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//===- Interchange.cpp - Linalg interchange transformation ----------------===//
//
// 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 linalg interchange transformation.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Linalg/Analysis/DependenceAnalysis.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
#include "mlir/Dialect/Linalg/Transforms/Transforms.h"
#include "mlir/Dialect/Linalg/Utils/Utils.h"
#include "mlir/Dialect/Utils/IndexingUtils.h"
#include "mlir/Dialect/Utils/StructuredOpsUtils.h"
#include "mlir/Dialect/Vector/IR/VectorOps.h"
#include "mlir/IR/AffineExpr.h"
#include "mlir/IR/Matchers.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Support/LLVM.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <type_traits>
#define DEBUG_TYPE "linalg-interchange"
using namespace mlir;
using namespace mlir::linalg;
static LogicalResult
interchangeGenericOpPrecondition(GenericOp genericOp,
ArrayRef<unsigned> interchangeVector) {
// Interchange vector must be non-empty and match the number of loops.
if (interchangeVector.empty() ||
genericOp.getNumLoops() != interchangeVector.size())
return failure();
// Permutation map must be invertible.
if (!inversePermutation(AffineMap::getPermutationMap(interchangeVector,
genericOp.getContext())))
return failure();
return success();
}
FailureOr<GenericOp>
mlir::linalg::interchangeGenericOp(RewriterBase &rewriter, GenericOp genericOp,
ArrayRef<unsigned> interchangeVector) {
if (failed(interchangeGenericOpPrecondition(genericOp, interchangeVector)))
return rewriter.notifyMatchFailure(genericOp, "preconditions not met");
// 1. Compute the inverse permutation map, it must be non-null since the
// preconditions are satisfied.
MLIRContext *context = genericOp.getContext();
AffineMap permutationMap = inversePermutation(
AffineMap::getPermutationMap(interchangeVector, context));
assert(permutationMap && "unexpected null map");
// Start a guarded inplace update.
rewriter.startRootUpdate(genericOp);
auto guard =
llvm::make_scope_exit([&]() { rewriter.finalizeRootUpdate(genericOp); });
// 2. Compute the interchanged indexing maps.
SmallVector<AffineMap> newIndexingMaps;
for (OpOperand *opOperand : genericOp.getInputAndOutputOperands()) {
AffineMap m = genericOp.getTiedIndexingMap(opOperand);
if (!permutationMap.isEmpty())
m = m.compose(permutationMap);
newIndexingMaps.push_back(m);
}
genericOp->setAttr(getIndexingMapsAttrName(),
rewriter.getAffineMapArrayAttr(newIndexingMaps));
// 3. Compute the interchanged iterator types.
ArrayRef<Attribute> itTypes = genericOp.iterator_types().getValue();
SmallVector<Attribute> itTypesVector;
llvm::append_range(itTypesVector, itTypes);
SmallVector<int64_t> permutation(interchangeVector.begin(),
interchangeVector.end());
applyPermutationToVector(itTypesVector, permutation);
genericOp->setAttr(getIteratorTypesAttrName(),
ArrayAttr::get(context, itTypesVector));
// 4. Transform the index operations by applying the permutation map.
if (genericOp.hasIndexSemantics()) {
OpBuilder::InsertionGuard guard(rewriter);
for (IndexOp indexOp :
llvm::make_early_inc_range(genericOp.getBody()->getOps<IndexOp>())) {
rewriter.setInsertionPoint(indexOp);
SmallVector<Value> allIndices;
allIndices.reserve(genericOp.getNumLoops());
llvm::transform(llvm::seq<uint64_t>(0, genericOp.getNumLoops()),
std::back_inserter(allIndices), [&](uint64_t dim) {
return rewriter.create<IndexOp>(indexOp->getLoc(), dim);
});
rewriter.replaceOpWithNewOp<AffineApplyOp>(
indexOp, permutationMap.getSubMap(indexOp.dim()), allIndices);
}
}
return genericOp;
}
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