# cmpunord_sd(v128, v128)

> Compare the lower double-precision (64-bit) floating-point elements in "a" and "b" to see if either is NaN, store the result in the lower element of "dst", and copy the upper element from "a" to the upper element of "dst".

## Definition

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

```csharp
public static v128 cmpunord_sd(v128 a, v128 b)
```

### Parameters

**** (\[v128]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v128)): Vector a**** (\[v128]\(/engine/6000.6/script-reference/unity/burst/intrinsics/v128)): Vector b

### Returns

| Type                                                                   | Description |
| ---------------------------------------------------------------------- | ----------- |
| [v128](/engine/6000.6/script-reference/unity/burst/intrinsics/v128.md) | Vector      |