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Fix for PR1444: do not create two successors to the same block. 

Temporarily, this breaks CodeGen/Generic/2006-02-12-InsertLibraryCall.ll
by exposing an unrelated latent problem; working on that.

llvm-svn: 37323
This commit is contained in:
Dale Johannesen 2007-05-24 17:39:32 +00:00
parent 8ff9ff7975
commit 1af8c870c7
1 changed files with 10 additions and 2 deletions
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12
llvm/lib/CodeGen/BranchFolding.cpp
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@ -717,12 +717,20 @@ static void ReplaceUsesOfBlockWith(MachineBasicBlock *BB,
I->getOperand(i).setMachineBasicBlock(New);
}
// Update the successor information.
// Update the successor information. If New was already a successor, just
// remove the link to Old instead of creating another one. PR 1444.
bool HadSuccessorNew = false;
std::vector<MachineBasicBlock*> Succs(BB->succ_begin(), BB->succ_end());
for (int i = Succs.size()-1; i >= 0; --i)
if (Succs[i] == New) {
HadSuccessorNew = true;
break;
}
for (int i = Succs.size()-1; i >= 0; --i)
if (Succs[i] == Old) {
BB->removeSuccessor(Old);
BB->addSuccessor(New);
if (!HadSuccessorNew)
BB->addSuccessor(New);
}
}