Re: [PATCH v1|GCC-13] RISC-V: Bugfix for riscv-vsetvl pass.

[Jeff Law via Gcc-patches]

On 7/15/23 20:16, Pan Li via Gcc-patches wrote:

From: Ju-Zhe Zhong <juzhe.zh...@rivai.ai>

This patch comes from part of below change, which locate one bug of rvv
vsetvel pass when auto-vectorization.

https://gcc.gnu.org/pipermail/gcc-patches/2023-July/624523.html

Unforunately, It is not easy to reproduce this bug by intrinsic APIs
but it is worth to backport to GCC 13.

Signed-off-by: Ju-Zhe Zhong <juzhe.zh...@rivai.ai>

gcc/ChangeLog:

        * config/riscv/riscv-vsetvl.cc (gen_vsetvl_pat): Add vl parameter.
        (change_vsetvl_insn): Ditto.
        (change_insn): Add validate change as well as assert.
        (pass_vsetvl::backward_demand_fusion): Allow forward.

OK for gcc-13.
jeff