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Subject: [Bug rtl-optimization/101260] [10/11/12 Regression] regcprop:
 Determine subreg offset depending on endianness
Date: Tue, 01 Feb 2022 12:35:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101260

--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andreas Krebbel <krebbel@gcc.gnu.org>:

https://gcc.gnu.org/g:b9ebf6c330e24e886e7ce148e8c680c3e06c24dc

commit r12-6960-gb9ebf6c330e24e886e7ce148e8c680c3e06c24dc
Author: Andreas Krebbel <krebbel@linux.ibm.com>
Date:   Tue Feb 1 13:33:55 2022 +0100

    PR101260 regcprop: Add mode change check for copy reg

    When propagating a multi-word register into an access with a smaller
    mode the can_change_mode backend hook is already consulted for the
    original register.  This however is also required for the intermediate
    copy in copy_regno which might use a different register class.

    gcc/ChangeLog:

            PR rtl-optimization/101260
            * regcprop.cc (maybe_mode_change): Invoke mode_change_ok also f=
or
            copy_regno.

    gcc/testsuite/ChangeLog:

            PR rtl-optimization/101260
            * gcc.target/s390/pr101260.c: New testcase.=