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jaygreco 16 hours ago [-]
Love these deep dives. It’s fascinating to see how real, low-level engineering we all take for granted today unfolded. It’s incredible that the rough equivalent of an entire 160lb digital computer was built and baked into silicon.
Also incredible reverse engineering. In a time when seemingly all appreciation for expertise is gone it’s so refreshing to see.
cmovq 12 hours ago [-]
Always thought it was strange that fptan also pushes 1 to the register stack. It now makes sense it’s so existing code for the 8087 which was expected to do y/x to get the actual tangent could keep working by doing y/1 on newer processors.
kens 20 hours ago [-]
Author here for your 8087 questions...
WalterBright 14 hours ago [-]
Thank you! Amazing work! I've always had a soft spot for the 8087.
Maybe implement the algorithm in C? Thank would be fun!
jacquesm 12 hours ago [-]
Weitek next?
kens 11 hours ago [-]
The 8087 is probably enough floating point for a while :-)
jacquesm 6 hours ago [-]
That's an interesting chip though, but probably also much more challenging.
Const-me 5 hours ago [-]
I remember I once wanted to compute tangent of fp64 vectors. Here’s what I did.
Also incredible reverse engineering. In a time when seemingly all appreciation for expertise is gone it’s so refreshing to see.
Maybe implement the algorithm in C? Thank would be fun!
https://github.com/Const-me/AvxMath/blob/master/AvxMath/AvxM...