# vtst_u8(v64, v64)

> Compare bitwise Test bits nonzero (vector). This instruction reads each vector element in the first source SIMD&FP register, performs an AND with the corresponding vector element in the second source SIMD&FP register, and if the result is not zero, sets every bit of the corresponding vector element in the destination SIMD&FP register to one, otherwise sets every bit of the corresponding vector element in the destination SIMD&FP register to zero.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: CMTST Vd.8B,Vn.8B,Vm.8B

## Definition

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

```csharp
public static v64 vtst_u8(v64 a0, v64 a1)
```

### Parameters

**** (\[v64]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v64)): 64-bit vector a0**** (\[v64]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v64)): 64-bit vector a1

### Returns

| Type                                                                 | Description   |
| -------------------------------------------------------------------- | ------------- |
| [v64](/engine/6000.6/script-reference/unity/burst/intrinsics/v64.md) | 64-bit vector |