[mlir][Linalg] NFC - Extract a standalone LinalgInterfaces

[nicolasvasilache]

Summary

This separation improves the layering and paves the way for more interfaces coming up in the future.

[bkramer]

looks good

[nicolasvasilache]

Fix cmake.

[nicolasvasilache]

Fix cmake take 2.

[nicolasvasilache]

More cmake pain.

[nicolasvasilache]

clang-tidy

[mehdi_amini]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

Shouldn't this file be under include/mlir/Dialect/Linalg/... ?

[nicolasvasilache]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

Hmm I went through some effort moving it under mlir/Interfaces because virtually all interfaces live there (or in IR but not applicable here).
The precedent I went after is VectorInterfaces.

Is there a strong opinion that this should not live here?

[rriddle]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

+1 to what Medhi says. Dialect specific interfaces should live near those dialects, this directory is intended for more general things. Affine already sets a precedent here (and a good one): https://github.com/llvm/llvm-project/blob/main/mlir/include/mlir/Dialect/Affine/IR/AffineMemoryOpInterfaces.td

[mehdi_amini]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

Something that isn't clear to me conceptually is why does it make sense to have an interface that is specific to a Dialect?

In general we introduce interfaces to decouple between what the client (a pass/analysis) wants to know and the "object" it operates on. The interface makes sense so that multiple dialects or operation can answer the query.

Is it intended that this interface would be implemented by other dialects? If so it can makes sense to have it here then.

[rriddle]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

In general we introduce interfaces to decouple between what the client (a pass/analysis) wants to know and the "object" it >operates on. The interface makes sense so that multiple dialects or operation can answer the query.

I don't see how this is different for a single dialect? If my dialect has a bunch of operations that have similar characteristics, why wouldn't I use an interface to make my transformations simpler? Saying that interfaces only make sense inter-dialect brings us back to hardcoding operation names in transformations, which may make sense for some things but it doesn't really scale (whether that be with one dialect or multiple).

[mehdi_amini]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

I don't see how this is different for a single dialect? If my dialect has a bunch of operations that have similar characteristics, why wouldn't I use an interface to make my transformations simpler? Saying that interfaces only make sense inter-dialect brings us back to hardcoding operation names in transformations, which may make sense for some things but it doesn't really scale (whether that be with one dialect or multiple).

I wrote multiple dialects OR operation, what I had in mind was:

-> Operation Interface: when you have multiple operations (possibly in the same dialect)
-> Dialect Interface: when you have multiple Dialects.

[mehdi_amini]

mlir/include/mlir/Interfaces/LinalgInterfaces.h

45

But I think we're on the same line that if an Operation Interface is intended for the operations in a specific dialect, then it can live within this dialect and not here :)

[nicolasvasilache]

ok, sgtm, thanks!

[nicolasvasilache]

Address review.

[nicolasvasilache]

Rebase.

[nicolasvasilache]

clang-tidy.

mlir/include/mlir/Dialect/Linalg/IR/CMakeLists.txt

 add_dependencies(LinalgOpsDocGen LinalgOdsGen)
 
 set(LLVM_TARGET_DEFINITIONS LinalgStructuredOps.td)
 mlir_tablegen(LinalgStructuredOps.h.inc -gen-op-decls)
 mlir_tablegen(LinalgStructuredOps.cpp.inc -gen-op-defs)
 add_public_tablegen_target(MLIRLinalgStructuredOpsIncGen)
 add_dependencies(MLIRLinalgStructuredOpsIncGen LinalgOdsGen)
 add_dependencies(mlir-headers MLIRLinalgStructuredOpsIncGen)
-
-set(LLVM_TARGET_DEFINITIONS LinalgStructuredOpsInterface.td)
-mlir_tablegen(LinalgStructuredOpsInterfaces.h.inc -gen-op-interface-decls)
-mlir_tablegen(LinalgStructuredOpsInterfaces.cpp.inc -gen-op-interface-defs)
-add_public_tablegen_target(MLIRLinalgStructuredOpsInterfaceIncGen)
-add_dependencies(mlir-headers MLIRLinalgStructuredOpsInterfaceIncGen)

mlir/include/mlir/Dialect/Linalg/IR/LinalgOps.h

 class PoolingMinOp;
 class PoolingSumOp;
 
 // TOFO: allow an extra ValueRange to specify an indexing and allow
 // non-hyperrectangular shapes.
 using LoopRangeBuilder =
     std::function<SmallVector<Range, 4>(OpBuilder &, Location)>;
 
-/// Returns the values obtained by applying `map` to the list of values.
-SmallVector<Value, 4> applyMapToValues(OpBuilder &b, Location loc,
-                                       AffineMap map, ValueRange values);
-
 /// Provide a very simple inference procedure to build the loop ranges from the
 /// op and its operands. This only works with permutation affine maps and
 /// patterns of the form `(m, n)[s] -> (m + n - s floordiv 2)`.
 /// A more advanced Tensor-Comprehension like inference is possible but has
 /// proven to be ambiguous in unfavorable case.
 /// As a consequence, we relax the default behavior very conservatively and
 /// provide an op-specified hook so that Linalg ops may override the behavior.
 LoopRangeBuilder defaultLoopRangesBuilder(LinalgOp op);

 } // namespace linalg
 } // namespace mlir
 
 namespace mlir {
 namespace linalg {
 class IndexedGenericOp;
 } // namespace linalg
 } // namespace mlir
-#include "mlir/Dialect/Linalg/IR/LinalgStructuredOpsInterfaces.h.inc"
+#include "mlir/Interfaces/LinalgInterfaces.h"
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/Linalg/IR/LinalgOps.h.inc"
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/Linalg/IR/LinalgStructuredOps.h.inc"
 
 #endif // MLIR_DIALECT_LINALG_LINALGOPS_H_

mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td

 // that correspond to underlying library calls (e.g. BLAS).
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LINALG_STRUCTURED_OPS
 #define LINALG_STRUCTURED_OPS
 
 include "mlir/Dialect/Linalg/IR/LinalgBase.td"
-include "mlir/Dialect/Linalg/IR/LinalgStructuredOpsInterface.td"
 include "mlir/Interfaces/CopyOpInterface.td"
+include "mlir/Interfaces//LinalgInterfaces.td"
 include "mlir/Interfaces/SideEffectInterfaces.td"
 
 // Base Tablegen class for Linalg ops.
 // Linalg ops that correspond to library calls operate on ShapedType as their
 // first operands. These may be optionally followed by non-view operands
 // depending on the specific Linalg op.
 class LinalgStructuredBase_Op<string mnemonic, list<OpTrait> props>
   : Op<Linalg_Dialect, mnemonic, !listconcat(props, [
-       LinalgStructuredInterface])> {}
+       LinalgStructuredInterface])> {
+  code structuredOpsBaseDecls = [{
+    // Return the number of induction variables in the basic block. This should
+    // always be 0 for index-free linalg ops. For IndexedGeneric, this must be
+    // equal to numLoops.
+    unsigned getNumPayloadInductionVariables() {
+      return isa<IndexedGenericOp>(this->getOperation()) ? getNumLoops() : 0;
+    }
+  }];
+}
 
 class LinalgStructured_Op<string mnemonic, list<OpTrait> props>
   : LinalgStructuredBase_Op<mnemonic,
        !listconcat(props, [
          DeclareOpInterfaceMethods<MemoryEffectsOpInterface>])> {
-  code libraryCallName = [{
+  code structuredOpsDecls = structuredOpsBaseDecls # [{
     std::string getLibraryCallName() {
       return generateLibraryCallName(getOperation());
     }
   }];
   let assemblyFormat = "`(` operands `)` attr-dict `:` type(operands)";
 }
 
 //===----------------------------------------------------------------------===//
def CopyOp : LinalgStructured_Op<"copy", [CopyOpInterface]> {
   // TODO: this should go away once the usage of OptionalAttr triggers emission
   // of builders with default arguments left unspecified.
   let builders = [OpBuilderDAG<(ins "Value":$input, "Value":$output),
     [{
       return build(
         $_builder, $_state, input, output, AffineMapAttr(), AffineMapAttr());
     }]>];
 
-  let extraClassDeclaration = libraryCallName # [{
+  let extraClassDeclaration = structuredOpsDecls # [{
     ValueRange inputs() { return getOperands().take_front(); }
     ValueRange outputs() { return getOperands().take_back(); }
 
     // Rank-polymorphic.
     //   filling_value -> O(ivs) with parallel iterators.
     ArrayAttr iterator_types() {
       unsigned nPar = getInputShapedType(0).getRank();
       return Builder(getContext()).getStrArrayAttr(
def CopyOp : LinalgStructured_Op<"copy", [CopyOpInterface]> {
   let hasFolder = 1;
   let hasCanonicalizer = 1;
 }
 
 def FillOp : LinalgStructured_Op<"fill", []> {
   let arguments = (ins AnyShaped:$output,
                    AnyTypeOf<[AnyFloat, AnySignlessInteger, AnyVector]>:$value);
   let results = (outs Optional<AnyRankedTensor>:$result);
-  let extraClassDeclaration = libraryCallName # [{
+  let extraClassDeclaration = structuredOpsDecls # [{
     ValueRange inputs() { return {}; }
     ValueRange outputs() { return getOperands().take_front(); }
 
     // Rank-polymorphic.
     //   filling_value -> O(ivs) with parallel iterators.
     ArrayAttr iterator_types() {
       unsigned nPar = getOutputShapedType(0).getRank();
       return Builder(getContext()).getStrArrayAttr(
The required optional arguments are:
       - padding: an i64 array of pairs (low, high) specifying the number of
         elements to pad along a dimension.
 
     If strides or dilations attributes are missing then the default value is
     one for each of the input dimensions. Similarly, padding values are zero
     for both low and high in each of the dimensions, if not specified.
   }];
 
-  code commonUtils = libraryCallName # [{
+  code commonUtils = structuredOpsDecls # [{
     int64_t getStride(unsigned i) {
       assert(i < getNumWindowLoops());
       if (!strides().hasValue()) return 1;
       return strides()->getValue()[i]
         .cast<IntegerAttr>().getValue().getSExtValue();
     }
 
     int64_t getDilation(unsigned i) {
let arguments = (ins Variadic<AnyShaped>:$inputs,
                        AffineMapArrayAttr:$indexing_maps,
                        ArrayAttr:$iterator_types,
                        OptionalAttr<StrAttr>:$doc,
                        OptionalAttr<StrAttr>:$library_call,
                        // ArrayAttr of StrArrayAttr:
                        OptionalAttr<ArrayAttr>:$sparse);
   let results = (outs Variadic<AnyRankedTensor>:$result_tensors);
   let regions = (region AnyRegion:$region);
-  let extraClassDeclaration = [{
+  let extraClassDeclaration = structuredOpsBaseDecls # [{
     SmallVector<StringRef, 8> linalgTraitAttrNames() {
       return SmallVector<StringRef, 8>{
         getDocAttrName(),
         getIndexingMapsAttrName(), getLibraryCallAttrName(),
         getIteratorTypesAttrName(),
       };
     }
     std::string getLibraryCallName() {

mlir/include/mlir/Interfaces/CMakeLists.txt

 add_mlir_interface(CallInterfaces)
 add_mlir_interface(CastInterfaces)
 add_mlir_interface(ControlFlowInterfaces)
 add_mlir_interface(CopyOpInterface)
 add_mlir_interface(DerivedAttributeOpInterface)
 add_mlir_interface(InferTypeOpInterface)
+add_mlir_interface(LinalgInterfaces)
 add_mlir_interface(LoopLikeInterface)
 add_mlir_interface(SideEffectInterfaces)
 add_mlir_interface(VectorInterfaces)
 add_mlir_interface(ViewLikeInterface)
 

mlir/include/mlir/Interfaces/LinalgInterfaces.h

+//===- LinalgInterface.h - Linalg operations interfaces -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the operation interfaces for Linalg operations.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_INTERFACES_LINALGINTERFACE_H_
+#define MLIR_INTERFACES_LINALGINTERFACE_H_
+
+#include "mlir/Dialect/Utils/StructuredOpsUtils.h"
+#include "mlir/IR/AffineMap.h"
+#include "mlir/IR/BlockAndValueMapping.h"
+#include "mlir/IR/BuiltinTypes.h"
+#include "mlir/IR/OpDefinition.h"
+#include "mlir/Interfaces/ViewLikeInterface.h"
+
+namespace mlir {
+namespace linalg {
+
+/// Returns the values obtained by applying `map` to the list of values.
+SmallVector<Value, 4> applyMapToValues(OpBuilder &b, Location loc,
+                                       AffineMap map, ValueRange values);
+
+namespace detail {
+
+/// Verify that `op` conforms to the invariants of StructuredOpInterface
+LogicalResult verifyStructuredOpInterface(Operation *op);
+
+} // namespace detail
+} // namespace linalg
+} // namespace mlir
+
+#include "mlir/Dialect/Linalg/IR/LinalgStructuredOps.h.inc"
+
+/// Include the generated interface declarations.
+#include "mlir/Interfaces/LinalgInterfaces.h.inc"
+
+#endif // MLIR_INTERFACES_LINALGINTERFACE_H_

mlir/include/mlir/Interfaces/LinalgInterfaces.td

 //===- LinalgStructuredInterface.td- Linalg StructuredIfce -*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This is the definition file for the structured interface for Linalg ops.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LINALG_IR_STRUCTURED_OPS_INTERFACE
 #define LINALG_IR_STRUCTURED_OPS_INTERFACE
 
-include "mlir/Dialect/Linalg/IR/LinalgBase.td"
+include "mlir/IR/OpBase.td"
 
 // The linalg 'LinalgStructuredInterface' provides access to the 'LinalgOp'
 // interface.
 def LinalgStructuredInterface : OpInterface<"LinalgOp"> {
   let cppNamespace = "::mlir::linalg";
   let methods = [
     //===------------------------------------------------------------------===//
     // Loop types handling.
     //===------------------------------------------------------------------===//
     InterfaceMethod<
       /*desc=*/[{
         Return the number of induction variables in the basic block. This should
         always be 0 for index-free linalg ops. For IndexedGeneric, this must be
         equal to numLoops
       }],
       /*retTy=*/"unsigned",
       /*methodName=*/"getNumPayloadInductionVariables",
       /*args=*/(ins),
       /*methodBody=*/"",
-      /*defaultImplementation=*/[{
-        return isa<IndexedGenericOp>(this->getOperation()) ?
-          $_op.getNumLoops() : 0;
-      }]
+      /*defaultImplementation=*/""
     >,
     //===------------------------------------------------------------------===//
     // Loop types handling.
     //===------------------------------------------------------------------===//
     InterfaceMethod<
       /*desc=*/[{
         Return the number of parallel loops.
       }],
InterfaceMethod<
         uninitialized, as well as properly cloning "read-write" operands.
       }],
       /*retTy=*/"bool",
       /*methodName=*/"payloadUsesValueFromOpOperand",
       /*args=*/(ins "OpOperand *":$opOperand),
       /*methodBody=*/"",
       /*defaultImplementation=*/[{
         unsigned bbArgNumber =
-          getNumPayloadInductionVariables() + opOperand->getOperandNumber();
+          $_op.getNumPayloadInductionVariables() + opOperand->getOperandNumber();
         // Safeguard against the named linalg ops that are manually defined and
         // that only support buffer semantics: we should not be there.
         // Such ops have an empty regionBuilder and are not constructed with a
         // region for now. In the future they are slated to disappear.
         assert(this->getOperation()->getNumRegions() == 1 && "unexpected "
                "missing region (calling `payloadUsesValueFromOpOperand` on "
                "manually defined named Linalg op?)");
         Block &block = this->getOperation()->getRegion(0).front();

mlir/lib/Dialect/Linalg/IR/CMakeLists.txt

 add_mlir_dialect_library(MLIRLinalg
   LinalgOps.cpp
   LinalgTypes.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Dialect/Linalg
 
   DEPENDS
   MLIRLinalgOpsIncGen
   MLIRLinalgStructuredOpsIncGen
-  MLIRLinalgStructuredOpsInterfaceIncGen
+  MLIRLinalgInterfacesIncGen
 
   LINK_LIBS PUBLIC
   MLIRAffine
   MLIRIR
   MLIRSideEffectInterfaces
   MLIRViewLikeInterface
   MLIRStandard
   MLIRTensor
   )

mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp

 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace mlir;
 using namespace mlir::linalg;
 
-/// Fully compose map with operands and canonicalize the result.
-/// Return the `createOrFold`'ed AffineApply op.
-static Value createFoldedComposedAffineApply(OpBuilder &b, Location loc,
-                                             AffineMap map,
-                                             ValueRange operandsRef) {
-  SmallVector<Value, 4> operands(operandsRef.begin(), operandsRef.end());
-  fullyComposeAffineMapAndOperands(&map, &operands);
-  canonicalizeMapAndOperands(&map, &operands);
-  return b.createOrFold<AffineApplyOp>(loc, map, operands);
-}
-
-SmallVector<Value, 4> mlir::linalg::applyMapToValues(OpBuilder &b, Location loc,
-                                                     AffineMap map,
-                                                     ValueRange values) {
-  SmallVector<Value, 4> res;
-  res.reserve(map.getNumResults());
-  unsigned numDims = map.getNumDims(), numSym = map.getNumSymbols();
-  // For each `expr` in `map`, applies the `expr` to the values extracted from
-  // ranges. If the resulting application can be folded into a Value, the
-  // folding occurs eagerly.
-  for (auto expr : map.getResults()) {
-    AffineMap map = AffineMap::get(numDims, numSym, expr);
-    res.push_back(createFoldedComposedAffineApply(b, loc, map, values));
-  }
-  return res;
-}
-
-SmallVector<Value, 4> LinalgOp::createFlatListOfOperandDims(OpBuilder &b,
-                                                            Location loc) {
-  SmallVector<Value, 4> res;
-  for (Value v : getShapedOperands()) {
-    ShapedType t = v.getType().template cast<ShapedType>();
-    for (unsigned i = 0, e = t.getRank(); i < e; ++i)
-      res.push_back(b.create<DimOp>(loc, v, i));
-  }
-  return res;
-}
-
-SmallVector<Range, 4> LinalgOp::createLoopRanges(OpBuilder &b, Location loc) {
-  AffineMap map = getLoopsToShapesMap();
-  unsigned numDims = map.getNumDims(), numRes = map.getNumResults();
-  auto viewSizes = createFlatListOfOperandDims(b, loc);
-  SmallVector<Range, 4> res(numDims);
-  Value zeroVal = b.create<ConstantIndexOp>(loc, 0);
-  Value oneVal = b.create<ConstantIndexOp>(loc, 1);
-  for (unsigned idx = 0; idx < numRes; ++idx) {
-    auto result = map.getResult(idx);
-    if (auto d = result.dyn_cast<AffineDimExpr>()) {
-      if (res[d.getPosition()].offset)
-        continue;
-      res[d.getPosition()] = Range{zeroVal, viewSizes[idx], oneVal};
-    }
-  }
-  return res;
-}
-
-/// Visitor to check if any of the given set of positions from AffineDimExprs
-/// are used within an AffineExpr.
-struct HasAffineDimExprVisitor
-    : public AffineExprVisitor<HasAffineDimExprVisitor, bool> {
-  HasAffineDimExprVisitor(llvm::SmallSet<unsigned, 4> &positions)
-      : positions(positions) {}
-
-  bool visitAffineBinaryOpExpr(AffineBinaryOpExpr binaryOpExpr) {
-    return visit(binaryOpExpr.getLHS()) || visit(binaryOpExpr.getRHS());
-  }
-
-  bool visitDimExpr(AffineDimExpr dimExpr) {
-    return positions.count(dimExpr.getPosition());
-  }
-
-  bool visitConstantExpr(AffineConstantExpr constExpr) { return false; }
-
-  bool visitSymbolExpr(AffineSymbolExpr symbolExpr) { return false; }
-
-private:
-  llvm::SmallSet<unsigned, 4> positions;
-};
-
-Optional<Value> LinalgOp::inferResultDimFromInputShapes(OpBuilder &b,
-                                                        Location loc,
-                                                        unsigned resultIdx,
-                                                        unsigned dim) {
-  // An example that helps understand the logic below.
-  // Consider the following expression O(i+j, j) += A(i,k) * B(k, j)
-  // We want to express the shape of dim 0 of O in terms of shape of the inputs.
-  // This is achieved as follows.
-  //   loopsToShapesMap = (d0, d1, d2) -> (d0, d2, d2, d1, d0 + d1, d1)
-  //   subMapOfResultDim = (d0, d1, d2) -> (d0 + d1)
-  //   shapesToLoopsMap = (d0, d2, d2, d3, d4, d5) -> (d0, d3, d2)
-  //   resultFromFromInputDim = subMapOfResultDim.compose(shapesToLoopMap)
-  //     = (d0, d1, d2, d3, d4, d5) -> (d0 + d1)
-  AffineMap loopsToShapesMap = getLoopsToShapesMap();
-
-  // Find the position in the above map that represents the shape of the
-  // result:dim being inferred.
-  Optional<unsigned> resultDimSubMapPos =
-      getResultValueDimPositionInLoopsToShapeMap(resultIdx, dim);
-  if (!resultDimSubMapPos)
-    return {};
-
-  /// From loopsToShapesMap extract the submap that represents the shape of the
-  /// (resultIdx, dim) needed
-  AffineMap loopToResultDimShapeMap =
-      loopsToShapesMap.getSubMap(*resultDimSubMapPos);
-  AffineMap operandShapesToResultDimMap =
-      loopToResultDimShapeMap.compose(getShapesToLoopsMap());
-
-  // Check that the result dim map does not contain the positions corresponding
-  // to the outputs.
-  llvm::SmallSet<unsigned, 4> outputDims;
-  unsigned outputDimPosStart =
-      getResultValueDimPositionInLoopsToShapeMap(0, 0).getValue();
-  unsigned outputDimPosEnd =
-      getResultValueDimPositionInLoopsToShapeMap(getNumOutputs() - 1,
-                                                 getOutputOpOperands()
-                                                         .back()
-                                                         .get()
-                                                         .getType()
-                                                         .cast<ShapedType>()
-                                                         .getRank() -
-                                                     1)
-          .getValue();
-  llvm::for_each(llvm::seq<unsigned>(outputDimPosStart, outputDimPosEnd),
-                 [&outputDims](unsigned dim) { outputDims.insert(dim); });
-  HasAffineDimExprVisitor checkDimExpr(outputDims);
-  if (checkDimExpr.visit(operandShapesToResultDimMap.getResult(0)))
-    return llvm::None;
-  return applyMapToValues(b, loc, operandShapesToResultDimMap,
-                          createFlatListOfOperandDims(b, loc))[0];
-}
-
 /// Forward declarations.
 template <typename NamedStructuredOpType>
 static void buildNamedStructuredOpRegionAndAttributes(OpBuilder &opBuilder,
                                                       OperationState &result,
                                                       TypeRange inputTypes,
                                                       TypeRange outputTypes);
 
 static ParseResult
for (OpOperand &operand : op->getOpOperands()) {
     if (castOp && canFoldIntoConsumerOp(castOp)) {
       operand.set(castOp.getOperand());
       folded = true;
     }
   }
   return success(folded);
 }
 
-///////////////////// Operations defined with Tablegen /////////////////////////
-// For such operations that do not correspond to library calls (i.e. defined in
-// LinalgOps.td), we define an overloaded `print` function and a
-// parse`className` function.
-
 //===----------------------------------------------------------------------===//
 // FillOp
 //===----------------------------------------------------------------------===//
 
 void FillOp::build(OpBuilder &builder, OperationState &result, Value output,
                    Value value) {
   build(builder, result, output.getType().dyn_cast<RankedTensorType>(), output,
         value);

 
 void IndexedGenericOp::getEffects(
     SmallVectorImpl<SideEffects::EffectInstance<MemoryEffects::Effect>>
         &effects) {
   getGenericEffectsImpl(effects, getOperation()->getResults(),
                         getInputBuffers(), getOutputBuffers());
 }
 
-LogicalResult mlir::linalg::detail::verifyStructuredOpInterface(Operation *op) {
-  LinalgOp linalgOp = cast<LinalgOp>(op);
-  // Expect at least one shaped operand.
-  // This means an op that constructs a tensor out of indices cannot be a
-  // LinalgOp at the moment. For now this will have to be a special op until we
-  // have output shape operands that are not tensors.
-  auto nShapedOperands = linalgOp.getNumShapedOperands();
-  if (nShapedOperands == 0)
-    return linalgOp.emitOpError("expected at least 1 Shaped operand");
-  if (failed(OpTrait::impl::verifyAtLeastNOperands(op, nShapedOperands)))
-    return failure();
-  // Should have at least one output tensor per result tensor.
-  // Can also have outbut buffers that do not correspond to results.
-  if (op->getNumResults() > linalgOp.getNumOutputTensors())
-    return op->emitError("unexpected #results > #outputs");
-
-  // All shaped operands must be indexed.
-  if (linalgOp.indexing_maps().size() != linalgOp.getNumShapedOperands())
-    return linalgOp.emitOpError("expected the number of indexing_map (")
-           << linalgOp.indexing_maps().size()
-           << ") to be equal to the number of shaped operands ("
-           << linalgOp.getNumShapedOperands() << ")";
-
-  SmallVector<AffineMap, 4> indexingMaps;
-  indexingMaps.reserve(linalgOp.indexing_maps().size());
-  for (auto en : llvm::enumerate(linalgOp.indexing_maps())) {
-    auto idx = en.index();
-    auto m = en.value().template cast<AffineMapAttr>().getValue();
-    indexingMaps.push_back(m); // Save reference to map for further checks.
-    auto shapedValue = linalgOp.getShapedType(idx);
-
-    // Symbols disallowed.
-    if (m.getNumSymbols() != 0)
-      return linalgOp.emitOpError("unexpected symbols in indexing_map #")
-             << idx;
-
-    // Domain must be consistent.
-    auto nLoops = linalgOp.getNumLoops();
-    if (m.getNumDims() != nLoops)
-      return linalgOp.emitOpError("expected indexing_map #")
-             << idx << " to have " << nLoops
-             << " dim(s) to match the number of loops";
-
-    if (m.getNumResults() != shapedValue.getRank())
-      return linalgOp.emitOpError("expected shaped value rank (")
-             << shapedValue.getRank()
-             << ") to match the result rank of indexing_map #" << idx << " ("
-             << m.getNumResults() << ")";
-  }
-
-  SmallVector<AffineExpr, 4> redDims;
-  linalgOp.getReductionDims(redDims);
-
-  // Simplifying assumption: either full tensor or full buffer mode.
-  // This allows simpler verification of output operands vs result types
-  // without premature tracking of which operand is what in mixed-mode.
-  // TODO: relax when mixed-mode needs to pass verification.
-  if (linalgOp.getNumOutputBuffers() > 0 && linalgOp.getNumOutputTensors() > 0)
-    return op->emitError("expected output operands to all have tensor type or "
-                         "all have buffer type");
-
-  for (auto it :
-       llvm::zip(linalgOp.getOutputOpOperands(), op->getResultTypes())) {
-    if (!std::get<0>(it).get().getType().isa<RankedTensorType>())
-      continue;
-    if (std::get<0>(it).get().getType() != std::get<1>(it))
-      return op->emitError("expected type of operand #")
-             << std::get<0>(it).getOperandNumber() << " ("
-             << std::get<0>(it).get().getType() << ")"
-             << " to match type of corresponding result (" << std::get<1>(it)
-             << ")";
-  }
-
-  // Output tensor indexing map may not depend on reduction indices.
-  for (OpOperand &opOperand : linalgOp.getOutputOpOperands()) {
-    AffineMap outputMap = linalgOp.getIndexingMap(opOperand.getOperandNumber());
-    for (auto expr : outputMap.getResults()) {
-      for (auto dim : redDims) {
-        unsigned pos = dim.cast<AffineDimExpr>().getPosition();
-        if (expr.isFunctionOfDim(pos)) {
-          std::string exprStr;
-          {
-            llvm::raw_string_ostream os(exprStr);
-            os << expr;
-          }
-          return op->emitError(
-                     "unexpected output tensor expression in indexing map #")
-                 << (opOperand.getOperandNumber() - linalgOp.getNumInputs())
-                 << " a.k.a '" << exprStr
-                 << "' is function of reduction iterator 'd" << pos << "'";
-        }
-      }
-    }
-  }
-
-  // Named ops that are defined manually have a region builder but no region at
-  // this time. Assume the region is well-formed by specification.
-  // TODO: use linalg-ods-gen for all ops when we have enough expressive power.
-  if (linalgOp->getNumRegions() == 0) {
-    assert(!linalgOp.getRegionBuilder() && "regionBuilder but no region");
-    return success();
-  }
-
-  auto &region = linalgOp->getRegion(0);
-  if (linalgOp->getNumRegions() > 1 || !llvm::hasSingleElement(region))
-    return op->emitOpError("expected 1 region with 1 block");
-
-  if (!linalgOp.getShapesToLoopsMap())
-    return op->emitOpError("expected the shape-to-loops map to be non-null");
-
-  // Simplifying assumption: bbargs match 1-1 with shape operands elemental
-  // types.
-  // TODO: once ranked shape types are plugged in, we may want to drop the
-  // corresponding bbargs, that can never be read from. This will be subject to
-  // consistency discussions (i.e. what to do with output tensors whose bbarg is
-  // not used).
-  Block &block = linalgOp->getRegion(0).front();
-  unsigned numBBIvs = linalgOp.getNumPayloadInductionVariables();
-
-  if (linalgOp.getNumShapedOperands() + numBBIvs != block.getNumArguments())
-    return op->emitError("expected as many non-induction variable region "
-                         "arguments as the number of shaped operands");
-
-  // Note: the number and type of yield values are checked in the YieldOp.
-  for (unsigned i = 0; i < numBBIvs; ++i)
-    if (!block.getArgument(i).getType().isIndex())
-      return op->emitOpError("expected index block argument #") << i;
-
-  unsigned idx = 0;
-  for (auto it : llvm::zip(linalgOp.getShapedOperandTypes(),
-                           block.getArguments().drop_front(numBBIvs))) {
-    if (std::get<0>(it).getElementType() != std::get<1>(it).getType())
-      return op->emitError("expected type of bb argument #")
-             << (idx + numBBIvs) << " (" << std::get<1>(it).getType() << ")"
-             << " to match element type of corresponding shaped operand ("
-             << std::get<0>(it).getElementType() << ")";
-    ++idx;
-  }
-
-  return success();
-}
-
 namespace {
 
 template <typename GenericOpType>
 struct AnnotationsVerifier {
   static LogicalResult verify(GenericOpType op) { return success(); }
 };
 
 template <>

 DEFINE_POOLING_OP_GET_EFFECTS(PoolingMinOp)
 DEFINE_POOLING_OP_GET_EFFECTS(PoolingSumOp)
 
 namespace {
 struct EraseDeadLinalgOp;
 struct FoldTensorCastOp;
 } // namespace
 
-#include "mlir/Dialect/Linalg/IR/LinalgStructuredOpsInterfaces.cpp.inc"
-
 #include "mlir/Dialect/Linalg/IR/LinalgNamedStructuredOps.cpp.inc"
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/Linalg/IR/LinalgOps.cpp.inc"
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/Linalg/IR/LinalgStructuredOps.cpp.inc"
 

mlir/lib/Interfaces/CMakeLists.txt

 set(LLVM_OPTIONAL_SOURCES
   CallInterfaces.cpp
   CastInterfaces.cpp
   ControlFlowInterfaces.cpp
   CopyOpInterface.cpp
   DerivedAttributeOpInterface.cpp
   InferTypeOpInterface.cpp
+  LinalgInterfaces.cpp
   LoopLikeInterface.cpp
   SideEffectInterfaces.cpp
   VectorInterfaces.cpp
   ViewLikeInterface.cpp
   )
 
 function(add_mlir_interface_library name)
   add_mlir_library(MLIR${name}

mlir/lib/Interfaces/LinalgInterfaces.cpp

+//===- LinalgStructuredOpsInterface.cpp - Linalg interfaces implementation-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Interfaces/LinalgInterfaces.h"
+
+#include "mlir/Dialect/Affine/IR/AffineOps.h"
+#include "mlir/IR/AffineExprVisitor.h"
+#include "mlir/IR/AffineMap.h"
+#include "llvm/ADT/SmallSet.h"
+
+using namespace mlir;
+using namespace mlir::linalg;
+
+/// Include the definitions of the copy operation interface.
+#include "mlir/Interfaces/LinalgInterfaces.cpp.inc"
+
+/// Fully compose map with operands and canonicalize the result.
+/// Return the `createOrFold`'ed AffineApply op.
+static Value createFoldedComposedAffineApply(OpBuilder &b, Location loc,
+                                             AffineMap map,
+                                             ValueRange operandsRef) {
+  SmallVector<Value, 4> operands(operandsRef.begin(), operandsRef.end());
+  fullyComposeAffineMapAndOperands(&map, &operands);
+  canonicalizeMapAndOperands(&map, &operands);
+  return b.createOrFold<AffineApplyOp>(loc, map, operands);
+}
+
+SmallVector<Value, 4> mlir::linalg::applyMapToValues(OpBuilder &b, Location loc,
+                                                     AffineMap map,
+                                                     ValueRange values) {
+  SmallVector<Value, 4> res;
+  res.reserve(map.getNumResults());
+  unsigned numDims = map.getNumDims(), numSym = map.getNumSymbols();
+  // For each `expr` in `map`, applies the `expr` to the values extracted from
+  // ranges. If the resulting application can be folded into a Value, the
+  // folding occurs eagerly.
+  for (auto expr : map.getResults()) {
+    AffineMap map = AffineMap::get(numDims, numSym, expr);
+    res.push_back(createFoldedComposedAffineApply(b, loc, map, values));
+  }
+  return res;
+}
+
+SmallVector<Value, 4> LinalgOp::createFlatListOfOperandDims(OpBuilder &b,
+                                                            Location loc) {
+  SmallVector<Value, 4> res;
+  for (Value v : getShapedOperands()) {
+    ShapedType t = v.getType().template cast<ShapedType>();
+    for (unsigned i = 0, e = t.getRank(); i < e; ++i)
+      res.push_back(b.create<DimOp>(loc, v, i));
+  }
+  return res;
+}
+
+SmallVector<Range, 4> LinalgOp::createLoopRanges(OpBuilder &b, Location loc) {
+  AffineMap map = getLoopsToShapesMap();
+  unsigned numDims = map.getNumDims(), numRes = map.getNumResults();
+  auto viewSizes = createFlatListOfOperandDims(b, loc);
+  SmallVector<Range, 4> res(numDims);
+  Value zeroVal = b.create<ConstantIndexOp>(loc, 0);
+  Value oneVal = b.create<ConstantIndexOp>(loc, 1);
+  for (unsigned idx = 0; idx < numRes; ++idx) {
+    auto result = map.getResult(idx);
+    if (auto d = result.dyn_cast<AffineDimExpr>()) {
+      if (res[d.getPosition()].offset)
+        continue;
+      res[d.getPosition()] = Range{zeroVal, viewSizes[idx], oneVal};
+    }
+  }
+  return res;
+}
+
+/// Visitor to check if any of the given set of positions from AffineDimExprs
+/// are used within an AffineExpr.
+struct HasAffineDimExprVisitor
+    : public AffineExprVisitor<HasAffineDimExprVisitor, bool> {
+  HasAffineDimExprVisitor(llvm::SmallSet<unsigned, 4> &positions)
+      : positions(positions) {}
+
+  bool visitAffineBinaryOpExpr(AffineBinaryOpExpr binaryOpExpr) {
+    return visit(binaryOpExpr.getLHS()) || visit(binaryOpExpr.getRHS());
+  }
+
+  bool visitDimExpr(AffineDimExpr dimExpr) {
+    return positions.count(dimExpr.getPosition());
+  }
+
+  bool visitConstantExpr(AffineConstantExpr constExpr) { return false; }
+
+  bool visitSymbolExpr(AffineSymbolExpr symbolExpr) { return false; }
+
+private:
+  llvm::SmallSet<unsigned, 4> positions;
+};
+
+Optional<Value> LinalgOp::inferResultDimFromInputShapes(OpBuilder &b,
+                                                        Location loc,
+                                                        unsigned resultIdx,
+                                                        unsigned dim) {
+  // An example that helps understand the logic below.
+  // Consider the following expression O(i+j, j) += A(i,k) * B(k, j)
+  // We want to express the shape of dim 0 of O in terms of shape of the inputs.
+  // This is achieved as follows.
+  //   loopsToShapesMap = (d0, d1, d2) -> (d0, d2, d2, d1, d0 + d1, d1)
+  //   subMapOfResultDim = (d0, d1, d2) -> (d0 + d1)
+  //   shapesToLoopsMap = (d0, d2, d2, d3, d4, d5) -> (d0, d3, d2)
+  //   resultFromFromInputDim = subMapOfResultDim.compose(shapesToLoopMap)
+  //     = (d0, d1, d2, d3, d4, d5) -> (d0 + d1)
+  AffineMap loopsToShapesMap = getLoopsToShapesMap();
+
+  // Find the position in the above map that represents the shape of the
+  // result:dim being inferred.
+  Optional<unsigned> resultDimSubMapPos =
+      getResultValueDimPositionInLoopsToShapeMap(resultIdx, dim);
+  if (!resultDimSubMapPos)
+    return {};
+
+  /// From loopsToShapesMap extract the submap that represents the shape of the
+  /// (resultIdx, dim) needed
+  AffineMap loopToResultDimShapeMap =
+      loopsToShapesMap.getSubMap(*resultDimSubMapPos);
+  AffineMap operandShapesToResultDimMap =
+      loopToResultDimShapeMap.compose(getShapesToLoopsMap());
+
+  // Check that the result dim map does not contain the positions corresponding
+  // to the outputs.
+  llvm::SmallSet<unsigned, 4> outputDims;
+  unsigned outputDimPosStart =
+      getResultValueDimPositionInLoopsToShapeMap(0, 0).getValue();
+  unsigned outputDimPosEnd =
+      getResultValueDimPositionInLoopsToShapeMap(getNumOutputs() - 1,
+                                                 getOutputOpOperands()
+                                                         .back()
+                                                         .get()
+                                                         .getType()
+                                                         .cast<ShapedType>()
+                                                         .getRank() -
+                                                     1)
+          .getValue();
+  llvm::for_each(llvm::seq<unsigned>(outputDimPosStart, outputDimPosEnd),
+                 [&outputDims](unsigned dim) { outputDims.insert(dim); });
+  HasAffineDimExprVisitor checkDimExpr(outputDims);
+  if (checkDimExpr.visit(operandShapesToResultDimMap.getResult(0)))
+    return llvm::None;
+  return applyMapToValues(b, loc, operandShapesToResultDimMap,
+                          createFlatListOfOperandDims(b, loc))[0];
+}
+
+LogicalResult mlir::linalg::detail::verifyStructuredOpInterface(Operation *op) {
+  LinalgOp linalgOp = cast<LinalgOp>(op);
+  // Expect at least one shaped operand.
+  // This means an op that constructs a tensor out of indices cannot be a
+  // LinalgOp at the moment. For now this will have to be a special op until we
+  // have output shape operands that are not tensors.
+  auto nShapedOperands = linalgOp.getNumShapedOperands();
+  if (nShapedOperands == 0)
+    return linalgOp.emitOpError("expected at least 1 Shaped operand");
+  if (failed(OpTrait::impl::verifyAtLeastNOperands(op, nShapedOperands)))
+    return failure();
+  // Should have at least one output tensor per result tensor.
+  // Can also have outbut buffers that do not correspond to results.
+  if (op->getNumResults() > linalgOp.getNumOutputTensors())
+    return op->emitError("unexpected #results > #outputs");
+
+  // All shaped operands must be indexed.
+  if (linalgOp.indexing_maps().size() != linalgOp.getNumShapedOperands())
+    return linalgOp.emitOpError("expected the number of indexing_map (")
+           << linalgOp.indexing_maps().size()
+           << ") to be equal to the number of shaped operands ("
+           << linalgOp.getNumShapedOperands() << ")";
+
+  SmallVector<AffineMap, 4> indexingMaps;
+  indexingMaps.reserve(linalgOp.indexing_maps().size());
+  for (auto en : llvm::enumerate(linalgOp.indexing_maps())) {
+    auto idx = en.index();
+    auto m = en.value().template cast<AffineMapAttr>().getValue();
+    indexingMaps.push_back(m); // Save reference to map for further checks.
+    auto shapedValue = linalgOp.getShapedType(idx);
+
+    // Symbols disallowed.
+    if (m.getNumSymbols() != 0)
+      return linalgOp.emitOpError("unexpected symbols in indexing_map #")
+             << idx;
+
+    // Domain must be consistent.
+    auto nLoops = linalgOp.getNumLoops();
+    if (m.getNumDims() != nLoops)
+      return linalgOp.emitOpError("expected indexing_map #")
+             << idx << " to have " << nLoops
+             << " dim(s) to match the number of loops";
+
+    if (m.getNumResults() != shapedValue.getRank())
+      return linalgOp.emitOpError("expected shaped value rank (")
+             << shapedValue.getRank()
+             << ") to match the result rank of indexing_map #" << idx << " ("
+             << m.getNumResults() << ")";
+  }
+
+  SmallVector<AffineExpr, 4> redDims;
+  linalgOp.getReductionDims(redDims);
+
+  // Simplifying assumption: either full tensor or full buffer mode.
+  // This allows simpler verification of output operands vs result types
+  // without premature tracking of which operand is what in mixed-mode.
+  // TODO: relax when mixed-mode needs to pass verification.
+  if (linalgOp.getNumOutputBuffers() > 0 && linalgOp.getNumOutputTensors() > 0)
+    return op->emitError("expected output operands to all have tensor type or "
+                         "all have buffer type");
+
+  for (auto it :
+       llvm::zip(linalgOp.getOutputOpOperands(), op->getResultTypes())) {
+    if (!std::get<0>(it).get().getType().isa<RankedTensorType>())
+      continue;
+    if (std::get<0>(it).get().getType() != std::get<1>(it))
+      return op->emitError("expected type of operand #")
+             << std::get<0>(it).getOperandNumber() << " ("
+             << std::get<0>(it).get().getType() << ")"
+             << " to match type of corresponding result (" << std::get<1>(it)
+             << ")";
+  }
+
+  // Output tensor indexing map may not depend on reduction indices.
+  for (OpOperand &opOperand : linalgOp.getOutputOpOperands()) {
+    AffineMap outputMap = linalgOp.getIndexingMap(opOperand.getOperandNumber());
+    for (auto expr : outputMap.getResults()) {
+      for (auto dim : redDims) {
+        unsigned pos = dim.cast<AffineDimExpr>().getPosition();
+        if (expr.isFunctionOfDim(pos)) {
+          std::string exprStr;
+          {
+            llvm::raw_string_ostream os(exprStr);
+            os << expr;
+          }
+          return op->emitError(
+                     "unexpected output tensor expression in indexing map #")
+                 << (opOperand.getOperandNumber() - linalgOp.getNumInputs())
+                 << " a.k.a '" << exprStr
+                 << "' is function of reduction iterator 'd" << pos << "'";
+        }
+      }
+    }
+  }
+
+  // Named ops that are defined manually have a region builder but no region at
+  // this time. Assume the region is well-formed by specification.
+  // TODO: use linalg-ods-gen for all ops when we have enough expressive power.
+  if (linalgOp->getNumRegions() == 0) {
+    assert(!linalgOp.getRegionBuilder() && "regionBuilder but no region");
+    return success();
+  }
+
+  auto &region = linalgOp->getRegion(0);
+  if (linalgOp->getNumRegions() > 1 || !llvm::hasSingleElement(region))
+    return op->emitOpError("expected 1 region with 1 block");
+
+  if (!linalgOp.getShapesToLoopsMap())
+    return op->emitOpError("expected the shape-to-loops map to be non-null");
+
+  // Simplifying assumption: bbargs match 1-1 with shape operands elemental
+  // types.
+  // TODO: once ranked shape types are plugged in, we may want to drop the
+  // corresponding bbargs, that can never be read from. This will be subject to
+  // consistency discussions (i.e. what to do with output tensors whose bbarg is
+  // not used).
+  Block &block = linalgOp->getRegion(0).front();
+  unsigned numBBIvs = linalgOp.getNumPayloadInductionVariables();
+
+  if (linalgOp.getNumShapedOperands() + numBBIvs != block.getNumArguments())
+    return op->emitError("expected as many non-induction variable region "
+                         "arguments as the number of shaped operands");
+
+  // Note: the number and type of yield values are checked in the YieldOp.
+  for (unsigned i = 0; i < numBBIvs; ++i)
+    if (!block.getArgument(i).getType().isIndex())
+      return op->emitOpError("expected index block argument #") << i;
+
+  unsigned idx = 0;
+  for (auto it : llvm::zip(linalgOp.getShapedOperandTypes(),
+                           block.getArguments().drop_front(numBBIvs))) {
+    if (std::get<0>(it).getElementType() != std::get<1>(it).getType())
+      return op->emitError("expected type of bb argument #")
+             << (idx + numBBIvs) << " (" << std::get<1>(it).getType() << ")"
+             << " to match element type of corresponding shaped operand ("
+             << std::get<0>(it).getElementType() << ")";
+    ++idx;
+  }
+
+  return success();
+}

mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-gen.cpp

SingleBlockImplicitTerminator<"YieldOp">]> {
         }]>
         {5}
       ];
       let printer = [{{ return ::printNamedStructuredOp(p, *this); }];
       let parser = [{{ return ::parseNamedStructuredOp<{0}>(parser, result); }];
       let hasFolder = 1;
       let hasCanonicalizer = 1;
 
-      let extraClassDeclaration = [{{
+      let extraClassDeclaration = structuredOpsBaseDecls # [{{
         // Auto-generated.
         ArrayAttr iterator_types();
         ArrayAttr indexing_maps();
         static void regionBuilder(Block &block);
-        static std::function<void(Block &)> getRegionBuilder() {{ return regionBuilder; }
+        static std::function<void(Block &)> getRegionBuilder() {{
+          return regionBuilder;
+        }
 
         // Generic methods.
         static unsigned getNumRegionArgs() {{ return {4}; }
         std::string getLibraryCallName() {{
           return generateLibraryCallName(getOperation());
         }
       }];
   })FMT";