mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
ceabdcd130
1. Add default ISA level selection in non-multiarch/rtld
implementations.
2. Add ISA level build guards to different implementations.
- I.e strcmp-avx2.S which is ISA level 3 will only build if
compiled ISA level <= 3. Otherwise there is no reason to
include it as we will always use one of the ISA level 4
implementations (strcmp-evex.S).
3. Refactor the ifunc selector and ifunc implementation list to use
the ISA level aware wrapper macros that allow functions below the
compiled ISA level (with a guranteed replacement) to be skipped.
Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}
And m32 with and without multiarch.
32 lines
1.3 KiB
ArmAsm
32 lines
1.3 KiB
ArmAsm
/* strcmp dispatch for RTLD and non-multiarch build
|
|
Copyright (C) 1999-2022 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/>. */
|
|
|
|
/* Symbol = strcmp. */
|
|
|
|
#define DEFAULT_IMPL_V1 "multiarch/strcmp-sse2.S"
|
|
/* strcmp-sse2-unaligned.S is often faster than strcmp-sse42.S and
|
|
doesn't have the drawback of using the `pcmpstri` instruction
|
|
which can be very slow on some CPUs. */
|
|
#define DEFAULT_IMPL_V2 "multiarch/strcmp-sse2-unaligned.S"
|
|
#define DEFAULT_IMPL_V3 "multiarch/strcmp-avx2.S"
|
|
#define DEFAULT_IMPL_V4 "multiarch/strcmp-evex.S"
|
|
|
|
#include "isa-default-impl.h"
|
|
|
|
libc_hidden_builtin_def (strcmp)
|