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Update MachineDominator information 

llvm-svn: 88727
This commit is contained in:
Jakob Stoklund Olesen 2009-11-14 00:38:06 +00:00
parent 2ec5dd7160
commit 15ca009ee7
1 changed files with 9 additions and 6 deletions
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15
llvm/lib/CodeGen/PHIElimination.cpp
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@ -17,7 +17,7 @@
#include "PHIElimination.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@ -49,12 +49,12 @@ const PassInfo *const llvm::PHIEliminationID = &X;
void llvm::PHIElimination::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<LiveVariables>();
AU.addPreserved<MachineDominatorTree>();
if (SplitEdges) {
AU.addRequired<LiveVariables>();
} else {
AU.setPreservesCFG();
AU.addPreservedID(MachineLoopInfoID);
AU.addPreservedID(MachineDominatorsID);
}
MachineFunctionPass::getAnalysisUsage(AU);
}
@ -297,7 +297,6 @@ void llvm::PHIElimination::LowerAtomicPHINode(
// Okay, if we now know that the value is not live out of the block, we can
// add a kill marker in this block saying that it kills the incoming value!
// When SplitEdges is enabled, the value is never live out.
if (!ValueIsUsed && !isLiveOut(SrcReg, opBlock, *LV)) {
// In our final twist, we have to decide which instruction kills the
// register. In most cases this is the copy, however, the first
@ -443,14 +442,18 @@ MachineBasicBlock *PHIElimination::SplitCriticalEdge(MachineBasicBlock *A,
SmallVector<MachineOperand, 4> Cond;
MF->getTarget().getInstrInfo()->InsertBranch(*NMBB, B, NULL, Cond);
if (LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>())
LV->addNewBlock(NMBB, A);
// 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->getOpcode() == TargetInstrInfo::PHI; ++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);
if (MachineDominatorTree *MDT=getAnalysisIfAvailable<MachineDominatorTree>())
MDT->addNewBlock(NMBB, A);
return NMBB;
}