Re: [PATCH] RISC-V: Avoid redundant flow in backward fusion

[Kito Cheng via Gcc-patches]

merged into another commit,, thanks.

On Tue, Jan 10, 2023 at 6:51 AM  wrote:

> From: Ju-Zhe Zhong 
>
> gcc/ChangeLog:
>
> * config/riscv/riscv-vsetvl.cc
> (pass_vsetvl::backward_demand_fusion): Add pre-check to avoid redundant
> flow.
>
> ---
>  gcc/config/riscv/riscv-vsetvl.cc | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/gcc/config/riscv/riscv-vsetvl.cc
> b/gcc/config/riscv/riscv-vsetvl.cc
> index 0ca1c51d121..a972c49561a 100644
> --- a/gcc/config/riscv/riscv-vsetvl.cc
> +++ b/gcc/config/riscv/riscv-vsetvl.cc
> @@ -2020,6 +2020,8 @@ pass_vsetvl::backward_demand_fusion (void)
>
>if (!backward_propagate_worthwhile_p (cfg_bb, curr_block_info))
> continue;
> +
> +  if (cfg_bb == EXIT_BLOCK_PTR_FOR_FN (cfun))
> continue;
>
>edge e;
> --
> 2.36.1
>
>

[PATCH] RISC-V: Avoid redundant flow in backward fusion

[juzhe . zhong]

From: Ju-Zhe Zhong 

gcc/ChangeLog:

* config/riscv/riscv-vsetvl.cc (pass_vsetvl::backward_demand_fusion): 
Add pre-check to avoid redundant flow.

---
 gcc/config/riscv/riscv-vsetvl.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 0ca1c51d121..a972c49561a 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -2020,6 +2020,8 @@ pass_vsetvl::backward_demand_fusion (void)
 
   if (!backward_propagate_worthwhile_p (cfg_bb, curr_block_info))
continue;
+
+  if (cfg_bb == EXIT_BLOCK_PTR_FOR_FN (cfun))
continue;
 
   edge e;
-- 
2.36.1