diff options
| -rw-r--r-- | target/s390x/translate.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/target/s390x/translate.c b/target/s390x/translate.c index 3a0a3ee519..4c48c593cd 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -1518,6 +1518,21 @@ static ExitStatus op_bc(DisasContext *s, DisasOps *o) int imm = is_imm ? get_field(s->fields, i2) : 0; DisasCompare c; + /* BCR with R2 = 0 causes no branching */ + if (have_field(s->fields, r2) && get_field(s->fields, r2) == 0) { + if (m1 == 14) { + /* Perform serialization */ + /* FIXME: check for fast-BCR-serialization facility */ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); + } + if (m1 == 15) { + /* Perform serialization */ + /* FIXME: perform checkpoint-synchronisation */ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); + } + return NO_EXIT; + } + disas_jcc(s, &c, m1); return help_branch(s, &c, is_imm, imm, o->in2); } |