---
title: "simd_make_double8(_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_make_double8(_:_:)"
---

# simd_make_double8(_:_:)

Returns a new vector from the specified vectors.

## Declaration

```swift
func simd_make_double8(_ lo: simd_double4, _ hi: simd_double4) -> simd_double8
```

## See Also

### Functions to Create Eight-Element Vectors From Other Vectors

- [simd_make_double8(_:)](simd/simd_make_double8(_:)-3wn9q.md)
- [simd_make_double8(_:)](simd/simd_make_double8(_:)-40259.md)
- [simd_make_double8(_:)](simd/simd_make_double8(_:)-3br50.md)
- [simd_make_double8(_:)](simd/simd_make_double8(_:)-4i0aw.md)
- [simd_make_double8_undef(_:)](simd/simd_make_double8_undef(_:)-7g0z0.md)
- [simd_make_double8_undef(_:)](simd/simd_make_double8_undef(_:)-7d127.md)
- [simd_make_double8_undef(_:)](simd/simd_make_double8_undef(_:)-7md0u.md)