diff options
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
-rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 53 |
1 files changed, 1 insertions, 52 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index 4271a142309..007d4d9611c 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -34,7 +34,6 @@ using namespace llvm; STATISTIC(NumAtomic, "Number of atomic phis lowered"); -STATISTIC(NumSplits, "Number of critical edges split on demand"); STATISTIC(NumReused, "Number of reused lowered phis"); char PHIElimination::ID = 0; @@ -391,58 +390,8 @@ bool llvm::PHIElimination::SplitPHIEdges(MachineFunction &MF, // (not considering PHI nodes). If the register is live in to this block // anyway, we would gain nothing from splitting. if (!LV.isLiveIn(Reg, MBB) && LV.isLiveOut(Reg, *PreMBB)) - SplitCriticalEdge(PreMBB, &MBB); + PreMBB->SplitCriticalEdge(&MBB, this); } } return true; } - -MachineBasicBlock *PHIElimination::SplitCriticalEdge(MachineBasicBlock *A, - MachineBasicBlock *B) { - assert(A && B && "Missing MBB end point"); - - MachineFunction *MF = A->getParent(); - DebugLoc dl; // FIXME: this is nowhere - - // We may need to update A's terminator, but we can't do that if AnalyzeBranch - // fails. If A uses a jump table, we won't touch it. - const TargetInstrInfo *TII = MF->getTarget().getInstrInfo(); - MachineBasicBlock *TBB = 0, *FBB = 0; - SmallVector<MachineOperand, 4> Cond; - if (TII->AnalyzeBranch(*A, TBB, FBB, Cond)) - return NULL; - - ++NumSplits; - - MachineBasicBlock *NMBB = MF->CreateMachineBasicBlock(); - MF->insert(llvm::next(MachineFunction::iterator(A)), NMBB); - DEBUG(dbgs() << "PHIElimination splitting critical edge:" - " BB#" << A->getNumber() - << " -- BB#" << NMBB->getNumber() - << " -- BB#" << B->getNumber() << '\n'); - - A->ReplaceUsesOfBlockWith(B, NMBB); - A->updateTerminator(); - - // Insert unconditional "jump B" instruction in NMBB if necessary. - NMBB->addSuccessor(B); - if (!NMBB->isLayoutSuccessor(B)) { - Cond.clear(); - MF->getTarget().getInstrInfo()->InsertBranch(*NMBB, B, NULL, Cond, dl); - } - - // Fix PHI nodes in B so they refer to NMBB instead of A - for (MachineBasicBlock::iterator i = B->begin(), e = B->end(); - i != e && i->isPHI(); ++i) - for (unsigned ni = 1, ne = i->getNumOperands(); ni != ne; ni += 2) - if (i->getOperand(ni+1).getMBB() == A) - i->getOperand(ni+1).setMBB(NMBB); - - if (LiveVariables *LV=getAnalysisIfAvailable<LiveVariables>()) - LV->addNewBlock(NMBB, A, B); - - if (MachineDominatorTree *MDT=getAnalysisIfAvailable<MachineDominatorTree>()) - MDT->addNewBlock(NMBB, A); - - return NMBB; -} |