[llvm-bugs] [Bug 34211] New: opt crashes when running BDCE: Assertion `Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34211

            Bug ID: 34211
           Summary: opt crashes when running BDCE: Assertion
                    `Ty->isSized() && "Cannot getTypeInfo() on a type that
                    is unsized!"' failed
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: david.stenberg at ericsson.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18995
  --> https://bugs.llvm.org/attachment.cgi?id=18995&action=edit
Reduced reproducer.

When running the following command line using opt from top-of-trunk:

  $ opt -bdce bugpoint-reduced-simplified.ll -o /dev/null

opt crashes due to the following assertion:

  opt: ../include/llvm/IR/DataLayout.h:533: uint64_t
llvm::DataLayout::getTypeSizeInBits(llvm::Type *) const: Assertion
`Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!"' failed.

Backtrace:

  #3  0x0000000000a05d99 in llvm::DataLayout::getTypeSizeInBits
(this=0x3dec3d8, Ty=0x3db2970)
      at ../include/llvm/IR/DataLayout.h:533
  #4  0x0000000000ebd754 in llvm::DemandedBits::getDemandedBits
(this=0x3de3190, I=0x3deeea8)
      at ../lib/Analysis/DemandedBits.cpp:375
  #5  0x0000000001c93200 in clearAssumptionsOfUsers (I=0x3deecd8, DB=...)
      at ../lib/Transforms/Scalar/BDCE.cpp:51

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