alt.hn

4/11/2026 at 9:03:34 AM

Mark's Magic Multiply

https://wren.wtf/shower-thoughts/marks-magic-multiply/

by luu

4/12/2026 at 9:27:18 PM

Link to Mark Owen’s excellent QFP library for soft float on Cortex-M0+ (ARMv6-M) and Cortex-M3/M4 (ARMv7-M).

https://www.quinapalus.com/qfplib.html

Nice write up here, too, I like the idea of a firm float.

by awjlogan

4/13/2026 at 5:57:28 AM

Since the trick works on mantissa only without hidden 1 included, I wonder if that number of bits in mantissa was chosen because of it

by NooneAtAll3

4/13/2026 at 12:38:02 AM

I appreciate this warning near the top: This post contains floating point. Floating point is known to the State of California to cause confusion and a fear response in mammalian bipeds.

I wisely hit the back button :)

by mysterydip

4/13/2026 at 3:51:00 AM

I saw an explanation (perhaps Fabien's) which made it click - floating point is just segment:offset addressing for numbers!

Then the full horror of it hit me.

by bombcar