From: "Rémi Denis-Courmont" <remi@remlab.net>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 6/6] lavc/ac3dsp: RISC-V B ac3_extract_exponents
Date: Thu, 15 Jun 2023 22:18:27 +0300
Message-ID: <3766564.7GmiqfnTM5@basile.remlab.net> (raw)
In-Reply-To: <20230615103645.25778-7-shenpeiting@eswincomputing.com>
Le torstaina 15. kesäkuuta 2023, 13.36.45 EEST Peiting Shen a écrit :
> From: Shen Peiting <shenpeiting@eswincomputing.com>
>
> Use RVB instruction clz to calculate the number of leading zeros of MSB
> instead of av_log2.
>
> Benchmarks on Spike(cycles):
> ac3_extract_exponents_c: 8226
> ac3_extract_exponents_rvb: 1167
FWIW, RV-Zbb can be benchmarked on real hardware.
I would have done it already if only there was a checkasm case for this.
--
Rémi Denis-Courmont
http://www.remlab.net/
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next prev parent reply other threads:[~2023-06-15 19:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-15 10:36 [FFmpeg-devel] [PATCH 0/6] RISC-V initial ac3dsp Peiting Shen
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 1/6] lavc/ac3dsp: RISC-V V ac3_exponent_min Peiting Shen
2023-06-15 18:02 ` Rémi Denis-Courmont
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 2/6] lavc/ac3dsp: RISC-V V float_to_fixed24 Peiting Shen
2023-06-15 18:06 ` Rémi Denis-Courmont
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 3/6] lavc/ac3dsp: RISC-V V ac3_sum_square_butterfly_int32 Peiting Shen
2023-06-15 19:25 ` Rémi Denis-Courmont
2023-06-16 10:15 ` 沈佩婷
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 4/6] lavc/ac3dsp: RISC-V V ac3_sum_square_butterfly_float Peiting Shen
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 5/6] lavc/ac3dsp: RISC-V V ac3_compute_mantissa_size Peiting Shen
2023-06-15 10:36 ` [FFmpeg-devel] [PATCH 6/6] lavc/ac3dsp: RISC-V B ac3_extract_exponents Peiting Shen
2023-06-15 19:18 ` Rémi Denis-Courmont [this message]
2023-06-15 13:57 ` [FFmpeg-devel] [PATCH 0/6] RISC-V initial ac3dsp Lynne
2023-06-15 19:10 ` Rémi Denis-Courmont
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