Index: flang/include/flang/Optimizer/CodeGen/CGOps.td
===================================================================
--- flang/include/flang/Optimizer/CodeGen/CGOps.td
+++ flang/include/flang/Optimizer/CodeGen/CGOps.td
@@ -20,6 +20,7 @@
 def fircg_Dialect : Dialect {
   let name = "fircg";
   let cppNamespace = "::fir::cg";
+  let useFoldAPI = kEmitFoldAdaptorFolder;
 }
 
 // Base class for FIR CG operations.
Index: flang/include/flang/Optimizer/Dialect/FIRDialect.td
===================================================================
--- flang/include/flang/Optimizer/Dialect/FIRDialect.td
+++ flang/include/flang/Optimizer/Dialect/FIRDialect.td
@@ -31,6 +31,7 @@
     // supported by some FIR operations.
     "arith::ArithDialect"
   ];
+  let useFoldAPI = kEmitFoldAdaptorFolder;
 }
 
 #endif // FORTRAN_DIALECT_FIR_DIALECT
Index: flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
===================================================================
--- flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
+++ flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
@@ -39,6 +39,7 @@
 
   let useDefaultTypePrinterParser = 1;
   let cppNamespace = "hlfir";
+  let useFoldAPI = kEmitFoldAdaptorFolder;
 }
 
 
Index: flang/lib/Optimizer/Dialect/FIROps.cpp
===================================================================
--- flang/lib/Optimizer/Dialect/FIROps.cpp
+++ flang/lib/Optimizer/Dialect/FIROps.cpp
@@ -600,7 +600,7 @@
 // BoxAddrOp
 //===----------------------------------------------------------------------===//
 
-mlir::OpFoldResult fir::BoxAddrOp::fold(llvm::ArrayRef<mlir::Attribute> opnds) {
+mlir::OpFoldResult fir::BoxAddrOp::fold(FoldAdaptor adaptor) {
   if (auto *v = getVal().getDefiningOp()) {
     if (auto box = mlir::dyn_cast<fir::EmboxOp>(v)) {
       if (!box.getSlice()) // Fold only if not sliced
@@ -616,8 +616,7 @@
 // BoxCharLenOp
 //===----------------------------------------------------------------------===//
 
-mlir::OpFoldResult
-fir::BoxCharLenOp::fold(llvm::ArrayRef<mlir::Attribute> opnds) {
+mlir::OpFoldResult fir::BoxCharLenOp::fold(FoldAdaptor adaptor) {
   if (auto v = getVal().getDefiningOp()) {
     if (auto box = mlir::dyn_cast<fir::EmboxCharOp>(v))
       return box.getLen();
@@ -885,7 +884,7 @@
                  ForwardConstantConvertPattern>(context);
 }
 
-mlir::OpFoldResult fir::ConvertOp::fold(llvm::ArrayRef<mlir::Attribute> opnds) {
+mlir::OpFoldResult fir::ConvertOp::fold(FoldAdaptor adaptor) {
   if (getValue().getType() == getType())
     return getValue();
   if (matchPattern(getValue(), mlir::m_Op<fir::ConvertOp>())) {