[Bug target/115478] [15 Regression] gcc.target/aarch64/bitint-args.c fails since r15-1120-g2277f987979445

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115478

--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jeff Law <law@gcc.gnu.org>:

https://gcc.gnu.org/g:71f6540fc54036cc8f71db497cc22816f794549a

commit r15-7483-g71f6540fc54036cc8f71db497cc22816f794549a
Author: Jeff Law <jlaw@ventanamicro.com>
Date:   Tue Feb 11 16:55:03 2025 -0700

    [PR target/115478] Accept ADD, IOR or XOR when combining objects with no
bits in common

    So the change to prefer ADD over IOR for combining two objects with no bits
in
    common is (IMHO) generally good.  It has some minor fallout.

    In particular the aarch64 port (and I suspect others) have patterns that
    recognize IOR, but not PLUS or XOR for these cases and thus tests which
    expected to optimize with IOR are no longer optimizing.

    Roger suggested using a code iterator for this purpose.  Richard S.
suggested a
    new match operator to cover those cases.

    I really like the match operator idea, but as Richard S. notes in the PR it
    would require either not validating the "no bits in common", which
dramatically
    reduces the utility IMHO or we'd need some work to allow consistent results
    without polluting the nonzero bits cache.

    So this patch goes back to Roger's idea of just using a match iterator in
the
    aarch64 backend (and presumably anywhere else we see this popping up).

    Bootstrapped and regression tested on aarch64-linux-gnu where it fixes
    bitint-args.c (as expected).

            PR target/115478
    gcc/
            * config/aarch64/iterators.md (any_or_plus): New code iterator.
            * config/aarch64/aarch64.md (extr<mode>5_insn): Use any_or_plus.
            (extr<mode>5_insn_alt, extrsi5_insn_uxtw): Likewise.
            (extrsi5_insn_uxtw_alt, extrsi5_insn_di): Likewise.

    gcc/testsuite/
            * gcc.target/aarch64/bitint-args.c: Update expected output.