[llvm-bugs] [Bug 41640] New: [mssa-loop-dep] Segmentation fault

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41640

            Bug ID: 41640
           Summary: [mssa-loop-dep]  Segmentation fault
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 21842
  --> https://bugs.llvm.org/attachment.cgi?id=21842&action=edit
reduced testcase

opt -O3 -S -mtriple=s390x-linux-gnu -mcpu=z13 tc_mssaloop_segflt.ll -o
out.opt.ll -enable-mssa-loop-dependency
Stack dump:
0.      Program arguments: opt -O3 -S -mtriple=s390x-linux-gnu -mcpu=z13
tc_mssaloop_segflt.ll -o out.opt.ll -enable-mssa-loop-dependency
1.      Running pass 'CallGraph Pass Manager' on module
'tc_mssaloop_segflt.ll'.
2.      Running pass 'Loop Pass Manager' on function '@1'
3.      Running pass 'Loop Invariant Code Motion' on basic block
'%thread-pre-split.i'
...
#4 0x000002aa029db93e
llvm::MemorySSA::renamePass(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::MemoryAccess*, llvm::SmallPtrSetImpl<llvm::BasicBloc\
k*>&, bool, bool)
#5 0x000002aa03d32280 llvm::MemorySSAUpdater::insertDef(llvm::MemoryDef*, bool)
#6 0x000002aa03485c24 (anonymous
namespace)::LoopPromoter::doExtraRewritesBeforeFinalDeletion() 
#7 0x000002aa037bd64c
llvm::LoadAndStorePromoter::run(llvm::SmallVectorImpl<llvm::Instruction*>
const&)
#8 0x000002aa03483d58
llvm::promoteLoopAccessesToScalars(llvm::SmallSetVector<llvm::Value*, 8u>
const&, llvm::SmallVectorImpl<llvm::BasicBlock*>&, llv\
m::SmallVectorImpl<llvm::Instruction*>&,
llvm::SmallVectorImpl<llvm::MemoryAccess*>&, llvm::PredIteratorCache&,
llvm::LoopInfo*, llvm::DominatorTree*,\
 llvm::TargetLibraryInfo const*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::MemorySSAUpdater*, llvm::ICFLoopSafetyInfo*,
llvm::OptimizationRemarkEmitt\
er*)
#9 0x000002aa0348e3bc (anonymous
namespace)::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, \
llvm::TargetLibraryInfo*, llvm::TargetTransformInfo*, llvm::ScalarEvolution*,
llvm::MemorySSA*, llvm::OptimizationRemarkEmitter*, bool) (.constprop.76\
1)
#10 0x000002aa0348ef12 (anonymous
namespace)::LegacyLICMPass::runOnLoop(llvm::Loop*, llvm::LPPassManager&)

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