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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97770] [ICELAKE]Missing vectorization for vpopcnt
Date: Tue, 10 Nov 2020 10:14:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97770

--- Comment #8 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #4)
> What's missing is middle-end folding support to narrow popcount to the
> appropriate internal function call with byte/half-word width when target
> support
> is available.  But I'm quite sure there's no scalar popcount instruction
> operating on half-word or byte pieces of a GPR?

x86 has popcnt that operates on 16bit register.

https://www.felixcloutier.com/x86/popcnt=