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After trivial coalescing, the MI being visited may have become a copy. Avoid adding it to CSE hash table since copies aren't being considered for CSE and they may be deleted.

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rdar://7819990


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-04-02 02:21:24 +00:00
parent 93d6a7e9c2
commit db8771af28
2 changed files with 75 additions and 1 deletions
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6
lib/CodeGen/MachineCSE.cpp
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@ -294,8 +294,12 @@ bool MachineCSE::ProcessBlock(MachineDomTreeNode *Node) {
bool FoundCSE = VNT.count(MI);
if (!FoundCSE) {
// Look for trivial copy coalescing opportunities.
if (PerformTrivialCoalescing(MI, MBB))
if (PerformTrivialCoalescing(MI, MBB)) {
// After coalescing MI itself may become a copy.
if (isCopy(MI, TII))
continue;
FoundCSE = VNT.count(MI);
}
}
// FIXME: commute commutable instructions?