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Terminate all dead defs at the dead slot instead of the 'next' slot.

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This makes no difference for normal defs, but early clobber dead defs
now look like:

  [Slot_EarlyClobber; Slot_Dead)

instead of:

  [Slot_EarlyClobber; Slot_Register).

Live ranges for normal dead defs look like:

  [Slot_Register; Slot_Dead)

as before.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144512 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-11-13 22:42:13 +00:00
parent f9fd29ea34
commit 1f81e316b0
3 changed files with 8 additions and 8 deletions
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2
lib/CodeGen/InlineSpiller.cpp
View File

@ -1206,7 +1206,7 @@ void InlineSpiller::spillAroundUses(unsigned Reg) {
// This instruction defines a dead value. We don't need to spill it,
// but do create a live range for the dead value.
VNInfo *VNI = NewLI.getNextValue(Idx, 0, LIS.getVNInfoAllocator());
NewLI.addRange(LiveRange(Idx, Idx.getNextSlot(), VNI));
NewLI.addRange(LiveRange(Idx, Idx.getDeadSlot(), VNI));
}
}

4
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -686,7 +686,7 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
VNInfo *VNI = *I;
if (VNI->isUnused())
continue;
NewLI.addRange(LiveRange(VNI->def, VNI->def.getNextSlot(), VNI));
NewLI.addRange(LiveRange(VNI->def, VNI->def.getDeadSlot(), VNI));
// A use tied to an early-clobber def ends at the load slot and isn't caught
// above. Catch it here instead. This probably only ever happens for inline
@ -751,7 +751,7 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
continue;
LiveInterval::iterator LII = NewLI.FindLiveRangeContaining(VNI->def);
assert(LII != NewLI.end() && "Missing live range for PHI");
if (LII->end != VNI->def.getNextSlot())
if (LII->end != VNI->def.getDeadSlot())
continue;
if (VNI->isPHIDef()) {
// This is a dead PHI. Remove it.

10
lib/CodeGen/SplitKit.cpp
View File

@ -366,14 +366,14 @@ VNInfo *SplitEditor::defValue(unsigned RegIdx,
// If the previous value was a simple mapping, add liveness for it now.
if (VNInfo *OldVNI = InsP.first->second.getPointer()) {
SlotIndex Def = OldVNI->def;
LI->addRange(LiveRange(Def, Def.getNextSlot(), OldVNI));
LI->addRange(LiveRange(Def, Def.getDeadSlot(), OldVNI));
// No longer a simple mapping. Switch to a complex, non-forced mapping.
InsP.first->second = ValueForcePair();
}
// This is a complex mapping, add liveness for VNI
SlotIndex Def = VNI->def;
LI->addRange(LiveRange(Def, Def.getNextSlot(), VNI));
LI->addRange(LiveRange(Def, Def.getDeadSlot(), VNI));
return VNI;
}
@ -393,7 +393,7 @@ void SplitEditor::forceRecompute(unsigned RegIdx, const VNInfo *ParentVNI) {
// This was previously a single mapping. Make sure the old def is represented
// by a trivial live range.
SlotIndex Def = VNI->def;
Edit->get(RegIdx)->addRange(LiveRange(Def, Def.getNextSlot(), VNI));
Edit->get(RegIdx)->addRange(LiveRange(Def, Def.getDeadSlot(), VNI));
// Mark as complex mapped, forced.
VFP = ValueForcePair(0, true);
}
@ -994,8 +994,8 @@ void SplitEditor::deleteRematVictims() {
LiveInterval *LI = *I;
for (LiveInterval::const_iterator LII = LI->begin(), LIE = LI->end();
LII != LIE; ++LII) {
// Dead defs end at the store slot.
if (LII->end != LII->valno->def.getNextSlot())
// Dead defs end at the dead slot.
if (LII->end != LII->valno->def.getDeadSlot())
continue;
MachineInstr *MI = LIS.getInstructionFromIndex(LII->valno->def);
assert(MI && "Missing instruction for dead def");