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//===- StrongPhiElimination.cpp - Eliminate PHI nodes by inserting copies -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "strongphielim"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace {
class StrongPHIElimination : public MachineFunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
StrongPHIElimination() : MachineFunctionPass(ID) {
initializeStrongPHIEliminationPass(*PassRegistry::getPassRegistry());
}
virtual void getAnalysisUsage(AnalysisUsage&) const;
bool runOnMachineFunction(MachineFunction&);
};
} // namespace
char StrongPHIElimination::ID = 0;
INITIALIZE_PASS_BEGIN(StrongPHIElimination, "strong-phi-node-elimination",
"Eliminate PHI nodes for register allocation, intelligently", false, false)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
INITIALIZE_PASS_END(StrongPHIElimination, "strong-phi-node-elimination",
"Eliminate PHI nodes for register allocation, intelligently", false, false)
char &llvm::StrongPHIEliminationID = StrongPHIElimination::ID;
void StrongPHIElimination::getAnalysisUsage(AnalysisUsage& AU) const {
AU.setPreservesCFG();
AU.addRequired<MachineDominatorTree>();
AU.addRequired<SlotIndexes>();
AU.addPreserved<SlotIndexes>();
AU.addRequired<LiveIntervals>();
AU.addPreserved<LiveIntervals>();
MachineFunctionPass::getAnalysisUsage(AU);
}
bool StrongPHIElimination::runOnMachineFunction(MachineFunction& Fn) {
llvm_unreachable("Strong phi elimination is not implemented");
}
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