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* sysdeps/x86_64/rawmemchr.S: New file.

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Ulrich Drepper 2009-04-10 07:57:20 +00:00
parent 1d498daa95
commit f140a0d53d
3 changed files with 57 additions and 2 deletions
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2
ChangeLog
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2009-04-09 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/rawmemchr.S: New file.
* stdio-common/vfprintf.c (vfprintf): Slightly more compact code.
Simplified code and possible copy problem fixed.

3
sysdeps/x86_64/memchr.S
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/* strlen(str) -- determine the length of the string STR.
Copyright (C) 2009 Free Software Foundation, Inc.
/* Copyright (C) 2009 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
This file is part of the GNU C Library.

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sysdeps/x86_64/rawmemchr.S Normal file
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/* Copyright (C) 2009 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
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 (rawmemchr)
movd %esi, %xmm1
movq %rdi, %rcx
punpcklbw %xmm1, %xmm1
andq $~15, %rdi
punpcklbw %xmm1, %xmm1
orl $0xffffffff, %esi
movdqa (%rdi), %xmm0
pshufd $0, %xmm1, %xmm1
subq %rdi, %rcx
pcmpeqb %xmm1, %xmm0
shl %cl, %esi
pmovmskb %xmm0, %ecx
leaq 16(%rdi), %rdi
andl %esi, %ecx
jnz 1f
2: movdqa (%rdi), %xmm0
leaq 16(%rdi), %rdi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %ecx
testl %ecx, %ecx
jz 2b
1: bsfl %ecx, %ecx
leaq -16(%rcx,%rdi), %rax
ret
END (rawmemchr)
strong_alias (rawmemchr, __rawmemchr)
libc_hidden_builtin_def (__rawmemchr)