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/* Optimized rawmemchr 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/asm.h>
#include <sys/regdef.h>
#if IS_IN (libc) && !defined __loongarch_soft_float
# define RAWMEMCHR __rawmemchr_lasx
LEAF(RAWMEMCHR, 6)
move a2, a0
bstrins.d a0, zero, 5, 0
xvld xr0, a0, 0
xvld xr1, a0, 32
xvreplgr2vr.b xr2, a1
xvseq.b xr0, xr0, xr2
xvseq.b xr1, xr1, xr2
xvmsknz.b xr0, xr0
xvmsknz.b xr1, xr1
xvpickve.w xr3, xr0, 4
xvpickve.w xr4, xr1, 4
vilvl.h vr0, vr3, vr0
vilvl.h vr1, vr4, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
sra.d t0, t0, a2
beqz t0, L(loop)
ctz.d t0, t0
add.d a0, a2, t0
jr ra
L(loop):
xvld xr0, a0, 64
xvld xr1, a0, 96
addi.d a0, a0, 64
xvseq.b xr0, xr0, xr2
xvseq.b xr1, xr1, xr2
xvmax.bu xr3, xr0, xr1
xvseteqz.v fcc0, xr3
bcnez fcc0, L(loop)
xvmsknz.b xr0, xr0
xvmsknz.b xr1, xr1
xvpickve.w xr3, xr0, 4
xvpickve.w xr4, xr1, 4
vilvl.h vr0, vr3, vr0
vilvl.h vr1, vr4, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
ctz.d t0, t0
add.d a0, a0, t0
jr ra
END(RAWMEMCHR)
libc_hidden_builtin_def (RAWMEMCHR)
#endif
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