[llvm-bugs] [Bug 38283] New: [SimpleLoopUnswitch] Assertion `OldContainingL->hasDedicatedExits() && "Unexpected predecessor of hoisted loop preheader!"' failed.

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https://bugs.llvm.org/show_bug.cgi?id=38283

            Bug ID: 38283
           Summary: [SimpleLoopUnswitch]  Assertion
                    `OldContainingL->hasDedicatedExits() && "Unexpected
                    predecessor of hoisted loop preheader!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20593
  --> https://bugs.llvm.org/attachment.cgi?id=20593&action=edit
reduced testcase

Getting dozens of test failures with -enable-simple-loop-unswitch currently.
Attached is a reduced test case for opt:

opt -mtriple=s390x-linux-gnu -O3 -mcpu=z13 -enable-simple-loop-unswitch
./tc_simpleloopunsw.ll

opt:
/home/ijonpan/llvm/llvm-dev/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp:308:
void hoistLoopToNewParent(llvm::Loop&, llvm::BasicBlock&, llvm::DominatorTree&,
llvm::LoopInfo&): Assertion `OldContainingL->hasDedicatedExit\
s() && "Unexpected predecessor of hoisted loop preheader!"' failed.
Stack dump:
0.      Program arguments: /home/ijonpan/llvm/build/llvm-dev/bin/opt
-mtriple=s390x-linux-gnu -O3 -mcpu=z13 -enable-simple-loop-unswitch
./tc_simpleloopunsw.ll
1.      Running pass 'CallGraph Pass Manager' on module
'./tc_simpleloopunsw.ll'.
2.      Running pass 'Loop Pass Manager' on function '@func_9'
3.      Running pass 'Simple unswitch loops' on basic block '%bb9'
...

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