[Bug target/122652] RISCV: Crash at -O3 during RTL pass: vsetvl

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122652

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Robin Dapp <rdapp@gcc.gnu.org>:

https://gcc.gnu.org/g:014dd4b845d97aa5823971ea8b58cf1811662554

commit r15-10592-g014dd4b845d97aa5823971ea8b58cf1811662554
Author: Robin Dapp <rdapp@ventanamicro.com>
Date:   Wed Nov 12 10:17:47 2025 +0100

    RISC-V: vsetvl: Add null check for fault-first loop [PR122652].

    For a fault-first load we store the first instruction that read its VL
    result.  The loop to do so uses next_nondebug_insn () which returns
    nullptr when we are at the end.  Check for that before accessing the
    next insn.

            PR target/122652

    gcc/ChangeLog:

            * config/riscv/riscv-vsetvl.cc: Add nullptr check.

    gcc/testsuite/ChangeLog:

            * gcc.target/riscv/rvv/base/pr122652.c: New test.

    (cherry picked from commit b2d0abfcd5a3a58e7967eb76bb3508e5ef20d9fa)