---
title: "simd_bitselect(_:_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_bitselect(_:_:_:)-1mn6g"
---

# simd_bitselect(_:_:_:)

Returns a vector that contains elements from either the first or second parameter, based on the corresponding element in the third parameter.

## Declaration

```swift
func simd_bitselect(_ x: simd_double4, _ y: simd_double4, _ mask: simd_long4) -> simd_double4
```

## See Also

### Logic Functions

- [simd_select(_:_:_:)](simd/simd_select(_:_:_:)-tq6k.md)