[llvm-bugs] [Bug 51598] New: opt -enable-new-pm=1 -loop-load-elim -indvars -loop-distribute -enable-loop-distribute crashes with Assertion `Ptr != End && "dereferencing end() iterator"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51598

            Bug ID: 51598
           Summary: opt -enable-new-pm=1 -loop-load-elim -indvars
                    -loop-distribute -enable-loop-distribute crashes with
                    Assertion `Ptr != End && "dereferencing end()
                    iterator"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: mikael.holmen at ericsson.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 25184
  --> https://bugs.llvm.org/attachment.cgi?id=25184&action=edit
bbi-58974.ll reproducer

llvm commit ebf35370ff59

Reproduce with:
 opt -enable-new-pm=1 -loop-load-elim -indvars -loop-distribute
-enable-loop-distribute -o /dev/null bbi-58974.ll

Result:
opt: ../include/llvm/ADT/DenseMap.h:1242: llvm::DenseMapIterator::pointer
llvm::DenseMapIterator<llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > >, std::vector<unsigned int,
std::allocator<unsigned int> >,
llvm::DenseMapInfo<llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > > >,
llvm::detail::DenseMapPair<llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > >, std::vector<unsigned int,
std::allocator<unsigned int> > >, true>::operator->() const [KeyT =
llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > >, ValueT = std::vector<unsigned
int, std::allocator<unsigned int> >, KeyInfoT =
llvm::DenseMapInfo<llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > > >, Bucket =
llvm::detail::DenseMapPair<llvm::PointerIntPair<llvm::Value *, 1, bool,
llvm::PointerLikeTypeTraits<llvm::Value *>,
llvm::PointerIntPairInfo<llvm::Value *, 1,
llvm::PointerLikeTypeTraits<llvm::Value *> > >, std::vector<unsigned int,
std::allocator<unsigned int> > >, IsConst = true]: Assertion `Ptr != End &&
"dereferencing end() iterator"' failed.

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