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LiveIntervalAnalysis: Factor out code to update liveness on vreg def removal

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This cleans up code and is more in line with the general philosophy of
modifying LiveIntervals through LiveIntervalAnalysis instead of changing
them directly.

This also fixes a case where SplitEditor::removeBackCopies() would miss
the subregister ranges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-01-21 19:02:30 +00:00
parent a955eabc7b
commit 7d3ec5af28
5 changed files with 45 additions and 53 deletions
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20
lib/CodeGen/LiveRangeEdit.cpp
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@@ -273,21 +273,11 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
// Remove defined value.
if (MOI->isDef()) {
if (VNInfo *VNI = LI.getVNInfoAt(Idx)) {
if (TheDelegate)
TheDelegate->LRE_WillShrinkVirtReg(LI.reg);
LI.removeValNo(VNI);
if (LI.empty()) {
RegsToErase.push_back(Reg);
} else {
// Also remove the value in subranges.
for (LiveInterval::SubRange &S : LI.subranges()) {
if (VNInfo *SVNI = S.getVNInfoAt(Idx))
S.removeValNo(SVNI);
}
LI.removeEmptySubRanges();
}
}
if (TheDelegate && LI.getVNInfoAt(Idx) != nullptr)
TheDelegate->LRE_WillShrinkVirtReg(LI.reg);
LIS.removeVRegDefAt(LI, Idx);
if (LI.empty())
RegsToErase.push_back(Reg);
}
}