On Wed, 22 Apr 2020 15:05:48 +0800 Turritopsis Dohrnii Teo En Ming <c...@teo-en-ming.com> wrote:
> > The original 1988 ARM and many generations since did not have > > floating point hardware. It's only when multiple cores became > > popular that it became worth doing. Floating point hardware was > > always a separate core, (the 80486 was an 80386 plus an 80387 in > > the same package) using microprogramming to provide the functions. > > The RISC ARM doesn't do the CISC/microprogram thing, so a single > > processor would spend the same amount of time carrying out the > > calculations whether they were a formal FP instruction set or not, > > and the whole point of the ARM is that it is smaller and simpler > > than a CISC processor. > > A bit difficult for me to understand :) > > Not important, just about a bit of history about why ARMs didn't have floating point hardware until recently. If it was a new design, all ARMs would be armhf type. -- Joe
