[Bug target/103094] [12 Regression] AAPCS for new partial vector mode types (e.g. V2x8QI) are incorrect.

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103094

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Sandiford <rsandifo@gcc.gnu.org>:

https://gcc.gnu.org/g:73c3dacef9a30d7d66918606a97c496c71289f1b

commit r12-5998-g73c3dacef9a30d7d66918606a97c496c71289f1b
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Wed Dec 15 12:19:00 2021 +0000

    aarch64: Don't classify vector pairs as short vectors [PR103094]

    In this PR we were wrongly classifying a pair of 8-byte vectors
    as a 16-byte âshort vectorâ (in the AAPCS64 sense).  As the
    comment in the patch says, this stems from an old condition
    in aarch64_short_vector_p that is too loose, but that would
    be difficult to tighten now.

    We can still do the right thing for the newly-added modes though,
    since there are no backwards compatibility concerns there.

    Co-authored-by: Tamar Christina <tamar.christina@arm.com>

    gcc/
            PR target/103094
            * config/aarch64/aarch64.c (aarch64_short_vector_p): Return false
            for structure modes, rather than ignoring the type in that case.

    gcc/testsuite/
            PR target/103094
            * gcc.target/aarch64/pr103094.c: New test.