[llvm-bugs] [Bug 29028] New: Bugpoint enhancement: Simplify pointer types

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29028

            Bug ID: 29028
           Summary: Bugpoint enhancement: Simplify pointer types
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: bugpoint
          Assignee: unassignedbugs at nondot.org
          Reporter: matze at braunis.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

It is often possible to simplify pointer types to further simplify the output.
Example:

I had a case where instead of this:

%"class.llvm::ilist_node.271.331.53909.117119.330.3340.3942.4544.6350.9962.12644"
= type {
%"struct.llvm::ilist_node_base.106.53685.116895.106.3116.3718.4320.6126.9738.12643"
}
%"struct.llvm::ilist_node_base.106.53685.116895.106.3116.3718.4320.6126.9738.12643"
= type {
%"class.llvm::PointerIntPair.0.105.53684.116894.105.3115.3717.4319.6125.9737.12642",
%"struct.llvm::ilist_node_base.106.53685.116895.106.3116.3718.4320.6126.9738.12643"*
}
%"class.llvm::PointerIntPair.0.105.53684.116894.105.3115.3717.4319.6125.9737.12642"
= type { i64 }
...
%cmp.i202 = icmp eq
%"class.llvm::ilist_node.271.331.53909.117119.330.3340.3942.4544.6350.9962.12644"*
undef, undef


This would do and save a bunch of type declarations:

%cmp.i202 = icmp eq i8* undef, undef

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