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af8942d940
Compiler: - Add `Forward` and `Reverse` to `DifferentiabilityKind`. - Expand `DifferentiabilityMask` in `ExtInfo` to 3 bits so that it now holds all 4 cases of `DifferentiabilityKind`. - Parse `@differentiable(reverse)` and `@differentiable(_forward)` declaration attributes and type attributes. - Emit a warning for `@differentiable` without `reverse`. - Emit an error for `@differentiable(_forward)`. - Rename `@differentiable(linear)` to `@differentiable(_linear)`. - Make `@differentiable(reverse)` type lowering go through today's `@differentiable` code path. We will specialize it to reverse-mode in a follow-up patch. ABI: - Add `Forward` and `Reverse` to `FunctionMetadataDifferentiabilityKind`. - Extend `TargetFunctionTypeFlags` by 1 bit to store the highest bit of differentiability kind (linear). Note that there is a 2-bit gap in `DifferentiabilityMask` which is reserved for `AsyncMask` and `ConcurrentMask`; `AsyncMask` is ABI-stable so we cannot change that. _Differentiation module: - Replace all occurrences of `@differentiable` with `@differentiable(reverse)`. - Delete `_transpose(of:)`. Resolves rdar://69980056.
27 lines
743 B
Swift
27 lines
743 B
Swift
// RUN: %target-swift-frontend -emit-sil %s
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// TF-1315: Pullback subset thunk generation crash due to unmapped parameter
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// index for `inout` differentiability parameters.
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import _Differentiation
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func foo(_ x: Int, _ y: Float, _ z: inout Float) {}
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@derivative(of: foo, wrt: (y, z))
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func vjpFoo(_ x: Int, _ y: Float, _ z: inout Float) -> (
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value: Void, pullback: (inout Float) -> Float
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) {
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fatalError()
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}
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@differentiable(reverse)
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func TF_1315(_ x: Float) -> Float {
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var x = x
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// The call to `foo` below triggers pullback subset parameter thunk generation.
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// `foo` original function type: `(Int, Float, inout Float) -> ()`
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// Actual parameter indices: 1, 2
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// Desired parameter indices: 2
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foo(1, 2, &x)
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return x
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}
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