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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/92658] x86 lacks vector extend / truncate
Date: Wed, 15 Dec 2021 01:46:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92658

--- Comment #25 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Uro=C5=A1 Bizjak from comment #5)
> Created attachment 47927 [details]
> Prototype patch v2
>=20
> A couple of typos fixed.
>=20
> Still doesn't vectorize v4qi->v4si, v2qi->v2di, v2hi->v2di and v4qi->v4di.
>=20
> Looks like tree-opt issue, as explained in Comment #4.

v4qi->v4si, v2hi->v2di and v4qi->v4di are vectorized, but v2qi->v2di is not,
guess it's related to 16-bit vector support.=