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author | H.J. Lu <hjl.tools@gmail.com> | 2015-08-27 09:04:40 -0700 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2015-08-27 09:04:54 -0700 |
commit | d226114b9bfce2ea729f9c7b736aa5d509b2a73c (patch) | |
tree | 4076d4d6c1c6c3e112d417f85b036d10ceb79480 /sysdeps/i386/bzero.c | |
parent | 37430363b865f2423bd58b4f0eaa779845ed7e71 (diff) | |
download | glibc-d226114b9bfce2ea729f9c7b736aa5d509b2a73c.tar.gz glibc-d226114b9bfce2ea729f9c7b736aa5d509b2a73c.tar.xz glibc-d226114b9bfce2ea729f9c7b736aa5d509b2a73c.zip |
Add i386 memset and memcpy assembly functions
Add i386 memset and memcpy assembly functions with REP MOVSB/STOSB instructions. * sysdeps/i386/bcopy.S: New file. * sysdeps/i386/bzero.S: Likewise. * sysdeps/i386/memcpy.S: Likewise. * sysdeps/i386/memmove.S: Likewise. * sysdeps/i386/mempcpy.S: Likewise. * sysdeps/i386/memset.S: Likewise. * sysdeps/i386/bzero.c: Removed. * sysdeps/i386/memset.c: Likewise. * sysdeps/i386/i586/memcpy_chk.S: Likewise. * sysdeps/i386/i586/mempcpy_chk.S: Likewise. * sysdeps/i386/i586/memset_chk.S: Likewise. * sysdeps/i386/i686/memcpy_chk.S: Moved to ... * sysdeps/i386/memcpy_chk.S: Here. * sysdeps/i386/i686/memmove_chk.S: Moved to ... * sysdeps/i386/memmove_chk.S: Here. * sysdeps/i386/i686/mempcpy_chk.S: Moved to ... * sysdeps/i386/mempcpy_chk.S: Likewise. * sysdeps/i386/i686/memset_chk.S: Moved to ... * sysdeps/i386/memset_chk.S: Likewise.
Diffstat (limited to 'sysdeps/i386/bzero.c')
-rw-r--r-- | sysdeps/i386/bzero.c | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/sysdeps/i386/bzero.c b/sysdeps/i386/bzero.c deleted file mode 100644 index 1a89444a11..0000000000 --- a/sysdeps/i386/bzero.c +++ /dev/null @@ -1,82 +0,0 @@ -/* bzero -- set a block of memory to zero. For Intel 80x86, x>=3. - This file is part of the GNU C Library. - Copyright (C) 1991-2015 Free Software Foundation, Inc. - Contributed by Torbjorn Granlund (tege@sics.se). - - 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 <string.h> -#include <memcopy.h> - -#undef bzero -#undef __bzero - -#ifdef __GNUC__ - -void -__bzero (dstpp, len) - void *dstpp; - size_t len; -{ - /* N.B.: This code is almost verbatim from memset.c. */ - int d0; - unsigned long int dstp = (unsigned long int) dstpp; - - /* This explicit register allocation - improves code very much indeed. */ - register op_t x asm ("ax"); - - x = 0; - - /* Clear the direction flag, so filling will move forward. */ - asm volatile ("cld"); - - /* This threshold value is optimal. */ - if (len >= 12) - { - /* Adjust LEN for the bytes handled in the first loop. */ - len -= (-dstp) % OPSIZ; - - /* There are at least some bytes to set. - No need to test for LEN == 0 in this alignment loop. */ - - /* Fill bytes until DSTP is aligned on a longword boundary. */ - asm volatile ("rep\n" - "stosb" /* %0, %2, %3 */ : - "=D" (dstp), "=c" (d0) : - "0" (dstp), "1" ((-dstp) % OPSIZ), "a" (x) : - "memory"); - - /* Fill longwords. */ - asm volatile ("rep\n" - "stosl" /* %0, %2, %3 */ : - "=D" (dstp), "=c" (d0) : - "0" (dstp), "1" (len / OPSIZ), "a" (x) : - "memory"); - len %= OPSIZ; - } - - /* Write the last few bytes. */ - asm volatile ("rep\n" - "stosb" /* %0, %2, %3 */ : - "=D" (dstp), "=c" (d0) : - "0" (dstp), "c" (len), "a" (x) : - "memory"); -} -weak_alias (__bzero, bzero) - -#else -#include <string/bzero.c> -#endif |