mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
05f3633da4
In this patch we take advantage of HSW memory bandwidth, manage to reduce miss branch prediction by avoiding using branch instructions and force destination to be aligned with avx instruction. The CPU2006 403.gcc benchmark indicates this patch improves performance from 2% to 10%.
272 lines
10 KiB
C
272 lines
10 KiB
C
/* Enumerate available IFUNC implementations of a function. x86-64 version.
|
|
Copyright (C) 2012-2014 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 <assert.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include <ifunc-impl-list.h>
|
|
#include "init-arch.h"
|
|
|
|
/* Maximum number of IFUNC implementations. */
|
|
#define MAX_IFUNC 4
|
|
|
|
/* Fill ARRAY of MAX elements with IFUNC implementations for function
|
|
NAME supported on target machine and return the number of valid
|
|
entries. */
|
|
|
|
size_t
|
|
__libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
|
|
size_t max)
|
|
{
|
|
assert (max >= MAX_IFUNC);
|
|
|
|
size_t i = 0;
|
|
|
|
/* Support sysdeps/x86_64/multiarch/memcmp.S. */
|
|
IFUNC_IMPL (i, name, memcmp,
|
|
IFUNC_IMPL_ADD (array, i, memcmp, HAS_SSE4_1,
|
|
__memcmp_sse4_1)
|
|
IFUNC_IMPL_ADD (array, i, memcmp, HAS_SSSE3, __memcmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/memmove_chk.S. */
|
|
IFUNC_IMPL (i, name, __memmove_chk,
|
|
IFUNC_IMPL_ADD (array, i, __memmove_chk, HAS_AVX,
|
|
__memmove_chk_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, __memmove_chk, HAS_SSSE3,
|
|
__memmove_chk_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, __memmove_chk, HAS_SSSE3,
|
|
__memmove_chk_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, __memmove_chk, 1,
|
|
__memmove_chk_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/memmove.S. */
|
|
IFUNC_IMPL (i, name, memmove,
|
|
IFUNC_IMPL_ADD (array, i, memmove, HAS_AVX,
|
|
__memmove_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, memmove, HAS_SSSE3,
|
|
__memmove_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, memmove, HAS_SSSE3,
|
|
__memmove_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_sse2))
|
|
|
|
#ifdef HAVE_AVX2_SUPPORT
|
|
/* Support sysdeps/x86_64/multiarch/memset_chk.S. */
|
|
IFUNC_IMPL (i, name, __memset_chk,
|
|
IFUNC_IMPL_ADD (array, i, __memset_chk, 1, __memset_chk_sse2)
|
|
IFUNC_IMPL_ADD (array, i, __memset_chk, HAS_AVX2,
|
|
__memset_chk_avx2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/memset.S. */
|
|
IFUNC_IMPL (i, name, memset,
|
|
IFUNC_IMPL_ADD (array, i, memset, 1, __memset_sse2)
|
|
IFUNC_IMPL_ADD (array, i, memset, HAS_AVX2, __memset_avx2))
|
|
#endif
|
|
|
|
/* Support sysdeps/x86_64/multiarch/stpncpy.S. */
|
|
IFUNC_IMPL (i, name, stpncpy,
|
|
IFUNC_IMPL_ADD (array, i, stpncpy, HAS_SSSE3,
|
|
__stpncpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, stpncpy, 1,
|
|
__stpncpy_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, stpncpy, 1, __stpncpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/stpcpy.S. */
|
|
IFUNC_IMPL (i, name, stpcpy,
|
|
IFUNC_IMPL_ADD (array, i, stpcpy, HAS_SSSE3, __stpcpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, stpcpy, 1, __stpcpy_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, stpcpy, 1, __stpcpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcasecmp_l.S. */
|
|
IFUNC_IMPL (i, name, strcasecmp,
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp, HAS_AVX,
|
|
__strcasecmp_avx)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp, HAS_SSE4_2,
|
|
__strcasecmp_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp, HAS_SSSE3,
|
|
__strcasecmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp, 1, __strcasecmp_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcasecmp_l.S. */
|
|
IFUNC_IMPL (i, name, strcasecmp_l,
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp_l, HAS_AVX,
|
|
__strcasecmp_l_avx)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp_l, HAS_SSE4_2,
|
|
__strcasecmp_l_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp_l, HAS_SSSE3,
|
|
__strcasecmp_l_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strcasecmp_l, 1,
|
|
__strcasecmp_l_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcasestr.c. */
|
|
IFUNC_IMPL (i, name, strcasestr,
|
|
IFUNC_IMPL_ADD (array, i, strcasestr, 1, __strcasestr_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcat.S. */
|
|
IFUNC_IMPL (i, name, strcat,
|
|
IFUNC_IMPL_ADD (array, i, strcat, HAS_SSSE3, __strcat_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strcat, 1, __strcat_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strcat, 1, __strcat_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strchr.S. */
|
|
IFUNC_IMPL (i, name, strchr,
|
|
IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2_no_bsf)
|
|
IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcmp.S. */
|
|
IFUNC_IMPL (i, name, strcmp,
|
|
IFUNC_IMPL_ADD (array, i, strcmp, HAS_SSE4_2, __strcmp_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strcmp, HAS_SSSE3, __strcmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strcmp, 1, __strcmp_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strcmp, 1, __strcmp_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcpy.S. */
|
|
IFUNC_IMPL (i, name, strcpy,
|
|
IFUNC_IMPL_ADD (array, i, strcpy, HAS_SSSE3, __strcpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strcpy, 1, __strcpy_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strcpy, 1, __strcpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strcspn.S. */
|
|
IFUNC_IMPL (i, name, strcspn,
|
|
IFUNC_IMPL_ADD (array, i, strcspn, HAS_SSE4_2,
|
|
__strcspn_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strcspn, 1, __strcspn_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strncase_l.S. */
|
|
IFUNC_IMPL (i, name, strncasecmp,
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp, HAS_AVX,
|
|
__strncasecmp_avx)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp, HAS_SSE4_2,
|
|
__strncasecmp_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp, HAS_SSSE3,
|
|
__strncasecmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp, 1,
|
|
__strncasecmp_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strncase_l.S. */
|
|
IFUNC_IMPL (i, name, strncasecmp_l,
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp_l, HAS_AVX,
|
|
__strncasecmp_l_avx)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp_l, HAS_SSE4_2,
|
|
__strncasecmp_l_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp_l, HAS_SSSE3,
|
|
__strncasecmp_l_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strncasecmp_l, 1,
|
|
__strncasecmp_l_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strncat.S. */
|
|
IFUNC_IMPL (i, name, strncat,
|
|
IFUNC_IMPL_ADD (array, i, strncat, HAS_SSSE3,
|
|
__strncat_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strncat, 1,
|
|
__strncat_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strncat, 1, __strncat_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strncpy.S. */
|
|
IFUNC_IMPL (i, name, strncpy,
|
|
IFUNC_IMPL_ADD (array, i, strncpy, HAS_SSSE3,
|
|
__strncpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strncpy, 1,
|
|
__strncpy_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strncpy, 1, __strncpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strpbrk.S. */
|
|
IFUNC_IMPL (i, name, strpbrk,
|
|
IFUNC_IMPL_ADD (array, i, strpbrk, HAS_SSE4_2,
|
|
__strpbrk_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strpbrk, 1, __strpbrk_sse2))
|
|
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strspn.S. */
|
|
IFUNC_IMPL (i, name, strspn,
|
|
IFUNC_IMPL_ADD (array, i, strspn, HAS_SSE4_2, __strspn_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strspn, 1, __strspn_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strstr.c. */
|
|
IFUNC_IMPL (i, name, strstr,
|
|
IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/wcscpy.S. */
|
|
IFUNC_IMPL (i, name, wcscpy,
|
|
IFUNC_IMPL_ADD (array, i, wcscpy, HAS_SSSE3, __wcscpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, wcscpy, 1, __wcscpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/wmemcmp.S. */
|
|
IFUNC_IMPL (i, name, wmemcmp,
|
|
IFUNC_IMPL_ADD (array, i, wmemcmp, HAS_SSE4_1,
|
|
__wmemcmp_sse4_1)
|
|
IFUNC_IMPL_ADD (array, i, wmemcmp, HAS_SSSE3,
|
|
__wmemcmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, wmemcmp, 1, __wmemcmp_sse2))
|
|
|
|
#ifdef SHARED
|
|
/* Support sysdeps/x86_64/multiarch/memcpy_chk.S. */
|
|
IFUNC_IMPL (i, name, __memcpy_chk,
|
|
IFUNC_IMPL_ADD (array, i, __memcpy_chk, HAS_AVX,
|
|
__memcpy_chk_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, __memcpy_chk, HAS_SSSE3,
|
|
__memcpy_chk_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, __memcpy_chk, HAS_SSSE3,
|
|
__memcpy_chk_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, __memcpy_chk, 1,
|
|
__memcpy_chk_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/memcpy.S. */
|
|
IFUNC_IMPL (i, name, memcpy,
|
|
IFUNC_IMPL_ADD (array, i, memcpy, HAS_AVX,
|
|
__memcpy_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, memcpy, HAS_SSSE3,
|
|
__memcpy_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, memcpy, HAS_SSSE3, __memcpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_sse2_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/mempcpy_chk.S. */
|
|
IFUNC_IMPL (i, name, __mempcpy_chk,
|
|
IFUNC_IMPL_ADD (array, i, __mempcpy_chk, HAS_AVX,
|
|
__mempcpy_chk_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, __mempcpy_chk, HAS_SSSE3,
|
|
__mempcpy_chk_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, __mempcpy_chk, HAS_SSSE3,
|
|
__mempcpy_chk_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, __mempcpy_chk, 1,
|
|
__mempcpy_chk_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/mempcpy.S. */
|
|
IFUNC_IMPL (i, name, mempcpy,
|
|
IFUNC_IMPL_ADD (array, i, mempcpy, HAS_AVX,
|
|
__mempcpy_avx_unaligned)
|
|
IFUNC_IMPL_ADD (array, i, mempcpy, HAS_SSSE3,
|
|
__mempcpy_ssse3_back)
|
|
IFUNC_IMPL_ADD (array, i, mempcpy, HAS_SSSE3,
|
|
__mempcpy_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, mempcpy, 1, __mempcpy_sse2))
|
|
|
|
/* Support sysdeps/x86_64/multiarch/strncmp.S. */
|
|
IFUNC_IMPL (i, name, strncmp,
|
|
IFUNC_IMPL_ADD (array, i, strncmp, HAS_SSE4_2,
|
|
__strncmp_sse42)
|
|
IFUNC_IMPL_ADD (array, i, strncmp, HAS_SSSE3,
|
|
__strncmp_ssse3)
|
|
IFUNC_IMPL_ADD (array, i, strncmp, 1, __strncmp_sse2))
|
|
#endif
|
|
|
|
return i;
|
|
}
|