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/* Optimized memrchr 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 MEMRCHR __memrchr_lsx
LEAF(MEMRCHR, 6)
beqz a2, L(ret0)
addi.d a2, a2, -1
add.d a3, a0, a2
andi t1, a3, 0x1f
bstrins.d a3, zero, 4, 0
addi.d t1, t1, 1
vld vr0, a3, 0
vld vr1, a3, 16
sub.d t2, zero, t1
li.d t3, -1
vreplgr2vr.b vr2, a1
andi t4, a0, 0x1f
srl.d t2, t3, t2
vseq.b vr0, vr0, vr2
vseq.b vr1, vr1, vr2
vmsknz.b vr0, vr0
vmsknz.b vr1, vr1
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
and t0, t0, t2
bltu a2, t1, L(end)
bnez t0, L(found)
bstrins.d a0, zero, 4, 0
L(loop):
vld vr0, a3, -32
vld vr1, a3, -16
addi.d a3, a3, -32
vseq.b vr0, vr0, vr2
vseq.b vr1, vr1, vr2
beq a0, a3, L(out)
vmax.bu vr3, vr0, vr1
vseteqz.v fcc0, vr3
bcnez fcc0, L(loop)
vmsknz.b vr0, vr0
vmsknz.b vr1, vr1
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
L(found):
addi.d a0, a3, 31
clz.w t1, t0
sub.d a0, a0, t1
jr ra
L(out):
vmsknz.b vr0, vr0
vmsknz.b vr1, vr1
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
L(end):
sll.d t2, t3, t4
and t0, t0, t2
addi.d a0, a3, 31
clz.w t1, t0
sub.d a0, a0, t1
maskeqz a0, a0, t0
jr ra
L(ret0):
move a0, zero
jr ra
END(MEMRCHR)
libc_hidden_builtin_def (MEMRCHR)
#endif
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