[llvm-dev] LLVM log file

[Stefanos Baziotis via llvm-dev]

Hi Sudakshina,

Not really sure what you mean by "applied", so, let me offer some more
ideas other than Brian's and Adrian's great suggestions. First, there are
some
diagnostics / remarks flags in Clang like the -R family [1] or some -f
flags about printing optimization reports [2] from Clang. They can be
useful or useless depending
on your case. They can also be parsed relatively easily.

If you just want to see a list of passes that were attempted in your code,
you can do it with: `-mllvm -opt-bisect-limit=-1`
You can also use `-mllvm-debug-pass=Arguments` to see the arguments that
were passed.

Moving into opt, you can use something like `print-after-all`, which was
already mentioned. If you don't know what these flags do, is they show you
the IR in different stages in the pipeline (e.g., `print-after-all` shows
you each pass attempted and how the IR is after it).

Hope it helps,
Stefanos

[1]
https://clang.llvm.org/docs/ClangCommandLineReference.html#diagnostic-flags
[2]
https://clang.llvm.org/docs/UsersManual.html#cmdoption-f-no-save-optimization-record

Στις Κυρ, 24 Ιαν 2021 στις 5:47 π.μ., ο/η Adrian Vogelsgesang via llvm-dev <
llvm-dev at lists.llvm.org> έγραψε:

> I used “-print-changed”, “-print-before-all”, “print-after-all” last time
> I wanted to see the passes together with their inout/output IR modules.
>
> In my case, I used them through “clang++”, i.e. I had to prefix them with
> “-mllvm”
> > clang++ test_file.cpp -mllvm -print-after-all
>
>
>
> *From: *llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Brian
> Cain via llvm-dev <llvm-dev at lists.llvm.org>
> *Date: *Sunday, 24. January 2021 at 04:40
> *To: *Sudakshina Dutta <sudakshina at iitgoa.ac.in>
> *Cc: *LLVM Development List <llvm-dev at lists.llvm.org>
> *Subject: *Re: [llvm-dev] LLVM log file
>
> I don't know if it's exhaustive but there's the "remarks" feature:
>
>
>
>
> https://llvm.org/docs/Remarks.html#introduction-to-the-llvm-remark-diagnostics
>
>
>
> On Sat, Jan 23, 2021 at 9:20 PM Sudakshina Dutta via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Dear all,
>
>
>
> Good morning. I want to know whether LLVM creates any log file consisting
> of applied optimizations in the optimization phase. It will be really
> useful for the researchers who work on compilers, formal methods, etc.
>
>
>
> Thanks,
>
> Sudakshina
>
> _______________________________________________
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> llvm-dev at lists.llvm.org
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>
>
>
>
> --
>
> -Brian
> _______________________________________________
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