[llvm-bugs] [Bug 47935] New: BPF: backport commit 31611721686760fe59c91a84b025e4dee94d1662

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47935

            Bug ID: 47935
           Summary: BPF: backport commit
                    31611721686760fe59c91a84b025e4dee94d1662
           Product: new-bugs
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ys114321 at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

I would like to backport the following commit to llvm 11.0.1.

commit 31611721686760fe59c91a84b025e4dee94d1662 (isel)
Author: Yonghong Song <yhs at fb.com>
Date:   Wed Oct 7 16:24:33 2020 -0700

    BPF: fix incorrect DAG2DAG load optimization

    Currently, bpf backend Instruction section DAG2DAG phase has
    an optimization to replace loading constant struct memeber
    or array element with direct values. The reason is that these
    locally defined struct or array variables may have their
    initial values stored in a readonly section and early bpf
    ecosystem is not able to handle such cases.
...

This fixed a bug where wrong code could be generated.

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