Function

vDSP_veqvi(_:_:_:_:_:_:_:)

Calculates bitwise logical equivalence of two integer vectors.

Declaration

func vDSP_veqvi(_ __A: UnsafePointer<Int32>, _ __IA: vDSP_Stride, _ __B: UnsafePointer<Int32>, _ __IB: vDSP_Stride, _ __C: UnsafeMutablePointer<Int32>, _ __IC: vDSP_Stride, _ __N: vDSP_Length)

Parameters

__A

Integer input vector.

__IA

Stride for A.

__B

Integer input vector.

__IB

Stride for B.

__C

Integer output vector.

__IC

Stride for C.

__N

The number of elements to process.

Discussion

This function calculates the bitwise logical equivalence of the first N elements of A and B, writing the result to C:

A diagram showing the operation of the vDSP_veqvi function. There are three rows. The top row represents the first input, vector A. The second row represents the second input, vector B. The bottom row represents the output, vector C. The diagram has connecting lines from the input vectors to the output vector indicating the relationships between the inputs and output.

The operation is:

for (n = 0; n < N; ++n)
    C[n] = ~(A[n] ^ B[n]);

The following code shows an example of using vDSP_veqvi(_:_:_:_:_:_:_:):

let stride = vDSP_Stride(1)

let a: [Int32] = [0, 0, 1, 1]
let b: [Int32] = [0, 1, 0, 1]

let n = vDSP_Length(a.count)

var c = [Int32](repeating: 0,
                count: a.count)

vDSP_veqvi(b, stride,
           a, stride,
           &c, stride,
           n)

// Prints "[-1, -2, -2, -1]"
print(c)

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