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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103793] [12 Regression] ICE: in
 to_reg_br_prob_base, at profile-count.h:277 with -O3
 -fno-guess-branch-probability since r12-6086-gcd5ae148c47c6dee
Date: Wed, 22 Dec 2021 01:59:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103793

luoxhu at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |luoxhu at gcc dot g=
nu.org

--- Comment #2 from luoxhu at gcc dot gnu.org ---

Confirmed. -fno-guess-branch-probability requires the profile_count be
initialized, so add guard like this?


+       if (true_edge->probability.initialized_p ())
+         {
+           edge exit_to_latch1 =3D single_pred_edge (loop1->latch);
+           exit_to_latch1->probability
+             =3D exit_to_latch1->probability.apply_scale (
+               true_edge->probability.to_reg_br_prob_base (),
+               REG_BR_PROB_BASE);
+           single_exit (loop1)->probability
+             =3D exit_to_latch1->probability.invert ();
+         }=