[llvm-bugs] [Bug 40782] New: [Loop unswitch + MemSSA Loop Dep] Assertion "Trying to remove memory access that still has uses"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40782

            Bug ID: 40782
           Summary: [Loop unswitch + MemSSA Loop Dep]  Assertion "Trying
                    to remove memory access that still has uses"' failed.
           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 21495
  --> https://bugs.llvm.org/attachment.cgi?id=21495&action=edit
reduced testcase

bin/opt -mtriple=systemz-unknown -mcpu=z13 ./tc_rem_stilluses.ll -O3 -S -o
out.opt.ll -enable-mssa-loop-dependency -enable-simple-loop-unswitch

lib/Analysis/MemorySSA.cpp:1714: void
llvm::MemorySSA::removeFromLookups(llvm::MemoryAccess*): Assertion
`MA->use_empty() && "Trying to remove memory access that still has uses"'
failed.

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