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SSI construction should just go ahead and ignore instructions in unreachable

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blocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79132 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-08-15 20:12:18 +00:00
parent bf230bf5cc
commit 071d84e109
2 changed files with 25 additions and 2 deletions
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8
lib/Transforms/Utils/SSI.cpp
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@ -39,7 +39,7 @@ STATISTIC(NumPhiInserted, "Number of phi functions inserted");
void SSI::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<DominanceFrontier>();
AU.addRequired<DominatorTree>();
AU.setPreservesAll();
AU.setPreservesCFG();
}
bool SSI::runOnFunction(Function &F) {
@ -121,7 +121,7 @@ void SSI::insertPhiFunctions(SmallVectorImpl<Instruction *> &value) {
// Test if there were any sigmas for this variable
if (needConstruction[i]) {
SmallPtrSet<BasicBlock *, 1> BB_visited;
SmallPtrSet<BasicBlock *, 16> BB_visited;
// Insert phi functions if there is any sigma function
while (!defsites[i].empty()) {
@ -131,6 +131,10 @@ void SSI::insertPhiFunctions(SmallVectorImpl<Instruction *> &value) {
defsites[i].pop_back();
DominanceFrontier::iterator DF_BB = DF->find(BB);
// The BB is unreachable. Skip it.
if (DF_BB == DF->end())
continue;
// Iterates through all the dominance frontier of BB
for (std::set<BasicBlock *>::iterator DF_BB_begin =
DF_BB->second.begin(), DF_BB_end = DF_BB->second.end();