[mlir][Index][NFC] Migrate index dialect to the new fold API

[zero9178]

Summary

See https://discourse.llvm.org/t/psa-new-improved-fold-method-signature-has-landed-please-update-your-downstream-projects/67618 for context

Similar to the patch for the arith dialect, the index dialects fold implementations make heavy use of generic fold functions, hence the change being comparatively mechanical and mostly changing the function signature.

[zero9178]

Rebase

mlir/include/mlir/Dialect/Index/IR/IndexDialect.td

let extraClassDeclaration = [{
     /// Register all dialect attributes.
     void registerAttributes();
     /// Register all dialect operations.
     void registerOperations();
   }];
 
   let hasConstantMaterializer = 1;
   let useDefaultAttributePrinterParser = 1;
+  let useFoldAPI = kEmitFoldAdaptorFolder;
 }
 
 #endif // INDEX_DIALECT

mlir/lib/Dialect/Index/IR/IndexOps.cpp

static OpFoldResult foldBinaryOpChecked(
   // The operation can be folded for these particular operands.
   return IntegerAttr::get(IndexType::get(lhs.getContext()), *result64);
 }
 
 //===----------------------------------------------------------------------===//
 // AddOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult AddOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult AddOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs + rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs + rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // SubOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult SubOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult SubOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs - rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs - rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // MulOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult MulOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult MulOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs * rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs * rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // DivSOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult DivSOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult DivSOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpChecked(
-      operands, [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
         // Don't fold division by zero.
         if (rhs.isZero())
           return std::nullopt;
         return lhs.sdiv(rhs);
       });
 }
 
 //===----------------------------------------------------------------------===//
 // DivUOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult DivUOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult DivUOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpChecked(
-      operands, [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
         // Don't fold division by zero.
         if (rhs.isZero())
           return std::nullopt;
         return lhs.udiv(rhs);
       });
 }
 
 //===----------------------------------------------------------------------===//
if (n.sgt(0) != mGtZ) {
     return -(-n).sdiv(m);
   }
   // Otherwise, compute the positive result. Signed division overflow is not
   // possible since if `m == -1`, `x` will be `1`.
   int64_t x = mGtZ ? -1 : 1;
   return (n + x).sdiv(m) + 1;
 }
 
-OpFoldResult CeilDivSOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, calculateCeilDivS);
+OpFoldResult CeilDivSOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(adaptor.getOperands(), calculateCeilDivS);
 }
 
 //===----------------------------------------------------------------------===//
 // CeilDivUOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult CeilDivUOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult CeilDivUOp::fold(FoldAdaptor adaptor) {
   // Compute `ceildivu(n, m)` as `n == 0 ? 0 : (n-1)/m + 1`.
   return foldBinaryOpChecked(
-      operands, [](const APInt &n, const APInt &m) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &n, const APInt &m) -> Optional<APInt> {
         // Don't fold division by zero.
         if (m.isZero())
           return std::nullopt;
         // Short-circuit the zero case.
         if (n.isZero())
           return n;
 
         return (n - 1).udiv(m) + 1;
static Optional<APInt> calculateFloorDivS(const APInt &n, const APInt &m) {
   }
   // If the operands have different signs, compute the negative result. Signed
   // division overflow is not possible since if `m == -1`, `x` will be 1 and
   // `n` can be at most `INT_MAX`.
   int64_t x = mLtZ ? 1 : -1;
   return -1 - (x - n).sdiv(m);
 }
 
-OpFoldResult FloorDivSOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, calculateFloorDivS);
+OpFoldResult FloorDivSOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(adaptor.getOperands(), calculateFloorDivS);
 }
 
 //===----------------------------------------------------------------------===//
 // RemSOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult RemSOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
-    return lhs.srem(rhs);
-  });
+OpFoldResult RemSOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs.srem(rhs); });
 }
 
 //===----------------------------------------------------------------------===//
 // RemUOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult RemUOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
-    return lhs.urem(rhs);
-  });
+OpFoldResult RemUOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs.urem(rhs); });
 }
 
 //===----------------------------------------------------------------------===//
 // MaxSOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult MaxSOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
+OpFoldResult MaxSOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(adaptor.getOperands(),
+                             [](const APInt &lhs, const APInt &rhs) {
                                return lhs.sgt(rhs) ? lhs : rhs;
                              });
 }
 
 //===----------------------------------------------------------------------===//
 // MaxUOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult MaxUOp::fold(ArrayRef<Attribute> operands) {
-  return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
+OpFoldResult MaxUOp::fold(FoldAdaptor adaptor) {
+  return foldBinaryOpChecked(adaptor.getOperands(),
+                             [](const APInt &lhs, const APInt &rhs) {
                                return lhs.ugt(rhs) ? lhs : rhs;
                              });
 }
 
 //===----------------------------------------------------------------------===//
 // MinSOp
 //===----------------------------------------------------------------------===//
 
 OpFoldResult MinSOp::fold(ArrayRef<Attribute> operands) {
   return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
return foldBinaryOpChecked(operands, [](const APInt &lhs, const APInt &rhs) {
     return lhs.ult(rhs) ? lhs : rhs;
   });
 }
 
 //===----------------------------------------------------------------------===//
 // ShlOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult ShlOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult ShlOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
         // We cannot fold if the RHS is greater than or equal to 32 because
         // this would be UB in 32-bit systems but not on 64-bit systems. RHS is
         // already treated as unsigned.
         if (rhs.uge(32))
           return {};
         return lhs << rhs;
       });
 }
 
 //===----------------------------------------------------------------------===//
 // ShrSOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult ShrSOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult ShrSOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpChecked(
-      operands, [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
         // Don't fold if RHS is greater than or equal to 32.
         if (rhs.uge(32))
           return {};
         return lhs.ashr(rhs);
       });
 }
 
 //===----------------------------------------------------------------------===//
 // ShrUOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult ShrUOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult ShrUOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpChecked(
-      operands, [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) -> Optional<APInt> {
         // Don't fold if RHS is greater than or equal to 32.
         if (rhs.uge(32))
           return {};
         return lhs.lshr(rhs);
       });
 }
 
 //===----------------------------------------------------------------------===//
 // AndOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult AndOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult AndOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs & rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs & rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // OrOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult OrOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult OrOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs | rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs | rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // XOrOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult XOrOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult XOrOp::fold(FoldAdaptor adaptor) {
   return foldBinaryOpUnchecked(
-      operands, [](const APInt &lhs, const APInt &rhs) { return lhs ^ rhs; });
+      adaptor.getOperands(),
+      [](const APInt &lhs, const APInt &rhs) { return lhs ^ rhs; });
 }
 
 //===----------------------------------------------------------------------===//
 // CastSOp
 //===----------------------------------------------------------------------===//
 
 bool CastSOp::areCastCompatible(TypeRange lhsTypes, TypeRange rhsTypes) {
   return lhsTypes.front().isa<IndexType>() != rhsTypes.front().isa<IndexType>();
bool compareIndices(const APInt &lhs, const APInt &rhs,
   case IndexCmpPredicate::ULE:
     return lhs.ule(rhs);
   case IndexCmpPredicate::ULT:
     return lhs.ult(rhs);
   }
   llvm_unreachable("unhandled IndexCmpPredicate predicate");
 }
 
-OpFoldResult CmpOp::fold(ArrayRef<Attribute> operands) {
-  assert(operands.size() == 2 && "compare expected 2 operands");
-  auto lhs = dyn_cast_if_present<IntegerAttr>(operands[0]);
-  auto rhs = dyn_cast_if_present<IntegerAttr>(operands[1]);
+OpFoldResult CmpOp::fold(FoldAdaptor adaptor) {
+  auto lhs = dyn_cast_if_present<IntegerAttr>(adaptor.getLhs());
+  auto rhs = dyn_cast_if_present<IntegerAttr>(adaptor.getRhs());
   if (!lhs || !rhs)
     return {};
 
   // Perform the comparison in 64-bit and 32-bit.
   bool result64 = compareIndices(lhs.getValue(), rhs.getValue(), getPred());
   bool result32 = compareIndices(lhs.getValue().trunc(32),
                                  rhs.getValue().trunc(32), getPred());
   if (result64 != result32)
     return {};
   return BoolAttr::get(getContext(), result64);
 }
 
 //===----------------------------------------------------------------------===//
 // ConstantOp
 //===----------------------------------------------------------------------===//
 
 void ConstantOp::getAsmResultNames(
     function_ref<void(Value, StringRef)> setNameFn) {
   SmallString<32> specialNameBuffer;
   llvm::raw_svector_ostream specialName(specialNameBuffer);
   specialName << "idx" << getValueAttr().getValue();
   setNameFn(getResult(), specialName.str());
 }
 
-OpFoldResult ConstantOp::fold(ArrayRef<Attribute> operands) {
-  return getValueAttr();
-}
+OpFoldResult ConstantOp::fold(FoldAdaptor adaptor) { return getValueAttr(); }
 
 void ConstantOp::build(OpBuilder &b, OperationState &state, int64_t value) {
   build(b, state, b.getIndexType(), b.getIndexAttr(value));
 }
 
 //===----------------------------------------------------------------------===//
 // BoolConstantOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult BoolConstantOp::fold(ArrayRef<Attribute> operands) {
+OpFoldResult BoolConstantOp::fold(FoldAdaptor adaptor) {
   return getValueAttr();
 }
 
 void BoolConstantOp::getAsmResultNames(
     function_ref<void(Value, StringRef)> setNameFn) {
   setNameFn(getResult(), getValue() ? "true" : "false");
 }
 
 //===----------------------------------------------------------------------===//
 // ODS-Generated Definitions
 //===----------------------------------------------------------------------===//
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/Index/IR/IndexOps.cpp.inc"