From: "Tomas Härdin" <tjoppen@acc.umu.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v2 2/7] avutil/half2float: adjust conversion of NaN
Date: Thu, 18 Aug 2022 10:51:04 +0200
Message-ID: <f67bc4543673e0e4e006dc1b67783178a37d7099.camel@acc.umu.se> (raw)
In-Reply-To: <20220814164833.19965-2-timo@rothenpieler.org>
sön 2022-08-14 klockan 18:48 +0200 skrev Timo Rothenpieler:
> IEEE-754 differentiates two different kind of NaNs.
> Quiet and Signaling ones. They are differentiated by the MSB of the
> mantissa.
>
> For whatever reason, actual hardware conversion of half to single
> always
> sets the signaling bit to 1 if the mantissa is != 0, and to 0 if it's
> 0.
> So our code has to follow suite or fate-testing hardware float16 will
> be
> impossible.
Does IEEE-754 specify this behavior?
/Tomas
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next prev parent reply other threads:[~2022-08-18 8:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-14 16:48 [FFmpeg-devel] [PATCH v2 1/7] avutil: move half-precision float helper to avutil Timo Rothenpieler
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 2/7] avutil/half2float: adjust conversion of NaN Timo Rothenpieler
2022-08-18 8:51 ` Tomas Härdin [this message]
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 3/7] avutil/half2float: move tables to header-internal structs Timo Rothenpieler
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 4/7] avutil/half2float: move non-inline init code out of header Timo Rothenpieler
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 5/7] avutil/half2float: use native _Float16 if available Timo Rothenpieler
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 6/7] swscale: add opaque parameter to input functions Timo Rothenpieler
2022-08-14 16:48 ` [FFmpeg-devel] [PATCH v2 7/7] swscale/input: add rgbaf16 input support Timo Rothenpieler
2022-08-14 23:15 ` Leo Izen
2022-08-15 4:15 ` Andreas Rheinhardt
2022-08-18 15:37 ` [FFmpeg-devel] [PATCH v2 1/7] avutil: move half-precision float helper to avutil Timo Rothenpieler
2022-08-19 21:21 ` Timo Rothenpieler
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