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[allocbox-to-stack] Improve comments. NFC.

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Swift SVN r12819
This commit is contained in:
Michael Gottesman
2014-01-22 23:59:02 +00:00
parent 51720fad4a
commit ff68b1341e
1 changed files with 7 additions and 4 deletions
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11
lib/SILPasses/AllocBoxToStack.cpp
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@@ -45,21 +45,24 @@ static bool checkForEntryCycles(SILInstruction *ABI, SILInstruction *SRI) {
while (!Worklist.empty()) {
auto *BB = Worklist.pop_back_val();
// Otherwise, add the successors of the BB to the worklist...
// Add the successors of the BB to the worklist...
for (auto &Succ : BB->getSuccs()) {
auto *BB = Succ.getBB();
// We found an entry cycle, we can not promote this alloc box.
// If one of those successors is AllocBoxBB, we have an entry cycle
// implying that we can not promote this alloc box.
if (BB == AllocBoxBB) {
++NumEntryCycleBB;
return true;
}
// Prune the search at the SRI's BB.
// If the successor is the ReleaseBB, skip it since ReleaseBB
// post-dominates Prune the search at the SRI's BB.
if (BB == ReleaseBB)
continue;
// Only visit a BB once.
// Otherwise, if we have not visited the BB yet, add it to the worklist
// for processing.
if (VisitedBBSet.insert(BB))
Worklist.push_back(BB);
}