Symbol not found vDSP.dot

Question

Nikita_DDY OP

Created Aug ’22

Replies 3

Boosts 0

Views 1.1k

Participants 2

Hi there, I have following crash during application start on iOS below 15.0, even in simulator

dyld: Symbol not found: _$s10Accelerate4vDSPO3dotySfx_q_tAA0A6BufferRzAaER_Sf7ElementRtzSfAFRt_r0_lFZ

Referenced from: /Users/Nikita/Library/Developer/CoreSimulator/Devices/21071B75-CC1F-46E5-94B3-5E01072B90C6/data/Containers/Bundle/Application/73D74763-449A-4E20-B7EB-8807008B335B/vDSP test.app/vDSP test

Expected in: /usr/lib/swift/libswiftAccelerate.dylib

Sample code is very simple and looks like this:

        let vector1: [Float] = [0, 1, 2, 3, 4, 5, 6, 7]
        let vector2: [Float] = [0, 1, 2, 3, 4, 5, 6, 7]

        // Causes crash on application start
        let result = vDSP.dot(vector1, vector2)

        // Works fine
        let resultMul = vDSP.multiply(vector1, vector2)
        let result1 = vDSP.sum(resultMul)

According to docs, vDSP.dot is available since iOS 13.0.

Boost

Answer 1

Engineer OP

Apple

Aug ’22

Hi, please can you confirm your Xcode and macOS version? I'm able to run your code without problems on Monterey and Xcode 13 without issue.

0

Answer 2

Nikita_DDY OP

Aug ’22

macOS Monterey, Xcode 13.4.1

iOS simulator: iPhone XS Max 14.5
real device: iPhone XS Max 14.6

1

Answer 3

Engineer OP

Apple

Aug ’22

Apple are aware of this issue and investigating. In the meantime, the following code will work around the issue:

func dot(_ vectorA: [Float],
         _ vectorB: [Float]) -> Float {

    precondition(vectorA.count == vectorB.count)

    let n = vDSP_Length(vectorA.count)
    var result = Float.nan

    vectorA.withUnsafeBufferPointer { a in
        vectorB.withUnsafeBufferPointer { b in
            vDSP_dotpr(a.baseAddress!, 1,
                       b.baseAddress!, 1,
                       &result, n)
        }
    }
    return result
}

0