mirror of https://github.com/llvm/torch-mlir
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===- DeleteDeadIREELists.cpp -----------------------------------*- C++-*-===//
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//
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// This file is licensed 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 "iree-dialects/Dialect/IREE/IREEOps.h"
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#include "mlir/IR/Builders.h"
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#include "mlir/IR/BuiltinOps.h"
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#include "npcomp/Backend/Common/Passes.h"
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using namespace mlir;
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using namespace mlir::NPCOMP;
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using namespace mlir::NPCOMP::CommonBackend;
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namespace {
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class DeleteDeadIREEListsPass
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: public DeleteDeadIREEListsBase<DeleteDeadIREEListsPass> {
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void runOnOperation() override {
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SmallVector<Operation *> toErase;
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// Delete lists that are only set (but not read from).
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// This is created by our lowering for torch.prim.ListConstruct.
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// Until IREE can run such ops e2e (or delete them itself), we need to
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// do this cleanup.
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// TODO: Add support to IREE to run these ops E2E.
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getOperation().walk([&](iree::ListCreateOp op) {
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SmallVector<Operation *> deadOps;
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deadOps.push_back(op);
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for (auto &use : op.getResult().getUses()) {
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if (isa<iree::ListSetOp, iree::ListResizeOp>(use.getOwner())) {
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deadOps.push_back(use.getOwner());
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} else {
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// We can't analyze the list op if it is used by something else.
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return;
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}
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}
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llvm::append_range(toErase, deadOps);
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});
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for (auto *op : toErase) {
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op->dropAllDefinedValueUses();
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op->erase();
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}
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}
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};
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} // namespace
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std::unique_ptr<OperationPass<FuncOp>>
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mlir::NPCOMP::CommonBackend::createDeleteDeadIREEListsPass() {
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return std::make_unique<DeleteDeadIREEListsPass>();
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}
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