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68be956fff
The StrongPHIElimination pass did not work, and nobody has worked on it for two years. A rewrite is underway, so I am leaving this shell pass instead of deleting it completely. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120830 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
//===- StrongPhiElimination.cpp - Eliminate PHI nodes by inserting copies -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "strongphielim"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/LiveIntervalAnalysis.h"
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#include "llvm/CodeGen/MachineDominators.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class StrongPHIElimination : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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StrongPHIElimination() : MachineFunctionPass(ID) {
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initializeStrongPHIEliminationPass(*PassRegistry::getPassRegistry());
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}
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private:
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bool runOnMachineFunction(MachineFunction &Fn) {
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llvm_unreachable("Strong phi elimination is not implemented");
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesCFG();
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AU.addRequired<MachineDominatorTree>();
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AU.addRequired<SlotIndexes>();
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AU.addPreserved<SlotIndexes>();
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AU.addRequired<LiveIntervals>();
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AU.addPreserved<LiveIntervals>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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};
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} // namespace
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char StrongPHIElimination::ID = 0;
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INITIALIZE_PASS_BEGIN(StrongPHIElimination, "strong-phi-node-elimination",
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"Eliminate PHI nodes for register allocation, intelligently", false, false)
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INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
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INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
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INITIALIZE_PASS_END(StrongPHIElimination, "strong-phi-node-elimination",
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"Eliminate PHI nodes for register allocation, intelligently", false, false)
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char &llvm::StrongPHIEliminationID = StrongPHIElimination::ID;
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