| /* |
| * 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 |
