# vqsubd_u64(ulong, ulong)

> Unsigned saturating Subtract. This instruction subtracts the element values of the second source SIMD&FP register from the corresponding element values of the first source SIMD&FP register, places the results into a vector, and writes the vector to the destination SIMD&FP register.If overflow occurs with any of the results, those results are saturated. If saturation occurs, the cumulative saturation bit FPSR.QC is set.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: UQSUB Dd,Dn,Dm

## Definition

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

```csharp
public static ulong vqsubd_u64(ulong a0, ulong a1)
```

### Parameters

**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): UInt64 a0**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): UInt64 a1

### Returns

| Type                                                          | Description |
| ------------------------------------------------------------- | ----------- |
| [ulong](https://learn.microsoft.com/dotnet/api/system.uint64) | UInt64      |