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/* memset optimized with AVX512 for KNL hardware.
Copyright (C) 2015-2022 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>
#if IS_IN (libc)
#include "asm-syntax.h"
#ifndef MEMSET
# define MEMSET __memset_avx512_no_vzeroupper
# define MEMSET_CHK __memset_chk_avx512_no_vzeroupper
#endif
.section .text.avx512,"ax",@progbits
#if defined PIC
ENTRY (MEMSET_CHK)
cmp %RDX_LP, %RCX_LP
jb HIDDEN_JUMPTARGET (__chk_fail)
END (MEMSET_CHK)
#endif
ENTRY (MEMSET)
# ifdef __ILP32__
/* Clear the upper 32 bits. */
mov %edx, %edx
# endif
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 $512, %rdx
vbroadcastss %xmm0, %zmm2
ja L(512bytesormore)
cmp $256, %rdx
jb L(less_256bytes)
vmovups %zmm2, (%rdi)
vmovups %zmm2, 0x40(%rdi)
vmovups %zmm2, 0x80(%rdi)
vmovups %zmm2, 0xC0(%rdi)
vmovups %zmm2, -0x100(%rsi)
vmovups %zmm2, -0xC0(%rsi)
vmovups %zmm2, -0x80(%rsi)
vmovups %zmm2, -0x40(%rsi)
ret
L(less_256bytes):
cmp $128, %dl
jb L(less_128bytes)
vmovups %zmm2, (%rdi)
vmovups %zmm2, 0x40(%rdi)
vmovups %zmm2, -0x80(%rsi)
vmovups %zmm2, -0x40(%rsi)
ret
L(less_128bytes):
cmp $64, %dl
jb L(less_64bytes)
vmovups %zmm2, (%rdi)
vmovups %zmm2, -0x40(%rsi)
ret
L(less_64bytes):
cmp $32, %dl
jb L(less_32bytes)
vmovdqu %ymm2, (%rdi)
vmovdqu %ymm2, -0x20(%rsi)
ret
L(less_32bytes):
vmovdqu %xmm0, (%rdi)
vmovdqu %xmm0, -0x10(%rsi)
ret
L(less_16bytes):
cmp $8, %dl
jb L(less_8bytes)
vmovq %xmm0, (%rdi)
vmovq %xmm0, -0x08(%rsi)
ret
L(less_8bytes):
vmovd %xmm0, %ecx
cmp $4, %dl
jb L(less_4bytes)
mov %ecx, (%rdi)
mov %ecx, -0x04(%rsi)
ret
L(less_4bytes):
cmp $2, %dl
jb L(less_2bytes)
mov %cx, (%rdi)
mov %cx, -0x02(%rsi)
ret
L(less_2bytes):
cmp $1, %dl
jb L(less_1bytes)
mov %cl, (%rdi)
L(less_1bytes):
ret
L(512bytesormore):
mov __x86_shared_cache_size_half(%rip), %rcx
cmp %rcx, %rdx
ja L(preloop_large)
cmp $1024, %rdx
ja L(1024bytesormore)
vmovups %zmm2, (%rdi)
vmovups %zmm2, 0x40(%rdi)
vmovups %zmm2, 0x80(%rdi)
vmovups %zmm2, 0xC0(%rdi)
vmovups %zmm2, 0x100(%rdi)
vmovups %zmm2, 0x140(%rdi)
vmovups %zmm2, 0x180(%rdi)
vmovups %zmm2, 0x1C0(%rdi)
vmovups %zmm2, -0x200(%rsi)
vmovups %zmm2, -0x1C0(%rsi)
vmovups %zmm2, -0x180(%rsi)
vmovups %zmm2, -0x140(%rsi)
vmovups %zmm2, -0x100(%rsi)
vmovups %zmm2, -0xC0(%rsi)
vmovups %zmm2, -0x80(%rsi)
vmovups %zmm2, -0x40(%rsi)
ret
/* Align on 64 and loop with aligned stores. */
L(1024bytesormore):
sub $0x100, %rsi
vmovups %zmm2, (%rax)
and $-0x40, %rdi
add $0x40, %rdi
L(gobble_256bytes_loop):
vmovaps %zmm2, (%rdi)
vmovaps %zmm2, 0x40(%rdi)
vmovaps %zmm2, 0x80(%rdi)
vmovaps %zmm2, 0xC0(%rdi)
add $0x100, %rdi
cmp %rsi, %rdi
jb L(gobble_256bytes_loop)
vmovups %zmm2, (%rsi)
vmovups %zmm2, 0x40(%rsi)
vmovups %zmm2, 0x80(%rsi)
vmovups %zmm2, 0xC0(%rsi)
ret
/* Align on 128 and loop with non-temporal stores. */
L(preloop_large):
and $-0x80, %rdi
add $0x80, %rdi
vmovups %zmm2, (%rax)
vmovups %zmm2, 0x40(%rax)
sub $0x200, %rsi
L(gobble_512bytes_nt_loop):
vmovntdq %zmm2, (%rdi)
vmovntdq %zmm2, 0x40(%rdi)
vmovntdq %zmm2, 0x80(%rdi)
vmovntdq %zmm2, 0xC0(%rdi)
vmovntdq %zmm2, 0x100(%rdi)
vmovntdq %zmm2, 0x140(%rdi)
vmovntdq %zmm2, 0x180(%rdi)
vmovntdq %zmm2, 0x1C0(%rdi)
add $0x200, %rdi
cmp %rsi, %rdi
jb L(gobble_512bytes_nt_loop)
sfence
vmovups %zmm2, (%rsi)
vmovups %zmm2, 0x40(%rsi)
vmovups %zmm2, 0x80(%rsi)
vmovups %zmm2, 0xC0(%rsi)
vmovups %zmm2, 0x100(%rsi)
vmovups %zmm2, 0x140(%rsi)
vmovups %zmm2, 0x180(%rsi)
vmovups %zmm2, 0x1C0(%rsi)
ret
END (MEMSET)
#endif
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