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/* strcat with AVX2
Copyright (C) 2011-2021 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
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
# include <sysdep.h>
# ifndef STRCAT
# define STRCAT __strcat_avx2
# endif
# define USE_AS_STRCAT
/* Number of bytes in a vector register */
# define VEC_SIZE 32
.section .text.avx,"ax",@progbits
ENTRY (STRCAT)
mov %rdi, %r9
# ifdef USE_AS_STRNCAT
mov %rdx, %r8
# endif
xor %eax, %eax
mov %edi, %ecx
and $((VEC_SIZE * 4) - 1), %ecx
vpxor %xmm6, %xmm6, %xmm6
cmp $(VEC_SIZE * 3), %ecx
ja L(fourth_vector_boundary)
vpcmpeqb (%rdi), %ymm6, %ymm0
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_first_vector)
mov %rdi, %rax
and $-VEC_SIZE, %rax
jmp L(align_vec_size_start)
L(fourth_vector_boundary):
mov %rdi, %rax
and $-VEC_SIZE, %rax
vpcmpeqb (%rax), %ymm6, %ymm0
mov $-1, %r10d
sub %rax, %rcx
shl %cl, %r10d
vpmovmskb %ymm0, %edx
and %r10d, %edx
jnz L(exit)
L(align_vec_size_start):
vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm0
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_second_vector)
vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit_null_on_third_vector)
vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit_null_on_fourth_vector)
vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
vpmovmskb %ymm3, %edx
test %edx, %edx
jnz L(exit_null_on_fifth_vector)
vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
add $(VEC_SIZE * 4), %rax
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_second_vector)
vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit_null_on_third_vector)
vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit_null_on_fourth_vector)
vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
vpmovmskb %ymm3, %edx
test %edx, %edx
jnz L(exit_null_on_fifth_vector)
vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
add $(VEC_SIZE * 4), %rax
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_second_vector)
vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit_null_on_third_vector)
vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit_null_on_fourth_vector)
vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
vpmovmskb %ymm3, %edx
test %edx, %edx
jnz L(exit_null_on_fifth_vector)
vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
add $(VEC_SIZE * 4), %rax
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_second_vector)
vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit_null_on_third_vector)
vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit_null_on_fourth_vector)
vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
vpmovmskb %ymm3, %edx
test %edx, %edx
jnz L(exit_null_on_fifth_vector)
test $((VEC_SIZE * 4) - 1), %rax
jz L(align_four_vec_loop)
vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
add $(VEC_SIZE * 5), %rax
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit)
test $((VEC_SIZE * 4) - 1), %rax
jz L(align_four_vec_loop)
vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm1
add $VEC_SIZE, %rax
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit)
test $((VEC_SIZE * 4) - 1), %rax
jz L(align_four_vec_loop)
vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm2
add $VEC_SIZE, %rax
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit)
test $((VEC_SIZE * 4) - 1), %rax
jz L(align_four_vec_loop)
vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm3
add $VEC_SIZE, %rax
vpmovmskb %ymm3, %edx
test %edx, %edx
jnz L(exit)
add $VEC_SIZE, %rax
.p2align 4
L(align_four_vec_loop):
vmovaps (%rax), %ymm4
vpminub VEC_SIZE(%rax), %ymm4, %ymm4
vmovaps (VEC_SIZE * 2)(%rax), %ymm5
vpminub (VEC_SIZE * 3)(%rax), %ymm5, %ymm5
add $(VEC_SIZE * 4), %rax
vpminub %ymm4, %ymm5, %ymm5
vpcmpeqb %ymm5, %ymm6, %ymm5
vpmovmskb %ymm5, %edx
test %edx, %edx
jz L(align_four_vec_loop)
vpcmpeqb -(VEC_SIZE * 4)(%rax), %ymm6, %ymm0
sub $(VEC_SIZE * 5), %rax
vpmovmskb %ymm0, %edx
test %edx, %edx
jnz L(exit_null_on_second_vector)
vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
vpmovmskb %ymm1, %edx
test %edx, %edx
jnz L(exit_null_on_third_vector)
vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
vpmovmskb %ymm2, %edx
test %edx, %edx
jnz L(exit_null_on_fourth_vector)
vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
vpmovmskb %ymm3, %edx
sub %rdi, %rax
bsf %rdx, %rdx
add %rdx, %rax
add $(VEC_SIZE * 4), %rax
jmp L(StartStrcpyPart)
.p2align 4
L(exit):
sub %rdi, %rax
L(exit_null_on_first_vector):
bsf %rdx, %rdx
add %rdx, %rax
jmp L(StartStrcpyPart)
.p2align 4
L(exit_null_on_second_vector):
sub %rdi, %rax
bsf %rdx, %rdx
add %rdx, %rax
add $VEC_SIZE, %rax
jmp L(StartStrcpyPart)
.p2align 4
L(exit_null_on_third_vector):
sub %rdi, %rax
bsf %rdx, %rdx
add %rdx, %rax
add $(VEC_SIZE * 2), %rax
jmp L(StartStrcpyPart)
.p2align 4
L(exit_null_on_fourth_vector):
sub %rdi, %rax
bsf %rdx, %rdx
add %rdx, %rax
add $(VEC_SIZE * 3), %rax
jmp L(StartStrcpyPart)
.p2align 4
L(exit_null_on_fifth_vector):
sub %rdi, %rax
bsf %rdx, %rdx
add %rdx, %rax
add $(VEC_SIZE * 4), %rax
.p2align 4
L(StartStrcpyPart):
lea (%r9, %rax), %rdi
mov %rsi, %rcx
mov %r9, %rax /* save result */
# ifdef USE_AS_STRNCAT
test %r8, %r8
jz L(ExitZero)
# define USE_AS_STRNCPY
# endif
# include "strcpy-avx2.S"
#endif
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