[llvm-bugs] [Bug 47477] New: Unreported changes from dead-GEP removal in ArgumentPromotion

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47477

            Bug ID: 47477
           Summary: Unreported changes from dead-GEP removal in
                    ArgumentPromotion
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: llvm-bugs at lists.llvm.org, sguelton at redhat.com

Created attachment 23944
  --> https://bugs.llvm.org/attachment.cgi?id=23944&action=edit
deadgep.ll

With expensive checks:
$ opt -argpromotion -S deadgep.ll
Pass modifies its input and doesn't report it: Promote 'by reference' arguments
to scalars

It comes from
https://github.com/llvm/llvm-project/blob/1e392fc44584a4909b4dced02b8386b48963002b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp#L674-L676.

As an aside, while tracking this down, I also noticed some suspicious
modifications in
https://github.com/llvm/llvm-project/blob/1e392fc44584a4909b4dced02b8386b48963002b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp#L936-L947
but I wasn't able to cause a failure with that.

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