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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97770] [ICELAKE]Missing vectorization for vpopcnt
Date: Thu, 12 Nov 2020 07:33:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97770

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, but

DEF_INTERNAL_INT_FN (POPCOUNT, ECF_CONST | ECF_NOTHROW, popcount, unary)

so there's clearly a mismatch between either the vectorizers interpretation
or the optab.  But as far as I can see this is not a direct internal fn so
vectorizable_internal_function shouldn't apply and I do not see the x86
backend handle POPCOUNT in the vectorizable function target hook.

So w/o a compiler capable I can't trace how the vectorizer vectorizes this
and thus I have no idea where it goes wrong ...=