[Bug rtl-optimization/100263] [11/12 Regression] RTL optimizers miscompile loop

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100263

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Stefan Schulze Frielinghaus
<stefansf@gcc.gnu.org>:

https://gcc.gnu.org/g:06d75273ff7bb7af72ae83abef858c079245b602

commit r8-10952-g06d75273ff7bb7af72ae83abef858c079245b602
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date:   Wed May 5 17:12:35 2021 +0200

    PR rtl-optimization/100263: Ensure register can change mode

    For move2add_valid_value_p we also have to ask the target whether a
    register can be accessed in a different mode than it was set before.

    gcc/ChangeLog:

            PR rtl-optimization/100263
            * postreload.c (move2add_valid_value_p): Ensure register can
            change mode.

    (cherry picked from commit bb283170e7a1f39bf533651418daf10ad18eccfc)