70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* Copyright (C) 2012-2014 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU Atomic Library (libatomic).
|
|
|
|
Libatomic is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#if HAVE_IFUNC
|
|
#include <cpuid.h>
|
|
|
|
extern unsigned int libat_feat1_ecx HIDDEN;
|
|
extern unsigned int libat_feat1_edx HIDDEN;
|
|
|
|
#ifdef __x86_64__
|
|
# define IFUNC_COND_1 (libat_feat1_ecx & bit_CMPXCHG16B)
|
|
#else
|
|
# define IFUNC_COND_1 (libat_feat1_edx & bit_CMPXCHG8B)
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
# define IFUNC_NCOND(N) (N == 16)
|
|
#else
|
|
# define IFUNC_NCOND(N) (N == 8)
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
# undef MAYBE_HAVE_ATOMIC_CAS_16
|
|
# define MAYBE_HAVE_ATOMIC_CAS_16 IFUNC_COND_1
|
|
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_16
|
|
# define MAYBE_HAVE_ATOMIC_EXCHANGE_16 IFUNC_COND_1
|
|
# undef MAYBE_HAVE_ATOMIC_LDST_16
|
|
# define MAYBE_HAVE_ATOMIC_LDST_16 IFUNC_COND_1
|
|
# if IFUNC_ALT == 1
|
|
# undef HAVE_ATOMIC_CAS_16
|
|
# define HAVE_ATOMIC_CAS_16 1
|
|
# endif
|
|
#else
|
|
# undef MAYBE_HAVE_ATOMIC_CAS_8
|
|
# define MAYBE_HAVE_ATOMIC_CAS_8 IFUNC_COND_1
|
|
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_8
|
|
# define MAYBE_HAVE_ATOMIC_EXCHANGE_8 IFUNC_COND_1
|
|
# undef MAYBE_HAVE_ATOMIC_LDST_8
|
|
# define MAYBE_HAVE_ATOMIC_LDST_8 IFUNC_COND_1
|
|
# if IFUNC_ALT == 1
|
|
# undef HAVE_ATOMIC_CAS_8
|
|
# define HAVE_ATOMIC_CAS_8 1
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* HAVE_IFUNC */
|
|
|
|
#include_next <host-config.h>
|