[FFmpeg-devel] [PATCH] af_afir: RISC-V V fcmul_add

[Rémi Denis-Courmont]

Le keskiviikkona 15. marraskuuta 2023, 10.59.55 EET flow gg a écrit :
> Okay, I have updated these issues in the patch.

It does not assemble but I can fix it locally. The narrowing shift trickery 
require Zve64x, or rather Zve64f in this case.

The performance improvement is much better on newer hardware:
fcmul_add_c: 4891.2
fcmul_add_rvv_f64: 2399.5

FWIW, VLSEG2E32.V remains slightly worse than with shifting:
fcmul_add_c: 4891.2
fcmul_add_rvv_f32: 2877.5

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雷米‧德尼-库尔蒙
http://www.remlab.net/