mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 20:21:07 +00:00
5f3d0b78e0
memcpy with unaligned 256-bit AVX register loads/stores are slow on older processorsl like Sandy Bridge. This patch adds bit_AVX_Fast_Unaligned_Load and sets it only when AVX2 is available. [BZ #17801] * sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): Set the bit_AVX_Fast_Unaligned_Load bit for AVX2. * sysdeps/x86_64/multiarch/init-arch.h (bit_AVX_Fast_Unaligned_Load): New. (index_AVX_Fast_Unaligned_Load): Likewise. (HAS_AVX_FAST_UNALIGNED_LOAD): Likewise. * sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Check the bit_AVX_Fast_Unaligned_Load bit instead of the bit_AVX_Usable bit. * sysdeps/x86_64/multiarch/memcpy_chk.S (__memcpy_chk): Likewise. * sysdeps/x86_64/multiarch/mempcpy.S (__mempcpy): Likewise. * sysdeps/x86_64/multiarch/mempcpy_chk.S (__mempcpy_chk): Likewise. * sysdeps/x86_64/multiarch/memmove.c (__libc_memmove): Replace HAS_AVX with HAS_AVX_FAST_UNALIGNED_LOAD. * sysdeps/x86_64/multiarch/memmove_chk.c (__memmove_chk): Likewise.
38 lines
1.5 KiB
C
38 lines
1.5 KiB
C
/* Multiple versions of __memmove_chk.
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2010-2015 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include "init-arch.h"
|
|
|
|
#define MEMMOVE_CHK __memmove_chk_sse2
|
|
|
|
extern __typeof (__memmove_chk) __memmove_chk_sse2 attribute_hidden;
|
|
extern __typeof (__memmove_chk) __memmove_chk_ssse3 attribute_hidden;
|
|
extern __typeof (__memmove_chk) __memmove_chk_ssse3_back attribute_hidden;
|
|
extern __typeof (__memmove_chk) __memmove_chk_avx_unaligned attribute_hidden;
|
|
|
|
#include "debug/memmove_chk.c"
|
|
|
|
libc_ifunc (__memmove_chk,
|
|
HAS_AVX_FAST_UNALIGNED_LOAD ? __memmove_chk_avx_unaligned :
|
|
(HAS_SSSE3
|
|
? (HAS_FAST_COPY_BACKWARD
|
|
? __memmove_chk_ssse3_back : __memmove_chk_ssse3)
|
|
: __memmove_chk_sse2));
|