#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"
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);
}
// 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
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;
}