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Subject: [Bug target/100182] [8/9/10/11/12 Regression] Miscompilation of
 atomic_float/1.cc and atomic_float/wait_notify.cc on i686
Date: Thu, 22 Apr 2021 13:10:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100182

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:0f4588141fcbe4e0f1fa12776b47200870f6c621

commit r12-60-g0f4588141fcbe4e0f1fa12776b47200870f6c621
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Apr 22 15:08:21 2021 +0200

    libstdc++: Add workaround for ia32 floating atomics miscompilations
[PR100184]

    gcc on ia32 miscompiles various atomics involving floating point,
    unfortunately I'm afraid it is too late to fix that for 11.1 and
    as I'm quite lost on it, it might take a while for 12 too
    (disabling all the 8 peephole2s would be easiest, but then we'd
    run into optimization regressions).

    While 1.cc just FAILs, with dejagnu 1.6.1 wait_notify.cc hangs the
    make check even after the timeout fires.  The following patch therefore
    xfails the former and skips the latter.

    Tested on x86_64-linux where
    make check RUNTESTFLAGS=3D'conformance.exp=3Datomic_float/*.cc'
    is still
                    =3D=3D=3D libstdc++ Summary =3D=3D=3D

     # of expected passes            8
    and on i686-linux, where it is now
                    =3D=3D=3D libstdc++ Summary =3D=3D=3D

     # of expected passes            5
     # of expected failures          1
     # of unsupported tests          1

    2021-04-22  Jakub Jelinek  <jakub@redhat.com>

            PR target/100182
            * testsuite/29_atomics/atomic_float/1.cc: Add dg-xfail-run-if f=
or
            ia32.
            * testsuite/29_atomics/atomic_float/wait_notify.cc: Add dg-skip=
-if
for
            ia32.=