# simd_uchar4 A vector of four 8-bit unsigned integer elements. ``` typealias simd_uchar4 = SIMD4 ``` ## Topics ### Functions to Create Four-Element Vectors From Other Vectors [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-4hwy4) Returns a new vector from the specified two-element vector, and other elements set to zero. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-4lf1x) Returns a new vector from the specified three-element vector, and other elements set to zero. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-3x2fa) Returns a new vector from the specified vector. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-3i1f6) Returns a new vector by truncating the specified eight-element vector. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-174yg) Returns a new vector by truncating the specified sixteen-element vector. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-6662s) Returns a new vector by truncating the specified thirty two-element vector. [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-4d9x4) Returns a new vector by truncating the specified sixty four-element vector. [`simd_make_uchar4(_:_:)`](/documentation/simd/simd_make_uchar4(_:_:)-29ka1) Returns a new vector from the specified vectors. [`vector4`](/documentation/simd/vector4-3tea7) Returns a new vector from the specified vectors. [`simd_make_uchar4_undef(_:)`](/documentation/simd/simd_make_uchar4_undef(_:)-5we7j) Returns a new vector from the specified two-element vector, and other elements undefined. [`simd_make_uchar4_undef(_:)`](/documentation/simd/simd_make_uchar4_undef(_:)-5tfyu) Returns a new vector from the specified three-element vector, and other elements undefined. ### Functions to Create Four-Element Vectors From Scalar Values [`simd_make_uchar4(_:)`](/documentation/simd/simd_make_uchar4(_:)-7gszj) Returns a new vector with the first element set to a scalar value, and other elements set to zero. [`simd_make_uchar4(_:_:_:_:)`](/documentation/simd/simd_make_uchar4(_:_:_:_:)) Returns a new vector from the specified scalar values. [`vector4`](/documentation/simd/vector4-7c8o4) Returns a new vector from the specified scalar values. [`simd_make_uchar4_undef(_:)`](/documentation/simd/simd_make_uchar4_undef(_:)-7uno) Returns a new vector with the first element set to a scalar value, and other elements undefined. ### Functions to Create Four-Element Vectors From Combinations of Vectors and Scalar Values [`simd_make_uchar4(_:_:_:)`](/documentation/simd/simd_make_uchar4(_:_:_:)-5x9io) Returns a new vector from a vector and scalar values. [`simd_make_uchar4(_:_:)`](/documentation/simd/simd_make_uchar4(_:_:)-3zlj2) Returns a new vector from a vector and a scalar value. [`vector4`](/documentation/simd/vector4-8y2oj) Returns a new vector from a vector and a scalar value. [`simd_make_uchar4(_:_:_:)`](/documentation/simd/simd_make_uchar4(_:_:_:)-9rqjk) Returns a new vector from two scalar values and a vector. [`simd_make_uchar4(_:_:_:)`](/documentation/simd/simd_make_uchar4(_:_:_:)-53d7w) Returns a new vector from a scalar value, a vector, and a scalar value. [`simd_make_uchar4(_:_:)`](/documentation/simd/simd_make_uchar4(_:_:)-4sdi7) Returns a new vector from a scalar value and a vector. ### Functions to Create Four-Element Vectors From Vectors of Other Types [`simd_uchar`](/documentation/simd/simd_uchar-8g94o) Returns a new vector from the specified vector of 8-bit, signed integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8fzaw) Returns a new vector from the specified vector of 8-bit, unsigned integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8geew) Returns a new vector from the specified vector of 16-bit, signed integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8g46w) Returns a new vector from the specified vector of 16-bit, unsigned integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8g7eg) Returns a new vector from the specified vector of 32-bit, signed integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8fxko) Returns a new vector from the specified vector of 32-bit, unsigned integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8g90k) Returns a new vector from the specified vector of 64-bit, signed integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8fz6s) Returns a new vector from the specified vector of 64-bit, unsigned integer elements. [`simd_uchar`](/documentation/simd/simd_uchar-8g0ws) Returns a new vector from the specified vector of 32-bit, floating-point elements. [`simd_uchar`](/documentation/simd/simd_uchar-8g1h0) 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_uchar_sat`](/documentation/simd/simd_uchar_sat-2dfgm) Returns a new vector from the specified vector of 8-bit, signed integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2d5ae) Returns a new vector from the specified vector of 8-bit, unsigned integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2dkfa) Returns a new vector from the specified vector of 16-bit, signed integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2daau) Returns a new vector from the specified vector of 16-bit, unsigned integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2ddea) Returns a new vector from the specified vector of 32-bit, signed integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2d3ma) Returns a new vector from the specified vector of 32-bit, unsigned integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2deje) Returns a new vector from the specified vector of 64-bit, signed integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2d4d6) Returns a new vector from the specified vector of 64-bit, unsigned integer elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2d6fq) Returns a new vector from the specified vector of 32-bit, floating point elements. [`simd_uchar_sat`](/documentation/simd/simd_uchar_sat-2d6wq) Returns a new vector from the specified vector of 64-bit, floating point elements. ### Common Functions [`simd_clamp(_:_:_:)`](/documentation/simd/simd_clamp(_:_:_:)-7gs2x) Returns each element in a vector clamped to a specified range. [`simd_equal(_:_:)`](/documentation/simd/simd_equal(_:_:)-4wf8b) 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(_:)-4uo6i) Returns the miniumum value in a vector. [`simd_reduce_max(_:)`](/documentation/simd/simd_reduce_max(_:)-4qv6y) Returns the maximum value in a vector. [`simd_reduce_add(_:)`](/documentation/simd/simd_reduce_add(_:)-2yos8) Returns the sum of all elements in a vector. ### Extrema Functions [`simd_min(_:_:)`](/documentation/simd/simd_min(_:_:)-9muwy) Returns the minimum value of each element in a vector. [`simd_max(_:_:)`](/documentation/simd/simd_max(_:_:)-2f249) Returns the maximum value of each element in a vector. ### Logic and Bitwise Functions [`simd_any(_:)`](/documentation/simd/simd_any(_:)-6d22b) [`simd_all(_:)`](/documentation/simd/simd_all(_:)-1jo4t) [`simd_bitselect(_:_:_:)`](/documentation/simd/simd_bitselect(_:_:_:)-46k0t) 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_uchar4`](/documentation/simd/vector_uchar4) --- Copyright © 2026 Apple Inc. 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