llvm dev - Sep 2020 - Vectorization of math function failed?

I've tried to do:

clang++ -O3 -march=native -mtune=native \
-Rpass=loop-vectorize,slp-vectorize
-Rpass-missed=loop-vectorize,slp-vectorize
-Rpass-analysis=loop-vectorize,slp-vectorize \
-ffast-math -ffp-model=fast -ffp-exception-behavior=ignore -ffp-contract=fast \
-c -o vec.o vec.cc

But I've got no feedback.

-- 
Alexandre Bique

Hi Alexandre,

I am not sure if we can generate vector calls to GlibC libmvec.

I can see the following vector math libraries supported.

---Snip llvm/lib/Analysis/TargetLibraryInfo.cpp--
static cl::opt<TargetLibraryInfoImpl::VectorLibrary> ClVectorLibrary(
    "vector-library", cl::Hidden, cl::desc("Vector functions
library"),
    cl::init(TargetLibraryInfoImpl::NoLibrary),
    cl::values(clEnumValN(TargetLibraryInfoImpl::NoLibrary, "none",
                          "No vector functions library"),
               clEnumValN(TargetLibraryInfoImpl::Accelerate,
"Accelerate",
                          "Accelerate framework"),
               clEnumValN(TargetLibraryInfoImpl::MASSV, "MASSV",
                          "IBM MASS vector library"),
               clEnumValN(TargetLibraryInfoImpl::SVML, "SVML",
                          "Intel SVML library")));
---Snip--

./clang --autocomplete=-fveclibAccelerate
MASSV
none
SVML

For SVML (Intel vector math library ),  you need to use -mllvm
-vector-library=SVML  or -fveclib=SVML.

regards,
Venkat.

On Tue, 1 Sep 2020 at 12:16, Alexandre Bique via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I've tried to do:
>
> clang++ -O3 -march=native -mtune=native \
> -Rpass=loop-vectorize,slp-vectorize
> -Rpass-missed=loop-vectorize,slp-vectorize
> -Rpass-analysis=loop-vectorize,slp-vectorize \
> -ffast-math -ffp-model=fast -ffp-exception-behavior=ignore
> -ffp-contract=fast \
> -c -o vec.o vec.cc
>
> But I've got no feedback.
>
> --
> Alexandre Bique
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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On Tue, Sep 1, 2020 at 9:07 AM Venkataramanan Kumar
<venkataramanan.kumar.llvm at gmail.com> wrote:
>   Hi Alexandre,
Hi Venkataramanan,
> I am not sure if we can generate vector calls to GlibC libmvec.
Is the support for libmvec on the roadmap? If not how to add it?
> ./clang --autocomplete=-fveclibThis is amazing, thank you! I think it
should be documented in clang
auto vectorization documentation.

Thank you very much,
-- 
Alexandre BIQUE