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Diffstat (limited to 'sysdeps/x86_64/strspn.S')
| -rw-r--r-- | sysdeps/x86_64/strspn.S | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/sysdeps/x86_64/strspn.S b/sysdeps/x86_64/strspn.S deleted file mode 100644 index 3da576f3d6..0000000000 --- a/sysdeps/x86_64/strspn.S +++ /dev/null @@ -1,115 +0,0 @@ -/* strspn (str, ss) -- Return the length of the initial segment of STR - which contains only characters from SS. - For AMD x86-64. - 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>. - Adopted for x86-64 by Andreas Jaeger <aj@suse.de>. - - 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> - - .text -ENTRY (strspn) - - movq %rdi, %rdx /* Save SRC. */ - - /* 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. */ - movq %rdi, %r8 /* Save value. */ - subq $256, %rsp /* Make space for 256 bytes. */ - cfi_adjust_cfa_offset(256) - movl $32, %ecx /* 32*8 bytes = 256 bytes. */ - movq %rsp, %rdi - xorl %eax, %eax /* We store 0s. */ - cld - rep - stosq - - movq %rsi, %rax /* Setup stopset. */ - -/* For understanding the following code remember that %rcx == 0 now. - Although all the following instruction only modify %cl we always - have a correct zero-extended 64-bit value in %rcx. */ - - .p2align 4 -L(2): movb (%rax), %cl /* get byte from stopset */ - testb %cl, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 1(%rax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 2(%rax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 3(%rax), %cl /* get byte from stopset */ - addq $4, %rax /* increment stopset pointer */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - testb $0xff, %cl /* is NUL char? */ - jnz L(2) /* no => process next dword from stopset */ - -L(1): leaq -4(%rdx), %rax /* 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. */ - - .p2align 4 -L(3): addq $4, %rax /* adjust pointer for full loop round */ - - movb (%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - jz L(4) /* no => return */ - - movb 1(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - jz L(5) /* no => return */ - - movb 2(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - jz L(6) /* no => return */ - - movb 3(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - jnz L(3) /* yes => start loop again */ - - incq %rax /* adjust pointer */ -L(6): incq %rax -L(5): incq %rax - -L(4): addq $256, %rsp /* remove stopset */ - cfi_adjust_cfa_offset(-256) - subq %rdx, %rax /* 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) |