func testA() { let size = 10_000 let src = [Float](repeating: 0, count: size) var one: Float = 1 measure { // 0.021sec for _ in 0..<size { var dst = [Float](repeating: 0, count: size) vDSP_vsadd(src, 1, &one, &dst, 1, vDSP_Length(size)) } } } func testB() { let size = 10_000 let src = [Float](repeating: 0, count: size) var one: Float = 1 measure { // 0.012sec for _ in 0..<size { let dst = UnsafeMutablePointer<Float>.allocate(capacity: size) defer { dst.deallocate(capacity: size) } vDSP_vsadd(src, 1, &one, dst, 1, vDSP_Length(size)) } } }
これだと倍近い差が