mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 10:50:07 +00:00
f360f94a05
The optimization is achieved by following techniques:
> data alignment [gain from aligned memory access on read/write]
> POWER7 gains performance with loop unrolling/unwinding
[gain by reduction of branch penalty].
> zero padding done by calling optimized memset
43 lines
1.4 KiB
ArmAsm
43 lines
1.4 KiB
ArmAsm
/* Optimized strncpy implementation for POWER7.
|
|
Copyright (C) 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 <sysdep.h>
|
|
|
|
#undef EALIGN
|
|
#define EALIGN(name, alignt, words) \
|
|
.section ".text"; \
|
|
ENTRY_2(__strncpy_power7) \
|
|
.align ALIGNARG(alignt); \
|
|
EALIGN_W_##words; \
|
|
BODY_LABEL(__strncpy_power7): \
|
|
cfi_startproc; \
|
|
LOCALENTRY(__strncpy_power7)
|
|
|
|
#undef END
|
|
#define END(name) \
|
|
cfi_endproc; \
|
|
TRACEBACK(__strncpy_power7) \
|
|
END_2(__strncpy_power7)
|
|
|
|
#undef libc_hidden_builtin_def
|
|
#define libc_hidden_builtin_def(name)
|
|
|
|
#define MEMSET __memset_power7
|
|
|
|
#include <sysdeps/powerpc/powerpc64/power7/strncpy.S>
|