diff options
| -rw-r--r-- | target/hppa/translate.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/target/hppa/translate.c b/target/hppa/translate.c index a3f425d861..3fc3e7754c 100644 --- a/target/hppa/translate.c +++ b/target/hppa/translate.c @@ -2763,9 +2763,29 @@ static bool do_uaddcm(DisasContext *ctx, arg_rrr_cf_d *a, bool is_tc) { TCGv_i64 tcg_r1, tcg_r2, tmp; - if (a->cf) { - nullify_over(ctx); + if (a->cf == 0) { + tcg_r2 = load_gpr(ctx, a->r2); + tmp = dest_gpr(ctx, a->t); + + if (a->r1 == 0) { + /* UADDCM r0,src,dst is the common idiom for dst = ~src. */ + tcg_gen_not_i64(tmp, tcg_r2); + } else { + /* + * Recall that r1 - r2 == r1 + ~r2 + 1. + * Thus r1 + ~r2 == r1 - r2 - 1, + * which does not require an extra temporary. + */ + tcg_r1 = load_gpr(ctx, a->r1); + tcg_gen_sub_i64(tmp, tcg_r1, tcg_r2); + tcg_gen_subi_i64(tmp, tmp, 1); + } + save_gpr(ctx, a->t, tmp); + cond_free(&ctx->null_cond); + return true; } + + nullify_over(ctx); tcg_r1 = load_gpr(ctx, a->r1); tcg_r2 = load_gpr(ctx, a->r2); tmp = tcg_temp_new_i64(); |