[PATCH] D67572: [VectorUtils] Introduce the Vector Function Database (VFDatabase).

[Francesco Petrogalli via Phabricator via llvm-commits]

fpetrogalli added a comment.

In D67572#1781286 <https://reviews.llvm.org/D67572#1781286>, @uabelho wrote:

>




> We have a bunch of target intrinsics that we say are vectorizable, but we don't provide a name of the vector version of the intrinsic.

You can still use the name mangling of the VFABI attribute (for internal LLVM mangling) to map a scalar attribute to its vector version:

  _ZGV_LLVM_N2v_llvm.custom.attribute(llvm.custom.attribute)

With this, the `VFDatabase::getMappings(*CI).empty()` woudl return false, so that the intrinsic would be vectorized as a regular function. Then, you could use the post-vectorization pass I mentioned in the previous message to scalarize it.

The mappings in the IR could be added by the frontend, or in a pre-vectorization pass if you don't want to touch the frontend.


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