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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: Tue, 10 Nov 2020 08:12:28 +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
----------------------------------------------------------------------------
   Last reconfirmed|                            |2020-11-10
     Ever confirmed|0                           |1
             Blocks|                            |53947
             Status|UNCONFIRMED                 |NEW

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
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?

Alternatively the vectorizer can use patterns to do this.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations=