[Bug target/109040] [13 Regression] wrong code with v16hi compare & mask on riscv64 at -O2 since r13-4907-g2e886eef7f2b5a

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109040

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:76f44fbfea1f11e53d4b7e83f0debd029c94a1b3

commit r14-64-g76f44fbfea1f11e53d4b7e83f0debd029c94a1b3
Author: Jakub Jelinek <ja...@redhat.com>
Date:   Wed Apr 19 11:13:11 2023 +0200

    dse: Use SUBREG_REG for copy_to_mode_reg in DSE replace_read for
WORD_REGISTER_OPERATIONS targets [PR109040]

    While we've agreed this is not the right fix for the PR109040 bug,
    the patch clearly improves generated code (at least on the testcase from
the
    PR), so I'd like to propose this as optimization heuristics improvement
    for GCC 14.

    2023-04-19  Jakub Jelinek  <ja...@redhat.com>

            PR target/109040
            * dse.cc (replace_read): If read_reg is a SUBREG of a word mode
            REG, for WORD_REGISTER_OPERATIONS copy SUBREG_REG of it into
            a new REG rather than the SUBREG.