[Rd] Floating point issue

GILLIBERT, Andre Andre@G||||bert @end|ng |rom chu-rouen@|r
Mon Jul 11 13:48:51 CEST 2022

> From my current experiences, I dare to say that the M1 with all
> its speed is just a tad less reliable numerically than the
> Intel/AMD floating point implementations..

80 bits floating point (FP) numbers are great, but I think we cannot rely on it for the future.
I expect, the marketshare of ARM CPUs to grow. It's hard to predict, but ARM may spread in desktop computers in a timeframe of 10 years, and I would not expect it to gain extended precision FP.
Moreover, performance of FP80 is not a priority of Intel. FP80 in recent Intel microprocessors are very slow when using special representations (NaN, NA, Inf, -Inf) or denormal numbers.

Therefore, it may be wise to update R algorithms to make them work quite well with 64 bits FP.


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