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/* Optimized memset implementation using LoongArch LASX instructions.
Copyright (C) 2023 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>
#include <sys/regdef.h>
#include <sys/asm.h>
#if IS_IN (libc) && !defined __loongarch_soft_float
# define MEMSET __memset_lasx
LEAF(MEMSET, 6)
li.d t1, 32
move a3, a0
xvreplgr2vr.b xr0, a1
add.d a4, a0, a2
bgeu t1, a2, L(less_32bytes)
li.d t3, 128
li.d t2, 64
blt t3, a2, L(long_bytes)
L(less_128bytes):
bgeu t2, a2, L(less_64bytes)
xvst xr0, a3, 0
xvst xr0, a3, 32
xvst xr0, a4, -32
xvst xr0, a4, -64
jr ra
L(less_64bytes):
xvst xr0, a3, 0
xvst xr0, a4, -32
jr ra
L(less_32bytes):
srli.d t0, a2, 4
beqz t0, L(less_16bytes)
vst vr0, a3, 0
vst vr0, a4, -16
jr ra
L(less_16bytes):
srli.d t0, a2, 3
beqz t0, L(less_8bytes)
vstelm.d vr0, a3, 0, 0
vstelm.d vr0, a4, -8, 0
jr ra
L(less_8bytes):
srli.d t0, a2, 2
beqz t0, L(less_4bytes)
vstelm.w vr0, a3, 0, 0
vstelm.w vr0, a4, -4, 0
jr ra
L(less_4bytes):
srli.d t0, a2, 1
beqz t0, L(less_2bytes)
vstelm.h vr0, a3, 0, 0
vstelm.h vr0, a4, -2, 0
jr ra
L(less_2bytes):
beqz a2, L(less_1bytes)
st.b a1, a3, 0
L(less_1bytes):
jr ra
L(long_bytes):
xvst xr0, a3, 0
bstrins.d a3, zero, 4, 0
addi.d a3, a3, 32
sub.d a2, a4, a3
andi t0, a2, 0xff
beq t0, a2, L(long_end)
move a2, t0
sub.d t0, a4, t0
L(loop_256):
xvst xr0, a3, 0
xvst xr0, a3, 32
xvst xr0, a3, 64
xvst xr0, a3, 96
xvst xr0, a3, 128
xvst xr0, a3, 160
xvst xr0, a3, 192
xvst xr0, a3, 224
addi.d a3, a3, 256
bne a3, t0, L(loop_256)
L(long_end):
bltu a2, t3, L(end_less_128)
addi.d a2, a2, -128
xvst xr0, a3, 0
xvst xr0, a3, 32
xvst xr0, a3, 64
xvst xr0, a3, 96
addi.d a3, a3, 128
L(end_less_128):
bltu a2, t2, L(end_less_64)
addi.d a2, a2, -64
xvst xr0, a3, 0
xvst xr0, a3, 32
addi.d a3, a3, 64
L(end_less_64):
bltu a2, t1, L(end_less_32)
xvst xr0, a3, 0
L(end_less_32):
xvst xr0, a4, -32
jr ra
END(MEMSET)
libc_hidden_builtin_def (MEMSET)
#endif
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