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//===- TestLoopParametricTiling.cpp --- Parametric loop tiling pass -------===//
//
// Copyright 2019 The MLIR Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// =============================================================================
//
// This file implements a pass to parametrically tile nests of standard loops.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/LoopOps/LoopOps.h"
#include "mlir/IR/Builders.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/LoopUtils.h"
#include "mlir/Transforms/Passes.h"
using namespace mlir;
static llvm::cl::list<int> clOuterLoopSizes(
"test-outer-loop-sizes", llvm::cl::MiscFlags::CommaSeparated,
llvm::cl::desc(
"fixed number of iterations that the outer loops should have"));
namespace {
// Extracts fixed-range loops for top-level loop nests with ranges defined in
// the pass constructor. Assumes loops are permutable.
class SimpleParametricLoopTilingPass
: public FunctionPass<SimpleParametricLoopTilingPass> {
public:
explicit SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes)
: sizes(outerLoopSizes.begin(), outerLoopSizes.end()) {}
void runOnFunction() override {
FuncOp func = getFunction();
func.walk<loop::ForOp>([this](loop::ForOp op) {
// Ignore nested loops.
if (op.getParentRegion()->getParentOfType<loop::ForOp>())
return;
extractFixedOuterLoops(op, sizes);
});
}
SmallVector<int64_t, 4> sizes;
};
} // end namespace
std::unique_ptr<FunctionPassBase>
mlir::createSimpleParametricTilingPass(ArrayRef<int64_t> outerLoopSizes) {
return llvm::make_unique<SimpleParametricLoopTilingPass>(outerLoopSizes);
}
static PassRegistration<SimpleParametricLoopTilingPass>
reg("test-extract-fixed-outer-loops",
"test application of parametric tiling to the outer loops so that the "
"ranges of outer loops become static",
[] {
auto pass = llvm::make_unique<SimpleParametricLoopTilingPass>(
ArrayRef<int64_t>{});
pass->sizes.assign(clOuterLoopSizes.begin(), clOuterLoopSizes.end());
return pass;
});
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