[NFC] [AutoDiff] Gardening.

include/swift/AST/Attr.h

@@ -1537,8 +1537,8 @@ class DifferentiableAttr final
                                     ParsedAutoDiffParameter> {
   friend TrailingObjects;
 
-  /// Whether this function is linear (optional).
-  bool linear;
+  /// Whether this function is linear.
+  bool Linear;
   /// The number of parsed parameters specified in 'wrt:'.
   unsigned NumParsedParameters = 0;
   /// The JVP function.
@@ -1621,7 +1621,7 @@ class DifferentiableAttr final
     return NumParsedParameters;
   }
 
-  bool isLinear() const { return linear; }
+  bool isLinear() const { return Linear; }
 
   TrailingWhereClause *getWhereClause() const { return WhereClause; }
 
@@ -1676,8 +1676,8 @@ class DifferentiatingAttr final
   DeclNameWithLoc Original;
   /// The original function, resolved by the type checker.
   FuncDecl *OriginalFunction = nullptr;
-  /// Whether this function is linear (optional).
-  bool linear;
+  /// Whether this function is linear.
+  bool Linear;
   /// The number of parsed parameters specified in 'wrt:'.
   unsigned NumParsedParameters = 0;
   /// The differentiation parameters' indices, resolved by the type checker.
@@ -1706,7 +1706,7 @@ class DifferentiatingAttr final
 
   DeclNameWithLoc getOriginal() const { return Original; }
 
-  bool isLinear() const { return linear; }
+  bool isLinear() const { return Linear; }
 
   FuncDecl *getOriginalFunction() const { return OriginalFunction; }
   void setOriginalFunction(FuncDecl *decl) { OriginalFunction = decl; }

lib/AST/Attr.cpp

@@ -1447,7 +1447,7 @@ DifferentiableAttr::DifferentiableAttr(ASTContext &context, bool implicit,
                                        Optional<DeclNameWithLoc> vjp,
                                        TrailingWhereClause *clause)
   : DeclAttribute(DAK_Differentiable, atLoc, baseRange, implicit),
-    linear(linear), NumParsedParameters(params.size()), JVP(std::move(jvp)),
+    Linear(linear), NumParsedParameters(params.size()), JVP(std::move(jvp)),
     VJP(std::move(vjp)), WhereClause(clause) {
   std::copy(params.begin(), params.end(),
             getTrailingObjects<ParsedAutoDiffParameter>());
@@ -1461,7 +1461,7 @@ DifferentiableAttr::DifferentiableAttr(ASTContext &context, bool implicit,
                                        Optional<DeclNameWithLoc> vjp,
                                        GenericSignature *derivativeGenSig)
     : DeclAttribute(DAK_Differentiable, atLoc, baseRange, implicit),
-      linear(linear), JVP(std::move(jvp)), VJP(std::move(vjp)),
+      Linear(linear), JVP(std::move(jvp)), VJP(std::move(vjp)),
       ParameterIndices(indices) {
   setDerivativeGenericSignature(context, derivativeGenSig);
 }
@@ -1530,7 +1530,7 @@ DifferentiatingAttr::DifferentiatingAttr(
     DeclNameWithLoc original, bool linear,
     ArrayRef<ParsedAutoDiffParameter> params)
     : DeclAttribute(DAK_Differentiating, atLoc, baseRange, implicit),
-      Original(std::move(original)), linear(linear),
+      Original(std::move(original)), Linear(linear),
       NumParsedParameters(params.size()) {
   std::copy(params.begin(), params.end(),
             getTrailingObjects<ParsedAutoDiffParameter>());
@@ -1540,7 +1540,7 @@ DifferentiatingAttr::DifferentiatingAttr(
     ASTContext &context, bool implicit, SourceLoc atLoc, SourceRange baseRange,
     DeclNameWithLoc original, bool linear, IndexSubset *indices)
     : DeclAttribute(DAK_Differentiating, atLoc, baseRange, implicit),
-      Original(std::move(original)), linear(linear), ParameterIndices(indices) {
+      Original(std::move(original)), Linear(linear), ParameterIndices(indices) {
 }
 
 DifferentiatingAttr *

lib/SILGen/SILGen.cpp

@@ -770,7 +770,7 @@ void SILGenModule::postEmitFunction(SILDeclRef constant,
           paramIndices, origFnType);
       SILAutoDiffIndices indices(/*source*/ 0, loweredParamIndices);
       assert(silDiffAttr->getIndices() == indices &&
-             "Expected matching @differentiable and [differentiable]");
+             "Expected matching @differentiable and [differentiable] indices");
 
       auto lookUpConformance = LookUpConformanceInModule(M.getSwiftModule());
       auto expectedJVPType = origSilFnType->getAutoDiffDerivativeFunctionType(
@@ -875,10 +875,6 @@ void SILGenModule::emitAbstractFuncDecl(AbstractFunctionDecl *AFD) {
     if (!hasFunction(thunk))
       emitNativeToForeignThunk(thunk);
   }
-
-  // TODO: Handle SILGen for `@differentiating` attribute.
-  // Tentative solution: SILGen derivative function normally but also emit
-  // mangled redirection thunk for retroactive differentiation.
 }
 
 void SILGenModule::emitFunction(FuncDecl *fd) {

lib/SILOptimizer/Mandatory/Differentiation.cpp

@@ -353,8 +353,8 @@ struct DifferentiationInvoker {
   Kind kind;
   union Value {
     /// The instruction associated with the `DifferentiableFunctionInst` case.
-    DifferentiableFunctionInst *adFuncInst;
-    Value(DifferentiableFunctionInst *inst) : adFuncInst(inst) {}
+    DifferentiableFunctionInst *diffFuncInst;
+    Value(DifferentiableFunctionInst *inst) : diffFuncInst(inst) {}
 
     /// The parent `apply` instruction and `[differentiable]` attribute
     /// associated with the `IndirectDifferentiation` case.
@@ -385,7 +385,7 @@ struct DifferentiationInvoker {
 
   DifferentiableFunctionInst *getDifferentiableFunctionInst() const {
     assert(kind == Kind::DifferentiableFunctionInst);
-    return value.adFuncInst;
+    return value.diffFuncInst;
   }
 
   std::pair<ApplyInst *, SILDifferentiableAttr *>

stdlib/public/core/DifferentiationSupport.swift

@@ -919,7 +919,7 @@ public struct AnyDerivative : EuclideanDifferentiable & AdditiveArithmetic {
   @differentiating(+)
   @usableFromInline internal static func _jvpAdd(
     lhs: AnyDerivative, rhs: AnyDerivative
-    ) -> (value: AnyDerivative,
+  ) -> (value: AnyDerivative,
     differential: (AnyDerivative, AnyDerivative) -> (AnyDerivative)) {
       return (lhs + rhs, { (dlhs, drhs) in dlhs + drhs })
   }