RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2025-01-01 09:18:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Make sure we aren't deleting the landingpad instruction.

Browse Source 
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138890 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-08-31 20:55:20 +00:00
parent 721cb1fde0
commit 4f8aaa0928
1 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1681,15 +1681,31 @@ FunctionPass *llvm::createSCCPPass() {
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;
}
}