# cmpestro(v128, int, v128, int, int)

> Compare packed strings in a and b with lengths la and lb using the control in imm8, and returns bit 0 of the resulting bit mask.

## Definition

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

```csharp
public static int cmpestro(v128 a, int la, v128 b, int lb, int imm8)
```

### Parameters

**** (\[v128]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v128)): Vector a**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): Length a**** (\[v128]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v128)): Vector b**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): Length b**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): Control

### Returns

| Type                                                       | Description |
| ---------------------------------------------------------- | ----------- |
| [int](https://learn.microsoft.com/dotnet/api/system.int32) | Bit 0       |