dfaebe7f48
This patch is forcing all values to be initialized by the LivenessAnalysis, even in dead blocks. The dataflow framework will skip visiting values when its already knows that a block is dynamically unreachable, so this requires specific handling. Downstream code could consider that the absence of liveness is the same a "dead". However as the code is mutated, new value can be introduced, and a transformation like "RemoveDeadValue" must conservatively consider that the absence of liveness information meant that we weren't sure if a value was dead (it could be a newly introduced value. Fixes #153906
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===- TestLivenessAnalysis.cpp - Test liveness analysis ------------------===//
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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 <llvm/ADT/STLExtras.h>
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#include <llvm/Support/raw_ostream.h>
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#include <mlir/Analysis/DataFlow/LivenessAnalysis.h>
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#include <cassert>
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#include <mlir/Analysis/DataFlowFramework.h>
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#include <mlir/IR/BuiltinAttributes.h>
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#include <mlir/IR/Operation.h>
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#include <mlir/IR/SymbolTable.h>
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#include <mlir/Pass/Pass.h>
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#include <mlir/Pass/PassRegistry.h>
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#include <mlir/Support/LLVM.h>
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#include <mlir/Support/TypeID.h>
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using namespace mlir;
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using namespace mlir::dataflow;
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namespace {
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struct TestLivenessAnalysisPass
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: public PassWrapper<TestLivenessAnalysisPass, OperationPass<>> {
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MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestLivenessAnalysisPass)
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StringRef getArgument() const override { return "test-liveness-analysis"; }
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void runOnOperation() override {
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auto &livenessAnalysis = getAnalysis<RunLivenessAnalysis>();
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Operation *op = getOperation();
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raw_ostream &os = llvm::outs();
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op->walk([&](Operation *op) {
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auto tag = op->getAttrOfType<StringAttr>("tag");
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if (!tag)
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return;
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os << "test_tag: " << tag.getValue() << ":\n";
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for (auto [index, operand] : llvm::enumerate(op->getOperands())) {
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const Liveness *liveness = livenessAnalysis.getLiveness(operand);
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assert(liveness && "expected a sparse lattice");
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os << " operand #" << index << ": ";
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liveness->print(os);
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os << "\n";
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}
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for (auto [index, operand] : llvm::enumerate(op->getResults())) {
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const Liveness *liveness = livenessAnalysis.getLiveness(operand);
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assert(liveness && "expected a sparse lattice");
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os << " result #" << index << ": ";
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liveness->print(os);
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os << "\n";
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}
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});
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}
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};
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} // end anonymous namespace
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namespace mlir {
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namespace test {
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void registerTestLivenessAnalysisPass() {
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PassRegistration<TestLivenessAnalysisPass>();
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}
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} // end namespace test
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} // end namespace mlir
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