glibc/sysdeps/i386/i586/memcopy.h
Roland McGrath 8f5ca04bc7 Sat Oct 14 02:52:36 1995 Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>
* malloc/malloc.c (_malloc_internal): Performance fix.  Move
	if statement out of loop.

	* stdio/_itoa.c, stdio/_itoa.h: Complete rewrite.  Much faster
	implementation using GMP functions.  Contributed by
	Torbjorn Granlund and Ulrich Drepper.

	* stdio/test_rdwr.c: Include <errno.h>.

	* sysdeps/i386/i586/Implies: New file.

	New highly optimized string functions for i[345]86.
	* sysdeps/i386/memchr.S, sysdeps/i386/memcmp.S: New files.
        * sysdeps/i386/stpcpy.S, sysdeps/i386/stpncpy.S: New files.
        * sysdeps/i386/strchr.S, sysdeps/i386/strcspn.S: New files.
        * sysdeps/i386/strpbrk.S, sysdeps/i386/strrchr.S: New files.
        * sysdeps/i386/strspn.S, sysdeps/i386/i486/strcat.S: New files.
        * sysdeps/i386/i486/strlen.S, sysdeps/i386/i586/strchr.S: New files.
        * sysdeps/i386/i586/strlen.S: New file.
	* sysdeps/i386/memchr.c: Removed.  There is now an assembler version.

	* sysdeps/i386/i586/memcopy.h (WORD_COPY_BWD): Parameters did
	not correspond to used values.

	* sysdeps/unix/sysv/linux/nfs/nfs.h: New file.  Simply a wrapper
        around a kernel header file.
	* sysdeps/unix/sysv/linux/Dist: Add it.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir)=sunrpc] (headers):
	Likewise.

	* sysdeps/unix/sysv/linux/local_lim.h: Rewrite.  Instead of
        defining ourself we use a kernel header file.

	* sysdeps/unix/sysv/linux/i386/sysdep.h (DO_CALL): Optimize system
        call handler for i586.

	* sysdeps/unix/sysv/linux/sys/param.h: Add copyright and clean up.
Sat Oct 14 02:52:36 1995  Ulrich Drepper  <drepper@ipd.info.uni-karlsruhe.de>

	* malloc/malloc.c (_malloc_internal): Performance fix.  Move
	if statement out of loop.

	* stdio/_itoa.c, stdio/_itoa.h: Complete rewrite.  Much faster
	implementation using GMP functions.  Contributed by
	Torbjorn Granlund and Ulrich Drepper.

	* stdio/test_rdwr.c: Include <errno.h>.

	* sysdeps/i386/i586/Implies: New file.

	New highly optimized string functions for i[345]86.
	* sysdeps/i386/memchr.S, sysdeps/i386/memcmp.S: New files.
        * sysdeps/i386/stpcpy.S, sysdeps/i386/stpncpy.S: New files.
        * sysdeps/i386/strchr.S, sysdeps/i386/strcspn.S: New files.
        * sysdeps/i386/strpbrk.S, sysdeps/i386/strrchr.S: New files.
        * sysdeps/i386/strspn.S, sysdeps/i386/i486/strcat.S: New files.
        * sysdeps/i386/i486/strlen.S, sysdeps/i386/i586/strchr.S: New files.
        * sysdeps/i386/i586/strlen.S: New file.
	* sysdeps/i386/memchr.c: Removed.  There is now an assembler version.

	* sysdeps/i386/i586/memcopy.h (WORD_COPY_BWD): Parameters did
	not correspond to used values.

	* sysdeps/unix/sysv/linux/nfs/nfs.h: New file.  Simply a wrapper
        around a kernel header file.
	* sysdeps/unix/sysv/linux/Dist: Add it.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir)=sunrpc] (headers):
	Likewise.

	* sysdeps/unix/sysv/linux/local_lim.h: Rewrite.  Instead of
        defining ourself we use a kernel header file.

	* sysdeps/unix/sysv/linux/i386/sysdep.h (DO_CALL): Optimize system
        call handler for i586.

	* sysdeps/unix/sysv/linux/sys/param.h: Add copyright and clean up.
1995-10-16 01:37:51 +00:00

95 lines
3.2 KiB
C

/* memcopy.h -- definitions for memory copy functions. Pentium version.
Copyright (C) 1994, 1995 Free Software Foundation, Inc.
Contributed by Torbjorn Granlund (tege@sics.se).
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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* Get the i386 definitions. We will override some of them below. */
#include_next <memcopy.h>
/* Written like this, the Pentium pipeline can execute the loop at a
sustained rate of 2 instructions/clock, or asymptotically 480
Mbytes/second at 60Mhz. */
#undef WORD_COPY_FWD
#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
do \
{ \
asm volatile ("subl $32,%2\n" \
"js 2f\n" \
"1:\n" \
"movl 0(%1),%%eax\n" \
"movl 4(%1),%%edx\n" \
"movl %%eax,0(%0)\n" \
"movl %%edx,4(%0)\n" \
"movl 8(%1),%%eax\n" \
"movl 12(%1),%%edx\n" \
"movl %%eax,8(%0)\n" \
"movl %%edx,12(%0)\n" \
"movl 16(%1),%%eax\n" \
"movl 20(%1),%%edx\n" \
"movl %%eax,16(%0)\n" \
"movl %%edx,20(%0)\n" \
"movl 24(%1),%%eax\n" \
"movl 28(%1),%%edx\n" \
"movl %%eax,24(%0)\n" \
"movl %%edx,28(%0)\n" \
"addl $32,%1\n" \
"addl $32,%0\n" \
"subl $32,%2\n" \
"jns 1b\n" \
"2: addl $32,%2" : \
"=r" (dst_bp), "=r" (src_bp), "=r" (nbytes_left) : \
"0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
"ax", "dx"); \
} while (0)
#undef WORD_COPY_BWD
#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
do \
{ \
asm volatile ("subl $32,%2\n" \
"js 2f\n" \
"1:\n" \
"movl -4(%1),%%eax\n" \
"movl -8(%1),%%edx\n" \
"movl %%eax,-4(%0)\n" \
"movl %%edx,-8(%0)\n" \
"movl -12(%1),%%eax\n" \
"movl -16(%1),%%edx\n" \
"movl %%eax,-12(%0)\n" \
"movl %%edx,-16(%0)\n" \
"movl -20(%1),%%eax\n" \
"movl -24(%1),%%edx\n" \
"movl %%eax,-20(%0)\n" \
"movl %%edx,-24(%0)\n" \
"movl -28(%1),%%eax\n" \
"movl -32(%1),%%edx\n" \
"movl %%eax,-28(%0)\n" \
"movl %%edx,-32(%0)\n" \
"subl $32,%1\n" \
"subl $32,%0\n" \
"subl $32,%2\n" \
"jns 1b\n" \
"2: addl $32,%2" : \
"=r" (dst_ep), "=r" (src_ep), "=r" (nbytes_left) : \
"0" (dst_ep), "1" (src_ep), "2" (nbytes) : \
"ax", "dx"); \
} while (0)