* [PATCH] RISC-V: Avoid redundant flow in forward fusion
@ 2023-01-09 22:40 juzhe.zhong
2023-01-26 19:14 ` Kito Cheng
0 siblings, 1 reply; 2+ messages in thread
From: juzhe.zhong @ 2023-01-09 22:40 UTC (permalink / raw)
To: gcc-patches; +Cc: kito.cheng, palmer, Ju-Zhe Zhong
From: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] RISC-V: Avoid redundant flow in forward fusion
2023-01-09 22:40 [PATCH] RISC-V: Avoid redundant flow in forward fusion juzhe.zhong
@ 2023-01-26 19:14 ` Kito Cheng
0 siblings, 0 replies; 2+ messages in thread
From: Kito Cheng @ 2023-01-26 19:14 UTC (permalink / raw)
To: juzhe.zhong; +Cc: gcc-patches, palmer
[-- Attachment #1: Type: text/plain, Size: 1438 bytes --]
committed, thanks.
On Tue, Jan 10, 2023 at 6:40 AM <juzhe.zhong@rivai.ai> wrote:
> From: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
>
> 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
>
>
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2023-01-26 19:14 ` Kito Cheng
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