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From: Dennis <dennis@none.none>
Newsgroups: sci.electronics.design
Subject: Re: Raspberry Pi pico2 launches with an ARM and a Risc V processor
 core
Date: Sun, 11 Aug 2024 18:11:00 -0500
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On 8/11/24 14:34, Dave Platt wrote:

> 
> The 2350 uses an M33 processor core, which has a single-precision
> hardware floating-point unit.
> 

For double they have an assist co-processor that speeds up parts of the 
operations with multiple instructions to do the operation.By using the 
assist processor for the core function they can significantly reduce the 
hardware while still getting a speed up since the rest of the code to 
implement the function needs fewer instructions than a full software 
implementation.

See section 3.6.2
https://datasheets.raspberrypi.com/rp2350/rp2350-datasheet.pdf