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From: "zhroma at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/93264] [10 Regression] ICE in
 cfg_layout_redirect_edge_and_branch_force, at cfgrtl.c:4522
Date: Thu, 02 Apr 2020 13:55:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D93264

--- Comment #11 from Roman Zhuykov <zhroma at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)

Thank you, I'm glad to see new ideas and some discussion.

> On the testcase itself
>=20
> diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c
> index 77254b31b42..66260fa34f1 100644
> --- a/gcc/modulo-sched.c
> +++ b/gcc/modulo-sched.c
> @@ -1347,8 +1347,7 @@ sms_schedule (void)
>    edge latch_edge;
>    HOST_WIDE_INT trip_count, max_trip_count;
>=20=20
> -  loop_optimizer_init (LOOPS_HAVE_PREHEADERS
> -                      | LOOPS_HAVE_RECORDED_EXITS);
> +  loop_optimizer_init (AVOID_CFG_MODIFICATIONS);
>    if (number_of_loops (cfun) <=3D 1)
>      {
>        loop_optimizer_finalize ();
>=20
> works.
Unfortunately, this brokes the whole SMS workflow.  See e.g. loop_canon_p
function and a call to single_exit inside.  I've actually tried only improv=
ed
(with all my patches) master version and only few examples, but with
AVOID_CFG_MODIFICATIONS some of them bailout with "SMS loop many exits" ins=
tead
of succesfully passing analysis and transformation phases with "SMS succeed=
ed".=