mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
70 lines
1.7 KiB
ArmAsm
70 lines
1.7 KiB
ArmAsm
/* strchr (str, ch) -- Return pointer to first occurrence of CH in STR.
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
.text
|
|
ENTRY (strchr)
|
|
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 %edx, %edx
|
|
jz 4f
|
|
bsfl %ecx, %ecx
|
|
leaq -16(%rdi,%rdx), %rax
|
|
cmpl %edx, %ecx
|
|
je 5f
|
|
4: xorl %eax, %eax
|
|
5: ret
|
|
END (strchr)
|
|
|
|
weak_alias (strchr, index)
|
|
libc_hidden_builtin_def (strchr)
|
|
|