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authorRoland McGrath <roland@gnu.org>1995-10-16 01:37:51 +0000
committerRoland McGrath <roland@gnu.org>1995-10-16 01:37:51 +0000
commit8f5ca04bc7fd53741d80117df992995ace8f6d2d (patch)
treee39c13fc198b22ec55647259a8080051988e8c69 /sysdeps/i386/strpbrk.S
parent5d82cf5c55f56ae10d3b0a205d1fcc7de1cf56a0 (diff)
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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.
Diffstat (limited to 'sysdeps/i386/strpbrk.S')
-rw-r--r--sysdeps/i386/strpbrk.S177
1 files changed, 177 insertions, 0 deletions
diff --git a/sysdeps/i386/strpbrk.S b/sysdeps/i386/strpbrk.S
new file mode 100644
index 0000000000..245bf1a935
--- /dev/null
+++ b/sysdeps/i386/strpbrk.S
@@ -0,0 +1,177 @@
+/* strcspn (str, ss) -- Return the length of the initial segement of STR
+ which contains no characters from SS.
+For Intel 80x86, x>=3.
+Copyright (C) 1994, 1995 Free Software Foundation, Inc.
+Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>
+Bug fixes by Alan Modra <Alan@SPRI.Levels.UniSA.Edu.Au>
+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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+#include "asm-syntax.h"
+
+/*
+ INPUT PARAMETERS:
+ str (sp + 4)
+ stopset (sp + 8)
+*/
+
+ .text
+ENTRY (strpbrk)
+ movl 4(%esp), %edx /* get string pointer */
+ movl 8(%esp), %eax /* get stopset pointer */
+
+ /* First we create a table with flags for all possible characters.
+ For the ASCII (7bit/8bit) or ISO-8859-X character sets which are
+ supported by the C string functions we have 256 characters.
+ Before inserting marks for the stop characters we clear the whole
+ table. The unrolled form is much faster than a loop. */
+ xorl %ecx, %ecx /* %ecx = 0 !!! */
+
+ pushl %ecx /* make a 256 bytes long block filled with 0 */
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl %ecx
+ pushl $0 /* These immediate values make the label 2 */
+ pushl $0 /* to be aligned on a 16 byte boundary to */
+ pushl $0 /* get a better performance of the loop. */
+ pushl $0
+ pushl $0
+ pushl $0
+
+/* For understanding the following code remember that %ecx == 0 now.
+ Although all the following instruction only modify %cl we always
+ have a correct zero-extended 32-bit value in %ecx. */
+
+/* Don't change the "testb $0xff,%%cl" to "testb %%cl,%%cl". We want
+ longer instructions so that the next loop aligns without adding nops. */
+
+L2: movb (%eax), %cl /* get byte from stopset */
+ testb %cl, %cl /* is NUL char? */
+ jz L1 /* yes => start compare loop */
+ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
+
+ movb 1(%eax), %cl /* get byte from stopset */
+ testb $0xff, %cl /* is NUL char? */
+ jz L1 /* yes => start compare loop */
+ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
+
+ movb 2(%eax), %cl /* get byte from stopset */
+ testb $0xff, %cl /* is NUL char? */
+ jz L1 /* yes => start compare loop */
+ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
+
+ movb 3(%eax), %cl /* get byte from stopset */
+ addl $4, %eax /* increment stopset pointer */
+ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
+ testb $0xff, %cl /* is NUL char? */
+ jnz L2 /* no => process next dword from stopset */
+
+L1: leal -4(%edx), %eax /* prepare loop */
+
+ /* We use a neat trick for the following loop. Normally we would
+ have to test for two termination conditions
+ 1. a character in the stopset was found
+ and
+ 2. the end of the string was found
+ But as a sign that the chracter is in the stopset we store its
+ value in the table. But the value of NUL is NUL so the loop
+ terminates for NUL in every case. */
+
+L3: addl $4, %eax /* adjust pointer for full loop round */
+
+ movb (%eax), %cl /* get byte from string */
+ cmpb %cl, (%esp,%ecx) /* is it contained in stopset? */
+ je L4 /* yes => return */
+
+ movb 1(%eax), %cl /* get byte from string */
+ cmpb %cl, (%esp,%ecx) /* is it contained in stopset? */
+ je L5 /* yes => return */
+
+ movb 2(%eax), %cl /* get byte from string */
+ cmpb %cl, (%esp,%ecx) /* is it contained in stopset? */
+ je L6 /* yes => return */
+
+ movb 3(%eax), %cl /* get byte from string */
+ cmpb %cl, (%esp,%ecx) /* is it contained in stopset? */
+ jne L3 /* yes => return */
+
+ incl %eax /* adjust pointer */
+L6: incl %eax
+L5: incl %eax
+
+L4: addl $256, %esp /* remove stopset */
+
+ orb %cl, %cl /* was last character NUL? */
+ jnz L7 /* no => return pointer */
+ xorl %eax, %eax /* return NULL */
+
+L7: ret