Re: Modern compilers for ye olde architectures

Am 06.10.21 um 09:56 schrieb Anton Ertl:
> So eventually computer architects introduced machines with
> general-purpose registers like the PDP-11, the VAX, and the RISCs; and
> compiler writers developed techniques like graph colouring to make
> good use of these architectures.
>
> Maybe with the increased memory and processing power available now,
> one could do better, but given that special-purpose registers are
> mostly a thing of the past, there has not been much research into
> that, that I am aware of.


See "Optimal Register Allocation in Polynomial Time". A graph-coloring
approach that can handle irregularities well (as long as there are not
too many registers). SDCC uses such a register allocator for some
backends, including z80.


Philipp

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