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/* memset with REP MOVSB/STOSB
Copyright (C) 2015-2021 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 <sysdep.h>
#define CFI_PUSH(REG) \
cfi_adjust_cfa_offset (4); \
cfi_rel_offset (REG, 0)
#define CFI_POP(REG) \
cfi_adjust_cfa_offset (-4); \
cfi_restore (REG)
#define PUSH(REG) pushl REG; CFI_PUSH (REG)
#define POP(REG) popl REG; CFI_POP (REG)
#define STR1 8
#ifdef USE_AS_BZERO
#define N STR1+4
#else
#define STR2 STR1+4
#define N STR2+4
#endif
.text
#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
ENTRY (__memset_chk)
movl 12(%esp), %eax
cmpl %eax, 16(%esp)
jb HIDDEN_JUMPTARGET (__chk_fail)
END (__memset_chk)
#endif
ENTRY (memset)
PUSH (%edi)
movl N(%esp), %ecx
movl STR1(%esp), %edi
#ifdef USE_AS_BZERO
xor %eax, %eax
#else
movzbl STR2(%esp), %eax
mov %edi, %edx
#endif
rep stosb
#ifndef USE_AS_BZERO
mov %edx, %eax
#endif
POP (%edi)
ret
END (memset)
#ifndef USE_AS_BZERO
libc_hidden_builtin_def (memset)
#endif
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