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charset="utf-8" For lock cmpxchg, the situation is more complex. After the instruction is completed by tcg_gen_atomic_cmpxchg_tl, it needs a branch to judge if oldv =3D=3D cmpv or not. The instruction only touches accumulator when oldv !=3D cmpv. Signed-off-by: Wei Li --- target/i386/tcg/translate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index 05be8d08e6..4fd9c03cb7 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -5360,7 +5360,12 @@ static target_ulong disas_insn(DisasContext *s, CPUS= tate *cpu) gen_lea_modrm(env, s, modrm); tcg_gen_atomic_cmpxchg_tl(oldv, s->A0, cmpv, newv, s->mem_index, ot | MO_LE); + label1 =3D gen_new_label(); + gen_extu(ot, oldv); + gen_extu(ot, cmpv); + tcg_gen_brcond_tl(TCG_COND_EQ, oldv, cmpv, label1); gen_op_mov_reg_v(s, ot, R_EAX, oldv); + gen_set_label(label1); } else { if (mod =3D=3D 3) { rm =3D (modrm & 7) | REX_B(s); --=20 2.30.2