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Eliminate the VNInfo::hasPHIKill() flag.

Browse Source 
The only real user of the flag was removeCopyByCommutingDef(), and it
has been switched to LiveIntervals::hasPHIKill().

All the code changed by this patch was only concerned with computing and
propagating the flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161255 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-03 20:19:44 +00:00
parent 0ab7103e06
commit bf60aa9db5
5 changed files with 3 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/llvm/CodeGen/LiveInterval.h
View File

@ -42,8 +42,7 @@ namespace llvm {
class VNInfo {
private:
enum {
HAS_PHI_KILL = 1,
IS_UNUSED = 1 << 1
IS_UNUSED = 1
};
unsigned char flags;
@ -82,17 +81,6 @@ namespace llvm {
flags = (flags | VNI->flags) & ~IS_UNUSED;
}
/// Returns true if one or more kills are PHI nodes.
/// Obsolete, do not use!
bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
/// Set the PHI kill flag on this value.
void setHasPHIKill(bool hasKill) {
if (hasKill)
flags |= HAS_PHI_KILL;
else
flags &= ~HAS_PHI_KILL;
}
/// Returns true if this value is defined by a PHI instruction (or was,
/// PHI instrucions may have been eliminated).
/// PHI-defs begin at a block boundary, all other defs begin at register or

4
lib/CodeGen/LiveInterval.cpp
View File

@ -737,9 +737,7 @@ void LiveInterval::print(raw_ostream &OS) const {
} else {
OS << vni->def;
if (vni->isPHIDef())
OS << "-phidef";
if (vni->hasPHIKill())
OS << "-phikill";
OS << "-phi";
}
}
}

3
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -256,7 +256,6 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// new valno in the killing blocks.
assert(vi.AliveBlocks.empty() && "Phi join can't pass through blocks");
DEBUG(dbgs() << " phi-join");
ValNo->setHasPHIKill(true);
} else {
// Iterate over all of the blocks that the variable is completely
// live in, adding [insrtIndex(begin), instrIndex(end)+4) to the
@ -357,7 +356,6 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
SlotIndex killIndex = getMBBEndIdx(mbb);
LiveRange LR(defIndex, killIndex, ValNo);
interval.addRange(LR);
ValNo->setHasPHIKill(true);
DEBUG(dbgs() << " phi-join +" << LR);
} else {
llvm_unreachable("Multiply defined register");
@ -823,7 +821,6 @@ LiveRange LiveIntervals::addLiveRangeToEndOfBlock(unsigned reg,
VNInfo* VN = Interval.getNextValue(
SlotIndex(getInstructionIndex(startInst).getRegSlot()),
getVNInfoAllocator());
VN->setHasPHIKill(true);
LiveRange LR(
SlotIndex(getInstructionIndex(startInst).getRegSlot()),
getMBBEndIdx(startInst->getParent()), VN);

26
lib/CodeGen/RegisterCoalescer.cpp
View File

@ -460,14 +460,8 @@ bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP,
IntB.addRange(LiveRange(FillerStart, FillerEnd, BValNo));
// Okay, merge "B1" into the same value number as "B0".
if (BValNo != ValLR->valno) {
// If B1 is killed by a PHI, then the merged live range must also be killed
// by the same PHI, as B0 and B1 can not overlap.
bool HasPHIKill = BValNo->hasPHIKill();
if (BValNo != ValLR->valno)
IntB.MergeValueNumberInto(BValNo, ValLR->valno);
if (HasPHIKill)
ValLR->valno->setHasPHIKill(true);
}
DEBUG(dbgs() << " result = " << IntB << '\n');
// If the source instruction was killing the source register before the
@ -1386,24 +1380,6 @@ bool RegisterCoalescer::joinIntervals(CoalescerPair &CP) {
++J;
}
// Update kill info. Some live ranges are extended due to copy coalescing.
for (DenseMap<VNInfo*, VNInfo*>::iterator I = LHSValsDefinedFromRHS.begin(),
E = LHSValsDefinedFromRHS.end(); I != E; ++I) {
VNInfo *VNI = I->first;
unsigned LHSValID = LHSValNoAssignments[VNI->id];
if (VNI->hasPHIKill())
NewVNInfo[LHSValID]->setHasPHIKill(true);
}
// Update kill info. Some live ranges are extended due to copy coalescing.
for (DenseMap<VNInfo*, VNInfo*>::iterator I = RHSValsDefinedFromLHS.begin(),
E = RHSValsDefinedFromLHS.end(); I != E; ++I) {
VNInfo *VNI = I->first;
unsigned RHSValID = RHSValNoAssignments[VNI->id];
if (VNI->hasPHIKill())
NewVNInfo[RHSValID]->setHasPHIKill(true);
}
// Clear kill flags where live ranges are extended.
while (!LHSOldKills.empty())
LHSOldKills.pop_back_val()->clearRegisterKills(LHS.reg, TRI);

1
lib/CodeGen/StrongPHIElimination.cpp
View File

@ -673,7 +673,6 @@ void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
SlotIndex PredIndex = LI->getMBBEndIdx(PredBB);
VNInfo *SrcVNI = SrcInterval.getVNInfoBefore(PredIndex);
assert(SrcVNI);
SrcVNI->setHasPHIKill(true);
continue;
}