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add a method

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llvm-svn: 31249
This commit is contained in:
Chris Lattner 2006-10-28 01:24:05 +00:00
parent 93414d06c4
commit 44b3550217
2 changed files with 26 additions and 0 deletions
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6
include/llvm/Analysis/LoopInfo.h
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@ -107,6 +107,12 @@ public:
// induction variable canonicalization pass should be used to normalize loops
// for easy analysis. These methods assume canonical loops.
/// getExitingBlocks - Return all blocks inside the loop that have successors
/// outside of the loop. These are the blocks _inside of the current loop_
/// which branch out. The returned list is always unique.
///
void getExitingBlocks(std::vector<BasicBlock*> &Blocks) const;
/// getExitBlocks - Return all of the successor blocks of this loop. These
/// are the blocks _outside of the current loop_ which are branched to.
///

20
lib/Analysis/LoopInfo.cpp
View File

@ -332,6 +332,26 @@ void LoopInfo::removeBlock(BasicBlock *BB) {
// APIs for simple analysis of the loop.
//
/// getExitingBlocks - Return all blocks inside the loop that have successors
/// outside of the loop. These are the blocks _inside of the current loop_
/// which branch out. The returned list is always unique.
///
void Loop::getExitingBlocks(std::vector<BasicBlock*> &ExitingBlocks) const {
// Sort the blocks vector so that we can use binary search to do quick
// lookups.
std::vector<BasicBlock*> LoopBBs(block_begin(), block_end());
std::sort(LoopBBs.begin(), LoopBBs.end());
for (std::vector<BasicBlock*>::const_iterator BI = Blocks.begin(),
BE = Blocks.end(); BI != BE; ++BI)
for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I)
if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I)) {
// Not in current loop? It must be an exit block.
ExitingBlocks.push_back(*BI);
break;
}
}
/// getExitBlocks - Return all of the successor blocks of this loop. These
/// are the blocks _outside of the current loop_ which are branched to.
///