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Tell the register allocator about new unused virtual registers.

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This allows the allocator to free any resources used by the virtual register,
including physical register assignments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-13 01:23:11 +00:00
parent b56130f96b
commit 7792e980c4
4 changed files with 26 additions and 1 deletions
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lib/CodeGen/LiveRangeEdit.cpp
+5
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@@ -131,6 +131,11 @@ SlotIndex LiveRangeEdit::rematerializeAt(MachineBasicBlock &MBB,
return lis.InsertMachineInstrInMaps(--MI).getDefIndex();
}
void LiveRangeEdit::eraseVirtReg(unsigned Reg, LiveIntervals &LIS) {
if (delegate_ && delegate_->LRE_CanEraseVirtReg(Reg))
LIS.removeInterval(Reg);
}
void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
LiveIntervals &LIS,
const TargetInstrInfo &TII) {