diff options
| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:42 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 4862d546c04bd2caf496d48335a546c0a44ad4a5 (patch) | |
| tree | 3e8bbae532c3dcc5ff93dde172500467aaaaf1f5 /sysdeps/x86_64 | |
| parent | eb9291aaa6ff6af158a1436b881ef8b834559621 (diff) | |
| download | glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.zip glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.tar.gz glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.tar.bz2 | |
x86: Use dl-symbol-redir-ifunc.h on cpu-tunables
The dl-symbol-redir-ifunc.h redirects compiler-generated libcalls to
arch-specific memory implementations to avoid ifunc calls where it is not
yet possible. The memcmp-isa-default-impl.h aims to fix the same issue
by calling the specific memset implementation directly.
Using the memcmp symbol directly allows the compiler to inline the memset
calls (especially because _dl_tunable_set_hwcaps uses constants values),
generating better code.
Checked on x86_64-linux-gnu.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/memcmp-isa-default-impl.h | 28 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h | 15 |
2 files changed, 15 insertions, 28 deletions
diff --git a/sysdeps/x86_64/memcmp-isa-default-impl.h b/sysdeps/x86_64/memcmp-isa-default-impl.h deleted file mode 100644 index 0962e83..0000000 --- a/sysdeps/x86_64/memcmp-isa-default-impl.h +++ /dev/null @@ -1,28 +0,0 @@ -/* Set default memcmp impl based on ISA level. - Copyright (C) 2022-2023 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/>. */ - -#include <isa-level.h> -#if MINIMUM_X86_ISA_LEVEL == 1 || MINIMUM_X86_ISA_LEVEL == 2 -# define DEFAULT_MEMCMP __memcmp_sse2 -#elif MINIMUM_X86_ISA_LEVEL == 3 -# define DEFAULT_MEMCMP __memcmp_avx2_movbe -#elif MINIMUM_X86_ISA_LEVEL == 4 -# define DEFAULT_MEMCMP __memcmp_evex_movbe -#else -# error "Unknown default memcmp implementation" -#endif diff --git a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h index 3fe73ca..c7d8961 100644 --- a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h @@ -19,6 +19,8 @@ #ifndef _DL_IFUNC_GENERIC_H #define _DL_IFUNC_GENERIC_H +#ifndef SHARED + #include <isa-level.h> #if MINIMUM_X86_ISA_LEVEL >= 4 @@ -31,4 +33,17 @@ asm ("memset = " HAVE_MEMSET_IFUNC_GENERIC); + +#if MINIMUM_X86_ISA_LEVEL >= 4 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_evex_movbe" +#elif MINIMUM_X86_ISA_LEVEL == 3 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_avx2_movbe" +#else +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_sse2" +#endif + +asm ("memcmp = " HAVE_MEMCMP_IFUNC_GENERIC); + +#endif /* SHARED */ + #endif |