mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
241 lines
6.7 KiB
ArmAsm
241 lines
6.7 KiB
ArmAsm
/* strcspn (str, ss) -- Return the length of the initial segment of STR
|
|
which contains only characters from SS.
|
|
For Intel 80x86, x>=3.
|
|
Copyright (C) 1994-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>
|
|
Bug fixes by Alan Modra <Alan@SPRI.Levels.UniSA.Edu.Au>
|
|
|
|
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 /* no space for saved regs */
|
|
#define STR PARMS
|
|
#define SKIP STR+4
|
|
|
|
.text
|
|
ENTRY (strspn)
|
|
|
|
movl STR(%esp), %edx
|
|
movl SKIP(%esp), %eax
|
|
|
|
/* 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 */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* These immediate values make the label 2 */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* to be aligned on a 16 byte boundary to */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* get a better performance of the loop. */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
/* 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. */
|
|
|
|
L(2): movb (%eax), %cl /* get byte from stopset */
|
|
testb %cl, %cl /* is NUL char? */
|
|
jz L(1) /* 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 L(1) /* 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 L(1) /* 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 L(2) /* no => process next dword from stopset */
|
|
|
|
L(1): 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 character 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. */
|
|
|
|
L(3): addl $4, %eax /* adjust pointer for full loop round */
|
|
|
|
movb (%eax), %cl /* get byte from string */
|
|
testb %cl, (%esp,%ecx) /* is it contained in skipset? */
|
|
jz L(4) /* no => return */
|
|
|
|
movb 1(%eax), %cl /* get byte from string */
|
|
testb %cl, (%esp,%ecx) /* is it contained in skipset? */
|
|
jz L(5) /* no => return */
|
|
|
|
movb 2(%eax), %cl /* get byte from string */
|
|
testb %cl, (%esp,%ecx) /* is it contained in skipset? */
|
|
jz L(6) /* no => return */
|
|
|
|
movb 3(%eax), %cl /* get byte from string */
|
|
testb %cl, (%esp,%ecx) /* is it contained in skipset? */
|
|
jnz L(3) /* yes => start loop again */
|
|
|
|
incl %eax /* adjust pointer */
|
|
L(6): incl %eax
|
|
L(5): incl %eax
|
|
|
|
L(4): addl $256, %esp /* remove stopset */
|
|
cfi_adjust_cfa_offset (-256)
|
|
subl %edx, %eax /* we have to return the number of valid
|
|
characters, so compute distance to first
|
|
non-valid character */
|
|
ret
|
|
END (strspn)
|
|
libc_hidden_builtin_def (strspn)
|