[llvm] r350334 - [UnrollRuntime] Add DomTree verification under debug mode

[Anna Thomas via llvm-commits]

Author: annat
Date: Thu Jan  3 09:44:44 2019
New Revision: 350334

URL: http://llvm.org/viewvc/llvm-project?rev=350334&view=rev
Log:
[UnrollRuntime] Add DomTree verification under debug mode

NFC: This adds the dom tree verification under debug mode at a point
just before we start unrolling the loop. This allows us to verify dom
tree at a state where it is much smaller and before the unrolling
actually happens.
This also implies we do not need to run -verify-dom-info everytime to
see if the DT is in a valid state when we transform the loop for runtime
unrolling.

Modified:
    llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp

Modified: llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp?rev=350334&r1=350333&r2=350334&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp Thu Jan  3 09:44:44 2019
@@ -927,6 +927,12 @@ bool llvm::UnrollRuntimeLoopRemainder(Lo
   // of its parent loops, so the Scalar Evolution pass needs to be run again.
   SE->forgetTopmostLoop(L);
 
+  // Verify that the Dom Tree is correct.
+#if !defined(NDEBUG)
+  if (DT)
+    assert(DT->verify(DominatorTree::VerificationLevel::Full));
+#endif
+
   // Canonicalize to LoopSimplifyForm both original and remainder loops. We
   // cannot rely on the LoopUnrollPass to do this because it only does
   // canonicalization for parent/subloops and not the sibling loops.