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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115478] [15 Regression] gcc.target/aarch64/bitint-args.c
 fails since r15-1120-g2277f987979445
Date: Mon, 24 Jun 2024 20:51:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115478

Richard Sandiford <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #5 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
How about adding a new match_operator predicate to common.md for this kind =
of
situation?  It would be nice if it could automatically detect when the two
operands have no nonzero bits in common, but doing that would need some
refactoring of the nonzero_bits code, to ensure that the predicate gives a
consistent result (and does that without polluting the current nonzero_bits
cache).

In the meantime, it might be enough to say that the insn must enforce the
non-overlapping bits check itself.=