[Bug target/125670] internal compiler error: in has_vl, at config/riscv/riscv-vsetvl.cc

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125670

--- Comment #10 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Jeff Law <law@gcc.gnu.org>:

https://gcc.gnu.org/g:8d3e022a1b839d4226afc36d5842b07e4d976f63

commit r15-11309-g8d3e022a1b839d4226afc36d5842b07e4d976f63
Author: Robin Dapp <rdapp.gcc@gmail.com>
Date:   Tue Jun 16 06:54:48 2026 -0600

    [PATCH] RISC-V: Fix splitter [PR125670].

    Hi,

    In the PR we ICE during vsetvl, expecting a register in the VL operand
    slot which only contains an immediate 4.  Non-VLMAX insns with immediate
    length have a NULL_RTX in that slot.

    However, during a split, we erroneously use operand[5] instead of
    operand[6].  operand[5] is the mask policy and happened to be "1".
    "1" indicates a VLMAX insn in the avl_type operand.  This caused the
    wrong turn in vsetvl.

    The patch just corrects the operand number.

    Regtested on rv64gcv_zvl512b.  Going to wait for the CI.

    Regards
     Robin

            PR target/125670

    gcc/ChangeLog:

            * config/riscv/autovec-opt.md: Use avl_type operand number.

    gcc/testsuite/ChangeLog:

            * gcc.target/riscv/rvv/autovec/pr125670.c: New test.

    (cherry picked from commit d815c8e374c85a36b8df244287ea1a2159cbd950)