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/*
* Copyright © 2022 Rémi Denis-Courmont.
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/riscv/asm.S"
func ff_opus_postfilter_rvv, zve32f, zbb
flw fa0, 0(a2) // g0
slli t1, a1, 2
flw fa1, 4(a2) // g1
sub t0, a0, t1
flw fa2, 8(a2) // g2
addi t1, t0, -2 * 4 // data - (period + 2) = initial &x4
vsetivli zero, 4, e32, m4, ta, ma
addi t0, t0, 2 * 4 // data - (period - 2) = initial &x0
vle32.v v16, (t1)
addi t3, a1, -2 // maximum parallelism w/o stepping our tail
1:
vslidedown.vi v8, v16, 2
min t1, a3, t3
vslide1down.vx v12, v16, zero
vsetvli t1, t1, e32, m4, ta, ma
vle32.v v0, (t0) // x0
sub a3, a3, t1
vslide1down.vx v4, v8, zero
sh2add t0, t1, t0
vle32.v v28, (a0)
addi t2, t1, -4
vslideup.vi v4, v0, 1
vslideup.vi v8, v4, 1
vslideup.vi v12, v8, 1
vslideup.vi v16, v12, 1
vfadd.vv v20, v4, v12
vfadd.vv v24, v0, v16
vslidedown.vx v16, v0, t2
vfmacc.vf v28, fa0, v8
vfmacc.vf v28, fa1, v20
vfmacc.vf v28, fa2, v24
vse32.v v28, (a0)
sh2add a0, t1, a0
bnez a3, 1b
ret
endfunc
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