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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
120 lines
4.1 KiB
ArmAsm
120 lines
4.1 KiB
ArmAsm
/* strcspn (str, ss) -- Return the length of the initial segment of STR
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which contains no characters from SS.
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For AMD x86-64.
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Copyright (C) 1994-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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.text
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ENTRY (strcspn)
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movq %rdi, %rdx /* Save SRC. */
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/* First we create a table with flags for all possible characters.
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For the ASCII (7bit/8bit) or ISO-8859-X character sets which are
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supported by the C string functions we have 256 characters.
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Before inserting marks for the stop characters we clear the whole
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table. */
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movq %rdi, %r8 /* Save value. */
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subq $256, %rsp /* Make space for 256 bytes. */
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cfi_adjust_cfa_offset(256)
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movl $32, %ecx /* 32*8 bytes = 256 bytes. */
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movq %rsp, %rdi
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xorl %eax, %eax /* We store 0s. */
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cld
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rep
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stosq
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movq %rsi, %rax /* Setup skipset. */
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/* For understanding the following code remember that %rcx == 0 now.
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Although all the following instruction only modify %cl we always
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have a correct zero-extended 64-bit value in %rcx. */
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.p2align 4
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L(2): movb (%rax), %cl /* get byte from skipset */
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testb %cl, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in skipset table */
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movb 1(%rax), %cl /* get byte from skipset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in skipset table */
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movb 2(%rax), %cl /* get byte from skipset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in skipset table */
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movb 3(%rax), %cl /* get byte from skipset */
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addq $4, %rax /* increment skipset pointer */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in skipset table */
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testb $0xff, %cl /* is NUL char? */
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jnz L(2) /* no => process next dword from skipset */
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L(1): leaq -4(%rdx), %rax /* prepare loop */
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/* We use a neat trick for the following loop. Normally we would
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have to test for two termination conditions
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1. a character in the skipset was found
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and
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2. the end of the string was found
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But as a sign that the character is in the skipset we store its
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value in the table. But the value of NUL is NUL so the loop
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terminates for NUL in every case. */
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.p2align 4
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L(3): addq $4, %rax /* adjust pointer for full loop round */
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movb (%rax), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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je L(4) /* yes => return */
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movb 1(%rax), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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je L(5) /* yes => return */
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movb 2(%rax), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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jz L(6) /* yes => return */
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movb 3(%rax), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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jne L(3) /* no => start loop again */
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incq %rax /* adjust pointer */
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L(6): incq %rax
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L(5): incq %rax
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L(4): addq $256, %rsp /* remove skipset */
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cfi_adjust_cfa_offset(-256)
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#ifdef USE_AS_STRPBRK
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xorl %edx,%edx
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orb %cl, %cl /* was last character NUL? */
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cmovzq %rdx, %rax /* Yes: return NULL */
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#else
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subq %rdx, %rax /* we have to return the number of valid
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characters, so compute distance to first
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non-valid character */
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#endif
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ret
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END (strcspn)
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libc_hidden_builtin_def (strcspn)
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