1 //===- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support -----------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// This file implements support for a bisecting optimizations based on a
11 /// command line option.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/IR/OptBisect.h"
16 #include "llvm/Pass.h"
17 #include "llvm/Support/CommandLine.h"
18 #include "llvm/Support/raw_ostream.h"
24 static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden,
25 cl::init(std::numeric_limits<int>::max()),
27 cl::desc("Maximum optimization to perform"));
29 OptBisect::OptBisect() : OptPassGate() {
30 BisectEnabled = OptBisectLimit != std::numeric_limits<int>::max();
33 static void printPassMessage(const StringRef &Name, int PassNum,
34 StringRef TargetDesc, bool Running) {
35 StringRef Status = Running ? "" : "NOT ";
36 errs() << "BISECT: " << Status << "running pass "
37 << "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n";
40 bool OptBisect::shouldRunPass(const Pass *P, StringRef IRDescription) {
41 assert(BisectEnabled);
43 return checkPass(P->getPassName(), IRDescription);
46 bool OptBisect::checkPass(const StringRef PassName,
47 const StringRef TargetDesc) {
48 assert(BisectEnabled);
50 int CurBisectNum = ++LastBisectNum;
51 bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit);
52 printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun);
56 ManagedStatic<OptBisect> llvm::OptBisector;