| //===- ReduceArguments.cpp - Specialized Delta Pass -----------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements a function which calls the Generic Delta pass in order |
| // to reduce uninteresting Arguments from defined functions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ReduceInstructions.h" |
| |
| using namespace llvm; |
| |
| /// Removes out-of-chunk arguments from functions, and modifies their calls |
| /// accordingly. It also removes allocations of out-of-chunk arguments. |
| static void extractInstrFromModule(Oracle &O, Module &Program) { |
| std::vector<Instruction *> InitInstToKeep; |
| |
| for (auto &F : Program) |
| for (auto &BB : F) { |
| // Removing the terminator would make the block invalid. Only iterate over |
| // instructions before the terminator. |
| InitInstToKeep.push_back(BB.getTerminator()); |
| for (auto &Inst : make_range(BB.begin(), std::prev(BB.end()))) |
| if (O.shouldKeep()) |
| InitInstToKeep.push_back(&Inst); |
| } |
| |
| // We create a vector first, then convert it to a set, so that we don't have |
| // to pay the cost of rebalancing the set frequently if the order we insert |
| // the elements doesn't match the order they should appear inside the set. |
| std::set<Instruction *> InstToKeep(InitInstToKeep.begin(), |
| InitInstToKeep.end()); |
| |
| std::vector<Instruction *> InstToDelete; |
| for (auto &F : Program) |
| for (auto &BB : F) |
| for (auto &Inst : BB) |
| if (!InstToKeep.count(&Inst)) { |
| Inst.replaceAllUsesWith(UndefValue::get(Inst.getType())); |
| InstToDelete.push_back(&Inst); |
| } |
| |
| for (auto &I : InstToDelete) |
| I->eraseFromParent(); |
| } |
| |
| void llvm::reduceInstructionsDeltaPass(TestRunner &Test) { |
| outs() << "*** Reducing Instructions...\n"; |
| runDeltaPass(Test, extractInstrFromModule); |
| } |