[llvm-bugs] [Bug 48764] New: [Unroll-and-jam] Assertion `IDomNode && "Not immediate dominator specified for block!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48764

            Bug ID: 48764
           Summary: [Unroll-and-jam] Assertion `IDomNode && "Not immediate
                    dominator specified for block!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          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 24384
  --> https://bugs.llvm.org/attachment.cgi?id=24384&action=edit
reduced testcase

opt -mcpu=z14 -O3 -enable-unroll-and-jam -allow-unroll-and-jam
-unroll-and-jam-count=8 tc_crash0_aftercreduce.ll -o - S

#9 0x0000000003a36a9c llvm::UnrollAndJamLoop(llvm::Loop*, unsigned int,
unsigned int, unsigned int, bool, llvm::LoopInfo*, llvm::ScalarEvolution*,
llvm::DominatorTree*, llvm::AssumptionCache*, llvm::TargetTransformInfo const*,
llvm::OptimizationRemarkEmitter*, llvm::Loop**) (./bin/opt+0x3a36a9c)
#10 0x000000000372f036 tryToUnrollAndJamLoop(llvm::Function&,
llvm::DominatorTree&, llvm::LoopInfo&, llvm::ScalarEvolution&,
llvm::TargetTransformInfo const&, llvm::AssumptionCache&,
llvm::DependenceInfo&, llvm::OptimizationRemarkEmitter&, int) (.isra.0)
(./bin/opt+0x372f036)
#11 0x000000000373054e (anonymous
namespace)::LoopUnrollAndJam::runOnFunction(llvm::Function&)
(./bin/opt+0x373054e)

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