0602e8f77f
Add support to tile affine.for ops with parametric sizes (i.e., SSA values). Currently supports hyper-rectangular loop nests with constant lower bounds only. Move methods - moveLoopBody(*) - getTileableBands(*) - checkTilingLegality(*) - tilePerfectlyNested(*) - constructTiledIndexSetHyperRect(*) to allow reuse with constant tile size API. Add a test pass -test-affine -parametric-tile to test parametric tiling. Differential Revision: https://reviews.llvm.org/D87353
91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
//= TestAffineLoopParametricTiling.cpp -- Parametric Affine loop tiling pass =//
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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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//
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// This file implements a test pass to test parametric tiling of perfectly
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// nested affine for loops.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/Affine/IR/AffineOps.h"
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#include "mlir/Dialect/Affine/Passes.h"
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#include "mlir/Transforms/LoopUtils.h"
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using namespace mlir;
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#define DEBUG_TYPE "test-affine-parametric-tile"
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namespace {
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struct TestAffineLoopParametricTiling
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: public PassWrapper<TestAffineLoopParametricTiling, FunctionPass> {
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void runOnFunction() override;
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};
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} // end anonymous namespace
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/// Checks if the function enclosing the loop nest has any arguments passed to
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/// it, which can be used as tiling parameters. Assumes that atleast 'n'
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/// arguments are passed, where 'n' is the number of loops in the loop nest.
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static void checkIfTilingParametersExist(ArrayRef<AffineForOp> band) {
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assert(!band.empty() && "no loops in input band");
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AffineForOp topLoop = band[0];
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if (FuncOp funcOp = dyn_cast<FuncOp>(topLoop.getParentOp()))
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assert(funcOp.getNumArguments() >= band.size() && "Too few tile sizes");
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}
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/// Captures tiling parameters, which are expected to be passed as arguments
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/// to the function enclosing the loop nest. Also checks if the required
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/// parameters are of index type. This approach is temporary for testing
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/// purposes.
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static void getTilingParameters(ArrayRef<AffineForOp> band,
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SmallVectorImpl<Value> &tilingParameters) {
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AffineForOp topLoop = band[0];
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Region *funcOpRegion = topLoop.getParentRegion();
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unsigned nestDepth = band.size();
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for (BlockArgument blockArgument :
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funcOpRegion->getArguments().take_front(nestDepth)) {
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if (blockArgument.getArgNumber() < nestDepth) {
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assert(blockArgument.getType().isIndex() &&
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"expected tiling parameters to be of index type.");
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tilingParameters.push_back(blockArgument);
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}
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}
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}
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void TestAffineLoopParametricTiling::runOnFunction() {
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// Bands of loops to tile.
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std::vector<SmallVector<AffineForOp, 6>> bands;
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getTileableBands(getFunction(), &bands);
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// Tile each band.
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for (SmallVectorImpl<AffineForOp> &band : bands) {
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// Capture the tiling parameters from the arguments to the function
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// enclosing this loop nest.
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SmallVector<AffineForOp, 6> tiledNest;
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SmallVector<Value, 6> tilingParameters;
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// Check if tiling parameters are present.
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checkIfTilingParametersExist(band);
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// Get function arguments as tiling parameters.
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getTilingParameters(band, tilingParameters);
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if (failed(
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tilePerfectlyNestedParametric(band, tilingParameters, &tiledNest)))
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return signalPassFailure();
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}
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}
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namespace mlir {
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void registerTestAffineLoopParametricTilingPass() {
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PassRegistration<TestAffineLoopParametricTiling>(
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"test-affine-parametric-tile",
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"Tile affine loops using SSA values as tile sizes");
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}
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} // namespace mlir
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