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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.
18 lines
782 B
Swift
18 lines
782 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %s -emit-module -parse-as-library -o %t
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// RUN: llvm-bcanalyzer %t/differentiable_function.swiftmodule | %FileCheck %s -check-prefix=BCANALYZER
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// RUN: %target-sil-opt -enable-sil-verify-all %t/differentiable_function.swiftmodule -o - | %FileCheck %s
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// BCANALYZER-NOT: UnknownCode
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import _Differentiation
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func a(_ f: @differentiable(reverse) (Float) -> Float) {}
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// CHECK: func a(_ f: @differentiable(reverse) (Float) -> Float)
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func b(_ f: @differentiable(_linear) (Float) -> Float) {}
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// CHECK: func b(_ f: @differentiable(_linear) (Float) -> Float)
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func c(_ f: @differentiable(reverse) (Float, @noDerivative Float) -> Float) {}
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// CHECK: func c(_ f: @differentiable(reverse) (Float, @noDerivative Float) -> Float)
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