[llvm-dev] Vectorization of math function failed?

[Venkataramanan Kumar via llvm-dev]

  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=-fveclib=
Accelerate
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
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> llvm-dev at lists.llvm.org
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