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When extending a liveinterval by commuting, don't throw away the live ranges that are not affected.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52430 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-06-17 20:11:16 +00:00
parent 8d6a58c5d5
commit 739583be56
1 changed files with 13 additions and 2 deletions
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15
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -381,10 +381,21 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
// simply extend BLR if CopyMI doesn't end the range.
DOUT << "\nExtending: "; IntB.print(DOUT, tri_);
IntB.removeValNo(BValNo);
// Remove val#'s defined by copies that will be coalesced away.
for (unsigned i = 0, e = BDeadValNos.size(); i != e; ++i)
IntB.removeValNo(BDeadValNos[i]);
VNInfo *ValNo = IntB.getNextValue(AValNo->def, 0, li_->getVNInfoAllocator());
// Extend BValNo by merging in IntA live ranges of AValNo. Val# definition
// is updated. Kills are also updated.
VNInfo *ValNo = BValNo;
ValNo->def = AValNo->def;
ValNo->copy = NULL;
for (unsigned j = 0, ee = ValNo->kills.size(); j != ee; ++j) {
unsigned Kill = ValNo->kills[j];
if (Kill != BLR->end)
BKills.push_back(Kill);
}
ValNo->kills.clear();
for (LiveInterval::iterator AI = IntA.begin(), AE = IntA.end();
AI != AE; ++AI) {
if (AI->valno != AValNo) continue;