mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/* Multiple versions of memcpy.
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2017-2025 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#if IS_IN (libc)
|
|
/* Redefine memcpy so that the compiler won't complain about the type
|
|
mismatch with the IFUNC selector in strong_alias, below. */
|
|
# undef memcpy
|
|
# define memcpy __redirect_memcpy
|
|
# include <stdint.h>
|
|
# include <string.h>
|
|
# include <ifunc-init.h>
|
|
# include <riscv-ifunc.h>
|
|
# include <sys/hwprobe.h>
|
|
|
|
extern __typeof (__redirect_memcpy) __libc_memcpy;
|
|
|
|
extern __typeof (__redirect_memcpy) __memcpy_generic attribute_hidden;
|
|
extern __typeof (__redirect_memcpy) __memcpy_noalignment attribute_hidden;
|
|
|
|
static inline __typeof (__redirect_memcpy) *
|
|
select_memcpy_ifunc (uint64_t dl_hwcap, __riscv_hwprobe_t hwprobe_func)
|
|
{
|
|
unsigned long long int v;
|
|
if (__riscv_hwprobe_one (hwprobe_func, RISCV_HWPROBE_KEY_CPUPERF_0, &v) == 0
|
|
&& (v & RISCV_HWPROBE_MISALIGNED_MASK) == RISCV_HWPROBE_MISALIGNED_FAST)
|
|
return __memcpy_noalignment;
|
|
|
|
return __memcpy_generic;
|
|
}
|
|
|
|
riscv_libc_ifunc (__libc_memcpy, select_memcpy_ifunc);
|
|
|
|
# undef memcpy
|
|
strong_alias (__libc_memcpy, memcpy);
|
|
# ifdef SHARED
|
|
__hidden_ver1 (memcpy, __GI_memcpy, __redirect_memcpy)
|
|
__attribute__ ((visibility ("hidden"))) __attribute_copy__ (memcpy);
|
|
# endif
|
|
#else
|
|
# include <string/memcpy.c>
|
|
#endif
|