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

# simd_rsqrt(_:)

Returns the reciprocal square root of each element in a vector.

## Declaration

```swift
func simd_rsqrt(_ x: simd_double8) -> simd_double8
```

## See Also

### Reciprocal and Reciprocal Square Root Functions

- [simd_recip(_:)](simd/simd_recip(_:)-98afu.md)
- [simd_fast_recip(_:)](simd/simd_fast_recip(_:)-16f97.md)
- [simd_precise_recip(_:)](simd/simd_precise_recip(_:)-74cqq.md)
- [simd_fast_rsqrt(_:)](simd/simd_fast_rsqrt(_:)-922us.md)
- [simd_precise_rsqrt(_:)](simd/simd_precise_rsqrt(_:)-1hq00.md)