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Avoid deleting extra copies when RegistersDefinedFromSameValue is true.

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This function adds copies to be erased to DupCopies, avoid also adding
them to DeadCopies.

llvm-svn: 157147
This commit is contained in:
Jakob Stoklund Olesen 2012-05-20 04:52:48 +00:00
parent 04202f992f
commit 72efb98f61
1 changed files with 8 additions and 7 deletions
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15
lib/CodeGen/RegisterCoalescer.cpp
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@ -1310,9 +1310,10 @@ bool RegisterCoalescer::joinIntervals(CoalescerPair &CP) {
// DstReg is known to be a register in the LHS interval. If the src is
// from the RHS interval, we can use its value #.
if (!CP.isCoalescable(MI) &&
!RegistersDefinedFromSameValue(*LIS, *TRI, CP, VNI, OtherVNI,
DupCopies))
if (CP.isCoalescable(MI))
DeadCopies.push_back(MI);
else if (!RegistersDefinedFromSameValue(*LIS, *TRI, CP, VNI, OtherVNI,
DupCopies))
continue;
LHSValsDefinedFromRHS[VNI] = OtherVNI;
@ -1339,13 +1340,13 @@ bool RegisterCoalescer::joinIntervals(CoalescerPair &CP) {
// DstReg is known to be a register in the RHS interval. If the src is
// from the LHS interval, we can use its value #.
if (!CP.isCoalescable(MI) &&
!RegistersDefinedFromSameValue(*LIS, *TRI, CP, VNI, OtherVNI,
DupCopies))
if (CP.isCoalescable(MI))
DeadCopies.push_back(MI);
else if (!RegistersDefinedFromSameValue(*LIS, *TRI, CP, VNI, OtherVNI,
DupCopies))
continue;
RHSValsDefinedFromLHS[VNI] = OtherVNI;
DeadCopies.push_back(MI);
}
LHSValNoAssignments.resize(LHS.getNumValNums(), -1);