mirror of https://git.ffmpeg.org/ffmpeg.git
89 lines
2.8 KiB
ArmAsm
89 lines
2.8 KiB
ArmAsm
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/*
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* Copyright © 2023 Rémi Denis-Courmont.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/riscv/asm.S"
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#if __riscv_xlen >= 64
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func ff_lpc_apply_welch_window_rvv, zve64d
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vsetvli t0, zero, e64, m8, ta, ma
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vid.v v0
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addi t2, a1, -1
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vfcvt.f.xu.v v0, v0
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li t3, 2
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fcvt.d.l ft2, t2
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srai t1, a1, 1
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fcvt.d.l ft3, t3
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li t4, 1
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fdiv.d ft0, ft3, ft2 # ft0 = c = 2. / (len - 1)
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fcvt.d.l fa1, t4 # fa1 = 1.
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fsub.d ft1, ft0, fa1
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vfrsub.vf v0, v0, ft1 # v0[i] = c - i - 1.
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1:
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vsetvli t0, t1, e64, m8, ta, ma
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vfmul.vv v16, v0, v0 # no fused multipy-add as v0 is reused
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sub t1, t1, t0
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vle32.v v8, (a0)
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fcvt.d.l ft2, t0
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vfrsub.vf v16, v16, fa1 # v16 = 1. - w * w
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sh2add a0, t0, a0
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vsetvli zero, zero, e32, m4, ta, ma
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vfwcvt.f.x.v v24, v8
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vsetvli zero, zero, e64, m8, ta, ma
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vfsub.vf v0, v0, ft2 # v0 -= vl
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vfmul.vv v8, v24, v16
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vse64.v v8, (a2)
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sh3add a2, t0, a2
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bnez t1, 1b
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andi t1, a1, 1
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beqz t1, 2f
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sd zero, (a2)
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addi a0, a0, 4
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addi a2, a2, 8
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2:
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vsetvli t0, zero, e64, m8, ta, ma
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vid.v v0
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srai t1, a1, 1
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vfcvt.f.xu.v v0, v0
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fcvt.d.l ft1, t1
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fsub.d ft1, ft0, ft1 # ft1 = c - (len / 2)
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vfadd.vf v0, v0, ft1 # v0[i] = c - (len / 2) + i
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3:
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vsetvli t0, t1, e64, m8, ta, ma
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vfmul.vv v16, v0, v0
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sub t1, t1, t0
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vle32.v v8, (a0)
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fcvt.d.l ft2, t0
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vfrsub.vf v16, v16, fa1 # v16 = 1. - w * w
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sh2add a0, t0, a0
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vsetvli zero, zero, e32, m4, ta, ma
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vfwcvt.f.x.v v24, v8
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vsetvli zero, zero, e64, m8, ta, ma
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vfadd.vf v0, v0, ft2 # v0 += vl
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vfmul.vv v8, v24, v16
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vse64.v v8, (a2)
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sh3add a2, t0, a2
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bnez t1, 3b
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ret
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endfunc
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#endif
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