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[CodeGen] Introduce MI flag for Live Range split instructions #117543

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[CodeGen] Introduce MI flag for Live Range split instructions #117543

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3 changes: 2 additions & 1 deletion llvm/include/llvm/CodeGen/MachineInstr.h
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Original file line number Diff line number Diff line change
Expand Up @@ -123,8 +123,9 @@ class MachineInstr
NoUSWrap = 1 << 20, // Instruction supports geps
// no unsigned signed wrap.
SameSign = 1 << 21, // Both operands have the same sign.
InBounds = 1 << 22 // Pointer arithmetic remains inbounds.
InBounds = 1 << 22, // Pointer arithmetic remains inbounds.
// Implies NoUSWrap.
LRSplit = 1 << 23 // Instruction for live range split.
};

private:
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2 changes: 2 additions & 0 deletions llvm/lib/CodeGen/SplitKit.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -531,6 +531,7 @@ SlotIndex SplitEditor::buildSingleSubRegCopy(
| getInternalReadRegState(!FirstCopy), SubIdx)
.addReg(FromReg, 0, SubIdx);

CopyMI->setFlag(MachineInstr::LRSplit);
SlotIndexes &Indexes = *LIS.getSlotIndexes();
if (FirstCopy) {
Def = Indexes.insertMachineInstrInMaps(*CopyMI, Late).getRegSlot();
Expand All @@ -550,6 +551,7 @@ SlotIndex SplitEditor::buildCopy(Register FromReg, Register ToReg,
// The full vreg is copied.
MachineInstr *CopyMI =
BuildMI(MBB, InsertBefore, DebugLoc(), Desc, ToReg).addReg(FromReg);
CopyMI->setFlag(MachineInstr::LRSplit);
return Indexes.insertMachineInstrInMaps(*CopyMI, Late).getRegSlot();
}

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