# simd_char64 A vector of sixty-four 8-bit signed integer elements. ``` typealias simd_char64 = SIMD64 ``` ## Topics ### Functions to Create Sixty Four-Element Vectors From Other Vectors [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-mo7n) Returns a new vector from the specified two-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-kchm) Returns a new vector from the specified three-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-18pa1) Returns a new vector from the specified four-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-1mmet) Returns a new vector from the specified eight-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-kijk) Returns a new vector from the specified sixteen-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-747mj) Returns a new vector from the specified thirty two-element vector, and other elements set to zero. [`simd_make_char64(_:)`](/documentation/simd/simd_make_char64(_:)-v4n8) Returns a new vector from the specified vector. [`simd_make_char64(_:_:)`](/documentation/simd/simd_make_char64(_:_:)) Returns a new vector from the specified vectors. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-9r2mn) Returns a new vector from the specified two-element vector, and other elements undefined. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-9ui3q) Returns a new vector from the specified three-element vector, and other elements undefined. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-cbyu) Returns a new vector from the specified four-element vector, and other elements undefined. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-p5ey) Returns a new vector from the specified eight-element vector, and other elements undefined. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-ax60) Returns a new vector from the specified sixteen-element vector, and other elements undefined. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-5axfx) 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_char64(_:)`](/documentation/simd/simd_make_char64(_:)-bvt7) Returns a new vector with the first element set to a scalar value, and other elements set to zero. [`simd_make_char64_undef(_:)`](/documentation/simd/simd_make_char64_undef(_:)-2ljie) Returns a new vector with the first element set to a scalar value, and other elements undefined. ### Common Functions [`simd_abs(_:)`](/documentation/simd/simd_abs(_:)-1p85t) Returns the absolute value of each element in a vector. [`simd_clamp(_:_:_:)`](/documentation/simd/simd_clamp(_:_:_:)-6jkxk) Returns each element in a vector clamped to a specified range. [`simd_equal(_:_:)`](/documentation/simd/simd_equal(_:_:)-8ghe2) Returns true if every element in a vector is exactly equal to the corresponding element in a second vector, and otherwise returns false. ### Reduce Functions [`simd_reduce_min(_:)`](/documentation/simd/simd_reduce_min(_:)-jzf5) Returns the miniumum value in a vector. [`simd_reduce_max(_:)`](/documentation/simd/simd_reduce_max(_:)-mshf) Returns the maximum value in a vector. [`simd_reduce_add(_:)`](/documentation/simd/simd_reduce_add(_:)-92wpk) Returns the sum of all elements in a vector. ### Logic and Bitwise Functions [`simd_any(_:)`](/documentation/simd/simd_any(_:)-jb9j) [`simd_all(_:)`](/documentation/simd/simd_all(_:)-2mapx) [`simd_bitselect(_:_:_:)`](/documentation/simd/simd_bitselect(_:_:_:)-2qkxa) Returns a vector that contains elements from either the first or second parameter, based on the corresponding element in the third parameter. ### Extrema Functions [`simd_min(_:_:)`](/documentation/simd/simd_min(_:_:)-66xtr) Returns the minimum value of each element in a vector. [`simd_max(_:_:)`](/documentation/simd/simd_max(_:_:)-4dt8v) Returns the maximum value of each element in a vector. --- 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)