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Rename registers that do not need copies.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45759 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -44,6 +44,7 @@ namespace {
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std::map<unsigned, std::vector<unsigned> > Stacks;
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std::set<unsigned> UsedByAnother;
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std::map<unsigned, std::set<unsigned> > RenameSets;
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bool runOnMachineFunction(MachineFunction &Fn);
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@ -442,7 +443,8 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
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}
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}
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// FIXME: Cache renaming information
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// Cache renaming information
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RenameSets.insert(std::make_pair(P->getOperand(0).getReg(), PHIUnion));
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ProcessedNames.insert(PHIUnion.begin(), PHIUnion.end());
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++P;
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@ -649,8 +651,22 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
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// FIXME: This process should probably preserve LiveVariables
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InsertCopies(Fn.begin());
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// FIXME: Perform renaming
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// FIXME: Remove Phi instrs
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// Perform renaming
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typedef std::map<unsigned, std::set<unsigned> > RenameSetType;
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for (RenameSetType::iterator I = RenameSets.begin(), E = RenameSets.end();
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I != E; ++I)
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for (std::set<unsigned>::iterator SI = I->second.begin(),
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SE = I->second.end(); SI != SE; ++SI)
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Fn.getRegInfo().replaceRegWith(*SI, I->first);
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// FIXME: Insert last-minute copies
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// Remove PHIs
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for (MachineFunction::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
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for (MachineBasicBlock::iterator BI = I->begin(), BE = I->end();
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BI != BE; ++BI)
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if (BI->getOpcode() == TargetInstrInfo::PHI)
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BI->eraseFromParent();
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return false;
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}
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