---
title: simd_packed_double4
framework: simd
role: symbol
role_heading: Type Alias
path: simd/simd_packed_double4
---

# simd_packed_double4

A packed vector of four 64-bit floating-point elements.

## Declaration

```swift
typealias simd_packed_double4 = SIMD4<Double>
```

## Topics

### Alternative Type Alias

- [packed_double4](simd/packed_double4.md)

## See Also

### Packed vector data types

- [simd_packed_double2](simd/simd_packed_double2.md)
- [simd_packed_double8](simd/simd_packed_double8.md)