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devel / comp.lang.c / Fast subnormal arithmetics

SubjectAuthor
* Fast subnormal arithmeticsStefan Ram
`- Re: Fast subnormal arithmeticsBonita Montero

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Fast subnormal arithmetics

<fast-20220910133020@ram.dialup.fu-berlin.de>

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https://www.novabbs.com/devel/article-flat.php?id=23046&group=comp.lang.c++#23046

  copy link   Newsgroups: comp.lang.c
 by: Stefan Ram - Sat, 10 Sep 2022 12:30 UTC

An arithmetic bug in some Python libraries might be related
to C. The "fast" optimization options of some common compilers
might lead to calculation errors, when subnormal numbers are
involved. (Maybe this is even documented, but not everybody
is always aware of it.) A library will then be used that
sets the processor's FTZ/DAZ flag, and from then on, subnormals
will be treated as zero.

Blog post "Someone's Been Messing With My Subnormals!"
by Dolan-Gavitt.

Re: Fast subnormal arithmetics

<tfjuam$1r950$1@dont-email.me>

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https://www.novabbs.com/devel/article-flat.php?id=23058&group=comp.lang.c++#23058

  copy link   Newsgroups: comp.lang.c
 by: Bonita Montero - Sun, 11 Sep 2022 06:13 UTC

Am 10.09.2022 um 14:30 schrieb Stefan Ram:
> An arithmetic bug in some Python libraries might be related
> to C. The "fast" optimization options of some common compilers
> might lead to calculation errors, when subnormal numbers are
> involved. (Maybe this is even documented, but not everybody
> is always aware of it.) A library will then be used that
> sets the processor's FTZ/DAZ flag, and from then on, subnormals
> will be treated as zero.
>
> Blog post "Someone's Been Messing With My Subnormals!"
> by Dolan-Gavitt.
>
>

It doesn't matter how FTZ or DAZ are set.

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