1 //===- StrongPhiElimination.cpp - Eliminate PHI nodes by inserting copies -===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 //===----------------------------------------------------------------------===//
13 #define DEBUG_TYPE "strongphielim"
14 #include "llvm/CodeGen/Passes.h"
15 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
16 #include "llvm/CodeGen/MachineDominators.h"
17 #include "llvm/CodeGen/MachineFunctionPass.h"
18 #include "llvm/Support/ErrorHandling.h"
22 class StrongPHIElimination : public MachineFunctionPass {
24 static char ID; // Pass identification, replacement for typeid
25 StrongPHIElimination() : MachineFunctionPass(ID) {
26 initializeStrongPHIEliminationPass(*PassRegistry::getPassRegistry());
30 bool runOnMachineFunction(MachineFunction &Fn) {
31 llvm_unreachable("Strong phi elimination is not implemented");
34 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
36 AU.addRequired<MachineDominatorTree>();
37 AU.addRequired<SlotIndexes>();
38 AU.addPreserved<SlotIndexes>();
39 AU.addRequired<LiveIntervals>();
40 AU.addPreserved<LiveIntervals>();
41 MachineFunctionPass::getAnalysisUsage(AU);
46 char StrongPHIElimination::ID = 0;
47 INITIALIZE_PASS_BEGIN(StrongPHIElimination, "strong-phi-node-elimination",
48 "Eliminate PHI nodes for register allocation, intelligently", false, false)
49 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
50 INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
51 INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
52 INITIALIZE_PASS_END(StrongPHIElimination, "strong-phi-node-elimination",
53 "Eliminate PHI nodes for register allocation, intelligently", false, false)
55 char &llvm::StrongPHIEliminationID = StrongPHIElimination::ID;