Dan Zheng ac48febfd4 Add @noDerivative flag to SILParameterInfo. ...

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.

2020-01-23 15:29:14 -08:00

60 KiB

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