diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/i686/memset.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/i686/memset.S | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/i686/memset.S b/REORG.TODO/sysdeps/i386/i686/memset.S new file mode 100644 index 0000000000..24d06178d2 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/i686/memset.S @@ -0,0 +1,100 @@ +/* memset/bzero -- set memory area to CH/0 + Highly optimized version for ix86, x>=6. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. + + 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> +#include "asm-syntax.h" + +#define PARMS 4+4 /* space for 1 saved reg */ +#ifdef USE_AS_BZERO +# define DEST PARMS +# define LEN DEST+4 +#else +# define RTN PARMS +# define DEST RTN +# define CHR DEST+4 +# define LEN CHR+4 +#endif + + .text +#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO +ENTRY_CHK (__memset_chk) + movl 12(%esp), %eax + cmpl %eax, 16(%esp) + jb HIDDEN_JUMPTARGET (__chk_fail) +END_CHK (__memset_chk) +#endif +ENTRY (memset) + + cld + pushl %edi + cfi_adjust_cfa_offset (4) + movl DEST(%esp), %edx + movl LEN(%esp), %ecx +#ifdef USE_AS_BZERO + xorl %eax, %eax /* fill with 0 */ +#else + movzbl CHR(%esp), %eax +#endif + jecxz 1f + movl %edx, %edi + cfi_rel_offset (edi, 0) + andl $3, %edx + jz 2f /* aligned */ + jp 3f /* misaligned at 3, store just one byte below */ + stosb /* misaligned at 1 or 2, store two bytes */ + decl %ecx + jz 1f +3: stosb + decl %ecx + jz 1f + xorl $1, %edx + jnz 2f /* was misaligned at 2 or 3, now aligned */ + stosb /* was misaligned at 1, store third byte */ + decl %ecx +2: movl %ecx, %edx + shrl $2, %ecx + andl $3, %edx +#ifndef USE_AS_BZERO + imul $0x01010101, %eax +#endif + rep + stosl + movl %edx, %ecx + rep + stosb + +1: +#ifndef USE_AS_BZERO + movl DEST(%esp), %eax /* start address of destination is result */ +#endif + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + + ret +END (memset) +libc_hidden_builtin_def (memset) + +#if defined SHARED && IS_IN (libc) && !defined __memset_chk \ + && !defined USE_AS_BZERO +strong_alias (__memset_chk, __memset_zero_constant_len_parameter) + .section .gnu.warning.__memset_zero_constant_len_parameter + .string "memset used with constant zero length parameter; this could be due to transposed parameters" +#endif |