1 /* CPU strand yielding for busy loops. Linux/sparc64 version.
2 Copyright (C) 2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <sparc-ifunc.h>
22 __cpu_relax_generic (void)
24 asm volatile ("rd %ccr, %g0;"
30 __cpu_relax_pause (void)
32 asm volatile ("wr %g0, 128, %asr27");
35 sparc_libc_ifunc (__cpu_relax
,
36 hwcap
& HWCAP_SPARC_PAUSE
38 : __cpu_relax_generic
)