Imported Upstream version 5.18.0.234

Former-commit-id: 8071ec1a8c5eaa9be24b41745add19297608001f

external/llvm/lib/CodeGen/TailDuplication.cpp

@@ -1,72 +0,0 @@
-//===- TailDuplication.cpp - Duplicate blocks into predecessors' tails ----===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass duplicates basic blocks ending in unconditional branches into
-// the tails of their predecessors, using the TailDuplicator utility class.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/Passes.h"
-#include "llvm/CodeGen/TailDuplicator.h"
-#include "llvm/Pass.h"
-
-using namespace llvm;
-
-#define DEBUG_TYPE "tailduplication"
-
-namespace {
-
-/// Perform tail duplication. Delegates to TailDuplicator
-class TailDuplicatePass : public MachineFunctionPass {
-  TailDuplicator Duplicator;
-
-public:
-  static char ID;
-
-  explicit TailDuplicatePass() : MachineFunctionPass(ID) {}
-
-  bool runOnMachineFunction(MachineFunction &MF) override;
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override;
-};
-
-} // end anonymous namespace
-
-char TailDuplicatePass::ID = 0;
-
-char &llvm::TailDuplicateID = TailDuplicatePass::ID;
-
-INITIALIZE_PASS(TailDuplicatePass, DEBUG_TYPE, "Tail Duplication", false, false)
-
-bool TailDuplicatePass::runOnMachineFunction(MachineFunction &MF) {
-  if (skipFunction(MF.getFunction()))
-    return false;
-
-  auto MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
-
-  // TODO: Querying isSSA() to determine pre-/post-regalloc is fragile, better
-  // split this into two passes instead.
-  bool PreRegAlloc = MF.getRegInfo().isSSA();
-  Duplicator.initMF(MF, PreRegAlloc, MBPI, /* LayoutMode */ false);
-
-  bool MadeChange = false;
-  while (Duplicator.tailDuplicateBlocks())
-    MadeChange = true;
-
-  return MadeChange;
-}
-
-void TailDuplicatePass::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.addRequired<MachineBranchProbabilityInfo>();
-  MachineFunctionPass::getAnalysisUsage(AU);
-}