[AutoDiff upstream] Add @noDerivative flag to SILParameterInfo.
#29405
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The `@noDerivative` attribute marks the non-differentiability parameters of a `@differentiable` function type. All parameters except those marked with `@noDerivative` are differentiability parameters. For example, `@differentiable (Float, @noDerivative Float) -> Float` is only differentiable with respect to its first parameter. The `@noDerivative` attribute is represented as a `SILParameterDifferentiability` bit on `SILParameterInfo`. Add round-trip serialization tests. Resolves TF-872.
Add SILGen test.
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@swift-ci Please test |
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@jckarter: would you like to review this PR, or suggest a reviewer? I'm asking you since you seem like a SIL code owner. This PR is part of our effort to upstream differentiable programming. It lowers an existing AST flag to SIL and should be relatively non-controversial. If there's no activity, I'll merge within a day to unblock progress. Happy to address feedback at any time! |
rxwei
approved these changes
Jan 24, 2020
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Looks good to me. |
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The
@noDerivativeattribute marks the non-differentiability parameters of a@differentiablefunction type. All parameters except those marked with@noDerivativeare differentiability parameters.For example,
@differentiable (Float, @noDerivative Float) -> Floatis onlydifferentiable with respect to its first parameter.
The
@noDerivativeattribute is represented as aSILParameterDifferentiabilitybit onSILParameterInfo.The existing
@noDerivativeAST attribute is now lowered to SIL.Add round-trip serialization and SILGen tests.
Resolves TF-872.