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Re-apply r80926, with fixes: keep the domtree informed of new blocks

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that get created during loop unswitching, and fix SplitBlockPredecessors'
LCSSA updating code to create new PHIs instead of trying to just move
existing ones.

Also, optimize Loop::verifyLoop, since it gets called a lot. Use
searches on a sorted list of blocks instead of calling the "contains"
function, as is done in other places in the Loop class, since "contains"
does a linear search. Also, don't call verifyLoop from LoopSimplify or
LCSSA, as the PassManager is already calling verifyLoop as part of
LoopInfo's verifyAnalysis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-08 15:45:00 +00:00
parent 6ca0b9e722
commit 5c89b5240c
12 changed files with 959 additions and 197 deletions
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10
lib/Analysis/LoopInfo.cpp
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@ -300,6 +300,9 @@ bool Loop::isLoopSimplifyForm() const {
///
void
Loop::getUniqueExitBlocks(SmallVectorImpl<BasicBlock *> &ExitBlocks) const {
assert(isLoopSimplifyForm() &&
"getUniqueExitBlocks assumes the loop is in canonical form!");
// Sort the blocks vector so that we can use binary search to do quick
// lookups.
SmallVector<BasicBlock *, 128> LoopBBs(block_begin(), block_end());
@ -371,6 +374,13 @@ bool LoopInfo::runOnFunction(Function &) {
return false;
}
void LoopInfo::verifyAnalysis() const {
for (iterator I = begin(), E = end(); I != E; ++I) {
assert(!(*I)->getParentLoop() && "Top-level loop has a parent!");
(*I)->verifyLoopNest();
}
}
void LoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<DominatorTree>();