[llvm-bugs] [Bug 36954] New: [GVNSink] Seg Fault after deep recursion in lookupOrAdd()

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36954

            Bug ID: 36954
           Summary: [GVNSink]  Seg Fault after deep recursion in
                    lookupOrAdd()
           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 20144
  --> https://bugs.llvm.org/attachment.cgi?id=20144&action=edit
reduced testcase

bin/opt -mtriple=s390x-linux-gnu -mcpu=z13 ./tc_gvnsink.ll -S -o /dev/null -O3
-enable-gvn-sink

#255 0x000002aa1f364dea (anonymous
namespace)::ValueTable::lookupOrAdd(llvm::Value*) (bin/opt+0xe64dea)
Stack dump:
0.      Program arguments: bin/opt -mtriple=s390x-linux-gnu -mcpu=z13
./tc_gvnsink.ll -S -o /dev/null -O3 -enable-gvn-sink 
1.      Running pass 'CallGraph Pass Manager' on module './tc_gvnsink.ll'.
2.      Running pass 'Early GVN sinking of Expressions' on function '@2'
Segmentation fault

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