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Make sure we aren't deleting the landingpad instruction.

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The landingpad instruction is required in the landing pad block. Because we're
not deleting terminating instructions, the invoke may still jump to here (see
Transforms/SCCP/2004-11-16-DeadInvoke.ll). Remove all uses of the landingpad
instruction, but keep it around until code-gen can remove the basic block.

llvm-svn: 138890
This commit is contained in:
Bill Wendling 2011-08-31 20:55:20 +00:00
parent 4024b91dbe
commit df24e0d185
1 changed files with 21 additions and 5 deletions
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22
lib/Transforms/Scalar/SCCP.cpp
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@ -1682,14 +1682,30 @@ static void DeleteInstructionInBlock(BasicBlock *BB) {
DEBUG(dbgs() << " BasicBlock Dead:" << *BB);
++NumDeadBlocks;
// Check to see if there are non-terminating instructions to delete.
if (isa<TerminatorInst>(BB->begin()))
return;
// Delete the instructions backwards, as it has a reduced likelihood of
// having to update as many def-use and use-def chains.
while (!isa<TerminatorInst>(BB->begin())) {
Instruction *I = --BasicBlock::iterator(BB->getTerminator());
std::vector<Instruction*> WorkList;
WorkList.reserve(BB->size());
BasicBlock::iterator I = --BasicBlock::iterator(BB->getTerminator());
while (true) {
if (!I->use_empty())
I->replaceAllUsesWith(UndefValue::get(I->getType()));
BB->getInstList().erase(I);
WorkList.push_back(I);
if (I == BB->begin())
break;
--I;
}
for (std::vector<Instruction*>::iterator
II = WorkList.begin(), IE = WorkList.end(); II != IE; ++II) {
if (isa<LandingPadInst>(*II))
continue;
BB->getInstList().erase(*II);
++NumInstRemoved;
}
}