I think it is a typo. When calculating the 'SET_SRC (x)' cost,
outer_code should be set to SET.

gcc/
        * config/riscv/riscv.cc (riscv_rtx_costs): Fix the outer_code
        when calculating the cost of SET expression.
---
 gcc/config/riscv/riscv.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 6efe14ff199f..1b4a5c39c667 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -3775,7 +3775,7 @@ riscv_rtx_costs (rtx x, machine_mode mode, int 
outer_code, int opno ATTRIBUTE_UN
              *total = COSTS_N_INSNS (1);
              return true;
            }
-         riscv_rtx_costs (SET_SRC (x), mode, outer_code, opno, total, speed);
+         riscv_rtx_costs (SET_SRC (x), mode, SET, opno, total, speed);
          return true;
        }
 
-- 
2.43.0

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