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/* Optimized strlen 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
#ifndef AS_STRCHRNUL
# define STRCHR __strchr_lsx
#endif
LEAF(STRCHR, 6)
andi t1, a0, 0xf
bstrins.d a0, zero, 3, 0
vld vr0, a0, 0
li.d t2, -1
vreplgr2vr.b vr1, a1
sll.d t3, t2, t1
vxor.v vr2, vr0, vr1
vmin.bu vr0, vr0, vr2
vmsknz.b vr0, vr0
movfr2gr.s t0, fa0
ext.w.h t0, t0
orn t0, t0, t3
beq t0, t2, L(loop)
L(found):
cto.w t0, t0
add.d a0, a0, t0
#ifndef AS_STRCHRNUL
vreplve.b vr2, vr2, t0
vpickve2gr.bu t1, vr2, 0
masknez a0, a0, t1
#endif
jr ra
L(loop):
vld vr0, a0, 16
addi.d a0, a0, 16
vxor.v vr2, vr0, vr1
vmin.bu vr0, vr0, vr2
vsetanyeqz.b fcc0, vr0
bceqz fcc0, L(loop)
vmsknz.b vr0, vr0
movfr2gr.s t0, fa0
b L(found)
END(STRCHR)
libc_hidden_builtin_def (STRCHR)
#endif
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