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/* Optimized strnlen 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
# define STRNLEN __strnlen_lasx
LEAF(STRNLEN, 6)
beqz a1, L(ret0)
andi t1, a0, 0x3f
li.d t3, 65
sub.d a2, a0, t1
xvld xr0, a2, 0
xvld xr1, a2, 32
sub.d t1, t3, t1
move a3, a0
sltu t1, a1, t1
xvmsknz.b xr0, xr0
xvmsknz.b xr1, xr1
xvpickve.w xr2, xr0, 4
xvpickve.w xr3, xr1, 4
vilvl.h vr0, vr2, vr0
vilvl.h vr1, vr3, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
sra.d t0, t0, a0
orn t1, t1, t0
bnez t1, L(end)
add.d a4, a0, a1
move a0, a2
addi.d a4, a4, -1
bstrins.d a4, zero, 5, 0
L(loop):
xvld xr0, a0, 64
xvld xr1, a0, 96
addi.d a0, a0, 64
beq a0, a4, L(out)
xvmin.bu xr2, xr0, xr1
xvsetanyeqz.b fcc0, xr2
bceqz fcc0, L(loop)
L(out):
xvmsknz.b xr0, xr0
xvmsknz.b xr1, xr1
xvpickve.w xr2, xr0, 4
xvpickve.w xr3, xr1, 4
vilvl.h vr0, vr2, vr0
vilvl.h vr1, vr3, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
L(end):
sub.d a0, a0, a3
cto.d t0, t0
add.d a0, a0, t0
sltu t1, a0, a1
masknez t0, a1, t1
maskeqz t1, a0, t1
or a0, t0, t1
jr ra
L(ret0):
move a0, zero
jr ra
END(STRNLEN)
libc_hidden_def (STRNLEN)
#endif
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