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Subject: [Bug rtl-optimization/97421] aarch64: Wrong code with -O2
 -fmodulo-sched
Date: Sat, 05 Dec 2020 15:47:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97421

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roman Zhuykov <zhroma@gcc.gnu.org>:

https://gcc.gnu.org/g:4eb8f93d026eaa1de9b4820337069f3ce3465cd0

commit r11-5760-g4eb8f93d026eaa1de9b4820337069f3ce3465cd0
Author: Roman Zhuykov <zhroma@ispras.ru>
Date:   Sat Dec 5 18:45:27 2020 +0300

    modulo-sched: Carefully process loop counter initialization [PR97421]

    Do not allow direct adjustment of pre-header initialization instruction=
 for
    count register if is read in some instruction below in that basic block.

    gcc/ChangeLog:

            PR rtl-optimization/97421
            * modulo-sched.c (generate_prolog_epilog): Remove forward
            declaration, adjust last argument name and type.
            (const_iteration_count): Add bool pointer parameter to return
            whether count register is read in pre-header after its
            initialization.
            (sms_schedule): Fix count register initialization adjustment
            procedure according to what const_iteration_count said.

    gcc/testsuite/ChangeLog:

            PR rtl-optimization/97421
            * gcc.c-torture/execute/pr97421-1.c: New test.
            * gcc.c-torture/execute/pr97421-2.c: New test.
            * gcc.c-torture/execute/pr97421-3.c: New test.=