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During branch folding avoid inserting redundant DBG_VALUE machine instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132148 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-05-26 21:47:59 +00:00
parent 33458fedb6
commit 785badb83e
2 changed files with 105 additions and 0 deletions
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13
lib/CodeGen/BranchFolding.cpp
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@ -1056,6 +1056,19 @@ ReoptimizeBlock:
!MBB->hasAddressTaken() && !MBB->isLandingPad()) {
DEBUG(dbgs() << "\nMerging into block: " << PrevBB
<< "From MBB: " << *MBB);
if (PrevBB.begin() != PrevBB.end()) {
MachineBasicBlock::iterator PrevBBIter = PrevBB.end();
--PrevBBIter;
MachineBasicBlock::iterator MBBIter = MBB->begin();
while (PrevBBIter != PrevBB.begin() && MBBIter != MBB->end()
&& PrevBBIter->isDebugValue() && MBBIter->isDebugValue()) {
if (!MBBIter->isIdenticalTo(PrevBBIter))
break;
MachineInstr *DuplicateDbg = MBBIter;
++MBBIter; -- PrevBBIter;
DuplicateDbg->eraseFromParent();
}
}
PrevBB.splice(PrevBB.end(), MBB, MBB->begin(), MBB->end());
PrevBB.removeSuccessor(PrevBB.succ_begin());;
assert(PrevBB.succ_empty());