[llvm-bugs] [Bug 51463] New: llc -O0 generates incorrect debug information when compiling IR containing llvm.dbg.value

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51463

            Bug ID: 51463
           Summary: llc -O0 generates incorrect debug information when
                    compiling IR containing llvm.dbg.value
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dwight.guth at runtimeverification.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 25128
  --> https://bugs.llvm.org/attachment.cgi?id=25128&action=edit
minimized llvm IR

If you take the attached LLVM IR containing debug information and try to
compile it into an executable using `llc -O0`, GDB (tested using version 9.2)
will not be able to report the value of `x` if you are stopped at a breakpoint
on the `foo` function. This seems to have worked as recently as llvm 11. This
is on an AMD64 machine. I can reproduce this on the main branch of llvm.

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