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Avoid recursion. 

llvm-svn: 36272
This commit is contained in:
Devang Patel 2007-04-20 20:04:37 +00:00
parent 2da606c757
commit 83a3adcc3f
1 changed files with 13 additions and 6 deletions
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19
llvm/lib/Transforms/Utils/LoopSimplify.cpp
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@ -407,13 +407,20 @@ BasicBlock *LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
/// AddBlockAndPredsToSet - Add the specified block, and all of its
/// predecessors, to the specified set, if it's not already in there. Stop
/// predecessor traversal when we reach StopBlock.
static void AddBlockAndPredsToSet(BasicBlock *BB, BasicBlock *StopBlock,
static void AddBlockAndPredsToSet(BasicBlock *InputBB, BasicBlock *StopBlock,
std::set<BasicBlock*> &Blocks) {
if (!Blocks.insert(BB).second) return; // already processed.
if (BB == StopBlock) return; // Stop here!
for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I)
AddBlockAndPredsToSet(*I, StopBlock, Blocks);
std::vector<BasicBlock *> WorkList;
WorkList.push_back(InputBB);
do {
BasicBlock *BB = WorkList.back(); WorkList.pop_back();
if (Blocks.insert(BB).second && BB != StopBlock)
// If BB is not already processed and it is not a stop block then
// insert its predecessor in the work list
for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I) {
BasicBlock *WBB = *I;
WorkList.push_back(WBB);
}
} while(!WorkList.empty());
}
/// FindPHIToPartitionLoops - The first part of loop-nestification is to find a