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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113734] [14 regression] libarchive
 miscompiled (fails libarchive_test_read_format_rar5_extra_field_version test)
 since r14-8768-g85094e2aa6dba7
Date: Tue, 13 Feb 2024 11:05:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113734

--- Comment #27 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tamar Christina <tnfchris@gcc.gnu.org=
>:

https://gcc.gnu.org/g:491e57451df47cda88f658601a92d6d006ae09d7

commit r14-8952-g491e57451df47cda88f658601a92d6d006ae09d7
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Tue Feb 13 11:04:38 2024 +0000

    middle-end: update vector loop upper bounds when early break vect
[PR113734]

    When doing early break vectorization we should treat the final iteratio=
n as
    possibly being partial.  This so that when we calculate the vector loop
upper
    bounds we take into account that final iteration could have done some w=
ork.

    The attached testcase shows that if we don't then cunroll may unroll the
loop an
    if the upper bound is wrong we lose a vector iteration.

    This is similar to how we adjust the scalar loop bounds for the PEELED
case.

    gcc/ChangeLog:

            PR tree-optimization/113734
            * tree-vect-loop.cc (vect_transform_loop): Treat the final
iteration of
            an early break loop as partial.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/113734
            * gcc.dg/vect/vect-early-break_117-pr113734.c: New test.=