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/* Optimized memchr implementation using LoongArch LASX 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 MEMCHR __memchr_lasx
LEAF(MEMCHR, 6)
beqz a2, L(ret0)
add.d a3, a0, a2
andi t0, a0, 0x3f
bstrins.d a0, zero, 5, 0
xvld xr0, a0, 0
xvld xr1, a0, 32
li.d t1, -1
li.d t2, 64
xvreplgr2vr.b xr2, a1
sll.d t3, t1, t0
sub.d t2, t2, t0
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
and t0, t0, t3
bgeu t2, a2, L(end)
bnez t0, L(found)
addi.d a4, a3, -1
bstrins.d a4, zero, 5, 0
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
beq a0, a4, L(out)
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
L(found):
ctz.d t1, t0
add.d a0, a0, t1
jr ra
L(ret0):
move a0, zero
jr ra
L(out):
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
L(end):
sub.d t2, zero, a3
srl.d t1, t1, t2
and t0, t0, t1
ctz.d t1, t0
add.d a0, a0, t1
maskeqz a0, a0, t0
jr ra
END(MEMCHR)
libc_hidden_builtin_def (MEMCHR)
#endif
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