mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-15 09:51:00 +00:00
c1f3d6cc06
Summary: This patch implements Machine PostDominator Tree verification and ensures that the verification doesn't fail the in-tree tests. MPDT verification can be enabled using `verify-machine-dom-info` -- the same flag used by Machine Dominator Tree verification. Flipping the flag revealed that MachineSink falsely claimed to preserve CFG and MDT/MPDT. This patch fixes that. Reviewers: arsenm, hliao, rampitec, vpykhtin, grosser Reviewed By: hliao Subscribers: wdng, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68235 llvm-svn: 373341
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
//===- MachinePostDominators.cpp -Machine Post Dominator Calculation ------===//
|
|
//
|
|
// 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 simple dominator construction algorithms for finding
|
|
// post dominators on machine functions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/MachinePostDominators.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace llvm {
|
|
template class DominatorTreeBase<MachineBasicBlock, true>; // PostDomTreeBase
|
|
|
|
extern bool VerifyMachineDomInfo;
|
|
} // namespace llvm
|
|
|
|
char MachinePostDominatorTree::ID = 0;
|
|
|
|
//declare initializeMachinePostDominatorTreePass
|
|
INITIALIZE_PASS(MachinePostDominatorTree, "machinepostdomtree",
|
|
"MachinePostDominator Tree Construction", true, true)
|
|
|
|
MachinePostDominatorTree::MachinePostDominatorTree()
|
|
: MachineFunctionPass(ID), PDT(nullptr) {
|
|
initializeMachinePostDominatorTreePass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
FunctionPass *MachinePostDominatorTree::createMachinePostDominatorTreePass() {
|
|
return new MachinePostDominatorTree();
|
|
}
|
|
|
|
bool MachinePostDominatorTree::runOnMachineFunction(MachineFunction &F) {
|
|
PDT = std::make_unique<PostDomTreeT>();
|
|
PDT->recalculate(F);
|
|
return false;
|
|
}
|
|
|
|
void MachinePostDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
|
}
|
|
|
|
MachineBasicBlock *MachinePostDominatorTree::findNearestCommonDominator(
|
|
ArrayRef<MachineBasicBlock *> Blocks) const {
|
|
assert(!Blocks.empty());
|
|
|
|
MachineBasicBlock *NCD = Blocks.front();
|
|
for (MachineBasicBlock *BB : Blocks.drop_front()) {
|
|
NCD = PDT->findNearestCommonDominator(NCD, BB);
|
|
|
|
// Stop when the root is reached.
|
|
if (PDT->isVirtualRoot(PDT->getNode(NCD)))
|
|
return nullptr;
|
|
}
|
|
|
|
return NCD;
|
|
}
|
|
|
|
void MachinePostDominatorTree::verifyAnalysis() const {
|
|
if (PDT && VerifyMachineDomInfo)
|
|
if (!PDT->verify(PostDomTreeT::VerificationLevel::Basic)) {
|
|
errs() << "MachinePostDominatorTree verification failed\n";
|
|
|
|
abort();
|
|
}
|
|
}
|
|
|
|
void MachinePostDominatorTree::print(llvm::raw_ostream &OS,
|
|
const Module *M) const {
|
|
PDT->print(OS);
|
|
}
|