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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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10
lib/CodeGen/SplitKit.cpp
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@@ -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");