[llvm-dev] How to get optimization remarks while testing with lnt in llvm

CHINNAM KRISHNA CHAITANYA via llvm-dev llvm-dev at lists.llvm.org
Wed Jun 6 22:43:25 PDT 2018

Hi, thanks for the reply.

I've tried adding the '-fsave-optimization-record' flag, but the only
optimization records I'm getting belong to timeit.c and CMakeCCompilerId
(I'm adding flags to the lnt using --cflag).

But I'm trying to get optimization remarks for gcc-loops.cpp in
UnitTests/Vectorizer (that is the only cpp file in Vectorizer directory)

I've tried with different tests (like polybench and smallPT) but timeit.c
and CMakeCCompilerId are the only .opt.yaml files I'm getting.

I don't understand why this is happening, aren't all files supposed to be
compiled with same flags (so there should be .opt.yaml files for all the
files that are being compiled)? Any idea why this is happening?

Thanks in advance.

On Wed, Jun 6, 2018 at 3:11 AM, Francis Visoiu Mistrih <francisvm at yahoo.com>

> Hi,
> > On 4 Jun 2018, at 21:49, CHINNAM KRISHNA CHAITANYA via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hi, I'm new to llvm and am trying to run benchmarks from the test-suite
> using lnt to check loop-vectorization for various benchmarks.
> >
> > Test are compiling and executing fine, but I am not getting optimization
> remarks while using flags like -Rpass-missed=loop-vectorize and
> -Rpass-analysis=loop-vectorize
> >
> > I've tried running it like this:
> >
> >     lnt runtest test-suite --sandbox SANDBOX --cc /usr/local/bin/clang
> --test-suite ~/llvm_tests/llvm-test-suite/ --only-test
> SingleSource/UnitTests/Vectorizer/ --only-compile --use-lit
> ~/llvm/utils/lit/lit.py --cflag '-O3' --cflag '-fvectorize' --cflag
> '-Rpass-missed=loop-vectorize' --cflag '-Rpass-analysis=loop-vectorize'
> -j 70
> >
> > This isn't causing any compilation fails, but I haven't been able to get
> the optimization remarks (either to terminal or to the logs). I've gone
> through all files generated in SANDBOX for the particular test (using grep
> to search for the remarks)
> >
> > Is it possible to get optimization remarks at all? Or is there some
> other way to do this?
> clang -fsave-optimization-record should generate a .opt.yaml file with all
> the optimization remarks emitted.
> You can then read these with the opt-viewer tool (tools/opt-viewer), or
> just open the YAML files.
> Let me know if you run into any issues,
>> Francis
> >
> > Any help is appreciated, thank you.
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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