remove unused function checking for bitfields

Author: spall

clang/include/clang/Sema/SemaHLSL.h

@@ -215,7 +215,6 @@ class SemaHLSL : public SemaBase {
   bool diagnosePositionType(QualType T, const ParsedAttr &AL);
 
   bool CanPerformScalarCast(QualType SrcTy, QualType DestTy);
-  bool ContainsBitField(QualType BaseTy);
   bool CanPerformElementwiseCast(Expr *Src, QualType DestType);
   bool CanPerformAggregateSplatCast(Expr *Src, QualType DestType);
   ExprResult ActOnOutParamExpr(ParmVarDecl *Param, Expr *Arg);

clang/lib/Sema/SemaHLSL.cpp

@@ -3544,40 +3544,6 @@ bool SemaHLSL::CanPerformScalarCast(QualType SrcTy, QualType DestTy) {
   llvm_unreachable("Unhandled scalar cast");
 }
 
-// Detect if a type contains a bitfield. Will be removed when
-// bitfield support is added to HLSLElementwiseCast and HLSLAggregateSplatCast
-bool SemaHLSL::ContainsBitField(QualType BaseTy) {
-  llvm::SmallVector<QualType, 16> WorkList;
-  WorkList.push_back(BaseTy);
-  while (!WorkList.empty()) {
-    QualType T = WorkList.pop_back_val();
-    T = T.getCanonicalType().getUnqualifiedType();
-    // only check aggregate types
-    if (const auto *AT = dyn_cast<ConstantArrayType>(T)) {
-      WorkList.push_back(AT->getElementType());
-      continue;
-    }
-    if (const auto *RT = dyn_cast<RecordType>(T)) {
-      const RecordDecl *RD = RT->getOriginalDecl()->getDefinitionOrSelf();
-      if (RD->isUnion())
-        continue;
-
-      const CXXRecordDecl *CXXD = dyn_cast<CXXRecordDecl>(RD);
-
-      if (CXXD && CXXD->isStandardLayout())
-        RD = CXXD->getStandardLayoutBaseWithFields();
-
-      for (const auto *FD : RD->fields()) {
-        if (FD->isBitField())
-          return true;
-        WorkList.push_back(FD->getType());
-      }
-      continue;
-    }
-  }
-  return false;
-}
-
 // Can perform an HLSL Aggregate splat cast if the Dest is an aggregate and the
 // Src is a scalar or a vector of length 1
 // Or if Dest is a vector and Src is a vector of length 1