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/* Optimized memcmp 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/regdef.h>
#include <sys/asm.h>
#if IS_IN (libc) && !defined __loongarch_soft_float
# define MEMCMP __memcmp_lasx
LEAF(MEMCMP, 6)
li.d t2, 32
add.d a3, a0, a2
add.d a4, a1, a2
bgeu t2, a2, L(less32)
li.d t1, 160
bgeu a2, t1, L(make_aligned)
L(loop32):
xvld xr0, a0, 0
xvld xr1, a1, 0
addi.d a0, a0, 32
addi.d a1, a1, 32
addi.d a2, a2, -32
xvseq.b xr2, xr0, xr1
xvsetanyeqz.b fcc0, xr2
bcnez fcc0, L(end)
L(last_bytes):
bltu t2, a2, L(loop32)
xvld xr0, a3, -32
xvld xr1, a4, -32
xvseq.b xr2, xr0, xr1
L(end):
xvmsknz.b xr2, xr2
xvpermi.q xr4, xr0, 1
xvpickve.w xr3, xr2, 4
xvpermi.q xr5, xr1, 1
vilvl.h vr2, vr3, vr2
movfr2gr.s t0, fa2
cto.w t0, t0
vreplgr2vr.b vr2, t0
vshuf.b vr0, vr4, vr0, vr2
vshuf.b vr1, vr5, vr1, vr2
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d a0, t0, t1
jr ra
L(less32):
srli.d t0, a2, 4
beqz t0, L(less16)
vld vr0, a0, 0
vld vr1, a1, 0
vld vr2, a3, -16
vld vr3, a4, -16
L(short_ret):
vseq.b vr4, vr0, vr1
vseq.b vr5, vr2, vr3
vmsknz.b vr4, vr4
vmsknz.b vr5, vr5
vilvl.h vr4, vr5, vr4
movfr2gr.s t0, fa4
cto.w t0, t0
vreplgr2vr.b vr4, t0
vshuf.b vr0, vr2, vr0, vr4
vshuf.b vr1, vr3, vr1, vr4
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d a0, t0, t1
jr ra
L(less16):
srli.d t0, a2, 3
beqz t0, L(less8)
vldrepl.d vr0, a0, 0
vldrepl.d vr1, a1, 0
vldrepl.d vr2, a3, -8
vldrepl.d vr3, a4, -8
b L(short_ret)
nop
L(less8):
srli.d t0, a2, 2
beqz t0, L(less4)
vldrepl.w vr0, a0, 0
vldrepl.w vr1, a1, 0
vldrepl.w vr2, a3, -4
vldrepl.w vr3, a4, -4
b L(short_ret)
nop
L(less4):
srli.d t0, a2, 1
beqz t0, L(less2)
vldrepl.h vr0, a0, 0
vldrepl.h vr1, a1, 0
vldrepl.h vr2, a3, -2
vldrepl.h vr3, a4, -2
b L(short_ret)
nop
L(less2):
beqz a2, L(ret0)
ld.bu t0, a0, 0
ld.bu t1, a1, 0
sub.d a0, t0, t1
jr ra
L(ret0):
move a0, zero
jr ra
L(make_aligned):
xvld xr0, a0, 0
xvld xr1, a1, 0
xvseq.b xr2, xr0, xr1
xvsetanyeqz.b fcc0, xr2
bcnez fcc0, L(end)
andi t0, a0, 0x1f
sub.d t0, t2, t0
sub.d t1, a2, t0
add.d a0, a0, t0
add.d a1, a1, t0
andi a2, t1, 0x3f
sub.d t0, t1, a2
add.d a5, a0, t0
L(loop_align):
xvld xr0, a0, 0
xvld xr1, a1, 0
xvld xr2, a0, 32
xvld xr3, a1, 32
xvseq.b xr0, xr0, xr1
xvseq.b xr1, xr2, xr3
xvmin.bu xr2, xr1, xr0
xvsetanyeqz.b fcc0, xr2
bcnez fcc0, L(pair_end)
addi.d a0, a0, 64
addi.d a1, a1, 64
bne a0, a5, L(loop_align)
bnez a2, L(last_bytes)
move a0, zero
jr ra
nop
L(pair_end):
xvmsknz.b xr0, xr0
xvmsknz.b xr1, xr1
xvpickve.w xr2, xr0, 4
xvpickve.w xr3, xr1, 4
vilvl.h vr0, vr2, vr0
vilvl.h vr1, vr3, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
cto.d t0, t0
ldx.bu t1, a0, t0
ldx.bu t2, a1, t0
sub.d a0, t1, t2
jr ra
END(MEMCMP)
libc_hidden_builtin_def (MEMCMP)
#endif
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