diff options
| -rw-r--r-- | target-ppc/translate.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/target-ppc/translate.c b/target-ppc/translate.c index f88644118b..80d5366d27 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -1120,14 +1120,15 @@ static inline void gen_op_arith_subf(DisasContext *ctx, TCGv ret, TCGv arg1, } if (add_ca) { - /* dest = ~arg1 + arg2 + ca = arg2 - arg1 + ca - 1. */ + /* dest = ~arg1 + arg2 + ca. */ if (compute_ca) { - TCGv zero; - tcg_gen_subi_tl(cpu_ca, cpu_ca, 1); + TCGv zero, inv1 = tcg_temp_new(); + tcg_gen_not_tl(inv1, arg1); zero = tcg_const_tl(0); tcg_gen_add2_tl(t0, cpu_ca, arg2, zero, cpu_ca, zero); - tcg_gen_sub2_tl(t0, cpu_ca, t0, cpu_ca, arg1, zero); + tcg_gen_add2_tl(t0, cpu_ca, t0, cpu_ca, inv1, zero); tcg_temp_free(zero); + tcg_temp_free(inv1); } else { tcg_gen_sub_tl(t0, arg2, arg1); tcg_gen_add_tl(t0, t0, cpu_ca); |