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Don't eliminate blocks that are only reachable by unwind_to.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48106 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2008-03-09 08:50:23 +00:00
parent 02b6d25a27
commit 9143699260
1 changed files with 8 additions and 2 deletions
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10
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10796,11 +10796,15 @@ static void AddReachableCodeToWorklist(BasicBlock *BB,
// Recursively visit successors. If this is a branch or switch on a
// constant, only visit the reachable successor.
if (BB->getUnwindDest())
Worklist.push_back(BB->getUnwindDest());
TerminatorInst *TI = BB->getTerminator();
if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
if (BI->isConditional() && isa<ConstantInt>(BI->getCondition())) {
bool CondVal = cast<ConstantInt>(BI->getCondition())->getZExtValue();
Worklist.push_back(BI->getSuccessor(!CondVal));
BasicBlock *ReachableBB = BI->getSuccessor(!CondVal);
if (ReachableBB != BB->getUnwindDest())
Worklist.push_back(ReachableBB);
continue;
}
} else if (SwitchInst *SI = dyn_cast<SwitchInst>(TI)) {
@ -10808,7 +10812,9 @@ static void AddReachableCodeToWorklist(BasicBlock *BB,
// See if this is an explicit destination.
for (unsigned i = 1, e = SI->getNumSuccessors(); i != e; ++i)
if (SI->getCaseValue(i) == Cond) {
Worklist.push_back(SI->getSuccessor(i));
BasicBlock *ReachableBB = SI->getSuccessor(i);
if (ReachableBB != BB->getUnwindDest())
Worklist.push_back(ReachableBB);
continue;
}