# simd_uchar64 A vector of sixty-four 8-bit unsigned integer elements. ``` typealias simd_uchar64 = SIMD64 ``` ## Topics ### Functions to Create Sixty Four-Element Vectors From Other Vectors [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-57u64) Returns a new vector from the specified two-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-5apn9) Returns a new vector from the specified three-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-51eby) Returns a new vector from the specified four-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-65i5u) Returns a new vector from the specified eight-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-3wfeh) Returns a new vector from the specified sixteen-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-56lh8) Returns a new vector from the specified thirty two-element vector, and other elements set to zero. [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-1g5oc) Returns a new vector from the specified vector. [`simd_make_uchar64(_:_:)`](/documentation/simd/simd_make_uchar64(_:_:)) Returns a new vector from the specified vectors. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-8lvix) Returns a new vector from the specified two-element vector, and other elements undefined. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-8ig34) Returns a new vector from the specified three-element vector, and other elements undefined. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-8fhu3) Returns a new vector from the specified four-element vector, and other elements undefined. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-9jm47) Returns a new vector from the specified eight-element vector, and other elements undefined. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-p0tj) Returns a new vector from the specified sixteen-element vector, and other elements undefined. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-9ldf2) Returns a new vector from the specified thirty two-element vector, and other elements undefined. ### Functions to Create Sixty Four-Element Vectors From Scalar Values [`simd_make_uchar64(_:)`](/documentation/simd/simd_make_uchar64(_:)-9d1w7) Returns a new vector with the first element set to a scalar value, and other elements set to zero. [`simd_make_uchar64_undef(_:)`](/documentation/simd/simd_make_uchar64_undef(_:)-6vlwv) Returns a new vector with the first element set to a scalar value, and other elements undefined. ### Reduce Functions [`simd_reduce_min(_:)`](/documentation/simd/simd_reduce_min(_:)-jpn5) Returns the miniumum value in a vector. [`simd_reduce_max(_:)`](/documentation/simd/simd_reduce_max(_:)-micz) Returns the maximum value in a vector. [`simd_reduce_add(_:)`](/documentation/simd/simd_reduce_add(_:)-936l4) Returns the sum of all elements in a vector. ### Extrema Functions [`simd_min(_:_:)`](/documentation/simd/simd_min(_:_:)-ep1f) Returns the minimum value of each element in a vector. [`simd_max(_:_:)`](/documentation/simd/simd_max(_:_:)-5la8o) Returns the maximum value of each element in a vector. ### Common Functions [`simd_clamp(_:_:_:)`](/documentation/simd/simd_clamp(_:_:_:)-52h9h) Returns each element in a vector clamped to a specified range. [`simd_equal(_:_:)`](/documentation/simd/simd_equal(_:_:)-494kp) Returns true if every element in a vector is exactly equal to the corresponding element in a second vector, and otherwise returns false. ### Logic and Bitwise Functions [`simd_any(_:)`](/documentation/simd/simd_any(_:)-jl1j) [`simd_all(_:)`](/documentation/simd/simd_all(_:)-2m0jp) [`simd_bitselect(_:_:_:)`](/documentation/simd/simd_bitselect(_:_:_:)-2bway) Returns a vector that contains elements from either the first or second parameter, based on the corresponding element in the third parameter. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)