01c4418544
This revision refactors code used in various Linalg transformations and makes it a first class citizen to the LinalgStructureOpInterface. This is in preparation to allowing more advanced Linalg behavior but is otherwise NFC. Differential revision: https://reviews.llvm.org/D91863
702 lines
28 KiB
C++
702 lines
28 KiB
C++
//===- Loops.cpp - conversion from Linalg named and generic ops to loops --===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PassDetail.h"
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#include "mlir/Dialect/Affine/EDSC/Intrinsics.h"
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#include "mlir/Dialect/Linalg/EDSC/FoldedIntrinsics.h"
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#include "mlir/Dialect/Linalg/IR/LinalgOps.h"
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#include "mlir/Dialect/Linalg/IR/LinalgTypes.h"
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#include "mlir/Dialect/Linalg/Passes.h"
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#include "mlir/Dialect/Linalg/Transforms/Transforms.h"
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#include "mlir/Dialect/Linalg/Utils/Utils.h"
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#include "mlir/Dialect/SCF/EDSC/Builders.h"
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#include "mlir/Dialect/StandardOps/EDSC/Intrinsics.h"
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#include "mlir/IR/AffineExpr.h"
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#include "mlir/IR/AffineMap.h"
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#include "mlir/IR/BlockAndValueMapping.h"
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#include "mlir/Support/LLVM.h"
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#include "mlir/Transforms/DialectConversion.h"
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#include "mlir/Transforms/FoldUtils.h"
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#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
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#include "llvm/ADT/TypeSwitch.h"
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using namespace mlir;
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using namespace mlir::edsc;
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using namespace mlir::edsc::intrinsics;
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using namespace mlir::linalg;
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using edsc::op::operator+;
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static SmallVector<Value, 8> makeCanonicalAffineApplies(OpBuilder &b,
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Location loc,
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AffineMap map,
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ArrayRef<Value> vals) {
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if (map.isEmpty())
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return {};
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assert(map.getNumInputs() == vals.size());
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SmallVector<Value, 8> res;
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res.reserve(map.getNumResults());
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auto dims = map.getNumDims();
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for (auto e : map.getResults()) {
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auto exprMap = AffineMap::get(dims, map.getNumSymbols(), e);
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SmallVector<Value, 4> operands(vals.begin(), vals.end());
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canonicalizeMapAndOperands(&exprMap, &operands);
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res.push_back(affine_apply(exprMap, operands));
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}
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return res;
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}
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static SmallVector<Value, 4> permuteIvs(ArrayRef<Value> ivs,
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Optional<AffineMap> permutation) {
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return permutation ? applyMapToValues(ScopedContext::getBuilderRef(),
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ScopedContext::getLocation(),
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permutation.getValue(), ivs)
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: SmallVector<Value, 4>(ivs.begin(), ivs.end());
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}
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template <typename IndexedValueType, typename OpType>
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static void inlineRegionAndEmitStore(OpType op, ArrayRef<Value> indexedValues,
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ArrayRef<SmallVector<Value, 8>> indexing,
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ArrayRef<Value> outputBuffers) {
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assert(op.getOperation()->getNumRegions() == 1 &&
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"Expected single region op");
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auto &b = ScopedContext::getBuilderRef();
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auto &block = op.getOperation()->getRegion(0).front();
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BlockAndValueMapping map;
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map.map(block.getArguments(), indexedValues);
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for (auto &op : block.without_terminator()) {
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assert(op.getNumRegions() == 0 && "expected a non-nested region");
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auto *newOp = b.clone(op, map);
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map.map(op.getResults(), newOp->getResults());
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}
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Operation &terminator = block.back();
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assert(isa<linalg::YieldOp>(terminator) &&
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"expected a yield op in the end of the region");
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for (unsigned i = 0, e = terminator.getNumOperands(); i < e; ++i) {
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IndexedValueType O(outputBuffers[i]);
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O(indexing[i]) = map.lookupOrDefault(terminator.getOperand(i));
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}
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}
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// Returns a pair that contains input indices and output indices of a
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// SingleInputPoolingOp `op`.
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struct InputAndOutputIndices {
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SmallVector<Value, 8> inputs;
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SmallVector<Value, 8> outputs;
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};
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template <typename SingleInputPoolingOp>
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static InputAndOutputIndices getInputAndOutputIndices(ArrayRef<Value> allIvs,
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SingleInputPoolingOp op) {
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auto &b = ScopedContext::getBuilderRef();
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auto loc = ScopedContext::getLocation();
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auto mapsRange = op.indexing_maps().template getAsRange<AffineMapAttr>();
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auto maps = llvm::to_vector<8>(
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llvm::map_range(mapsRange, [](AffineMapAttr a) { return a.getValue(); }));
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return InputAndOutputIndices{
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makeCanonicalAffineApplies(b, loc, maps[0], allIvs),
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makeCanonicalAffineApplies(b, loc, maps[2], allIvs)};
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}
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/// Emits the MLIR for the scalar part of the generic op by:
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/// 1. Emitting load ops for each input and output view in order. This is
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/// achieved by applying the appropriate input or output map to the
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/// enclosing induction variables.
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/// 2. Emitting a call to `op.fun()` that takes as arguments the scalars
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/// from point 1. above.
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/// 3. Emitting store ops to store the results of 2. to the output
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/// views.
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///
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/// An example output may resemble:
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///
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/// ```
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/// scf.for %i = %c0 to %0 step %c1 {
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/// scf.for %j = %c0 to %1 step %c1 {
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/// scf.for %k = %c0 to %4 step %c1 {
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/// %11 = load %arg0[%i, %j] :
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/// memref<?x?xf32, stride_specification>
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/// %12 = load %arg1[%i, %j, %k] :
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/// memref<?x?x?xf32, stride_specification>
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/// %13 = load %arg2[%i, %k, %j] :
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/// memref<?x?x?xf32, stride_specification>
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/// %14:2 = call @foo(%11, %12, %13) : (f32, f32, f32) -> (f32, f32)
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/// store %14#0, %arg1[%i, %j, %k] :
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/// memref<?x?x?Xf32, stride_specification>
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/// store %14#1, %arg2[%i, %k, %j] :
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/// memref<?x?x?Xf32, stride_specification>
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/// }
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/// }
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/// }
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/// ```
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs,
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LinalgOp linalgOp) {
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assert(linalgOp.hasBufferSemantics() &&
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"expected linalg op with buffer semantics");
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auto &b = ScopedContext::getBuilderRef();
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auto loc = ScopedContext::getLocation();
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unsigned nInputs = linalgOp.getNumInputs();
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unsigned nOutputs = linalgOp.getNumOutputs();
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SmallVector<Value, 4> indexedValues;
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indexedValues.reserve(nInputs + nOutputs);
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auto attr = linalgOp.template getAttrOfType<IntegerAttr>("symbol_source");
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auto allIvsPlusDims = SmallVector<Value, 4>(allIvs.begin(), allIvs.end());
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if (attr) {
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auto operand = linalgOp.getOperation()->getOperand(attr.getInt());
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auto shapedType = operand.getType().template cast<ShapedType>();
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allIvsPlusDims.reserve(allIvs.size() + shapedType.getRank());
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for (unsigned idx = 0, e = shapedType.getRank(); idx < e; ++idx)
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allIvsPlusDims.push_back(b.create<DimOp>(loc, operand, idx));
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}
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// TODO: Avoid the loads if the corresponding argument of the
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// region has no uses.
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// 1.a. Emit load from input views.
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for (unsigned i = 0; i < nInputs; ++i) {
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auto indexing = makeCanonicalAffineApplies(
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b, loc, linalgOp.getInputIndexingMap(i), allIvsPlusDims);
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// Passing through IndexedValueType emits the proper load operation.
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indexedValues.push_back(IndexedValueType(linalgOp.getInput(i))(indexing));
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}
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// 1.b. Emit load from output views.
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for (unsigned i = 0; i < nOutputs; ++i) {
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auto indexing = makeCanonicalAffineApplies(
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b, loc, linalgOp.getOutputIndexingMap(i), allIvsPlusDims);
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// Passing through IndexedValueType emits the proper load operation.
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indexedValues.push_back(
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IndexedValueType(linalgOp.getOutputBuffer(i))(indexing));
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}
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// TODO: When a region inliner exists, use it.
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// 2. Inline region, currently only works for a single basic block.
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// 3. Emit store.
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SmallVector<SmallVector<Value, 8>, 8> indexing;
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SmallVector<Value, 8> outputBuffers;
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for (unsigned i = 0; i < nOutputs; ++i) {
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indexing.push_back(makeCanonicalAffineApplies(
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b, loc, linalgOp.getOutputIndexingMap(i), allIvsPlusDims));
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outputBuffers.push_back(linalgOp.getOutputBuffer(i));
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}
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inlineRegionAndEmitStore<IndexedValueType>(linalgOp, indexedValues, indexing,
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outputBuffers);
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}
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs, CopyOp copyOp) {
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assert(copyOp.hasBufferSemantics() &&
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"expected linalg op with buffer semantics");
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auto nPar = copyOp.getNumParallelLoops();
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assert(nPar == allIvs.size());
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auto inputIvs =
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permuteIvs(allIvs.take_front(nPar), copyOp.inputPermutation());
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auto outputIvs =
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permuteIvs(allIvs.take_front(nPar), copyOp.outputPermutation());
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SmallVector<Value, 8> iivs(inputIvs.begin(), inputIvs.end());
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SmallVector<Value, 8> oivs(outputIvs.begin(), outputIvs.end());
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IndexedValueType O(copyOp.getOutputBuffer(0)), I(copyOp.getInput(0));
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// Emit the proper scalar assignment, whether we are dealing with a 0-D or
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// an n-D loop nest; with or without permutations.
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// clang-format off
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nPar > 0 ? O(oivs) = I(iivs) :
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O() = I();
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// clang-format on
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}
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs, FillOp fillOp) {
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assert(fillOp.hasBufferSemantics() &&
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"expected linalg op with buffer semantics");
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auto nPar = fillOp.getNumParallelLoops();
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assert(nPar == allIvs.size());
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auto ivs = SmallVector<Value, 4>(allIvs.begin(), allIvs.begin() + nPar);
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IndexedValueType O(fillOp.getOutputBuffer(0));
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// Emit the proper scalar assignment, whether we are dealing with a 0-D or
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// an n-D loop nest; with or without permutations.
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nPar > 0 ? O(ivs) = fillOp.value() : O() = fillOp.value();
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}
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// Create a padded view into the given `input` tensor using the 'indices'
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// to access the tensor. `skipPadding` lists the dimensions for which no padding
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// is needed e.g. the non-spatial dimensions for convolutions.
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template <typename IndexedValueType>
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Value getPaddedInput(Value input, ArrayRef<Value> indices,
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ArrayRef<int> skipPadding, Value padValue) {
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// TODO: add a level of indirection to linalg.generic.
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IndexedValueType indexedInput(input);
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auto *context = ScopedContext::getContext();
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Value zeroIndex = std_constant_index(0);
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SmallVector<Value, 8> conds;
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SmallVector<Value, 8> clampedImIdx;
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for (auto iter : llvm::enumerate(indices)) {
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int idx = iter.index();
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auto dim = iter.value();
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if (is_contained(skipPadding, idx)) {
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clampedImIdx.push_back(dim);
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continue;
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}
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using edsc::op::sge;
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using edsc::op::slt;
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using edsc::op::operator||;
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Value leftOutOfBound = slt(dim, zeroIndex);
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if (conds.empty())
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conds.push_back(leftOutOfBound);
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else
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conds.push_back(conds.back() || leftOutOfBound);
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Value rightBound = std_dim(input, idx);
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conds.push_back(conds.back() || (sge(dim, rightBound)));
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// When padding is involved, the indices will only be shifted to negative,
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// so having a max op is enough.
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auto maxMap = AffineMap::get(/*dimCount=*/1, 0,
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{getAffineDimExpr(/*position=*/0, context),
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getAffineConstantExpr(0, context)},
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context);
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clampedImIdx.push_back(affine_max(dim.getType(), maxMap, ValueRange{dim}));
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}
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Value readInput = indexedInput(clampedImIdx);
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return conds.empty() ? readInput
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: (Value)std_select(conds.back(), padValue, readInput);
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}
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namespace {
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/// The padding value for a given Op depends on the semantics of the Op.
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/// The identity value for ConvOp and PoolingSumOp is 0, for PoolingMaxOp is
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/// -inf or minInt and for PoolingMinOp is inf or maxInt.
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template <typename OpType>
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Attribute getPadValueAttr(Type type) {
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llvm_unreachable("Unexpected op type for getPadValueAttr");
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return {};
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}
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template <>
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Attribute getPadValueAttr<PoolingMaxOp>(Type type) {
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auto &b = ScopedContext::getBuilderRef();
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if (auto floatType = type.dyn_cast<FloatType>()) {
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return b.getFloatAttr(
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floatType,
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APFloat::getInf(floatType.getFloatSemantics(), /*Negative*/ true));
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}
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if (auto intType = type.dyn_cast<IntegerType>()) {
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unsigned width = intType.getWidth();
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// The select instruction used to lower the PoolingMin uses a signed
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// comparison, use a signed constant irrespective of the signedness of the
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// integer type.
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return b.getIntegerAttr(intType, APInt::getSignedMinValue(width));
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}
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llvm_unreachable("Unsupported data type for PoolingMaxOp");
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return {};
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}
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template <>
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Attribute getPadValueAttr<PoolingMinOp>(Type type) {
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auto &b = ScopedContext::getBuilderRef();
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if (auto floatType = type.dyn_cast<FloatType>()) {
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return b.getFloatAttr(floatType,
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APFloat::getInf(floatType.getFloatSemantics()));
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}
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if (auto intType = type.dyn_cast<IntegerType>()) {
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unsigned width = intType.getWidth();
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// The select instruction used to lower the PoolingMin uses a signed
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// comparison, use a signed constant irrespective of the signedness of the
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// integer type.
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return b.getIntegerAttr(intType, APInt::getSignedMaxValue(width));
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}
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llvm_unreachable("Unsupported data type for PoolingMinOp");
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return {};
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}
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template <>
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Attribute getPadValueAttr<PoolingSumOp>(Type type) {
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auto &b = ScopedContext::getBuilderRef();
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return b.getZeroAttr(type);
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}
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template <>
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Attribute getPadValueAttr<ConvOp>(Type type) {
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auto &b = ScopedContext::getBuilderRef();
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return b.getZeroAttr(type);
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}
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} // namespace
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/// Returns true is `convOp` has a non-zero padding.
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static bool hasPadding(ConvOp convOp) {
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for (unsigned i = 0, e = convOp.getNumSpatialDimensions(); i < e; ++i) {
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if (convOp.getLowPad(i) > 0 || convOp.getHighPad(i) > 0)
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return true;
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}
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return false;
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}
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs, ConvOp convOp) {
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assert(convOp.hasBufferSemantics() &&
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"expected linalg op with buffer semantics");
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auto &b = ScopedContext::getBuilderRef();
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auto loc = ScopedContext::getLocation();
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auto mapsRange = convOp.indexing_maps().getAsRange<AffineMapAttr>();
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auto maps = llvm::to_vector<8>(
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llvm::map_range(mapsRange, [](AffineMapAttr a) { return a.getValue(); }));
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SmallVector<Value, 8> fIdx(
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makeCanonicalAffineApplies(b, loc, maps[0], allIvs));
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SmallVector<Value, 8> imIdx(
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makeCanonicalAffineApplies(b, loc, maps[1], allIvs));
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SmallVector<Value, 8> oIdx(
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makeCanonicalAffineApplies(b, loc, maps[2], allIvs));
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IndexedValueType F(convOp.filter()), O(convOp.output());
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// Emit scalar form. Padded conv involves an affine.max in the memory access
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// which is not allowed by affine.load. Override to use an StdIndexedValue
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// when there is non-zero padding.
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if (hasPadding(convOp)) {
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Type type = convOp.input().getType().cast<MemRefType>().getElementType();
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Value padValue = std_constant(type, getPadValueAttr<ConvOp>(type));
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Value paddedInput = getPaddedInput<StdIndexedValue>(
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convOp.input(), imIdx,
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/* Only need to pad the window dimensions */
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{0, static_cast<int>(imIdx.size()) - 1}, padValue);
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O(oIdx) += F(fIdx) * paddedInput;
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} else {
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IndexedValueType I(convOp.input());
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O(oIdx) += F(fIdx) * I(imIdx);
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}
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}
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template <typename PoolingOp>
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static bool hasPadding(PoolingOp poolingOp) {
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for (unsigned i = 0, e = poolingOp.getNumWindowLoops(); i < e; ++i) {
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if (poolingOp.getLowPad(i) > 0 || poolingOp.getHighPad(i) > 0)
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return true;
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}
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return false;
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}
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template <typename IndexedValueType, typename PoolingOp>
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static Value getPoolingInput(PoolingOp op, ArrayRef<Value> inputIndices) {
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if (hasPadding(op)) {
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Type type =
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op.input().getType().template cast<MemRefType>().getElementType();
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Value padValue = std_constant(type, getPadValueAttr<PoolingOp>(type));
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return getPaddedInput<StdIndexedValue>(op.input(), inputIndices,
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/*Pad every dimension*/ {},
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padValue);
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}
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IndexedValueType input(op.input());
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return input(inputIndices);
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}
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template <typename IndexedValueType, typename OpType>
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void emitPoolingMinMaxScalarImplementation(ArrayRef<Value> allIvs, OpType op) {
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InputAndOutputIndices indices = getInputAndOutputIndices(allIvs, op);
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// Emit scalar form.
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IndexedValueType output(op.output());
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Value lhs = output(indices.outputs);
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Value rhs = getPoolingInput<IndexedValueType>(op, indices.inputs);
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using edsc::op::sgt;
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using edsc::op::slt;
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Value value = std::is_same<OpType, PoolingMinOp>()
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? std_select(slt(lhs, rhs), lhs, rhs)
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: std_select(sgt(lhs, rhs), lhs, rhs);
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output(indices.outputs) = value;
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}
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs, PoolingMaxOp op) {
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emitPoolingMinMaxScalarImplementation<IndexedValueType, PoolingMaxOp>(allIvs,
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op);
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}
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template <typename IndexedValueType>
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static void emitScalarImplementation(ArrayRef<Value> allIvs, PoolingMinOp op) {
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emitPoolingMinMaxScalarImplementation<IndexedValueType, PoolingMinOp>(allIvs,
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op);
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}
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|
|
|
template <typename IndexedValueType>
|
|
static void emitScalarImplementation(ArrayRef<Value> allIvs, PoolingSumOp op) {
|
|
auto indices = getInputAndOutputIndices(allIvs, op);
|
|
IndexedValueType output(op.output());
|
|
|
|
// Emit scalar form.
|
|
output(indices.outputs) +=
|
|
getPoolingInput<IndexedValueType>(op, indices.inputs);
|
|
}
|
|
|
|
/// Emits the MLIR for the scalar part of the indexed generic op by:
|
|
/// 1. Emitting load ops for each input and output view in order. This is
|
|
/// achieved by applying the appropriate input or output map to the
|
|
/// enclosing induction variables.
|
|
/// 2. Emitting a call to `op.fun()` that takes as arguments the induction
|
|
/// variables and the scalars from point 1. above.
|
|
/// 3. Emitting store ops to store the results of 2. to the output views.
|
|
///
|
|
/// An example output may resemble:
|
|
///
|
|
/// ```
|
|
/// scf.for %i = %c0 to %0 step %c1 {
|
|
/// scf.for %j = %c0 to %1 step %c1 {
|
|
/// scf.for %k = %c0 to %4 step %c1 {
|
|
/// %11 = load %arg0[%i, %j] :
|
|
/// memref<?x?xf32, stride_specification>
|
|
/// %12 = load %arg1[%i, %j, %k] :
|
|
/// memref<?x?x?xf32, stride_specification>
|
|
/// %13 = load %arg2[%i, %k, %j] :
|
|
/// memref<?x?x?xf32, stride_specification>
|
|
/// %14:2 = call @foo(%i, %j, %k, %11, %12, %13) :
|
|
/// (index, index, index, f32, f32, f32) -> (f32, f32)
|
|
/// store %14#0, %arg1[%i, %j, %k] :
|
|
/// memref<?x?x?Xf32, stride_specification>
|
|
/// store %14#1, %arg2[%i, %k, %j] :
|
|
/// memref<?x?x?Xf32, stride_specification>
|
|
/// }
|
|
/// }
|
|
/// }
|
|
/// ```
|
|
template <typename IndexedValueType>
|
|
static void emitScalarImplementation(ArrayRef<Value> allIvs,
|
|
IndexedGenericOp indexedGenericOp) {
|
|
assert(indexedGenericOp.hasBufferSemantics() &&
|
|
"expected linalg op with buffer semantics");
|
|
auto &b = ScopedContext::getBuilderRef();
|
|
auto loc = ScopedContext::getLocation();
|
|
unsigned nInputs = indexedGenericOp.getNumInputs();
|
|
unsigned nOutputs = indexedGenericOp.getNumOutputs();
|
|
unsigned nLoops = allIvs.size();
|
|
SmallVector<Value, 4> indexedValues;
|
|
indexedValues.reserve(nLoops + nInputs + nOutputs);
|
|
for (unsigned i = 0; i < nLoops; ++i)
|
|
indexedValues.push_back(allIvs[i]);
|
|
|
|
// TODO: Avoid the loads if the corresponding argument of the
|
|
// region has no uses.
|
|
// 1.a. Emit load from input views.
|
|
for (unsigned i = 0; i < nInputs; ++i) {
|
|
auto indexing = makeCanonicalAffineApplies(
|
|
b, loc, indexedGenericOp.getInputIndexingMap(i), allIvs);
|
|
// Pass input i through IndexedValueType emits the proper load operation.
|
|
indexedValues.push_back(
|
|
IndexedValueType(indexedGenericOp.getInput(i))(indexing));
|
|
}
|
|
// 1.b. Emit load from output views.
|
|
for (unsigned i = 0; i < nOutputs; ++i) {
|
|
auto indexing = makeCanonicalAffineApplies(
|
|
b, loc, indexedGenericOp.getOutputIndexingMap(i), allIvs);
|
|
// Pass output i through IndexedValueType emits the proper load operation.
|
|
indexedValues.push_back(
|
|
IndexedValueType(indexedGenericOp.getOutputBuffer(i))(indexing));
|
|
}
|
|
|
|
// TODO: When a region inliner exists, use it.
|
|
// 2. Inline region, currently only works for a single basic block.
|
|
// 3. Emit store.
|
|
SmallVector<SmallVector<Value, 8>, 8> indexing;
|
|
SmallVector<Value, 8> outputBuffers;
|
|
for (unsigned i = 0; i < nOutputs; ++i) {
|
|
indexing.push_back(makeCanonicalAffineApplies(
|
|
b, loc, indexedGenericOp.getOutputIndexingMap(i), allIvs));
|
|
outputBuffers.push_back(indexedGenericOp.getOutputBuffer(i));
|
|
}
|
|
inlineRegionAndEmitStore<IndexedValueType>(indexedGenericOp, indexedValues,
|
|
indexing, outputBuffers);
|
|
}
|
|
|
|
template <typename LoopTy>
|
|
static Optional<LinalgLoops> linalgOpToLoopsImpl(Operation *op,
|
|
OpBuilder &builder) {
|
|
using IndexedValueTy = typename GenerateLoopNest<LoopTy>::IndexedValueTy;
|
|
|
|
ScopedContext scope(builder, op->getLoc());
|
|
|
|
// The flattened loopToOperandRangesMaps is expected to be an invertible
|
|
// permutation map (which is asserted in the inverse calculation).
|
|
auto linalgOp = cast<LinalgOp>(op);
|
|
assert(linalgOp.hasBufferSemantics() &&
|
|
"expected linalg op with buffer semantics");
|
|
auto loopRanges = linalgOp.createLoopRanges(builder, op->getLoc());
|
|
SmallVector<Value, 4> allIvs;
|
|
GenerateLoopNest<LoopTy>::doit(
|
|
loopRanges, /*iterInitArgs*/ {}, linalgOp.iterator_types().getValue(),
|
|
[&](ValueRange ivs, ValueRange iterArgs) -> scf::ValueVector {
|
|
assert(iterArgs.empty() && "unexpected iterArgs");
|
|
allIvs.append(ivs.begin(), ivs.end());
|
|
llvm::TypeSwitch<Operation *>(op)
|
|
.Case<CopyOp, FillOp, ConvOp, PoolingMaxOp, PoolingMinOp,
|
|
PoolingSumOp, IndexedGenericOp, LinalgOp>([&](auto op) {
|
|
emitScalarImplementation<IndexedValueTy>(allIvs, op);
|
|
})
|
|
.Default([&](Operation *op) { assert(false && "unexpected op"); });
|
|
return scf::ValueVector{};
|
|
});
|
|
// Number of loop ops might be different from the number of ivs since some
|
|
// loops like affine.parallel and scf.parallel have multiple ivs.
|
|
llvm::SetVector<Operation *> loopSet;
|
|
for (Value iv : allIvs) {
|
|
if (!iv)
|
|
return {};
|
|
// The induction variable is a block argument of the entry block of the
|
|
// loop operation.
|
|
BlockArgument ivVal = iv.dyn_cast<BlockArgument>();
|
|
if (!ivVal)
|
|
return {};
|
|
loopSet.insert(ivVal.getOwner()->getParentOp());
|
|
}
|
|
LinalgLoops loops(loopSet.begin(), loopSet.end());
|
|
return loops;
|
|
}
|
|
|
|
namespace {
|
|
template <typename LoopType>
|
|
class LinalgRewritePattern : public RewritePattern {
|
|
public:
|
|
LinalgRewritePattern() : RewritePattern(/*benefit=*/1, MatchAnyOpTypeTag()) {}
|
|
|
|
LogicalResult matchAndRewrite(Operation *op,
|
|
PatternRewriter &rewriter) const override {
|
|
if (!isa<LinalgOp>(op))
|
|
return failure();
|
|
if (!linalgOpToLoopsImpl<LoopType>(op, rewriter))
|
|
return failure();
|
|
rewriter.eraseOp(op);
|
|
return success();
|
|
}
|
|
};
|
|
|
|
struct FoldAffineOp;
|
|
} // namespace
|
|
|
|
template <typename LoopType>
|
|
static void lowerLinalgToLoopsImpl(FuncOp funcOp, MLIRContext *context) {
|
|
OwningRewritePatternList patterns;
|
|
patterns.insert<LinalgRewritePattern<LoopType>>();
|
|
DimOp::getCanonicalizationPatterns(patterns, context);
|
|
AffineApplyOp::getCanonicalizationPatterns(patterns, context);
|
|
patterns.insert<FoldAffineOp>(context);
|
|
// Just apply the patterns greedily.
|
|
applyPatternsAndFoldGreedily(funcOp, std::move(patterns));
|
|
}
|
|
|
|
namespace {
|
|
/// Local folding pattern for AffineApplyOp that we can apply greedily.
|
|
/// This replaces AffineApplyOp by the proper value in cases where the
|
|
/// associated map is trivial.
|
|
/// A trivial map here is defined as a map with a single result and either:
|
|
/// 1. Zero operand + returns a single AffineConstantExpr
|
|
/// 2. One operand + returns a single AffineDimExpr
|
|
/// 3. One operand + returns a single AffineSymbolExpr
|
|
//
|
|
/// In the first case, the AffineApplyOp is replaced by a new constant. In the
|
|
/// other cases, it is replaced by its unique operand.
|
|
struct FoldAffineOp : public RewritePattern {
|
|
FoldAffineOp(MLIRContext *context)
|
|
: RewritePattern(AffineApplyOp::getOperationName(), 0, context) {}
|
|
|
|
LogicalResult matchAndRewrite(Operation *op,
|
|
PatternRewriter &rewriter) const override {
|
|
AffineApplyOp affineApplyOp = cast<AffineApplyOp>(op);
|
|
auto map = affineApplyOp.getAffineMap();
|
|
if (map.getNumResults() != 1 || map.getNumInputs() > 1)
|
|
return failure();
|
|
|
|
AffineExpr expr = map.getResult(0);
|
|
if (map.getNumInputs() == 0) {
|
|
if (auto val = expr.dyn_cast<AffineConstantExpr>()) {
|
|
rewriter.replaceOpWithNewOp<ConstantIndexOp>(op, val.getValue());
|
|
return success();
|
|
}
|
|
return failure();
|
|
}
|
|
if (expr.dyn_cast<AffineDimExpr>() || expr.dyn_cast<AffineSymbolExpr>()) {
|
|
rewriter.replaceOp(op, op->getOperand(0));
|
|
return success();
|
|
}
|
|
return failure();
|
|
}
|
|
};
|
|
|
|
struct LowerToAffineLoops
|
|
: public LinalgLowerToAffineLoopsBase<LowerToAffineLoops> {
|
|
void runOnFunction() override {
|
|
lowerLinalgToLoopsImpl<AffineForOp>(getFunction(), &getContext());
|
|
}
|
|
};
|
|
|
|
struct LowerToLoops : public LinalgLowerToLoopsBase<LowerToLoops> {
|
|
void runOnFunction() override {
|
|
lowerLinalgToLoopsImpl<scf::ForOp>(getFunction(), &getContext());
|
|
}
|
|
};
|
|
|
|
struct LowerToParallelLoops
|
|
: public LinalgLowerToParallelLoopsBase<LowerToParallelLoops> {
|
|
void runOnFunction() override {
|
|
lowerLinalgToLoopsImpl<scf::ParallelOp>(getFunction(), &getContext());
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
std::unique_ptr<OperationPass<FuncOp>> mlir::createConvertLinalgToLoopsPass() {
|
|
return std::make_unique<LowerToLoops>();
|
|
}
|
|
|
|
std::unique_ptr<OperationPass<FuncOp>>
|
|
mlir::createConvertLinalgToParallelLoopsPass() {
|
|
return std::make_unique<LowerToParallelLoops>();
|
|
}
|
|
|
|
std::unique_ptr<OperationPass<FuncOp>>
|
|
mlir::createConvertLinalgToAffineLoopsPass() {
|
|
return std::make_unique<LowerToAffineLoops>();
|
|
}
|
|
|
|
/// Emits a loop nest with the proper body for `op`.
|
|
template <typename LoopTy>
|
|
Optional<LinalgLoops> mlir::linalg::linalgLowerOpToLoops(OpBuilder &builder,
|
|
Operation *op) {
|
|
return linalgOpToLoopsImpl<LoopTy>(op, builder);
|
|
}
|
|
|
|
template Optional<LinalgLoops>
|
|
mlir::linalg::linalgLowerOpToLoops<AffineForOp>(OpBuilder &builder,
|
|
Operation *op);
|
|
template Optional<LinalgLoops>
|
|
mlir::linalg::linalgLowerOpToLoops<scf::ForOp>(OpBuilder &builder,
|
|
Operation *op);
|
|
template Optional<LinalgLoops>
|
|
mlir::linalg::linalgLowerOpToLoops<scf::ParallelOp>(OpBuilder &builder,
|
|
Operation *op);
|
|
|
|
/// Emits a loop nest of `affine.for` with the proper body for `op`.
|
|
LogicalResult mlir::linalg::linalgOpToAffineLoops(OpBuilder &builder,
|
|
Operation *op) {
|
|
Optional<LinalgLoops> loops = linalgLowerOpToLoops<AffineForOp>(builder, op);
|
|
return loops ? success() : failure();
|
|
}
|
|
|
|
/// Emits a loop nest of `scf.for` with the proper body for `op`.
|
|
LogicalResult mlir::linalg::linalgOpToLoops(OpBuilder &builder, Operation *op) {
|
|
Optional<LinalgLoops> loops = linalgLowerOpToLoops<scf::ForOp>(builder, op);
|
|
return loops ? success() : failure();
|
|
}
|
|
|
|
/// Emits a loop nest of `scf.parallel` with the proper body for `op`.
|
|
LogicalResult mlir::linalg::linalgOpToParallelLoops(OpBuilder &builder,
|
|
Operation *op) {
|
|
Optional<LinalgLoops> loops =
|
|
linalgLowerOpToLoops<scf::ParallelOp>(builder, op);
|
|
return loops ? success() : failure();
|
|
}
|