[llvm-dev] Question on llvm-diff tool

[Bill Wendling via llvm-dev]

Some context. Here are the type definitions and global definition:

  %struct.vmcs_layout = type { i32, [2048 x %struct.vmcs_entry] }
  %struct.vmcs_entry = type { i16, i16 }
    ...
  @vmcs_layout = internal global %struct.vmcs_layout zeroinitializer, align
4, !dbg !10400

It seems like it's applying the ".663" suffix because of a name clash with
the other type.

-bw

On Thu, Jun 17, 2021 at 5:00 PM Yonghyun Hwang <yonghyun at google.com> wrote:

> Hello,
>
> I'm using the 'llvm-diff' tool to diff two llvm assembly files. While
> doing that, I've observed that the 'llvm-diff' tool shows lots of diffs
> even when the same assembly files are given as command line arguments. For
> example, if we run
>
> $ llvm-diff test.ll test.ll
>
> 'llvm-diff' shows lots of diffs for "static" global variables. This is an
> example.
>
> // in test.c
> static struct vmcs_layout vmcs_layout;
>
> output for 'llvm-diff' is as follows.
>
>     >   %3 = load i32, i32* getelementptr inbounds (%
> *struct.vmcs_layout.663*, %struct.vmcs_layout.663* @vmcs_layout, i64 0,
> i32 0), align 4
>     <   %3 = load i32, i32* getelementptr inbounds (%*struct.vmcs_layout*,
> %struct.vmcs_layout* @vmcs_layout, i64 0, i32 0), align 4
>
> The difference is a suffix, 663. Is this behavior intentional for
> 'llvm-diff'? If it's intentional, how can I update 'llvm-diff' tool to see
> "no" diffs for the same .ll file?
>
> Thank you,
> Yonghyun
>
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