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[LoopDeletion] Add an assert that verifies LCSSA 

This is inspired by PR24804 -- had this assert been there before,
isolating the root cause for PR24804 would have been far easier.

llvm-svn: 261481
This commit is contained in:
Sanjoy Das 2016-02-21 17:11:59 +00:00
parent 6e135f45a8
commit 979a11d5b2
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Transforms/Scalar/LoopDeletion.cpp
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@ -122,6 +122,9 @@ bool LoopDeletion::runOnLoop(Loop *L, LPPassManager &) {
if (skipOptnoneFunction(L))
return false;
DominatorTree &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
assert(L->isLCSSAForm(DT) && "Expected LCSSA!");
// We can only remove the loop if there is a preheader that we can
// branch from after removing it.
BasicBlock *preheader = L->getLoopPreheader();
@ -194,7 +197,6 @@ bool LoopDeletion::runOnLoop(Loop *L, LPPassManager &) {
// Update the dominator tree and remove the instructions and blocks that will
// be deleted from the reference counting scheme.
DominatorTree &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
SmallVector<DomTreeNode*, 8> ChildNodes;
for (Loop::block_iterator LI = L->block_begin(), LE = L->block_end();
LI != LE; ++LI) {