diff options
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | NEWS | 4 | ||||
| -rw-r--r-- | sysdeps/x86_64/strchrnul.S | 64 |
3 files changed, 69 insertions, 3 deletions
@@ -1,7 +1,9 @@ 2009-04-07 Ulrich Drepper <drepper@redhat.com> + * sysdeps/x86_64/strchrnul.S: New file. + * crypt/Makefile (LDLIBS-crypt.so): Use this variable instead of - depending libcrypt in -lfreebl3. + depending libcrypt on -lfreebl3. * sysdeps/unix/sysv/linux/kernel-features.h: Power also has preadv/pwritev in 2.6.30. @@ -1,4 +1,4 @@ -GNU C Library NEWS -- history of user-visible changes. 2009-4-6 +GNU C Library NEWS -- history of user-visible changes. 2009-4-7 Copyright (C) 1992-2008, 2009 Free Software Foundation, Inc. See the end for copying conditions. @@ -37,7 +37,7 @@ Version 2.10 * New locales: nan_TW@latin, ks_IN -* Faster strlen, strchr, and memchr on x86-64. +* Faster strlen, strchr, strchrnul, and memchr for x86-64. Implemented by Ulrich Drepper. diff --git a/sysdeps/x86_64/strchrnul.S b/sysdeps/x86_64/strchrnul.S new file mode 100644 index 0000000000..ae3aa073eb --- /dev/null +++ b/sysdeps/x86_64/strchrnul.S @@ -0,0 +1,64 @@ +/* strchrnul (str, ch) -- Return pointer to first occurrence of CH in STR + or terminating NUL byte. + For AMD x86-64. + Copyright (C) 2009 Free Software Foundation, Inc. + 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 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + + + .text +ENTRY (__strchrnul) + movd %esi, %xmm1 + movq %rdi, %rcx + punpcklbw %xmm1, %xmm1 + andq $~15, %rdi + pxor %xmm2, %xmm2 + punpcklbw %xmm1, %xmm1 + orl $0xffffffff, %esi + movdqa (%rdi), %xmm0 + pshufd $0, %xmm1, %xmm1 + subq %rdi, %rcx + movdqa %xmm0, %xmm3 + leaq 16(%rdi), %rdi + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm3 + shl %cl, %esi + pmovmskb %xmm0, %edx + pmovmskb %xmm3, %ecx + andl %esi, %edx + andl %esi, %ecx + orl %edx, %ecx + jnz 1f + +2: movdqa (%rdi), %xmm0 + leaq 16(%rdi), %rdi + movdqa %xmm0, %xmm3 + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm3 + pmovmskb %xmm0, %edx + pmovmskb %xmm3, %ecx + orl %edx, %ecx + jz 2b + +1: bsfl %ecx, %edx + leaq -16(%rdi,%rdx), %rax + ret +END (__strchrnul) + +weak_alias (__strchrnul, strchrnul) |