[Bug rtl-optimization/108999] Maybe LRA produce inaccurate hardware register occupancy information for subreg operand

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108999

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Vladimir Makarov <vmaka...@gcc.gnu.org>:

https://gcc.gnu.org/g:a6457974a1f443ab58d2334c02260299616c78b8

commit r13-6551-ga6457974a1f443ab58d2334c02260299616c78b8
Author: Vladimir N. Makarov <vmaka...@redhat.com>
Date:   Thu Mar 9 08:41:09 2023 -0500

    LRA: For clobbered regs use operand mode instead of the biggest mode

    LRA is too conservative in calculation of conflicts with clobbered regs by
    using the biggest access mode.  This results in failure of possible reg
    coalescing and worse code.  This patch solves the problem.

            PR rtl-optimization/108999

    gcc/ChangeLog:

            * lra-constraints.cc (process_alt_operands): Use operand modes for
            clobbered regs instead of the biggest access mode.

    gcc/testsuite/ChangeLog:

            * gcc.target/aarch64/pr108999.c: New.