[llvm] r261481 - [LoopDeletion] Add an assert that verifies LCSSA
Sanjoy Das via llvm-commits
llvm-commits at lists.llvm.org
Sun Feb 21 09:11:59 PST 2016
Author: sanjoy
Date: Sun Feb 21 11:11:59 2016
New Revision: 261481
URL: http://llvm.org/viewvc/llvm-project?rev=261481&view=rev
Log:
[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.
Modified:
llvm/trunk/lib/Transforms/Scalar/LoopDeletion.cpp
Modified: llvm/trunk/lib/Transforms/Scalar/LoopDeletion.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopDeletion.cpp?rev=261481&r1=261480&r2=261481&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopDeletion.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopDeletion.cpp Sun Feb 21 11:11:59 2016
@@ -122,6 +122,9 @@ bool LoopDeletion::runOnLoop(Loop *L, LP
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, LP
// 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) {
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