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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.
12 lines
441 B
Swift
12 lines
441 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -emit-module %S/Inputs/exports_differentiation.swift -o %t/exports_differentiation.swiftmodule
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// RUN: %target-build-swift %s -I %t
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// Test whether importing a module with `@_exported import _Differentiation`
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// enables differentiable programming. This behavior is desirable.
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import exports_differentiation
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@differentiable(reverse)
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func id<T: Differentiable>(_ x: T) -> T { x }
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