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/* Optimized strncmp 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 STRNCMP __strncmp_lsx
LEAF(STRNCMP, 6)
beqz a2, L(ret0)
pcalau12i t0, %pc_hi20(L(INDEX))
andi a3, a0, 0xf
vld vr2, t0, %pc_lo12(L(INDEX))
andi a4, a1, 0xf
li.d t2, 16
bne a3, a4, L(unaligned)
xor t0, a0, a3
xor t1, a1, a4
vld vr0, t0, 0
vld vr1, t1, 0
vreplgr2vr.b vr3, a3
sub.d t2, t2, a3
vadd.b vr3, vr3, vr2
vshuf.b vr0, vr3, vr0, vr3
vshuf.b vr1, vr3, vr1, vr3
vseq.b vr3, vr0, vr1
vmin.bu vr3, vr0, vr3
bgeu t2, a2, L(al_early_end)
vsetanyeqz.b fcc0, vr3
bcnez fcc0, L(al_end)
add.d a3, a0, a2
addi.d a4, a3, -1
bstrins.d a4, zero, 3, 0
sub.d a2, a3, a4
L(al_loop):
vld vr0, t0, 16
vld vr1, t1, 16
addi.d t0, t0, 16
addi.d t1, t1, 16
vseq.b vr3, vr0, vr1
vmin.bu vr3, vr0, vr3
beq t0, a4, L(al_early_end)
vsetanyeqz.b fcc0, vr3
bceqz fcc0, L(al_loop)
L(al_end):
vseqi.b vr3, vr3, 0
vfrstpi.b vr3, vr3, 0
vshuf.b vr0, vr0, vr0, vr3
vshuf.b vr1, vr1, vr1, vr3
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d a0, t0, t1
jr ra
L(al_early_end):
vreplgr2vr.b vr4, a2
vslt.b vr4, vr2, vr4
vorn.v vr3, vr3, vr4
b L(al_end)
L(unaligned):
slt a5, a3, a4
xor t0, a0, a1
maskeqz t0, t0, a5
xor a0, a0, t0
xor a1, a1, t0
andi a3, a0, 0xf
andi a4, a1, 0xf
xor t0, a0, a3
xor t1, a1, a4
vld vr0, t0, 0
vld vr3, t1, 0
sub.d t2, t2, a3
vreplgr2vr.b vr4, a3
vreplgr2vr.b vr5, a4
vaddi.bu vr6, vr2, 16
vsub.b vr7, vr4, vr5
vsub.b vr6, vr6, vr7
vadd.b vr4, vr2, vr4
vshuf.b vr1, vr3, vr3, vr6
vshuf.b vr0, vr7, vr0, vr4
vshuf.b vr1, vr7, vr1, vr4
vseq.b vr4, vr0, vr1
vmin.bu vr4, vr0, vr4
bgeu t2, a2, L(un_early_end)
vsetanyeqz.b fcc0, vr4
bcnez fcc0, L(un_end)
add.d a6, a0, a2
vslt.b vr5, vr2, vr5
addi.d a7, a6, -1
vor.v vr3, vr3, vr5
bstrins.d a7, zero, 3, 0
sub.d a2, a6, a7
L(un_loop):
vld vr0, t0, 16
addi.d t0, t0, 16
vsetanyeqz.b fcc0, vr3
bcnez fcc0, L(has_zero)
beq t0, a7, L(end_with_len)
vor.v vr1, vr3, vr3
vld vr3, t1, 16
addi.d t1, t1, 16
vshuf.b vr1, vr3, vr1, vr6
vseq.b vr4, vr0, vr1
vmin.bu vr4, vr0, vr4
vsetanyeqz.b fcc0, vr4
bceqz fcc0, L(un_loop)
L(un_end):
vseqi.b vr4, vr4, 0
vfrstpi.b vr4, vr4, 0
vshuf.b vr0, vr0, vr0, vr4
vshuf.b vr1, vr1, vr1, vr4
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d t2, t0, t1
sub.d t3, t1, t0
masknez t0, t2, a5
maskeqz t1, t3, a5
or a0, t0, t1
jr ra
L(has_zero):
vshuf.b vr1, vr3, vr3, vr6
vseq.b vr4, vr0, vr1
vmin.bu vr4, vr0, vr4
bne t0, a7, L(un_end)
L(un_early_end):
vreplgr2vr.b vr5, a2
vslt.b vr5, vr2, vr5
vorn.v vr4, vr4, vr5
b L(un_end)
L(end_with_len):
sub.d a6, a3, a4
bgeu a6, a2, 1f
vld vr4, t1, 16
1:
vshuf.b vr1, vr4, vr3, vr6
vseq.b vr4, vr0, vr1
vmin.bu vr4, vr0, vr4
vreplgr2vr.b vr5, a2
vslt.b vr5, vr2, vr5
vorn.v vr4, vr4, vr5
b L(un_end)
L(ret0):
move a0, zero
jr ra
END(STRNCMP)
.section .rodata.cst16,"M",@progbits,16
.align 4
L(INDEX):
.dword 0x0706050403020100
.dword 0x0f0e0d0c0b0a0908
libc_hidden_builtin_def (STRNCMP)
#endif
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