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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/110786] bpf: make use of the V4 byte swap instructions
Date: Mon, 24 Jul 2023 09:02:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110786

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jose E. Marchesi <jemarch@gcc.gnu.org=
>:

https://gcc.gnu.org/g:f1e34551e4d6e259ab3bd0c9aba4fa1f0c448214

commit r14-2741-gf1e34551e4d6e259ab3bd0c9aba4fa1f0c448214
Author: Jose E. Marchesi <jose.marchesi@oracle.com>
Date:   Mon Jul 24 10:56:27 2023 +0200

    bpf: make use of the bswap{16,32,64} V4 BPF instruction

    This patch makes the BPF backend to use the new V4 bswap{16,32,64}
    instructions in order to implement the __builtin_bswap{16,32,64}
    built-ins.  It also adds support for -mcpu=3Dv4 and -m[no]bswap
    command-line options.  Tests and doc updates are includes.

    Tested in bpf-unknown-none.

    gcc/ChangeLog

            PR target/110786
            * config/bpf/bpf.opt (mcpu): Add ISA_V4 and make it the default.
            (mbswap): New option.
            * config/bpf/bpf-opts.h (enum bpf_isa_version): New value ISA_V=
4.
            * config/bpf/bpf.cc (bpf_option_override): Set bpf_has_bswap.
            * config/bpf/bpf.md: Use bswap instructions if available for
            bswap* insn, and fix constraint.
            * doc/invoke.texi (eBPF Options): Document -mcpu=3Dv4 and -mbsw=
ap.

    gcc/testsuite/ChangeLog

            PR target/110786
            * gcc.target/bpf/bswap-1.c: Pass -mcpu=3Dv3 to build test.
            * gcc.target/bpf/bswap-2.c: New test.=