# mulx_u64(ulong, ulong, out ulong)

> Multiply unsigned 64-bit integers a and b, store the low 64-bits of the result in dst, and store the high 64-bits in hi. This does not read or write arithmetic flags.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Burst.Intrinsics](/engine/6000.6/script-reference/unity/burst/intrinsics.md)
* **Assembly:** UnityEngine.BurstModule

## mulx\_u64(ulong, ulong, ulong)

```csharp
public static ulong mulx_u64(ulong a, ulong b, out ulong hi)
```

### Parameters

**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): 64-bit integer**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): 64-bit integer**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): Stores the high 64-bits

### Returns

| Type                                                          | Description    |
| ------------------------------------------------------------- | -------------- |
| [ulong](https://learn.microsoft.com/dotnet/api/system.uint64) | 64-bit integer |

### Remarks

\_\_\_\_ mulx r64, r64, m64