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/* Optimized strcpy stpcpy implementation using LoongArch LASX instructions.
Copyright (C) 2023-2024 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
# ifndef STRCPY
# define STRCPY __strcpy_lasx
# endif
# ifdef USE_AS_STPCPY
# define dstend a0
# else
# define dstend a4
# endif
LEAF(STRCPY, 6)
ori t8, zero, 0xfe0
andi t0, a1, 0xfff
li.d t7, -1
move a2, a0
bltu t8, t0, L(page_cross_start)
L(start_entry):
xvld xr0, a1, 0
li.d t0, 32
andi t1, a2, 0x1f
xvsetanyeqz.b fcc0, xr0
sub.d t0, t0, t1
bcnez fcc0, L(end)
add.d a1, a1, t0
xvst xr0, a2, 0
andi a3, a1, 0x1f
add.d a2, a2, t0
bnez a3, L(unaligned)
xvld xr0, a1, 0
xvsetanyeqz.b fcc0, xr0
bcnez fcc0, L(al_end)
L(al_loop):
xvst xr0, a2, 0
xvld xr0, a1, 32
addi.d a2, a2, 32
addi.d a1, a1, 32
xvsetanyeqz.b fcc0, xr0
bceqz fcc0, L(al_loop)
L(al_end):
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
cto.w t0, t0
add.d a1, a1, t0
xvld xr0, a1, -31
add.d dstend, a2, t0
xvst xr0, dstend, -31
jr ra
nop
L(page_cross_start):
move a4, a1
bstrins.d a4, zero, 4, 0
xvld xr0, a4, 0
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
sra.w t0, t0, a1
beq t0, t7, L(start_entry)
b L(tail)
L(unaligned):
andi t0, a1, 0xfff
bltu t8, t0, L(un_page_cross)
L(un_start_entry):
xvld xr0, a1, 0
xvsetanyeqz.b fcc0, xr0
bcnez fcc0, L(un_end)
addi.d a1, a1, 32
L(un_loop):
xvst xr0, a2, 0
andi t0, a1, 0xfff
addi.d a2, a2, 32
bltu t8, t0, L(page_cross_loop)
L(un_loop_entry):
xvld xr0, a1, 0
addi.d a1, a1, 32
xvsetanyeqz.b fcc0, xr0
bceqz fcc0, L(un_loop)
addi.d a1, a1, -32
L(un_end):
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
L(un_tail):
cto.w t0, t0
add.d a1, a1, t0
xvld xr0, a1, -31
add.d dstend, a2, t0
xvst xr0, dstend, -31
jr ra
L(un_page_cross):
sub.d a4, a1, a3
xvld xr0, a4, 0
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
sra.w t0, t0, a1
beq t0, t7, L(un_start_entry)
b L(un_tail)
L(page_cross_loop):
sub.d a4, a1, a3
xvld xr0, a4, 0
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
sra.w t0, t0, a1
beq t0, t7, L(un_loop_entry)
b L(un_tail)
L(end):
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
L(tail):
cto.w t0, t0
add.d dstend, a2, t0
add.d a5, a1, t0
L(less_32):
srli.d t1, t0, 4
beqz t1, L(less_16)
vld vr0, a1, 0
vld vr1, a5, -15
vst vr0, a2, 0
vst vr1, dstend, -15
jr ra
L(less_16):
srli.d t1, t0, 3
beqz t1, L(less_8)
ld.d t2, a1, 0
ld.d t3, a5, -7
st.d t2, a2, 0
st.d t3, dstend, -7
jr ra
L(less_8):
li.d t1, 3
bltu t0, t1, L(less_3)
ld.w t2, a1, 0
ld.w t3, a5, -3
st.w t2, a2, 0
st.w t3, dstend, -3
jr ra
L(less_3):
beqz t0, L(zero_byte)
ld.h t2, a1, 0
st.h t2, a2, 0
L(zero_byte):
st.b zero, dstend, 0
jr ra
END(STRCPY)
libc_hidden_builtin_def (STRCPY)
#endif
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