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Diffstat (limited to 'sysdeps/i386/strspn.S')
| -rw-r--r-- | sysdeps/i386/strspn.S | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/sysdeps/i386/strspn.S b/sysdeps/i386/strspn.S deleted file mode 100644 index d433eb6af5..0000000000 --- a/sysdeps/i386/strspn.S +++ /dev/null @@ -1,240 +0,0 @@ -/* 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) 1994-2017 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) |