glibc/sysdeps/i386/memset.c
Roland McGrath 2826ac7e14 * sysdeps/alpha/fpu/s_cacosf.c: Don't use sysdeps/generic/.
* sysdeps/alpha/fpu/s_cacoshf.c: Likewise.
	* sysdeps/alpha/fpu/s_casinf.c: Likewise.
	* sysdeps/alpha/fpu/s_casinhf.c: Likewise.
	* sysdeps/alpha/fpu/s_catanf.c: Likewise.
	* sysdeps/alpha/fpu/s_catanhf.c: Likewise.
	* sysdeps/alpha/fpu/s_ccosf.c: Likewise.
	* sysdeps/alpha/fpu/s_ccoshf.c: Likewise.
	* sysdeps/alpha/fpu/s_cexpf.c: Likewise.
	* sysdeps/alpha/fpu/s_clog10f.c: Likewise.
	* sysdeps/alpha/fpu/s_clogf.c: Likewise.
	* sysdeps/alpha/fpu/s_cpowf.c: Likewise.
	* sysdeps/alpha/fpu/s_cprojf.c: Likewise.
	* sysdeps/alpha/fpu/s_csinf.c: Likewise.
	* sysdeps/alpha/fpu/s_csinhf.c: Likewise.
	* sysdeps/alpha/fpu/s_csqrtf.c: Likewise.
	* sysdeps/alpha/fpu/s_ctanf.c: Likewise.
	* sysdeps/alpha/fpu/s_ctanhf.c: Likewise.
	* sysdeps/alpha/libc-tls.c: Likewise.
	* sysdeps/gnu/glob64.c: Likewise.
	* sysdeps/gnu/updwtmp.c: Likewise.
	* sysdeps/gnu/utmp_file.c: Likewise.
	* sysdeps/i386/bzero.c: Likewise.
	* sysdeps/i386/ffs.c: Likewise.
	* sysdeps/i386/i686/ffs.c: Likewise.
	* sysdeps/i386/memset.c: Likewise.
	* sysdeps/ia64/fpu/printf_fphex.c: Likewise.
	* sysdeps/ia64/libc-tls.c: Likewise.
	* sysdeps/ieee754/ldbl-128/printf_fphex.c: Likewise.
	* sysdeps/m68k/ffs.c: Likewise.
	* sysdeps/mach/hurd/getdents.c: Likewise.
	* sysdeps/mach/hurd/init-posix.c: Likewise.
	* sysdeps/mach/msync.c: Likewise.
	* sysdeps/mips/libc-tls.c: Likewise.
	* sysdeps/posix/profil.c: Likewise.
	* sysdeps/posix/shm_open.c: Likewise.
	* sysdeps/posix/shm_unlink.c: Likewise.
	* sysdeps/posix/sprofil.c: Likewise.
	* sysdeps/powerpc/ffs.c: Likewise.
	* sysdeps/rs6000/ffs.c: Likewise.
	* sysdeps/s390/libc-tls.c: Likewise.
	* sysdeps/unix/sysv/linux/aio_sigqueue.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/glob.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/wordexp.c: Likewise.
	* sysdeps/unix/sysv/linux/ftruncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/gai_sigqueue.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/getmsg.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/getresgid.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/getresuid.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/lchown.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/putmsg.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/setresgid.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/setresuid.c: Likewise.
	* sysdeps/unix/sysv/linux/ia64/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/ftruncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_close.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_getattr.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_notify.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_open.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_receive.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_send.c: Likewise.
	* sysdeps/unix/sysv/linux/mq_unlink.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/ftruncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/sched_getaffinity.c: Likewise.
	* sysdeps/unix/sysv/linux/sched_setaffinity.c: Likewise.
	* sysdeps/unix/sysv/linux/sigqueue.c: Likewise.
	* sysdeps/unix/sysv/linux/sigstack.c: Likewise.
	* sysdeps/unix/sysv/linux/sigtimedwait.c: Likewise.
	* sysdeps/unix/sysv/linux/sigwaitinfo.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/readelflib.c: Likewise.
	* sysdeps/unix/sysv/linux/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/vfork.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/readelflib.c: Likewise.
2005-12-15 21:13:14 +00:00

87 lines
2.5 KiB
C

/* Set a block of memory to some byte value.
For Intel 80x86, x>=3.
Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <string.h>
#include <memcopy.h>
#ifdef __GNUC__
#undef memset
void *
memset (void *dstpp, int c, size_t len)
{
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 = (unsigned char) c;
/* Clear the direction flag, so filling will move forward. */
asm volatile("cld");
/* This threshold value is optimal. */
if (len >= 12)
{
/* Fill X with four copies of the char we want to fill with. */
x |= (x << 8);
x |= (x << 16);
/* 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), "1" (len), "a" (x) :
"memory");
return dstpp;
}
libc_hidden_builtin_def (memset)
#else
#include <string/memset.c>
#endif