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Re: [PATCH 1/2] target/s390x: Use mutable temporary value for op_ts


From: Richard Henderson
Subject: Re: [PATCH 1/2] target/s390x: Use mutable temporary value for op_ts
Date: Mon, 18 Mar 2024 07:32:21 -1000
User-agent: Mozilla Thunderbird

On 3/18/24 06:26, Ilya Leoshkevich wrote:
From: Ido Plat <ido.plat@ibm.com>

Otherwise TCG would assume the register that holds t1 would be constant
and reuse whenever it needs the value within it.

Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
[iii: Adjust a newline and capitalization]
Signed-off-by: Ido Plat <ido.plat@ibm.com>
---
  target/s390x/tcg/translate.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 0d0c672c959..3fdddac7684 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -4781,8 +4781,9 @@ static DisasJumpType op_trXX(DisasContext *s, DisasOps *o)
static DisasJumpType op_ts(DisasContext *s, DisasOps *o)
  {
-    TCGv_i32 t1 = tcg_constant_i32(0xff);
+    TCGv_i32 t1 = tcg_temp_new_i32();
+ tcg_gen_movi_i32(t1, 0xff);
      tcg_gen_atomic_xchg_i32(t1, o->in2, t1, get_mem_index(s), MO_UB);

Better as

    TCGv_i32 ff = tcg_constant_i32(0xff);
    TCGv_i32 t1 = tcg_temp_new_i32();

    tcg_gen_atomic_xchg_i32(t1, o->in2, ff, get_mem_index(s), MO_UB);

With that,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~



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