| //===- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support -----------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| /// \file |
| /// This file implements support for a bisecting optimizations based on a |
| /// command line option. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/IR/OptBisect.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cassert> |
| #include <limits> |
| |
| using namespace llvm; |
| |
| static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden, |
| cl::init(OptBisect::Disabled), cl::Optional, |
| cl::cb<void, int>([](int Limit) { |
| llvm::OptBisector->setLimit(Limit); |
| }), |
| cl::desc("Maximum optimization to perform")); |
| |
| static void printPassMessage(const StringRef &Name, int PassNum, |
| StringRef TargetDesc, bool Running) { |
| StringRef Status = Running ? "" : "NOT "; |
| errs() << "BISECT: " << Status << "running pass " |
| << "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n"; |
| } |
| |
| bool OptBisect::shouldRunPass(const Pass *P, StringRef IRDescription) { |
| assert(isEnabled()); |
| |
| return checkPass(P->getPassName(), IRDescription); |
| } |
| |
| bool OptBisect::checkPass(const StringRef PassName, |
| const StringRef TargetDesc) { |
| assert(isEnabled()); |
| |
| int CurBisectNum = ++LastBisectNum; |
| bool ShouldRun = (BisectLimit == -1 || CurBisectNum <= BisectLimit); |
| printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun); |
| return ShouldRun; |
| } |
| |
| const int OptBisect::Disabled; |
| |
| ManagedStatic<OptBisect> llvm::OptBisector; |