# vaddv_s8(v64)

> Add across Vector. This instruction adds every vector element in the source SIMD&FP register together, and writes the scalar result to the destination SIMD&FP register.Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped. Equivalent instruction: ADDV Bd,Vn.8B

## Definition

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

```csharp
public static sbyte vaddv_s8(v64 a0)
```

### Parameters

**** (\[v64]\(/engine/6000.7/script-reference/unity/burst/intrinsics/v64)): 64-bit vector a0

### Returns

| Type                                                         | Description |
| ------------------------------------------------------------ | ----------- |
| [sbyte](https://learn.microsoft.com/dotnet/api/system.sbyte) | SByte       |