# blsr_u64(ulong)

> Copy all bits from unsigned 64-bit integer a to dst, and reset (set to 0) the bit in dst that corresponds to the lowest set bit in a.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Burst.Intrinsics](/engine/6000.7/script-reference/unity/burst/intrinsics.md)
* **Assembly:** UnityEngine.BurstModule

```csharp
public static ulong blsr_u64(ulong a)
```

### Parameters

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

### Returns

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

### Remarks

\_\_\_\_ blsr r64, r64