Mark's Magic Multiply

lluu 2 days ago 4 commentsRead Article on wren.wtf

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Discussion (4 Comments)Read Original on HackerNews

awjlogan•about 15 hours ago

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.

NooneAtAll3•about 6 hours ago

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

mysterydip•about 12 hours ago

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 :)

bombcar•about 8 hours ago

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.