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/* wcsrchr with SSSE3
Copyright (C) 2011-2021 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
.text
ENTRY (wcsrchr)
movd %rsi, %xmm1
mov %rdi, %rcx
punpckldq %xmm1, %xmm1
pxor %xmm2, %xmm2
punpckldq %xmm1, %xmm1
and $63, %rcx
cmp $48, %rcx
ja L(crosscache)
movdqu (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
add $16, %rdi
test %rax, %rax
jnz L(unaligned_match1)
test %rcx, %rcx
jnz L(return_null)
and $-16, %rdi
xor %r8, %r8
jmp L(loop)
.p2align 4
L(unaligned_match1):
test %rcx, %rcx
jnz L(prolog_find_zero_1)
mov %rax, %r8
mov %rdi, %rsi
and $-16, %rdi
jmp L(loop)
.p2align 4
L(crosscache):
and $15, %rcx
and $-16, %rdi
pxor %xmm3, %xmm3
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm3
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm3, %rdx
pmovmskb %xmm0, %rax
shr %cl, %rdx
shr %cl, %rax
add $16, %rdi
test %rax, %rax
jnz L(unaligned_match)
test %rdx, %rdx
jnz L(return_null)
xor %r8, %r8
jmp L(loop)
.p2align 4
L(unaligned_match):
test %rdx, %rdx
jnz L(prolog_find_zero)
mov %rax, %r8
lea (%rdi, %rcx), %rsi
/* Loop start on aligned string. */
.p2align 4
L(loop):
movdqa (%rdi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm3
pcmpeqd %xmm3, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm3
pmovmskb %xmm2, %rcx
pmovmskb %xmm3, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm4
pcmpeqd %xmm4, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm4
pmovmskb %xmm2, %rcx
pmovmskb %xmm4, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm5
pcmpeqd %xmm5, %xmm2
add $16, %rdi
pcmpeqd %xmm1, %xmm5
pmovmskb %xmm2, %rcx
pmovmskb %xmm5, %rax
or %rax, %rcx
jz L(loop)
.p2align 4
L(matches):
test %rax, %rax
jnz L(match)
L(return_value):
test %r8, %r8
jz L(return_null)
mov %r8, %rax
mov %rsi, %rdi
test $15 << 4, %ah
jnz L(match_fourth_wchar)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(match):
pmovmskb %xmm2, %rcx
test %rcx, %rcx
jnz L(find_zero)
mov %rax, %r8
mov %rdi, %rsi
jmp L(loop)
.p2align 4
L(find_zero):
test $15, %cl
jnz L(find_zero_in_first_wchar)
test %cl, %cl
jnz L(find_zero_in_second_wchar)
test $15, %ch
jnz L(find_zero_in_third_wchar)
and $1 << 13 - 1, %rax
jz L(return_value)
test $15 << 4, %ah
jnz L(match_fourth_wchar)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(find_zero_in_first_wchar):
test $1, %rax
jz L(return_value)
lea -16(%rdi), %rax
ret
.p2align 4
L(find_zero_in_second_wchar):
and $1 << 5 - 1, %rax
jz L(return_value)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(find_zero_in_third_wchar):
and $1 << 9 - 1, %rax
jz L(return_value)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(prolog_find_zero):
add %rcx, %rdi
mov %rdx, %rcx
L(prolog_find_zero_1):
test $15, %cl
jnz L(prolog_find_zero_in_first_wchar)
test %cl, %cl
jnz L(prolog_find_zero_in_second_wchar)
test $15, %ch
jnz L(prolog_find_zero_in_third_wchar)
and $1 << 13 - 1, %rax
jz L(return_null)
test $15 << 4, %ah
jnz L(match_fourth_wchar)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(prolog_find_zero_in_first_wchar):
test $1, %rax
jz L(return_null)
lea -16(%rdi), %rax
ret
.p2align 4
L(prolog_find_zero_in_second_wchar):
and $1 << 5 - 1, %rax
jz L(return_null)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(prolog_find_zero_in_third_wchar):
and $1 << 9 - 1, %rax
jz L(return_null)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%rdi), %rax
ret
.p2align 4
L(match_second_wchar):
lea -12(%rdi), %rax
ret
.p2align 4
L(match_third_wchar):
lea -8(%rdi), %rax
ret
.p2align 4
L(match_fourth_wchar):
lea -4(%rdi), %rax
ret
.p2align 4
L(return_null):
xor %rax, %rax
ret
END (wcsrchr)
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