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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, 29 Dec 2021 01:11:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103793

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Xiong Hu Luo <luoxhu@gcc.gnu.org>:

https://gcc.gnu.org/g:44372676e81358de29d5c853685a7664a95d8a96

commit r12-6140-g44372676e81358de29d5c853685a7664a95d8a96
Author: Xionghu Luo <luoxhu@linux.ibm.com>
Date:   Tue Dec 28 19:09:14 2021 -0600

    Fix ICE in lsplit when built with -O3 -fno-guess-branch-probability
[PR103793]

    no-guess-branch-probability option requires profile_count scaling with
    initialized_p guard, use multiply instead of apply_scale, which will do
    the right thing to undefined probabilities and will not cause unnecesary
    roundoff errors and precision info loss.
    Also merge the missed part of r12-6086 of factor out function to avoid
    duplicate code.

    Regression testest pass on Power and X86.

    gcc/ChangeLog:

            PR tree-optimization/103793
            * tree-ssa-loop-split.c (fix_loop_bb_probability): New function.
            (split_loop): Use multiply to scale loop1's exit probability.
            (do_split_loop_on_cond): Call fix_loop_bb_probability.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/103793
            * gcc.dg/pr103793.c: New test.=