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/* memset with AVX2
Copyright (C) 2014-2016 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>
#if IS_IN (libc)
#include "asm-syntax.h"
#ifndef MEMSET
# define MEMSET __memset_avx2
# define MEMSET_CHK __memset_chk_avx2
#endif
.section .text.avx2,"ax",@progbits
#if defined PIC
ENTRY (MEMSET_CHK)
cmpq %rdx, %rcx
jb HIDDEN_JUMPTARGET (__chk_fail)
END (MEMSET_CHK)
#endif
ENTRY (MEMSET)
vpxor %xmm0, %xmm0, %xmm0
vmovd %esi, %xmm1
lea (%rdi, %rdx), %rsi
mov %rdi, %rax
vpshufb %xmm0, %xmm1, %xmm0
cmp $16, %rdx
jb L(less_16bytes)
cmp $256, %rdx
jae L(256bytesormore)
cmp $128, %dl
jb L(less_128bytes)
vmovdqu %xmm0, (%rdi)
vmovdqu %xmm0, 0x10(%rdi)
vmovdqu %xmm0, 0x20(%rdi)
vmovdqu %xmm0, 0x30(%rdi)
vmovdqu %xmm0, 0x40(%rdi)
vmovdqu %xmm0, 0x50(%rdi)
vmovdqu %xmm0, 0x60(%rdi)
vmovdqu %xmm0, 0x70(%rdi)
vmovdqu %xmm0, -0x80(%rsi)
vmovdqu %xmm0, -0x70(%rsi)
vmovdqu %xmm0, -0x60(%rsi)
vmovdqu %xmm0, -0x50(%rsi)
vmovdqu %xmm0, -0x40(%rsi)
vmovdqu %xmm0, -0x30(%rsi)
vmovdqu %xmm0, -0x20(%rsi)
vmovdqu %xmm0, -0x10(%rsi)
ret
.p2align 4
L(less_128bytes):
cmp $64, %dl
jb L(less_64bytes)
vmovdqu %xmm0, (%rdi)
vmovdqu %xmm0, 0x10(%rdi)
vmovdqu %xmm0, 0x20(%rdi)
vmovdqu %xmm0, 0x30(%rdi)
vmovdqu %xmm0, -0x40(%rsi)
vmovdqu %xmm0, -0x30(%rsi)
vmovdqu %xmm0, -0x20(%rsi)
vmovdqu %xmm0, -0x10(%rsi)
ret
.p2align 4
L(less_64bytes):
cmp $32, %dl
jb L(less_32bytes)
vmovdqu %xmm0, (%rdi)
vmovdqu %xmm0, 0x10(%rdi)
vmovdqu %xmm0, -0x20(%rsi)
vmovdqu %xmm0, -0x10(%rsi)
ret
.p2align 4
L(less_32bytes):
vmovdqu %xmm0, (%rdi)
vmovdqu %xmm0, -0x10(%rsi)
ret
.p2align 4
L(less_16bytes):
cmp $8, %dl
jb L(less_8bytes)
vmovq %xmm0, (%rdi)
vmovq %xmm0, -0x08(%rsi)
ret
.p2align 4
L(less_8bytes):
vmovd %xmm0, %ecx
cmp $4, %dl
jb L(less_4bytes)
mov %ecx, (%rdi)
mov %ecx, -0x04(%rsi)
ret
.p2align 4
L(less_4bytes):
cmp $2, %dl
jb L(less_2bytes)
mov %cx, (%rdi)
mov %cx, -0x02(%rsi)
ret
.p2align 4
L(less_2bytes):
cmp $1, %dl
jb L(less_1bytes)
mov %cl, (%rdi)
L(less_1bytes):
ret
.p2align 4
L(256bytesormore):
vinserti128 $1, %xmm0, %ymm0, %ymm0
and $-0x20, %rdi
add $0x20, %rdi
vmovdqu %ymm0, (%rax)
sub %rdi, %rax
lea -0x80(%rax, %rdx), %rcx
cmp $4096, %rcx
ja L(gobble_data)
L(gobble_128_loop):
vmovdqa %ymm0, (%rdi)
vmovdqa %ymm0, 0x20(%rdi)
vmovdqa %ymm0, 0x40(%rdi)
vmovdqa %ymm0, 0x60(%rdi)
sub $-0x80, %rdi
add $-0x80, %ecx
jb L(gobble_128_loop)
mov %rsi, %rax
vmovdqu %ymm0, -0x80(%rsi)
vmovdqu %ymm0, -0x60(%rsi)
vmovdqu %ymm0, -0x40(%rsi)
vmovdqu %ymm0, -0x20(%rsi)
sub %rdx, %rax
vzeroupper
ret
.p2align 4
L(gobble_data):
sub $-0x80, %rcx
vmovd %xmm0, %eax
rep stosb
mov %rsi, %rax
sub %rdx, %rax
vzeroupper
ret
END (MEMSET)
#endif
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