# simd_long2 A vector of two 64-bit signed integer elements. ``` typealias simd_long2 = SIMD2 ``` ## Topics ### Functions to Create Two-Element Vectors From Other Vectors [`simd_make_long2(_:)`](/documentation/simd/simd_make_long2(_:)-96bn) Returns a new vector from the specified vector. [`simd_make_long2(_:)`](/documentation/simd/simd_make_long2(_:)-5ou8) Returns a new vector by truncating the specified three-element vector. [`simd_make_long2(_:)`](/documentation/simd/simd_make_long2(_:)-2abd) Returns a new vector by truncating the specified four-element vector. [`simd_make_long2(_:)`](/documentation/simd/simd_make_long2(_:)-9ozpw) Returns a new vector by truncating the specified eight-element vector. ### Conversion to Signed 64-Bit (Round Half to Even) Functions [`simd_long_rte`](/documentation/simd/simd_long_rte-80b73) Returns a new two-element vector by rounding halves to the nearest even value. ### Functions to Create Two-Element Vectors From Scalar Values [`simd_make_long2(_:)`](/documentation/simd/simd_make_long2(_:)-698vu) Returns a new vector with the first element set to a scalar value, and other elements set to zero. [`simd_make_long2(_:_:)`](/documentation/simd/simd_make_long2(_:_:)) Returns a new vector from the specified scalar values. [`vector2`](/documentation/simd/vector2-8txip) Returns a new vector from the specified scalar values. [`simd_make_long2_undef(_:)`](/documentation/simd/simd_make_long2_undef(_:)) Returns a new vector with the first element set to a scalar value, and other elements undefined. ### Functions to Create Two-Element Vectors From Vectors of Other Types [`simd_long`](/documentation/simd/simd_long-410r) Returns a new vector from the specified vector of 8-bit, signed integer elements. [`simd_long`](/documentation/simd/simd_long-4ay3) Returns a new vector from the specified vector of 8-bit, unsigned integer elements. [`simd_long`](/documentation/simd/simd_long-3w3v) Returns a new vector from the specified vector of 16-bit, signed integer elements. [`simd_long`](/documentation/simd/simd_long-462z) Returns a new vector from the specified vector of 16-bit, unsigned integer elements. [`simd_long`](/documentation/simd/simd_long-3z5r) Returns a new vector from the specified vector of 32-bit, signed integer elements. [`simd_long`](/documentation/simd/simd_long-49a7) Returns a new vector from the specified vector of 32-bit, unsigned integer elements. [`simd_long`](/documentation/simd/simd_long-3xox) Returns a new vector from the specified vector of 64-bit, signed integer elements. [`simd_long`](/documentation/simd/simd_long-47o1) Returns a new vector from the specified vector of 64-bit, unsigned integer elements. [`simd_long`](/documentation/simd/simd_long-49c1) Returns a new vector from the specified vector of 32-bit, floating-point elements. [`simd_long`](/documentation/simd/simd_long-4a75) Returns a new vector from the specified vector of 64-bit, floating-point elements. ### Functions to Perform Saturating Conversion From Vectors of Other Types [`simd_long_sat`](/documentation/simd/simd_long_sat-5sao0) Returns a new vector from the specified vector of 8-bit, signed integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5s0w0) Returns a new vector from the specified vector of 8-bit, unsigned integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5sfmo) Returns a new vector from the specified vector of 16-bit, signed integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5s5sw) Returns a new vector from the specified vector of 16-bit, unsigned integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5s900) Returns a new vector from the specified vector of 32-bit, signed integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5ryts) Returns a new vector from the specified vector of 32-bit, unsigned integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5s7z8) Returns a new vector from the specified vector of 64-bit, signed integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5ry5g) Returns a new vector from the specified vector of 64-bit, unsigned integer elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5rzv0) Returns a new vector from the specified vector of 32-bit, floating-point elements. [`simd_long_sat`](/documentation/simd/simd_long_sat-5s0fo) Returns a new vector from the specified vector of 64-bit, floating-point elements. ### Common Functions [`simd_abs(_:)`](/documentation/simd/simd_abs(_:)-88ipu) Returns the absolute value of each element in a vector. [`simd_clamp(_:_:_:)`](/documentation/simd/simd_clamp(_:_:_:)-4sik) Returns each element in a vector clamped to a specified range. [`simd_equal(_:_:)`](/documentation/simd/simd_equal(_:_:)-2qcs1) 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(_:)-49gjw) Returns the miniumum value in a vector. [`simd_reduce_max(_:)`](/documentation/simd/simd_reduce_max(_:)-4kq58) Returns the maximum value in a vector. [`simd_reduce_add(_:)`](/documentation/simd/simd_reduce_add(_:)-2qco6) Returns the sum of all elements in a vector. ### Extrema Functions [`simd_min(_:_:)`](/documentation/simd/simd_min(_:_:)-5lq3f) Returns the minimum value of each element in a vector. [`simd_max(_:_:)`](/documentation/simd/simd_max(_:_:)-439j5) Returns the maximum value of each element in a vector. ### Logic and Bitwise Functions [`simd_any(_:)`](/documentation/simd/simd_any(_:)-64pz3) [`simd_all(_:)`](/documentation/simd/simd_all(_:)-1cyyp) [`simd_bitselect(_:_:_:)`](/documentation/simd/simd_bitselect(_:_:_:)-8ffoo) Returns a vector that contains elements from either the first or second parameter, based on the corresponding element in the third parameter. ### Alternative Type Alias [`vector_long2`](/documentation/simd/vector_long2) --- 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)