---
title: "reduce_max(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/reduce_max(_:)-66smw"
---

# reduce_max(_:)

Returns the maximum value in a vector.

## Declaration

```swift
func reduce_max(_ x: SIMD4<Double>) -> Double
```

## See Also

### Reduce Functions

- [simd_reduce_add(_:)](simd/simd_reduce_add(_:)-2ymlg.md)
- [reduce_add(_:)](simd/reduce_add(_:)-7psay.md)
- [simd_reduce_max(_:)](simd/simd_reduce_max(_:)-4qv3y.md)
- [simd_reduce_min(_:)](simd/simd_reduce_min(_:)-4umgm.md)
- [reduce_min(_:)](simd/reduce_min(_:)-4bbr.md)