Algorithms for trig. on scientific calculators ?

[brouhaha]

(12-05-2024 06:24 PM)Commie Wrote:  Here is an example of how calculators calculate sine, using the Pade algorithm.

Which calculator models use the Padé approximant? While I've heard of this method, I've never before heard of it bring used in a calculator. I would have expected the Padé approximant to require too many terms to get the required accuracy for sin over e.g. the domain [0, pi/4].

Computers with high-performance floating point hardware do typically use polynomial or rational approximations, rather than CORDIC. Of course, now even some microcontrollers have high-performance binary IEEE floating point hardware, including some STM32 variants found in some recent Swiss Micros calculators, though AFAIK those calculators do not use binary IEEE floating point.