer toward zero.

```
gentype
```**
trunc
**
(
| gentype `)` |

## Description

Round to integral value using the round to zero rounding mode.

## Notes

The built-in math functions are categorized into the following:

- A list of built-in functions that have scalar or vector argument versions, and,
- A list of built-in functions that only take scalar float arguments.

The vector versions of the math functions operate
component-wise. The description is per-component.

The built-in math functions are not affected by the prevailing rounding mode in the calling
environment, and always return the same value as they would if called with the round to
nearest even rounding mode.

The built-in math functions take scalar or vector arguments. For any specific use of these
function, the actual type has to be the same for all arguments and the return type unless
otherwise specified.

The generic type name gentype is used to indicate that the function can
take float, float2, float3, float4,
float8, float16, double, double2,
double3, double4, double8, or double16
as the type for the arguments.

If extended with cl_khr_fp16,
generic type name gentype may indicate half and
half{2|3|4|8|16} as arguments and return values.

The generic type name gentypef is used to indicate that the function can
take float, float2, float3, float4,
float8, or float16 as the type for the arguments.

The generic type name gentyped is used to indicate that the function can take
double, double2, double3, double4,
double8, or double16 as the type for the arguments.

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