committed, thanks.
On Tue, Jan 10, 2023 at 6:40 AM wrote:
> From: Ju-Zhe Zhong
>
> gcc/ChangeLog:
>
> * config/riscv/riscv-vsetvl.cc
> (pass_vsetvl::forward_demand_fusion): Add pre-check for redundant flow.
>
> ---
> gcc/config/riscv/riscv-vsetvl.cc | 8
> 1 file changed, 8 insertions(+)
>
> diff --git a/gcc/config/riscv/riscv-vsetvl.cc
> b/gcc/config/riscv/riscv-vsetvl.cc
> index 7800c2ee509..18c6f437db6 100644
> --- a/gcc/config/riscv/riscv-vsetvl.cc
> +++ b/gcc/config/riscv/riscv-vsetvl.cc
> @@ -2140,6 +2140,9 @@ pass_vsetvl::forward_demand_fusion (void)
>if (!prop.valid_or_dirty_p ())
> continue;
>
> + if (cfg_bb == ENTRY_BLOCK_PTR_FOR_FN (cfun))
> + continue;
> +
>edge e;
>edge_iterator ei;
>/* Forward propagate to each successor. */
> @@ -2153,6 +2156,11 @@ pass_vsetvl::forward_demand_fusion (void)
> /* It's quite obvious, we don't need to propagate itself. */
> if (e->dest->index == cfg_bb->index)
> continue;
> + /* We don't propagate through critical edges. */
> + if (e->flags & EDGE_COMPLEX)
> + continue;
> + if (e->dest->index == EXIT_BLOCK_PTR_FOR_FN (cfun)->index)
> + continue;
>
> /* If there is nothing to propagate, just skip it. */
> if (!local_dem.valid_or_dirty_p ())
> --
> 2.36.1
>
>
