[Bug tree-optimization/123074] ICE vectorizing parest on riscv in vect_get_loop_len.

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123074

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Robin Dapp <rdapp@gcc.gnu.org>:

https://gcc.gnu.org/g:87b1ac612af1447b508354a5ffa2e6b9344044c4

commit r16-6000-g87b1ac612af1447b508354a5ffa2e6b9344044c4
Author: Robin Dapp <rdapp@ventanamicro.com>
Date:   Tue Dec 9 13:07:36 2025 +0100

    vect: Reset using_select_vl_p before starting over [PR123074].

    In the PR we ICE accessing the loop lens in
    vect_get_loop_variant_data_ptr_increment when building 510.parest.
    This function only gets called when we use SELECT_VL for the loop
    control, however during initialization of the loop lens partial
    vectors, a prerequisite for SELECT_VL, was false while using_select_vl
    was true.  We reset using_partial_vectors when restarting the analysis
    after forcing single-lane SLP but don't reset using_select_vl.

    This patch resets it as well.

            PR tree-optimization/123074

    gcc/ChangeLog:

            * tree-vect-loop.cc: Reset LOOP_VINFO_USING_SELECT_VL_P.

    gcc/testsuite/ChangeLog:

            * gcc.target/riscv/rvv/rvv.exp: Include *.C.
            * gcc.target/riscv/rvv/autovec/pr123074.C: New test.