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/* Optimized strnlen implementation using loongarch LSX 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 STRNLEN __strnlen_lsx
LEAF(STRNLEN, 6)
beqz a1, L(ret0)
andi t1, a0, 0x1f
li.d t3, 33
sub.d a2, a0, t1
vld vr0, a2, 0
vld vr1, a2, 16
sub.d t1, t3, t1
move a3, a0
sltu t1, a1, t1
vmsknz.b vr0, vr0
vmsknz.b vr1, vr1
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
sra.w 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, 4, 0
L(loop):
vld vr0, a0, 32
vld vr1, a0, 48
addi.d a0, a0, 32
beq a0, a4, L(out)
vmin.bu vr2, vr0, vr1
vsetanyeqz.b fcc0, vr2
bceqz fcc0, L(loop)
L(out):
vmsknz.b vr0, vr0
vmsknz.b vr1, vr1
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
L(end):
sub.d a0, a0, a3
cto.w 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_builtin_def (STRNLEN)
#endif
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