[Bug tree-optimization/105254] ICE in exact_div, at poly-int.h:2219

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105254

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Richard Sandiford <rsandifo@gcc.gnu.org>:

https://gcc.gnu.org/g:f2ebf2d98efe0ac2314b58cf474f44cb8ebd5244

commit r12-8146-gf2ebf2d98efe0ac2314b58cf474f44cb8ebd5244
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Wed Apr 13 17:53:54 2022 +0100

    aarch64: Make sure the UF divides the VF [PR105254]

    In this PR, we were trying to set the unroll factor to a value higher
    than the minimum VF (or more specifically, to a value that doesn't
    divide the VF).  I guess there are two approaches to this: let the
    target pick any value it likes and make target-independent code pare
    it back to something that makes sense, or require targets to supply
    sensible values from the outset.  This patch goes for the latter
    approach.

    gcc/
            PR tree-optimization/105254
            * config/aarch64/aarch64.cc
            (aarch64_vector_costs::determine_suggested_unroll_factor): Take a
            loop_vec_info as argument.  Restrict the unroll factor to values
            that divide the VF.
            (aarch64_vector_costs::finish_cost): Update call accordingly.

    gcc/testsuite/
            PR tree-optimization/105254
            * g++.dg/vect/pr105254.cc: New test.