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[docs] Add a brief description of using -fveclib to enable some math library vectorizations #119215

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Dec 9, 2024
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[docs] Add a brief description of using -fveclib to enable some math library vectorizations #119215

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10 changes: 10 additions & 0 deletions llvm/docs/Vectorizers.rst
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Expand Up @@ -345,6 +345,16 @@ instruction is available.
f[i] = floorf(f[i]);
}

Many of these math functions are only vectorizable if the file has been built
with a specified target vector library that provides a vector implemention
of that math function. Using clang, this is handled by the "-fveclib" command
line option with one of the following vector libraries:
"accelerate,libmvec,massv,svml,sleef,darwin_libsystem_m,armpl,amdlibm"

.. code-block:: console

$ clang ... -fno-math-errno -fveclib=libmvec file.c

Partial unrolling during vectorization
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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