[Bug target/97250] Implement -march=x86-64-v2, -march=x86-64-v3, -march=x86-64-v4 for x86-64

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:16664e6e4fb4281be6477c13989740d44c963c77

commit r11-3764-g16664e6e4fb4281be6477c13989740d44c963c77
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Oct 9 06:12:17 2020 -0700

    x86-64: Check CMPXCHG16B for x86-64-v[234]

    x86-64-v2 includes CMPXCHG16B.  Since -mcx16 enables CMPXCHG16B and
    defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16, check it in x86-64-v[234]
    tests.

            PR target/97250
            * gcc.target/i386/x86-64-v2.c: Verify that
            __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 is defined.
            * gcc.target/i386/x86-64-v3.c: Likewise.
            * gcc.target/i386/x86-64-v4.c: Likewise.