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/* Optimized wcslen for x86-64 with SSE2.
Copyright (C) 2011-2013 Free Software Foundation, Inc.
Contributed by Intel Corporation.
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 (__wcslen)
cmpl $0, (%rdi)
jz L(exit_tail0)
cmpl $0, 4(%rdi)
jz L(exit_tail1)
cmpl $0, 8(%rdi)
jz L(exit_tail2)
cmpl $0, 12(%rdi)
jz L(exit_tail3)
cmpl $0, 16(%rdi)
jz L(exit_tail4)
cmpl $0, 20(%rdi)
jz L(exit_tail5)
cmpl $0, 24(%rdi)
jz L(exit_tail6)
cmpl $0, 28(%rdi)
jz L(exit_tail7)
pxor %xmm0, %xmm0
lea 32(%rdi), %rax
lea 16(%rdi), %rcx
and $-16, %rax
pcmpeqd (%rax), %xmm0
pmovmskb %xmm0, %edx
pxor %xmm1, %xmm1
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm1
pmovmskb %xmm1, %edx
pxor %xmm2, %xmm2
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm2
pmovmskb %xmm2, %edx
pxor %xmm3, %xmm3
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqd (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
and $-0x40, %rax
.p2align 4
L(aligned_64_loop):
movaps (%rax), %xmm0
movaps 16(%rax), %xmm1
movaps 32(%rax), %xmm2
movaps 48(%rax), %xmm6
pminub %xmm1, %xmm0
pminub %xmm6, %xmm2
pminub %xmm0, %xmm2
pcmpeqd %xmm3, %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 64(%rax), %rax
jz L(aligned_64_loop)
pcmpeqd -64(%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 48(%rcx), %rcx
jnz L(exit)
pcmpeqd %xmm1, %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea -16(%rcx), %rcx
jnz L(exit)
pcmpeqd -32(%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea -16(%rcx), %rcx
jnz L(exit)
pcmpeqd %xmm6, %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea -16(%rcx), %rcx
jnz L(exit)
jmp L(aligned_64_loop)
.p2align 4
L(exit):
sub %rcx, %rax
shr $2, %rax
test %dl, %dl
jz L(exit_high)
mov %dl, %cl
and $15, %cl
jz L(exit_1)
ret
.p2align 4
L(exit_high):
mov %dh, %ch
and $15, %ch
jz L(exit_3)
add $2, %rax
ret
.p2align 4
L(exit_1):
add $1, %rax
ret
.p2align 4
L(exit_3):
add $3, %rax
ret
.p2align 4
L(exit_tail0):
xor %rax, %rax
ret
.p2align 4
L(exit_tail1):
mov $1, %rax
ret
.p2align 4
L(exit_tail2):
mov $2, %rax
ret
.p2align 4
L(exit_tail3):
mov $3, %rax
ret
.p2align 4
L(exit_tail4):
mov $4, %rax
ret
.p2align 4
L(exit_tail5):
mov $5, %rax
ret
.p2align 4
L(exit_tail6):
mov $6, %rax
ret
.p2align 4
L(exit_tail7):
mov $7, %rax
ret
END (__wcslen)
weak_alias(__wcslen, wcslen)
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