[RFC PATCH 3/3] tcg/riscv: Remove a wrong optimization for addsub2

[LIU Zhiwei]

It's not clear what it is doing here. And it's wrong because bl and
al are both register, so we can't add them by an ADDI instruction.

Signed-off-by: LIU Zhiwei <zhiwei_...@linux.alibaba.com>
---
 tcg/riscv/tcg-target.c.inc | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index bfdf2bea69..a07fd0864f 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -705,9 +705,6 @@ static void tcg_out_addsub2(TCGContext *s,
                 tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0,
                                 rl, al);
             }
-        } else if (rl == al && rl == bl) {
-            tcg_out_opc_imm(s, OPC_SLTI, TCG_REG_TMP0, al, 0);
-            tcg_out_opc_reg(s, opc_addi, rl, al, bl);
         } else {
             tcg_out_opc_reg(s, opc_add, rl, al, bl);
             tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0,
-- 
2.25.1