| // RUN: %target-swift-frontend -emit-silgen %s | %target-sil-opt | %FileCheck %s |
| |
| // Test SIL differentiability witness SIL generation. |
| |
| // Test public non-generic function. |
| // SIL differentiability witness: |
| // - Has public linkage (implicit). |
| // - Has no `where` clause. |
| |
| public func foo(_ x: Float) -> Float { x } |
| |
| @derivative(of: foo) |
| public func foo_jvp(_ x: Float) -> (value: Float, differential: (Float) -> Float) { |
| (x, { $0 }) |
| } |
| |
| @derivative(of: foo) |
| public func foo_vjp(_ x: Float) -> (value: Float, pullback: (Float) -> Float) { |
| (x, { $0 }) |
| } |
| |
| // CHECK-LABEL: // differentiability witness for foo(_:) |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3fooyS2fF : $@convention(thin) (Float) -> Float { |
| // CHECK-NEXT: jvp: @AD__$s36sil_differentiability_witness_silgen3fooyS2fF__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) |
| // CHECK-NEXT: vjp: @AD__$s36sil_differentiability_witness_silgen3fooyS2fF__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) |
| // CHECK-NEXT: } |
| |
| // Test internal non-generic function. |
| // SIL differentiability witness: |
| // - Has hidden linkage. |
| // - Has no `where` clause. |
| // - Has only VJP. |
| |
| func bar<T>(_ x: Float, _ y: T) -> Float { x } |
| |
| @usableFromInline |
| @derivative(of: bar) |
| func bar_jvp<T>(_ x: Float, _ y: T) -> (value: Float, differential: (Float) -> Float) { |
| (x, { $0 }) |
| } |
| |
| // CHECK-LABEL: // differentiability witness for bar<A>(_:_:) |
| // CHECK-NEXT: sil_differentiability_witness hidden [parameters 0] [results 0] <τ_0_0> @$s36sil_differentiability_witness_silgen3baryS2f_xtlF : $@convention(thin) <T> (Float, @in_guaranteed T) -> Float { |
| // CHECK-NEXT: jvp: @AD__$s36sil_differentiability_witness_silgen3baryS2f_xtlF__jvp_src_0_wrt_0_l : $@convention(thin) <τ_0_0> (Float, @in_guaranteed τ_0_0) -> (Float, @owned @callee_guaranteed (Float) -> Float) |
| // CHECK-NEXT: } |
| |
| // Test internal generic function. |
| // SIL differentiability witness: |
| // - Has hidden linkage. |
| // - Has `where` clause. |
| |
| func generic<T>(_ x: T, _ y: Float) -> T { x } |
| |
| @derivative(of: generic) |
| func generic_jvp<T: Differentiable>(_ x: T, _ y: Float) -> ( |
| value: T, differential: (T.TangentVector, Float) -> T.TangentVector |
| ) { |
| (x, { dx, dy in dx }) |
| } |
| |
| @derivative(of: generic) |
| func generic_vjp<T: Differentiable>(_ x: T, _ y: Float) -> ( |
| value: T, pullback: (T.TangentVector) -> (T.TangentVector, Float) |
| ) { |
| (x, { ($0, .zero) }) |
| } |
| |
| // CHECK-LABEL: // differentiability witness for generic<A>(_:_:) |
| // CHECK-NEXT: sil_differentiability_witness hidden [parameters 0 1] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @$s36sil_differentiability_witness_silgen7genericyxx_SftlF : $@convention(thin) <T> (@in_guaranteed T, Float) -> @out T { |
| // CHECK-NEXT: jvp: @AD__$s36sil_differentiability_witness_silgen7genericyxx_SftlF__jvp_src_0_wrt_0_1_s14DifferentiableRzl : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed @substituted <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0, Float) -> @out τ_0_1 for <τ_0_0.TangentVector, τ_0_0.TangentVector>) |
| // CHECK-NEXT: vjp: @AD__$s36sil_differentiability_witness_silgen7genericyxx_SftlF__vjp_src_0_wrt_0_1_s14DifferentiableRzl : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed @substituted <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0) -> (@out τ_0_1, Float) for <τ_0_0.TangentVector, τ_0_0.TangentVector>) |
| // CHECK-NEXT: } |
| |
| public struct Foo: Differentiable { |
| public var x: Float |
| |
| // CHECK-LABEL: // differentiability witness for Foo.x.getter |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3FooV1xSfvg : $@convention(method) (Foo) -> Float { |
| // CHECK-NEXT: } |
| |
| @differentiable |
| public init(_ x: Float) { |
| self.x = x |
| } |
| |
| // CHECK-LABEL: // differentiability witness for Foo.init(_:) |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3FooVyACSfcfC : $@convention(method) (Float, @thin Foo.Type) -> Foo { |
| // CHECK-NEXT: } |
| |
| @differentiable |
| public func method() -> Float { |
| x |
| } |
| |
| // CHECK-LABEL: // differentiability witness for Foo.method() |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3FooV6methodSfyF : $@convention(method) (Foo) -> Float { |
| // CHECK-NEXT: } |
| |
| @differentiable |
| public var computedProperty: Float { |
| x |
| } |
| |
| // CHECK-LABEL: // differentiability witness for Foo.computedProperty.getter |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3FooV16computedPropertySfvg : $@convention(method) (Foo) -> Float { |
| // CHECK-NEXT: } |
| |
| @differentiable |
| public subscript() -> Float { |
| x |
| } |
| |
| // CHECK-LABEL: // differentiability witness for Foo.subscript.getter |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] @$s36sil_differentiability_witness_silgen3FooVSfycig : $@convention(method) (Foo) -> Float { |
| // CHECK-NEXT: } |
| } |
| |
| // Test function that is differentiable wrt subset of its parameters: |
| // - wrt x: explicit @differentiable attribute, with no custom derivative specified |
| // - wrt y: explicit @differentiable attribute, with custom derivative specified |
| // - wrt x, y: custom deriviative specified, with no explicit @differentiable attribute |
| // Has a tuple argument to verify that indices are correctly lowered to SIL. |
| |
| @differentiable(wrt: x) |
| public func wrt_subset(_ tup: (Int, Int), _ x: Float, _ y: Float) -> Float { |
| return 0 |
| } |
| |
| @derivative(of: wrt_subset, wrt: y) |
| public func wrt_subset_jvp_wrt_y(_ tup: (Int, Int), _ x: Float, _ y: Float) -> (value: Float, differential: (Float) -> Float) { |
| return (0, { $0 }) |
| } |
| |
| @derivative(of: wrt_subset, wrt: y) |
| public func wrt_subset_vjp_wrt_y(_ tup: (Int, Int), _ x: Float, _ y: Float) -> (value: Float, pullback: (Float) -> Float) { |
| return (0, { $0 }) |
| } |
| |
| @derivative(of: wrt_subset) |
| public func wrt_subset_jvp_wrt_x_y(_ tup: (Int, Int), _ x: Float, _ y: Float) -> (value: Float, differential: (Float, Float) -> Float) { |
| return (0, { $0 + $1 }) |
| } |
| |
| @derivative(of: wrt_subset) |
| public func wrt_subset_vjp_wrt_x_y(_ tup: (Int, Int), _ x: Float, _ y: Float) -> (value: Float, pullback: (Float) -> (Float, Float)) { |
| return (0, { ($0, $0) }) |
| } |
| |
| // CHECK-LABEL: // differentiability witness for wrt_subset(_:_:_:) |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 2] [results 0] @$s36sil_differentiability_witness_silgen10wrt_subsetySfSi_Sit_S2ftF : $@convention(thin) (Int, Int, Float, Float) -> Float { |
| // CHECK-NEXT: } |
| |
| // CHECK-LABEL: // differentiability witness for wrt_subset(_:_:_:) |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 3] [results 0] @$s36sil_differentiability_witness_silgen10wrt_subsetySfSi_Sit_S2ftF : $@convention(thin) (Int, Int, Float, Float) -> Float { |
| // CHECK-NEXT: jvp: |
| // CHECK-NEXT: vjp: |
| // CHECK-NEXT: } |
| |
| // CHECK-LABEL: // differentiability witness for wrt_subset(_:_:_:) |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 2 3] [results 0] @$s36sil_differentiability_witness_silgen10wrt_subsetySfSi_Sit_S2ftF : $@convention(thin) (Int, Int, Float, Float) -> Float { |
| // CHECK-NEXT: jvp: |
| // CHECK-NEXT: vjp: |
| // CHECK-NEXT: } |
| |
| // Test original function with `@differentiable` and `@derivative` attributes. |
| |
| protocol P1: Differentiable {} |
| extension P1 { |
| @differentiable // derivative generic signature: none |
| func foo() -> Float { 1 } |
| } |
| extension P1 { |
| @derivative(of: foo) // derivative generic signature: `<P1 where Self: P1>` |
| func vjpFoo() -> (value: Float, pullback: (Float) -> (TangentVector)) { |
| fatalError() |
| } |
| } |
| |
| // CHECK-LABEL: // differentiability witness for P1.foo() |
| // CHECK-NEXT: sil_differentiability_witness hidden [parameters 0] [results 0] <τ_0_0 where τ_0_0 : P1> @$s36sil_differentiability_witness_silgen2P1PAAE3fooSfyF : $@convention(method) <Self where Self : P1> (@in_guaranteed Self) -> Float { |
| // CHECK-NEXT: vjp: @AD__$s36sil_differentiability_witness_silgen2P1PAAE3fooSfyF__vjp_src_0_wrt_0_36sil_differentiability_witness_silgen2P1Rzl : $@convention(method) <τ_0_0 where τ_0_0 : P1> (@in_guaranteed τ_0_0) -> (Float, @owned @callee_guaranteed @substituted <τ_0_0> (Float) -> @out τ_0_0 for <τ_0_0.TangentVector>) |
| // CHECK-NEXT: } |
| |
| // Test custom derivatives of functions with generic signatures and `@differentiable` attributes. |
| |
| @differentiable |
| @_silgen_name("genericWithDiffAttr") |
| public func genericWithDiffAttr<T: Differentiable>(_ x: T) -> T { fatalError() } |
| |
| @derivative(of: genericWithDiffAttr) |
| public func vjpGenericWithDiffAttr<T: Differentiable>(_ x: T) |
| -> (value: T, pullback: (T.TangentVector) -> T.TangentVector) |
| { |
| fatalError() |
| } |
| |
| // CHECK-LABEL: // differentiability witness for genericWithDiffAttr |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @genericWithDiffAttr : $@convention(thin) <T where T : Differentiable> (@in_guaranteed T) -> @out T { |
| // CHECK-NEXT: vjp |
| // CHECK-NEXT: } |
| |
| // CHECK-NOT: // differentiability witness for genericWithDiffAttr |
| |
| @differentiable(where T: Differentiable) |
| @_silgen_name("genericWithConstrainedDifferentiable") |
| public func genericWithConstrainedDifferentiable<T>(_ x: T) -> T { fatalError() } |
| |
| @derivative(of: genericWithConstrainedDifferentiable) |
| public func vjpGenericWithConstrainedDifferentiable<T: Differentiable>(_ x: T) |
| -> (value: T, pullback: (T.TangentVector) -> T.TangentVector) |
| { |
| fatalError() |
| } |
| |
| // CHECK-LABEL: // differentiability witness for genericWithConstrainedDifferentiable |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @genericWithConstrainedDifferentiable : $@convention(thin) <T> (@in_guaranteed T) -> @out T { |
| // CHECK-NEXT: vjp |
| // CHECK-NEXT: } |
| |
| // CHECK-NOT: // differentiability witness for genericWithConstrainedDifferentiable |
| |
| public extension Differentiable { |
| @differentiable |
| @_silgen_name("protocolExtensionWithDiffAttr") |
| func protocolExtensionWithDiffAttr() -> Self { self } |
| |
| @derivative(of: protocolExtensionWithDiffAttr) |
| func protocolExtensionWithDiffAttr() -> (value: Self, pullback: (TangentVector) -> TangentVector) { |
| fatalError("unimplemented") |
| } |
| } |
| |
| // CHECK-LABEL: // differentiability witness for protocolExtensionWithDiffAttr |
| // CHECK-NEXT: sil_differentiability_witness [serialized] [parameters 0] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @protocolExtensionWithDiffAttr : $@convention(method) <Self where Self : Differentiable> (@in_guaranteed Self) -> @out Self { |
| // CHECK-NEXT: vjp |
| // CHECK-NEXT: } |
| |
| // CHECK-NOT: // differentiability witness for protocolExtensionWithDiffAttr |