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From: "xry111 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110557] [13/14 Regression] Wrong code for
 x86_64-linux-gnu with -O3 -mavx2: vectorized loop mishandles signed
 bit-fields
Date: Thu, 06 Jul 2023 10:21:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110557

--- Comment #3 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
It looks like if !UNSIGNED_TYPE (TREE_TYPE (bf_ref)), we need to generate
something like:

masked =3D (the signed variant of the wider type in {type_out, type_contain=
er})
container << (bitpos + bitsize);
result =3D (type_out) >> bitpos;=