A not so fast implementation of cosine similarity in C++ and SIMD

Re:A not so fast implementation of cosine similarity in C++ ... by QuadmasterXLII on Tuesday October 15, 2024 @08:14PM (#41854399)

I feel like I’m kinda being the bad aunt by encouraging -ffast-math. It can definitely break some things (i.e. https://pspdfkit.com/blog/2021/understanding-fast-math/ ) but I use it habitually and I’m fine so clearly it’s safe.

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Re:A not so fast implementation of cosine similarity in C++ ... by magicalhippo on Tuesday October 15, 2024 @09:11PM (#41854704)

> It can definitely break some things

I recall it totally fudged up the ray-axis aligned bounding box intersection routine in the raytracer I worked on. The routine relied on infinities being handled correctly, and -ffast-math broke that.

I see the linked article goes into that aspect in detail, wish I had it back then.

IIRC we ended up disabling it for just that file, as it did speed up the rest my a fair bit.

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Re:A not so fast implementation of cosine similarity in C++ ... by hansvm on Wednesday October 16, 2024 @10:05AM (#41859169)

I would love a fast-math implementation which handled inf correctly, but no language/compiler seems to care.

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