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// RUN: %target-swift-frontend -emit-sil -O %s | %FileCheck %s
// REQUIRES: swift_in_compiler
import _Differentiation
@differentiable(reverse)
@_silgen_name("test_f")
// Check that (differentiable) closure apply is optimized out
// CHECK-LABEL: test_f : $@convention(thin) (@guaranteed Array<Double>) -> Double
// CHECK-NOT: differentiable_function [parameters 0] [results 0]
func f(array: [Double]) -> Double {
var array = array
array.update(at: 1,
byCalling: {
(element: inout Double) in
let initialElement = element;
element *= initialElement
}
)
return 0.0
}
public func valueWithPullback<T>(at x: T, of f: @differentiable(reverse) (inout T) -> Void) -> (value: Void, pullback: (inout T.TangentVector) -> Void) {fatalError()}
public func pullback<T>(at x: T, of f: @differentiable(reverse) (inout T) -> Void) -> (inout T.TangentVector) -> Void {return valueWithPullback(at: x, of: f).pullback}
public extension Array {
@differentiable(reverse)
mutating func update(at index: Int,
byCalling closure: @differentiable(reverse) (inout Element) -> Void) where Element: Differentiable {
closure(&self[index])
}
}
public extension Array where Element: Differentiable {
@derivative(of: update(at:byCalling:))
mutating func vjpUpdate(at index: Int, byCalling closure: @differentiable(reverse) (inout Element) -> Void) -> (value: Void, pullback: (inout Self.TangentVector) -> Void) {
let closurePullback = pullback(at: self[index], of: closure)
return (value: (), pullback: { closurePullback(&$0.base[index]) })
}
}
public struct D<I: Equatable, D> {
public subscript(_ index: I) -> D? {
get {fatalError()}
set {fatalError()}
}
}
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