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Subject: [Bug target/102986] [12 Regression] ICE: in expand_shift_1, at
 expmed.c:2671 with a negative shift of a vector
Date: Wed, 23 Mar 2022 09:30:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102986

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:4a9e92164a547afcf8cd3fc593c7660238ad2d59

commit r12-7777-g4a9e92164a547afcf8cd3fc593c7660238ad2d59
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 23 10:29:37 2022 +0100

    testsuite: Fix up sse2-v1ti-shift-3.c test [PR102986]

    This test is dg-do run and invokes UB when these rotate functions
    are called with 0 as second argument.  There are some other tests
    that do this but they are dg-do compile only and not even call those
    functions at all, so it IMHO doesn't matter that they are only well
    defined for [1,127] and not [0,127].

    The following patch fixes it, we pattern recognize both forms as rotates
    and we emit identical assembly.

    2022-03-23  Jakub Jelinek  <jakub@redhat.com>

            PR target/102986
            * gcc.target/i386/sse2-v1ti-shift-3.c (rotr_v1ti, rotl_v1ti,
rotr_ti,
            rotl_ti): Use -i&127 instead of 128-i to avoid UB on i =3D=3D 0=
.=