From 3d1b0da292e383ce2a139c1612ec7e07336bbcd8 Mon Sep 17 00:00:00 2001
From: vchernon <chernonog.vyacheslav@huawei.com>
Date: Fri, 22 Dec 2023 22:05:27 +0800
Subject: [PATCH 3/4] [rtl-ifcvt] refuse to rename def in the last instruction
 in BB

---
 gcc/ifcvt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c
index 3df0f6fdd..025eb6cd1 100644
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -2176,7 +2176,10 @@ noce_rename_regs_in_bb (basic_block test_bb, bitmap rename_regs)
       rtx x = SET_DEST (sset);
       if (!REG_P (x) || !bitmap_bit_p (rename_regs, REGNO (x)))
 	continue;
-
+      /* Do not need to rename dest in the last instruction
+	 it will be renamed anyway.  */
+      if (insn == last_insn)
+	continue;
       machine_mode mode = GET_MODE (x);
       rtx tmp = gen_reg_rtx (mode);
       if (!validate_replace_rtx_part (x, tmp, &SET_DEST (sset), insn))
-- 
2.33.0