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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103771] [12 Regression] Missed vectorization under
 -mavx512f -mavx512vl after r12-5489
Date: Mon, 17 Jan 2022 08:22:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103771

--- Comment #20 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Richard Biener from comment #19)
> Ah, so the issue is missing -mavx512bw which means we end up with a AVX2
> style
> mask for V32QImode.  With -mavx512bw the code vectorizes fine.

Vectorization code is worse than before, now we need to pack vectorized mask
which takes extra 3 instructions.=