mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-11 07:40:05 +00:00
82 lines
1.9 KiB
ArmAsm
82 lines
1.9 KiB
ArmAsm
/* strrchr (str, ch) -- Return pointer to last 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
.text
|
|
ENTRY (strrchr)
|
|
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
|
|
xorl %eax, %eax
|
|
movl %edx, %esi
|
|
orl %ecx, %esi
|
|
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
|
|
movl %edx, %esi
|
|
orl %ecx, %esi
|
|
jz 2b
|
|
|
|
1: bsfl %ecx, %r9d
|
|
movl $0xffffffff, %r8d
|
|
movl $31, %ecx
|
|
jnz 5f
|
|
|
|
bsrl %edx, %edx
|
|
jz 2b
|
|
leaq -16(%rdi,%rdx), %rax
|
|
jmp 2b
|
|
|
|
5: subl %r9d, %ecx
|
|
shrl %cl, %r8d
|
|
andl %r8d, %edx
|
|
bsrl %edx, %edx
|
|
jz 4f
|
|
leaq -16(%rdi,%rdx), %rax
|
|
4: ret
|
|
END (strrchr)
|
|
|
|
weak_alias (strrchr, rindex)
|
|
libc_hidden_builtin_def (strrchr)
|