Re: [PATCH 09/14] target/s390x: Raise exception from helper_per_branch

[Ilya Leoshkevich <iii@linux.ibm.com>]

On Wed, 2024-05-01 at 22:44 -0700, Richard Henderson wrote:
> Drop from argument, since gbea has always been updated with
> this address.  Add ilen argument for setting int_pgm_ilen.
> Use update_cc_op before calling per_branch.
> 
> By raising the exception here, we need not call
> per_check_exception later, which means we can clean up the
> normal non-exception branch path.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  target/s390x/helper.h          |  2 +-
>  target/s390x/tcg/misc_helper.c | 15 +++++++----
>  target/s390x/tcg/translate.c   | 48 ++++++++++++--------------------
> --
>  3 files changed, 27 insertions(+), 38 deletions(-)

[...]

>  static bool use_goto_tb(DisasContext *s, uint64_t dest)
>  {
> -    if (unlikely(s->base.tb->flags & FLAG_MASK_PER_BRANCH)) {
> -        return false;
> -    }

Why was this required in the first place and why can we remove it now?