[FFmpeg-devel] [PATCH 1/2] lavc/aacpsdsp: rework RISC-V add_squares
Rémi Denis-Courmont
remi at remlab.net
Sun Jul 16 17:34:47 EEST 2023
Le lauantaina 15. heinäkuuta 2023, 23.57.04 EEST Rémi Denis-Courmont a écrit :
> Segmented loads are kinda slow, so this advantageously uses a
> unit-strided load and narrowing shifts instead.
>
> Before:
> ps_add_squares_rvv_f32: 30352.2
>
> After:
> ps_add_squares_rvv_f32: 11973.7
> ---
> libavcodec/riscv/aacpsdsp_rvv.S | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/libavcodec/riscv/aacpsdsp_rvv.S
> b/libavcodec/riscv/aacpsdsp_rvv.S index 80bd19f6ad..b7ea314fc3 100644
> --- a/libavcodec/riscv/aacpsdsp_rvv.S
> +++ b/libavcodec/riscv/aacpsdsp_rvv.S
> @@ -1,5 +1,5 @@
> /*
> - * Copyright © 2022 Rémi Denis-Courmont.
> + * Copyright © 2022-2023 Rémi Denis-Courmont.
> *
> * This file is part of FFmpeg.
> *
> @@ -21,13 +21,16 @@
> #include "libavutil/riscv/asm.S"
>
> func ff_ps_add_squares_rvv, zve32f
> + li t1, 32
> 1:
> vsetvli t0, a2, e32, m1, ta, ma
> - vlseg2e32.v v24, (a1)
> - sub a2, a2, t0
> + vle64.v v8, (a1)
Requires zve64x
> + vnsrl.wx v24, v8, zero
> vle32.v v16, (a0)
> - sh3add a1, t0, a1
> + sub a2, a2, t0
> + vnsrl.wx v25, v8, t1
> vfmacc.vv v16, v24, v24
> + sh3add a1, t0, a1
> vfmacc.vv v16, v25, v25
> vse32.v v16, (a0)
> sh2add a0, t0, a0
--
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