[llvm-bugs] [Bug 27945] Compiler crash in "Induction Variable Simplification" for "-fno-exceptions"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27945

Sanjoy Das <sanjoy at playingwithpointers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |michael.v.zolotukhin at gmail.
                   |                            |com
         Resolution|---                         |DUPLICATE

--- Comment #2 from Sanjoy Das <sanjoy at playingwithpointers.com> ---
Running with this patch 

diff --git a/lib/Analysis/LoopPass.cpp b/lib/Analysis/LoopPass.cpp
index 3181e4f..0ea2bf4 100644
--- a/lib/Analysis/LoopPass.cpp
+++ b/lib/Analysis/LoopPass.cpp
@@ -14,6 +14,7 @@

//===----------------------------------------------------------------------===//

 #include "llvm/Analysis/LoopPass.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/OptBisect.h"
@@ -197,6 +198,15 @@ bool LPPassManager::runOnFunction(Function &F) {
         TimeRegion PassTimer(getPassTimer(P));

         Changed |= P->runOnLoop(CurrentLoop, *this);
+
+        DominatorTree DT;
+        DT.recalculate(F);
+        for (auto *L : make_range(LI->begin(), LI->end())) {
+          if (!L->isRecursivelyLCSSAForm(DT)) {
+            dbgs() << "Broke LCSSA after running " << P->getPassName() << "n";
+            assert(false);
+          }
+        }
       }
       LoopWasDeleted = CurrentLoop->isInvalid();

Crashes as:

Broke LCSSA after running Unroll loops
Assertion failed: (false), function runOnFunction, file
../../lib/Analysis/LoopPass.cpp, line 207.


So it is most likely a duplicate of PR26682.

*** This bug has been marked as a duplicate of bug 26682 ***

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