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

[juzhe . zhong]

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

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